ball valve manufacturer Archives

Pneumatic ball valve-with high platform vs with bracket

June 9, 2021

The difference between pneumatic high platform ball valve and pneumatic ball valve with bracket
Pneumatic ball valve is one of the most widely used valve types in recent years. It is not only convenient in operation, but also very fast in execution. It is used in a variety of fields, such as petroleum, chemical, power generation, paper, food, and pharmaceutical industries. And in people’s daily lives. By connecting the air source, solenoid valve control, and related accessories, the pipeline can be quickly opened or closed, and it can also be intelligently controlled to achieve the adjustment of various process parameters such as pipeline media!

Schematic diagram of high platform ball valve

There are many types of pneumatic ball valves, which can be divided into various models according to pressure, material, connection form, applied medium, including control form. Today we will analyze the difference and choice between the pneumatic high platform ball valve and the ordinary pneumatic ball valve with bracket!
Description and advantages and disadvantages of pneumatic high platform ball valve:
Pneumatic high platform ball valve, as the name implies, is that the ball valve adopts a high platform design. The ISO standard is commonly used. The purpose of this is to facilitate the installation of the drive device. The connecting plate can be directly installed and connected with the (electric/pneumatic) actuator without a bracket. And connecting shaft. It can save costs by avoiding the bracket, improve production efficiency, and greatly improve the stability between the valve and the actuator, and the performance is very stable in use, so the application of the overall valve will not be affected by the looseness of the bracket or the large coupling gap. To
The advantage of pneumatic high platform ball valve is that its shape is more beautiful than ordinary ball valve, more refined, beautiful and generous, it takes up less space, and the structure is more compact. The disadvantage is that it is not resistant to high temperature, and the temperature is transmitted to the cylinder. The rubber ring in the cylinder is easy to age, and it is generally applicable. In the pipeline where the medium temperature is below 80 degrees. To
Description and advantages and disadvantages of pneumatic ball valve with bracket:
The use and function of the pneumatic bracket ball valve and the high platform ball valve are the same. The difference is that between the pneumatic bracket ball valve actuator and the ball valve body, there is a bracket supported, usually high medium temperature needs to be equipped with a bracket , This can avoid damage to the actuator due to high temperature. In layman’s terms, the ultimate purpose of the bracket is to extend the service life of the valve. The advantage of the pneumatic ball valve with bracket is that the heat dissipation function is relatively strong. For example, the medium temperature of the pipeline is above 300 degrees. At this time, it is recommended that the valve stem of the pneumatic ball valve should be correspondingly lengthened and the bracket should be attached at the same time. The reason for the extension of the valve stem with the bracket is to separate the valve body of the ball valve from the actuator, so as to prevent the medium temperature of the ball valve body from being too high, thereby affecting the service life of the actuator. For example, when the valve body of a ball valve is immersed in a liquid medium, and the liquid medium is strongly corrosive, the operator cannot approach it, and the actuator is outside the liquid surface, and the actuator needs to be operated by the staff. In this case It is necessary to choose a ball valve with a longer stem and a bracket, and if the liquid is strongly corrosive, the material of the ball valve must also be standard stainless steel, so as to ensure the normal operation of the pneumatic ball valve.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Properties of Fixed ball valve

May 31, 2021

The fixed ball valve is a new generation of high-performance ball valve, suitable for long-distance pipelines and general industrial pipelines. Its strength, safety, and harsh environment resistance have been specially considered in the design, and it is suitable for various corrosive and non-corrosive media. . Compared with the floating ball valve, when working, the force generated by the fluid pressure in front of the valve on the ball is all transmitted to the bearing, and the ball will not move to the valve seat, so the valve seat will not bear excessive pressure, so the fixed ball valve The torque is small, the deformation of the valve seat is small, the sealing performance is stable, and the service life is long. It is suitable for high pressure and large diameter occasions. The fixed ball valve has two-piece and three-piece valve body structures. The middle flange is connected by bolts, and the seal adopts reinforced PTFE embedded in the stainless steel ring. The rear of the steel ring is equipped with a spring to ensure that the valve seat is tightly attached to the ball. Keep it sealed.

fixed ball valve

The fixed ball valve is a new generation of high-performance ball valve, suitable for long-distance pipelines and general industrial pipelines. Its strength, safety, and harsh environment resistance have been specially considered in the design, and it is suitable for various corrosive and non-corrosive media. . Compared with the floating ball valve, when working, the force generated by the fluid pressure in front of the valve on the ball is all transmitted to the bearing, and the ball will not move to the valve seat, so the valve seat will not bear excessive pressure, so the fixed ball valve The torque is small, the deformation of the valve seat is small, the sealing performance is stable, and the service life is long. It is suitable for high pressure and large diameter occasions. The advanced spring pre-valve seat assembly has self-tightening characteristics to achieve upstream sealing. Each valve has two valve seats, which can be sealed in each direction, so the installation has no flow direction restriction and is two-way. This valve is generally installed horizontally.

The fixed ball valve has two-piece and three-piece valve body structures. The middle flange is connected by bolts, and the seal adopts reinforced PTFE embedded in the stainless steel ring. The rear of the steel ring is equipped with a spring to ensure that the valve seat is tightly attached to the ball. Keep it sealed. Both the upper and lower valve stems are equipped with PTFE bearings to reduce friction and save labor. The bottom of the small shaft is equipped with an adjustment plate to ensure the joint position of the ball and the sealing ring. Full bore diameter: The flow aperture of the valve is the same as the inner diameter of the pipeline to facilitate the pipeline cleaning.

Product features of fixed ball valve:

Operational reliability

The relative linkage (seat and stem bearing) of the large-diameter ball valve adopts Teflon with a small friction coefficient, so the operating torque is small. In addition, the long-term lubrication of the sealing grease makes the operation more flexible.

Valve seat structure

There are two types of valve seat structures: single-seal and double-seal structures. Generally, the one with self-relief function is single-seal, and double-seal is the additional safety relief on the valve body.

Lengthened stem

The extension of the valve stem is suitable for buried and low-temperature use. The length of the extension is determined according to the needs. The operation modes include manual, pneumatic, electric, gas-liquid linkage, etc.

Security of external forces

The wall thickness of the valve body is designed in accordance with the safety regulations of the high-pressure vessel, and meets the requirements of API6D for withstanding external force and bending resistance, and has sufficient strength.

As shown in the figure, the sealing of the gland part adopts four O-rings and a sealing grease injection device.

Performance advantages of fixed ball valves

Labor-saving operation: The ball is supported by the upper and lower bearings to reduce friction and eliminate the excessive torque caused by the huge sealing load formed by the imported pressure pushing the ball and the sealing seat.
Reliable sealing performance: PTFE material sealing ring is embedded in the stainless steel valve seat, and the end of the metal valve seat is equipped with a spring to ensure sufficient pre-tightening force of the sealing ring. When the sealing surface of the valve wears during use, it will be under the action of the spring. The valve continues to ensure good sealing performance.
Fireproof structure: In order to prevent the PTFE seal ring from being burnt due to sudden heat or fire, and large leakage occurs, which encourages the fire, a fireproof seal ring is set between the ball and the valve seat. When the seal ring is burned, Under the action of the spring force, the valve seat sealing ring is quickly pushed to the ball to form a metal-to-metal seal, which has a certain degree of sealing effect. The fire resistance test meets the requirements of AP16FA and API607 standards.
Automatic pressure relief function: When the pressure of the stagnant medium in the valve cavity rises abnormally and exceeds the pre-load of the spring, the valve seat retreats from the sphere to achieve the effect of automatic pressure relief. The valve seat automatically recovers after pressure relief.
Drainage pipeline: Drain holes are set up and down the valve body to check whether the valve seat is leaking. During work, when the valve is fully open or fully closed, the pressure in the middle cavity can be removed, and the packing can be directly replaced; the middle cavity can be discharged. Retentate, reduce the pollution of the medium to the valve.

Main features of fixed ball valve:

advantages of fixed ball valve:

Double blocking and discharge function: the fixed ball valve adopts spring pre-tensioned floating seat, no matter the valve is in the fully open or fully closed state, the upstream and downstream valve seats block the fluid, and the retentate in the valve body is discharged through the discharge valve. .
Automatic pressure relief function: When the temperature of the medium in the valve body cavity increases and causes abnormal pressure rise, it does not need to pass through the safety valve, but the valve seat function can automatically relieve the pressure, which is to ensure the safety of the valve when transporting liquid media. Sex is very important.
Fire safety structure: All valves have fire safety functions, and their design and manufacturing follow the requirements of API 607 and API 6FA.

Disadvantage of fixed ball valve:

Sealing emergency grease injection rescue: due to foreign matter in the medium or fire causing the valve seat seal to fail unexpectedly, the grease injection valve provides a quick connection with the grease injection gun, and the imported pump can easily and quickly inject the sealing grease into the valve seat sealing part. Mitigating leakage.
Reliable valve stem sealing and low operating torque: In addition to the standard sealing ring, an O-ring seal is also set on the packing gland. The double seal ensures the reliability of the valve stem seal; additional graphite packing and sealing grease Injection minimizes valve stem leakage after a fire. The valve stem sliding bearing and thrust bearing make the valve easy to operate.
Full diameter or reduced diameter: Full diameter or reduced diameter structure can be selected according to needs. The flow aperture of the full-bore valve is the same as the inner diameter of the pipeline, which is convenient for pipeline cleaning.
The valve stem can be lengthened: According to the needs of installation or operation, the valve stem can be lengthened. The extended stem ball valve is especially suitable for occasions where pipelines need to be buried in the ground, such as city gas. The size of the lengthened stem is determined according to customer needs.
Flexible operation: The valve seat and stem bearing with small friction coefficient and good self-lubricating property are adopted, which greatly reduces the operating torque of the valve. Therefore, even in the absence of sealing grease, the valve can be operated flexibly for a long time.

Application range of fixed ball valve:

The fixed ball valve is suitable for various pipelines of Class150～Class1500, PN16～PN100, JIS 10K～JIS 20K, applicable temperature: -196～350℃, used to cut off or connect the medium in the pipeline. Different materials can be selected. They are suitable for transporting water, steam, oil, nitric acid, acetic acid, oxidizing media, urea, etc., and are widely used in petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electric power, municipal administration, steel and other fields. The driving mode of the fixed ball valve is worm gear drive, manual, pneumatic or electric. The fixed ball valve generally adopts flange connection, but also can adopt butt welding connection.

Related types of valves:

We can also produce gate valve, check valve, globe valve, knife gate valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D,

The difference between fixed ball valve and floating ball valve

May 28, 2021

There are many types of ball valves, such as hard-sealed ball valves, soft-sealed ball valves, welded half-ball valves, V-shaped ball valves, flanged ball valves, wafer ball valves, fixed ball valves, and floating ball valves. These classifications are based on the actual use of the manufacturer and the actual situation of the customer. Need, it is slowly researched and developed, but no matter how it develops, it is inseparable from the design principle of the ball valve. The so-called new product of the ball valve, no matter what kind of ball valve is developed, the principle and design plan are designed around the main body of the ball valve. The principles and standards come.
Here, we mainly talk about fixed ball valves and floating ball valves.

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The more intuitive difference between the fixed ball valve and the floating ball valve is that the fixed ball valve is located at the lower end of the valve, and there is a stem supporting hole corresponding to the upper stem. The upper and lower stems firmly fix the spool of the ball valve to make the spool of this valve. Can not roll at will. The sealing principle is that the valve seats on both sides are pressed against the fixed ball core in the middle, so that the valve has a sealing function.
The soft sealing ball valve is round at the lower end of the valve without opening. The ball core is only fixed unilaterally by the upper stem. The ball core can move freely inside the valve cavity. When sealing, the valve seats on both sides of the ball valve are fixed. The valve seat is pressed by the valve core to produce a sealing effect.
Generally speaking, fixed ball valves are suitable for large diameters and high pressure ball valves when the pressure is relatively high. The soft-sealed ball valve is suitable for small caliber, and is suitable for low-pressure sealing ball valve when the pressure is relatively low.
The main feature of the floating ball valve is that the ball has no supporting shaft. The ball is supported by the valve seats at the inlet and outlet ends of the valve. The valve stem and the ball are movably connected. The ball of this ball valve is held in a “floating state” by two valve seats.

The ball can freely rotate between the two valve seats through the valve stem by means of a handle or other driving device.

When the flow channel hole of the ball is aligned with the valve channel hole, the ball valve is in an open state, the fluid is unblocked, and the fluid resistance of the valve is small. When the ball is rotated by 90°C, the flow channel hole of the ball is perpendicular to the valve channel hole, and the ball valve is in a closed state. Under the action of fluid pressure, the ball is pushed to the valve seat at the outlet end of the valve (referred to as the back of the valve) to make it press Tighten and ensure sealing.

Features of floating ball valve:
Under the action of the pressure difference, the ball will move slightly downstream of the valve;
The sealing performance of the ball valve mainly depends on its downstream valve seat;
The valve seat cannot move between the ball and the valve body.

Features of fixed ball valve:

The ball of the fixed ball valve is connected with the upper and lower stems as a whole, or made into an integral connecting ball, that is, the ball is forged (welded) with the upper and lower stems and mounted on the bearing. The ball can be aligned with the valve channel. The vertical axis rotates freely, but cannot move along the channel axis.

Therefore, when the fixed ball valve is working, all the force generated by the fluid pressure in front of the valve on the ball is transmitted to the bearing, and the ball will not move to the rear valve seat, so the valve seat will not bear excessive pressure, so the fixed ball valve The torque is small, the deformation of the valve seat is small, the sealing performance is stable, and the service life is long. It is suitable for high pressure and large diameter occasions.
Function of fixed ball valve
The function of preventing the valve stem from blowing out
Double cut and bleed (DBB) function
Safety function (fire protection function)
The function of injecting sealing grease when the valve leaks
Piston effect of ball valve seat (two-way piston effect of G series ball valve)
The purpose of the two-way piston effect: automatically release the pressure in the cavity of the valve body.
The use of the one-way piston effect: After the upstream valve seat is damaged, the fluid flows into the middle cavity, and the pressure in the middle cavity is higher than the pressure downstream of the valve.
Floating ball valve design should focus on the medium load to be considered in the material of the sealing ring. Excessive medium pressure will affect the life of the valve seat, and the ball can only have a slight offset. Therefore, the floating ball valve is generally suitable for DN200 or below DN200. The ball of the fixed ball valve whose nominal pressure does not exceed CLASS600Lb (10.0MPa) is fixed in the middle of the valve body by the upper and lower stems, and will not move after being pressed. The sealing of the fixed ball valve is to ensure the sealing by providing sufficient pre-tightening force through the leaf spring or cylindrical compression spring on the sealing valve seat, which is a double-sided forced sealing. The ball is supported by the upper and lower bearings, reducing friction, eliminating the excessive torque caused by the huge sealing load formed by the imported pressure pushing the ball and the sealing seat, and the operation is labor-saving. The fixed ball valve is double-sided and sealed on both sides, which will form a sealed cavity between the two sealed valve seats. To avoid danger, the fixed ball valve must be designed with an automatic pressure relief function, that is, when the pressure of the stagnant medium in the valve cavity increases abnormally and exceeds the spring At the time of pre-force, the valve seat retreats away from the sphere to achieve the effect of automatic pressure relief. After pressure relief, the valve seat automatically recovers. The fixed ball valve is widely applicable to various process pipelines with large diameter and high pressure due to its structural characteristics. Due to the need to assemble the upper and lower stems, only ball valves with a nominal diameter of DN50 or above can be produced. The nominal diameter is too small to be assembled.

Structure of fixed ball valve
1). Sphere
After introducing the various structural forms of the seal seat, I came to observe the ball structure of the same ball valve. The most important feature of the Tongding ball valve is that the ball does not deviate from the center of the sphere during the process of storing and opening. The ball I: the design of the pivot has three structural forms:
① the upper part of the sphere has a shaft, and the lower part is a shaft hole for a fixed shaft to insert. The structure of the sphere is a shaft and a hole structure.
② there are two upper and lower shaft holes on the sphere, which are inserted by the upper shaft and the lower shaft respectively. The structure is suitable for small diameters. The insertion depth of the hole is short, and it can only bear a small medium force. The structure is suitable for large diameters, can bear a large medium force, and the supporting journal is separated from the drive shaft. The drive shaft only bears the effect of torque.
③ there are two extending shafts on the sphere, two supporting plates vertically up and down. The medium force is transmitted to the valve body through the journal and the supporting plate. Similarly, the drive shaft only bears a single rotation. The moment action separates the medium force and the operating moment.

2). the valve body

Since the valve body is a forged cylinder, there is no usual valve neck. The valve neck is replaced by a stuffing box. The stuffing box is fixed on the platform of the valve body by bolts. The shaft seal is made of O-shaped rubber ring. The connecting support plate of the valve is also fixed on the valve body through the through hole on the stuffing box. It can be seen that the strength of the valve body in the journal part of this cylindrical structure is greatly weakened.

As for the structure of the valve body, like the floating ball valve, there are two types: side-mounted and top-mounted.

The side-mounted type can be divided into two sections, a main valve body and a secondary valve body structure, or a three-section type, a main valve body and two secondary valve body structures.

The top-mounted valve body is an integral structure. The upper valve cover uses bolts to form a complete pressure boundary with the valve body. The ball is a ball with upper and lower support shafts. The lower support bearing is embedded in the valve body, and the upper support bearing is placed in the valve cover. , The upper shaft end is machined with a groove connected to the flange of the shaft head to transmit torque. The medium force acts on the bearing. The drive shaft only transmits torque. It is designed as a blow-out prevention structure. The design of the valve seat The difficulty of assembly or disassembly is that the valve seat must move to both sides when the ball is installed in the valve cavity. In this way, a slidable back valve seat is designed. The valve seat is retracted into the left and right channels in advance. After the ball is installed, pass the back The flange on the valve pushes the valve seat to the center of the ball, and then uses a snap ring to snap into the groove of the back valve seat. When disassembling, first take out the snap ring, and then push the valve seat into the left and right sides of the valve cavity. In the right channel, the sphere can be taken out from the upper part. Therefore, the top-mounted structural ball has the advantage of being able to be repaired online.

Related types of valves:

We can also produce gate valve, check valve, globe valve, knife gate valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D,

Daily maintenance and precautions of ball valves

August 14, 2020

Daily maintenance of ball valve:
Long service life and maintenance-free period will depend on the following factors: normal working conditions, maintaining a harmonious temperature/pressure ratio, and reasonable corrosion data.

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When the ball valve is closed, there is still pressurized fluid inside the valve body.

Before maintenance: relieve the pipeline pressure and leave the valve in the open position; disconnect the power or air source; separate the actuator from the bracket.

It is necessary to find out that the upstream and downstream pipelines of the ball valve have indeed been relieved of pressure before disassembling.

Care must be taken to prevent damage to the sealing surface of parts, especially non-metal parts, when disassembling and reassembling. Special tools should be used when removing O-rings.

The bolts on the flange must be tightened symmetrically, gradually and evenly during assembly.

The cleaning agent should be compatible with the rubber parts, plastic parts, metal parts and working medium (such as gas) in the ball valve. When the working medium is gas, gasoline (GB484-89) can be used to clean metal parts. Clean non-metal parts with pure water or alcohol.

Non-metal parts should be taken out of the cleaning agent immediately after cleaning, and should not be soaked for a long time.

After cleaning, it needs to be assembled after the cleaning agent of the wall surface to be washed evaporates (can be wiped with silk cloth not soaked in cleaning agent), but it should not be left for a long time, otherwise it will rust and be contaminated by dust.

New parts also need to be cleaned before assembly.

When assembling, it should not be allowed to have metal chips, fibers, grease (except those specified for use), dust, other impurities, foreign objects, etc., to contaminate, adhere or stay on the surface of the parts or enter the cavity. Then tighten the stem nut.

Note: Don’t lock it too tightly, usually lock 1/4 turn to 1 turn, the leakage will stop.

A), disassembly

Keep the valve in a half-open position to flush and remove dangerous substances that may exist inside and outside the valve.

Close the ball valve, remove the connecting bolts and nuts on both flanges, and then completely remove the valve from the pipeline.

Disassemble the drive device-actuator, connecting bracket, lock washer, stem nut, butterfly shrapnel, glam, wear-resistant piece, stem packing in order.

Remove the body cover connecting bolts and nuts, separate the valve cover from the valve body, and remove the valve cover gasket.

Make sure that the valve ball is in the “off” position. This will make it easier to take it out of the valve body, and then take out the valve seat.

Gently push the stem down from the hole in the valve body until it is completely taken out, and then take out the O-ring and the lower packing of the stem.

Note: Please operate carefully to avoid scratching the surface of the valve stem and the sealing part of the valve body stuffing box.

B), reassembly

Clean and inspect the removed parts. It is strongly recommended to replace the valve seat and valve cover gasket with spare parts kit.

Assemble in the reverse order of disassembly.

Use the specified torque to tighten the flange connecting bolts crosswise.

Tighten the stem nut with the specified torque.

After installing the actuator, input the corresponding signal to drive the valve core to rotate by rotating the valve stem to make the valve open and close.

If possible, please perform pressure seal test and performance test on the valve according to relevant standards before reinstalling the pipeline.

Applicable occasions and operation method of ball valve

August 14, 2020

Applicable occasions of ball valve:
Since the ball valve usually uses rubber, nylon and polytetrafluoroethylene as the seat sealing ring material, its use temperature is limited by the seat sealing ring material. The cut-off effect of the ball valve is accomplished by

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pressing the metal ball against each other between the plastic valve seats under the action of the medium (floating ball valve). Under the action of certain contact pressure, the seat sealing ring has elastic-plastic deformation in some areas. This deformation can compensate the manufacturing accuracy and surface roughness of the ball, and ensure the sealing performance of the ball valve.

In addition, since the seat sealing ring of the ball valve is usually made of plastic, when selecting the structure and performance of the ball valve, the fire resistance and fire resistance of the ball valve must be considered, especially in the petroleum, chemical, metallurgical and other sectors, in the flammable and explosive media Ball valves are used in the equipment and piping systems, and more attention should be paid to fire and fire resistance.

Generally, in two-position adjustment, strict sealing performance, mud, wear, necking channel, rapid opening and closing action (1/4 turn opening and closing), high pressure cut-off (large pressure difference), low noise, cavitation and vaporization, In piping systems with a small amount of leakage to the atmosphere, small operating torque and low fluid resistance, ball valves are recommended.

Ball valves are also suitable for piping systems with light structure, low pressure cut-off (small pressure difference), and corrosive media. Ball valves can also be used in cryogenic (cryogenic) devices and pipeline systems. In the oxygen pipeline system of the metallurgical industry, ball valves that have undergone strict degreasing treatment are required. When the main line in the oil pipeline and gas pipeline needs to be buried underground, full-diameter welded ball valves are required. When the adjustment performance is required, a ball valve with a special structure with a V-shaped opening should be selected. In petroleum, petrochemical, chemical, electric power, and urban construction, metal-to-metal sealed ball valves can be used for pipeline systems with operating temperatures above 200 degrees.

Operation method of ball valve:
1) Before operation, make sure that the pipeline and valve have been flushed.

2) The operation of the valve drives the valve stem to complete rotation according to the size of the input signal of the actuator: when it rotates 1/4 turn (90°) in the forward direction, the valve is closed. When reverse rotation is 1/4 turn (90°), the valve opens.

3) When the actuator direction indicator arrow is parallel to the pipeline, the valve is open; when the indicator arrow is perpendicular to the pipeline, the valve is closed.

Hard seal installation method of ball valve

August 14, 2020

Hard seal installation method of ball valve:

1) Remove the protective covers on both sides of the flange, and rinse and clean with the valve fully opened.

ball valve (6)

2) Before installation, the whole machine should be tested according to the specified signal (electrical or pneumatic) (to prevent vibration caused by transportation from affecting the performance), and then it can be installed online (wiring according to the electric actuator circuit diagram).
3) Before preparing to connect with the pipeline, flush and remove the remaining impurities in the pipeline (these substances may damage the valve seat and ball).
4) During installation, please do not use the actuator part of the valve as a lifting point to avoid damage to the actuator and accessories.
5) This type of valve should be installed in the horizontal or vertical direction of the pipeline.
6) The pipeline near the installation point should not be drooping or bear external force. Pipe supports or supports can be used to eliminate pipeline deviation.
7) After connecting with the pipeline, please cross-tighten the flange connecting bolts with the specified torque.

Tianjin Tanghai Valve Manufacturing Co., Ltd. is one of the largest ball valve manufacturers in China, main products are butterfly valves, check valves, gate valve and globe valves. Key words: butterfly valve, lug type butterfly valve, wafer type butterfly valve, U-type butterfly valve, double flange butterfly valve, gate valves, check valves, globe valves, valve parts (Valve body, Valve disc, Valve shaft, Valve seat…)

Installation instructions for ball valves

August 14, 2020

Installation instructions for ball valves:

1. Indoor devices or outdoor applications with protective methods;

ball valve (7)

2. Outdoor installations are corroded by wind, sand, rain, dew, and sunlight;
3. Have flammable, explosive gas or dust environment;
4. Humid tropical and dry tropical environment;
5. The temperature of the pipeline medium is as high as 450℃;
6. The ambient temperature is lower than -20℃;
7. Easy to be flooded or immersed in water;
8. Possess a radioactive material (nuclear power plant and radioactive material test device) environment;
9.The environment on the ship or dock (with salt spray, mold, humidity);
10.Occasions with severe vibration; occasions prone to fire;

For the electric ball valve in the above environment, the electric device structure, material and protection method are different. Therefore, the corresponding valve electric device should be selected according to the above-mentioned obligation environment. According to engineering control requirements, for electric ball valves, their control functions are completed by electric devices. The purpose of applying electric ball valves is to complete non-manual electrical control or computer control of valve opening, closing and adjustment linkage. The application of electric devices is not just for diligence and labor saving. Since the functions and quality of products from different manufacturers are quite different, the selection of electric devices and the selection of valves are equally important to the project. As the requirements of industrial automation level are constantly improving, on the one hand, the application of electric valves is increasing, and on the other hand, the control requirements for electric valves are getting higher and higher and more complicated. Therefore, the design of electric valves in electrical control is always updated. With the continuous improvement of use requirements and the popularization and application of computers, new and diverse electrical control methods will always appear. Regarding the overall control of the electric valve, attention should be paid to the selection of the control method of the electric valve. For example, depending on the needs of the project, whether to use a centralized control method or a single control method, whether to link with other equipment, sequence control or application computer sequence control, etc., the control principles are different. The sample of valve electric device manufacturers only gives standard electric control principles, so the application department should make technical clarifications with the electric device consumer to understand the technical requirements.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

The parameter and troubleshooting of the ball valve

August 14, 2020

The parameter level of the ball valve:

1. Nominal pressure or pressure level: PN1.0-32.0MPa, ANSI CLASS 150-900, JIS10-20K;

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2. Nominal diameter or caliber: DN6～900, NPS 1/4 ～36;

3. Connection method: flange, butt welding, thread, socket welding, etc.;

4. Applicable temperature: -196℃～540℃;

5. Drive mode: manual, worm gear drive, pneumatic, electric, hydraulic, gas-liquid linkage, electro-hydraulic linkage;

6. Valve body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti. Different materials are used, which can be applied to various media such as water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, etc.

Pressure limit of ball valve:
The nameplate shows the maximum allowable operating pressure of the ball valve at the maximum and minimum operating temperatures.

Seats and seals made of PTFE or RTFE are used. The operating temperature of other types of seat and seals should be checked by the KI factory.

The nominal pressure rating (PN) of the valve can indicate the maximum working pressure of the valve under normal temperature conditions. (For example: PN4.0, indicating that the maximum working pressure is 40 Bar (4.0MPa) when the operating temperature is between -190C and 380C).

For the precautions of electric or pneumatic actuators, refer to their corresponding instructions.

Troubleshooting of the ball valve:
The ball valve has been scoured by the material for a long time, causing friction, causing severe impact and abrasion, which cannot meet the normal production, and at the same time, the equipment life is shortened. At present, wear-resistant materials, such as ceramic materials and polymer composite materials, are mostly used for the wear of ball valves, and there are more technical systems used. The polymer material has superior adhesion performance, super wear resistance, and safely solves the disadvantages of frequent metal wear and ensures the normal production of enterprise equipment. Moreover, the unique ceramic material and special surface strengthening agent in the material make it better than any steel or even ceramic tile in wear resistance and physical impact resistance in the harshest dry grinding environment. The incompatibility of the product with coal is to prevent Ideal material for coal deposits.

Product features and advantages of ball valve

August 14, 2020

Product features of ball valve:
1. The three-way ball valve adopts an integrated structure in structure, with a four-sided valve seat sealing type, fewer flange connections, high reliability, and a lightweight design.

ball valve (8)

2. The three-way ball core is divided into T type and L type, with long service life, large circulation capacity and low resistance.

3. The ball valve is divided into two types: single-acting and double-acting according to the action type. The single-acting type is characterized in that once the power source fails, the ball valve will be in the state required by the control system.

Advantages of ball valve:

1. The fluid resistance is small, and its resistance coefficient is equal to that of a pipe section of the same length.

2. Simple structure, small size and light weight.

3. It is tight and reliable, and the sealing surface material of the ball valve is widely used in plastics and has good sealing performance. It has also been widely used in vacuum systems.

4. It is easy to operate and open and close quickly. It only needs to rotate 90° from fully open to fully closed, which is convenient for remote control.

5. The maintenance is convenient, the structure of the ball valve is simple, the sealing ring is generally movable, and it is convenient to disassemble and replace.

6. It has a wide range of applications, with a diameter ranging from a few millimeters to a few meters, and can be applied in high vacuum or high pressure.

This type of valve is a high-pressure ball valve commonly used in existing mines. It bears high pressure and adopts a U-shaped card quick connection method. It can be quickly installed and disassembled in the daily production and use of the mine, and is convenient to use.

The ash unloading ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. The ash unloading ball valve can be divided into floating ball type, fixed ball type, and elastic ball type. The ash unloading ball valve is mainly used to cut off or connect the medium in the pipeline. It can also be used for fluid adjustment and control. The ash unloading ball valve Compared with other valve types, it has angular stroke output torque, opens quickly, is stable and reliable, and is widely applicable. The working principle of the ash unloading ball valve is to make the valve unblocked or blocked by rotating the valve.

Electric ball valve structure is composed of only a few parts, saving data; small size, light weight, small installation size, electric ball valve structure diagram, small driving torque, pressure regulating valve, easy and agile operation, only need to rotate 90° Fast opening and closing; and also has a good flow regulation effect and sealing characteristics at the same time, in the application of large and medium caliber, medium and low pressure, electric ball valve is the dominant valve form. When the electric ball valve is in the fully open position, the thickness of the butterfly plate is the resistance when the medium flows through the valve body, so the pressure drop that occurs through the valve is small, so it has better flow control characteristics. Electric ball valves have two sealing types: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be embedded in the valve body or attached to the periphery of the butterfly plate. Valves with metal seals generally have a longer life than valves with elastic seals, but it is difficult to achieve a complete seal. Metal seals can adapt to higher operating temperatures, while elastic seals have the disadvantage of being limited by temperature. If the electric ball valve is requested to be used as a flow control, it is important to accurately select the size and type of the valve. The construction principle of the electric ball valve is particularly suitable for manufacturing large diameter valves. Electric ball valves are not only widely used in general industries such as petroleum, gas, chemical, and water disposal, but also used in cooling water systems of thermal power stations. Commonly used electric ball valves include wafer type electric ball valves and flange type electric ball valves. Wafer type electric ball valve uses double-head bolts to connect the valve between two pipe flanges. Flange type electric ball valve is equipped with flanges on the valve. The two flanges on the valve are connected to the pipe flanges with bolts. The strength performance of the valve refers to the ability of the valve to withstand medium pressure. The valve is a mechanical product that is subjected to internal pressure, so it must have sufficient strength and rigidity to ensure long-term use without cracking or deformation. Pneumatic ball valve is composed of ball valve and pneumatic actuator. Pneumatic actuator is divided into double-acting pneumatic actuator and single-acting pneumatic actuator. Through solenoid valve control, ball valve switching action is realized. The pneumatic ball valve can realize intelligent control, quickly open or close the pipeline, and can effectively control and manage the pipe network.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Characteristics of ball valve

August 14, 2020

Features of ball valve:
1. Wear resistance; because the valve core of the hard-sealed ball valve is spray-welded alloy steel,

ball valve (2)

The sealing ring is made of alloy steel surfacing, so the hard sealing ball valve will not produce too much wear when opening and closing. (Its hardness coefficient is 65-70):

Second, the sealing performance is good; because the sealing of the hard-seal ball valve is manually ground, it can be used until the valve core and the sealing ring are completely matched. So his sealing performance is reliable.

3. The switch is light; since the bottom of the sealing ring of the hard-sealed ball valve adopts a spring to make the sealing ring and the valve core tightly hug together, the switch is very light when the external force exceeds the preload of the spring.

4. Long service life: It has been widely used in petroleum, chemical industry, power generation, papermaking, atomic energy, aviation, rockets and other departments, as well as people’s daily life.

The pneumatic ball valve has a simple and compact structure, reliable sealing, and convenient maintenance. The sealing surface and the spherical surface are always in a closed state, which is not easy to be eroded by the medium. It is easy to operate and maintain. It is suitable for general working media such as water, solvent, acid and natural gas. It is mainly used for cutting off. Or connect the medium in the pipeline, and can also be used for fluid adjustment and control.

Compared with other types of valves, pneumatic ball valves have angular stroke output torque, quick opening, stable and reliable, wide application, and the following advantages:

1. The thrust bearing reduces the friction torque of the valve stem, which can make the valve stem operate smoothly and flexibly for a long time.

2. Anti-static function: a spring is set between the ball, valve stem and valve body, which can lead out the static electricity generated during the switching process.

3. Since materials such as polytetrafluoroethylene have good self-lubricating properties and small friction loss with the ball, the pneumatic ball valve has a long service life.

4. Small fluid resistance: Pneumatic ball valves have the smallest fluid resistance among all valve categories. Even the reduced diameter pneumatic ball valves have relatively small fluid resistance.

5. Reliable valve stem sealing: Since the valve stem only rotates and does not move up and down, the packing seal of the valve stem is not easy to be damaged, and the sealing ability increases with the increase of the medium pressure.

6. Good sealing performance of the valve seat: The sealing ring made of elastic materials such as polytetrafluoroethylene is easy to seal in structure, and the valve sealing capacity of the pneumatic ball valve increases with the increase of the medium pressure.

7. The fluid resistance is small, and the full-bore ball valve basically has no flow resistance.

8. Simple structure, small size and light weight.

9. Close and reliable. It has two sealing surfaces, and the sealing surface materials of the ball valve are widely used in various plastics, which have good sealing performance and can achieve complete sealing. It has also been widely used in vacuum systems.

10. Convenient operation, rapid opening and closing, only need to rotate 90° from fully open to fully closed, which is convenient for remote control.

11. Convenient maintenance, simple structure of the ball valve, generally movable sealing ring, easy to disassemble and replace.

12. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium. When the medium passes, it will not cause erosion of the valve sealing surface.

13. It has a wide range of applications, with a diameter ranging from a few millimeters to a few meters, and can be applied from high vacuum to high pressure.

14. Because the ball valve has wiping properties during opening and closing, it can be used in media with suspended solid particles.

15. The processing precision is high, the cost is expensive, and it is not suitable for use in high temperature. If there are impurities in the pipeline, it is easy to be blocked by the impurities, causing the valve to fail to open.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

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Product features and advantages of ball valve

Characteristics of ball valve

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