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Ventilation butterfly valve installation instructions

July 5, 2021

Ventilation butterfly valve installation | instructions for use
Instructions for use of the ventilation butterfly valve:
The structural design of the ventilation butterfly valve should be combined with the operating conditions of the valve.

ventilation butterfly valve (2)

1. Under the smelting conditions with high temperature and high dust content, the design of the ventilation butterfly valve can adopt a flat inclined plate structure. There is a gap between the butterfly plate and the valve body of this structure. The gap value is based on the valve diameter and workmanship. The operating conditions are determined, and generally controlled within 0.5% of the channel area, which can meet the requirements of the ventilation butterfly valve installation, temperature changes in working conditions, and melting process requirements. To
2. Under the condition of high temperature and low dust content, the design of the ventilation butterfly valve can adopt the vertical plate structure. The sealing surface of the structure is easy to process, and the gap value of the sealing surface is controlled within 0.2% of the channel area. The dimensional accuracy of the valve body and butterfly plate sealing pair can meet the design requirements through mechanical processing.
3. For working conditions with high temperature, low pressure and strict sealing requirements, the design of the ventilation butterfly valve adopts a lever-type plane structure. The sealing pair preparation and butterfly plate running track can meet the technological requirements of high sealing performance pipe network equipment.
The main body seal of the ventilation butterfly valve selects different structures according to different working conditions, which is conducive to the production and use of the valve. The shaft end structure design of the ventilating butterfly valve adopts an external support structure with excellent heat insulation and sealing effects, which can realize the function of sealing the second shaft end of the valve and then supporting it, which is convenient for adjustment, and will not cause shaft end jam. When the direct connection or the crank connecting rod mechanism is connected with the transmission mechanism, the installation of the heat insulation sleeve can effectively keep away the influence of the high temperature environment on the transmission device and ensure the normal operation of the valve. The valve body and butterfly plate of the large-diameter ventilating butterfly valve should be cast or welded according to the requirements of the working conditions, and ribs should be configured, and reasonable process plans and materials should be selected to improve the rigidity of the product and prevent product deformation.
Precautions for installation of ventilation butterfly valve:
The installation position of the ventilation butterfly valve in the pipe network and the pipe network layout also affect the use of the valve. The closed funnel is designed at the opening end of the valve or the corner of the valve connection for the pipe with large smoke and dust. Regular dust removal can prevent excessive dust accumulation, which is beneficial The rotation of the butterfly board. There are several issues that should be paid attention to when installing the ventilation butterfly valve.
1. The use of metal gaskets must ensure that the load is uniform, and avoid the additional pressure of the valve due to the influence of temperature and self-weight or the stress caused by welding, and the deformation of the valve flange and pipeline.
2. When the valve is installed in a place with a long pipeline, a support frame should be installed.
3. The valve installation should pay attention to the medium flow direction, so that the opening direction of the butterfly plate is consistent with the pipeline medium flow direction, which is beneficial to the self-cleaning effect of the medium flow rate.
4. Strengthen the protection of the overall insulation layer of the pipe network so that the pipe wall temperature is above the dew point, which can reduce the low-temperature cohesive dust accumulation. If the pipe wall temperature is higher than the acid dew point of the flue gas, the condensation of acid vapor on the heated pipe wall can be avoided, and the generation rate of sulfur trioxide can be controlled, and the valve will be more effective. To
The installation position of the ventilation butterfly valve varies according to the design of the pipeline, such as horizontal, vertical and angled. Generally, vertical pipe installation of the ventilation butterfly valve has a better effect and is not easy to accumulate dust, followed by horizontal pipes, and has the worst effect at angles. The turning points on both sides of the valve inlet and outlet are most likely to form drift and ash blockage, and the valve operating torque will increase.
Related Products: Electric Ventilation Butterfly Valve Pneumatic Ventilation Butterfly 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

Types and classifications of ball valves

July 2, 2021

Types and classifications of ball valves
A ball valve is a valve with a sphere as a closing part. It is mainly composed of a valve body, a valve seat, a sphere, a valve stem, and a handle (or other driving devices, such as electric actuators, pneumatic actuators or hydraulic actuators). The valve stem drives and rotates around the axis of the ball valve. It is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline.

fixed ball valve

For the wide variety of ball valves, including the different working principles, use media and application places, users should choose different types of ball valves corresponding to the requirements of the working conditions. The types of ball valves are classified according to the actual working conditions on site.
According to the structure, it can be divided into:
1. Floating ball valve The ball of the ball valve is floating. Under the action of the medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end to ensure that the outlet end is sealed. The floating ball valve has a simple structure and good sealing performance, but the load of the sphere bearing the working medium is all transmitted to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the sphere medium. This structure is widely used in medium and low pressure ball valves.

Pneumatic electric high platform ball valve

2. Fixed ball valve The ball of the ball valve is fixed and does not move after being pressed. The fixed ball valve is equipped with a floating valve seat. After the pressure of the medium, the valve seat moves, so that the sealing ring is pressed tightly on the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts of the sphere, and the operating torque is small, which is suitable for high-pressure and large-diameter valves. In order to reduce the operating torque of the ball valve and increase the usability of the seal, oil-sealed ball valves have appeared in recent years. Special lubricants are injected between the sealing surfaces to form an oil film, which enhances the sealing performance and reduces the operating torque. , It is more suitable for high-pressure and large-caliber ball valves.
3. Elastic ball valve The ball of the ball valve is elastic. The sphere and the valve seat sealing ring are made of metal materials, and the specific pressure of the seal is very large. According to the pressure of the medium itself, it has not reached the sealing requirements, and external force must be applied. This valve is suitable for high temperature and high pressure media. The elastic sphere is made by opening an elastic groove on the lower end of the inner wall of the sphere to obtain elasticity. When closing the passage, use the wedge-shaped head of the valve stem to expand the ball and press the valve seat to seal. Loosen the wedge-shaped head before rotating the ball, and the ball will return to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction of the sealing surface and the operating torque.
The commonly used ball valve classification methods are as follows:
According to pressure: high pressure ball valve, medium pressure ball valve, low pressure ball valve
According to the runner type: full bore ball valve, reduced bore ball valve
By channel position: straight-through, three-way, right-angle
According to the temperature: high temperature ball valve, normal temperature ball valve, low temperature ball valve, ultra-low temperature ball valve According to the sealing form: soft sealing ball valve, hard sealing ball valve
Assembly by stem: top-mounted ball valve, side-mounted ball valve
According to the connection form: flange ball valve, welded ball valve, threaded ball valve, clamp ball valve
According to the driving mode: manual ball valve, automatic control ball valve (pneumatic ball valve, electric ball valve, hydraulic ball valve)
According to the size of the caliber: super large caliber ball valve, large caliber ball valve, medium caliber ball valve, small caliber 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

Electric globe valve model coding method

July 2, 2021

Representation method of electric shut-off valve model in China. Globe valve is also called cut-off valve or stop valve.
As a cut-off valve, the electric shut-off valve is the most widely used and one of the most important valves. It is not only suitable for medium and low pressure pipelines, but also for high pressure places, and is relatively durable. It

Globe valve (9)

relies on electric thrust to control the flow of the medium. However, since there are many types of electric shut-off valves and their structural forms are changeable, users should be familiar with the expression method of their model preparation when choosing electric shut-off valves, so as to avoid problems such as selecting the wrong type, replacing goods and returning goods!
The description of the electric shut-off valve model is represented by the code of the shut-off valve type, drive mode, connection mode, structure form, sealing material, nominal pressure, valve body material, etc., mainly for the model description of the existing electric shut-off valve products, such as customized When the material and structure of the globe valve products change, please select according to the valve preparation method.
The method of preparing the model of the electric shut-off valve:
Additional code for stop valve: W: means bellows, D: means low temperature, B: means heat preservation;
1) Type code of globe valve: J: means globe valve;
2) Stop valve transmission mode: manual without code, 5: bevel gear, 6: pneumatic, 9: electric;
3) Connection mode of stop valve: 4: flange connection, 6: welding;
4) The structure of the globe valve: 1 straight-through type, 2 Z-type straight-through, 3 three-way, 4-angle type, 5 Y-type DC type, 6 balanced straight-through type, 7 balanced angle type, 8-pin type;
5) Seal material of globe valve: F: fluorine rubber, H: stainless steel, N: nylon plastic, Y: cemented carbide, M: Monel alloy, W: valve body directly processed;
6) The nominal pressure of the shut-off valve: 16: means that the pressure of 1.6mpa is 16 kilograms, PN1.6-32mpa, IN150LB-1500LB, 5-63K;
7) Globe valve body material: A: titanium alloy, C: carbon steel, I: chromium molybdenum steel, P: stainless steel 304, R: stainless steel 316;
Examples of electric shut-off valve model preparation:

electric globe valve

J941F46-16C Electric flange fluorine-lined globe valve
1. J: indicates the stop valve;
2. 9: indicates that the transmission mode is electric;
3. 4: The connection method is flange connection;
4. 1: The structure is a straight flow channel;
5. F: The sealing material is fluorine rubber;
6. 16: Indicates that the nominal pressure is 1.6MPa;
7. C: Indicates that the valve body material is carbon steel.

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

V-type regulating ball valve

July 1, 2021

Working principle of pneumatic V-type regulating ball valve
The ball core of the pneumatic V-shaped regulating ball valve is designed with a special V-shaped notch, which has a shearing effect on the valve seat. It is especially suitable for media containing fibers, small solid particles, slurry and other media. According to different structural methods, it can generally be divided into flange and Wafer type; Pneumatic V-type ball valve is a fixed ball valve and also a single-seat sealed ball valve. It has the best adjustment performance among ball valves and can achieve flow adjustment. At the same time, since the valve core and seat are rotated without gaps, they can be wiped by themselves. The fouling on the ball and valve seat keeps a good seal between the ball and the valve seat.

electric V type ball valve

Working principle of pneumatic V-shaped regulating ball valve:
Pneumatic V-shaped regulating ball valve realizes different degrees of proportionality according to the V-shaped angle of the V-shaped sphere. It is generally used in conjunction with a valve positioner to achieve proportional adjustment. The V-shaped spool is most suitable for various adjustment occasions and has a large rated flow coefficient. ,, The pressure loss is small, the use flow capacity is large, and it has accurate shut-off characteristics and control functions. The flow characteristics are approximately equal percentages. The opening and closing parts adopt the V-shaped ball structure, which completely solves the problem of easy deposition of medium in the valve cavity.
Features of pneumatic V-shaped regulating ball valve:
1. Pneumatic V-shaped ball valve V-shaped gap and valve seat produce a strong shear force to cut off impurities such as fibers, and has a self-cleaning function to avoid valve jamming.
2. The pneumatic V-type regulating ball valve has an inherent flow characteristic of approximately equal percentage and an adjustable ratio of up to 300:1, so it can provide precise control in a wide range of changes.

Note: Because the pneumatic V-type regulating ball valve is generally a single-seat sealed ball valve, it is not suitable for two-way use. Due to its streamlined shape and full right-angle rotation control, the maximum volume is extremely high, the flow capacity is particularly large, and the flow resistance is small.

pneumatic V type ball valve

Pneumatic V-type regulating ball valve principle dynamic diagram
The valve core of the pneumatic V-shaped regulating ball valve is designed as a V-shaped gap with a special switch. The V-shaped gap and the valve seat generate a strong shear force, which can cut off high-viscosity media containing fibers or small solid particles, and has a self-cleaning function , To avoid the phenomenon of valve jamming. Pneumatic V-shaped ball valve is suitable for regulation and control, with high stability. Even in the case of small flow or high-viscosity medium, it can also ensure the accuracy of control within the entire range; while O-shaped ball valve is suitable for cutting off, relatively It is economical.
There is a V-shaped opening on the sphere of the pneumatic V-shaped regulating ball valve. As the ball rotates, the opening area changes, but the shape of the opening surface is always triangular. The flow characteristics are approximately equal percentages, the adjustable ratio is large, and the pressure loss is small. The flow capacity is large, and it has accurate interception characteristics and control functions. The opening and closing parts adopt a V-shaped spherical structure, which completely solves the problem of easy deposition of medium in the valve cavity. It is suitable for fibrous and slurry fluids!
The angle of the V-shaped port of the pneumatic V-shaped ball valve can be customized to meet more precise shut-off characteristics and control functions. Generally, more V-shaped valves are used in slurry media. They are similar to cam flex valves and are much better than O-shaped valves. V-shaped ball valves are used as regulating valves. For example, if the medium is not clean, the flow coefficient is low, and the leakage level is high, etc. occasion.

Working principle of electric V-type regulating ball valve

V type ball valve drawing

The electric V-shaped regulating ball valve has a special-shaped V-shaped incision. When the valve is closed, the V-shaped incision and the valve seat form a wedge shape, which has a shearing effect. The electric V-shaped ball valve is suitable for the control of fibrous slurry, sewage and viscous particle media. It can prevent the seizure of dirt between the ball and the valve seat. It has a self-cleaning function and is a wide-ranging regulating valve.
When the electric V-shaped ball valve rotates, the V-shaped blade of the ball is tangent to the valve seat, thereby cutting off the fiber and solid matter in the fluid. However, the general ball valve does not have this function, so it is easy to cause the fiber impurities to get stuck when closed. , Bring great inconvenience to repair and maintenance. The valve core of the electric V-shaped ball valve will not be jammed by the fiber, and the flow rate of the pipeline medium is adjusted and controlled according to the change of the opening area of the V-shaped gap.
Note: Since the electric V-type regulating ball valve is generally a single-seat sealing ball valve, it is not suitable for two-way use. The integral valve body structure is adopted, and there is no potential for leakage.
Features of electric V-shaped ball valve:
1. It has the advantages of compact structure, small volume, vertical and horizontal installation, etc., adopts movable metal valve seat, self-compensation function, and has superior sealing performance and long service life.
2. The electric V-shaped ball valve adopts a double-bearing structure, which has high mechanical stability and low starting torque, which ensures that the valve has excellent sensitivity and induction speed.
3. Maximum reliability (safety): The valve body is a whole, sturdy and durable, operation is not affected by pipeline pressure, and leakage of the valve body can be avoided.
4. The V-shaped gap and valve seat of the electric V-shaped regulating ball valve produce a strong shearing force to cut off impurities such as fibers, and has a self-cleaning function to avoid valve jamming.
5. Maximum flow volume: Due to the streamlined shape of the electric V-shaped ball valve and the full right-angle rotation control, the maximum volume is particularly high, the flow capacity is particularly large, and the flow resistance is small.

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

Pneumatic globe valve model preparation method

July 1, 2021

Pneumatic globe valve /cut-off valve model preparation method
Pneumatic shut-off valve is used to open and close the pipeline medium by compressed air, and the action speed is relatively faster. Different materials and seals are selected, which can be applied to various pressure, temperature

and medium conditions, and the seal is reliable and the performance is excellent. However, since there are many types of pneumatic stop valves and their structural forms are changeable, users should be familiar with their model designation method when choosing pneumatic stop valves, so as to avoid problems such as selecting the wrong type, replacing goods and returning goods!
Pneumatic globe valve model preparation instructions are represented by the code of the globe valve type, drive mode, connection mode, structure form, sealing material, nominal pressure, valve body material, etc., mainly for the model description of the existing pneumatic globe valve products, such as customized When the material and structure of the globe valve products change, please select according to the valve preparation method.
Pneumatic shut-off valve model preparation method:
Additional code for stop valve: W means bellows, D means low temperature, B means heat preservation;
1) Type code of globe valve: J means globe valve;
2) Stop valve transmission mode: manual without code, 5 bevel gear, 6 pneumatic, 9 electric;
3) Connection mode of stop valve: 4 flange connection, 6 welding;
4) The structure of the globe valve: 1 straight-through type, 2 Z-type straight-through, 3 three-way, 4-angle type, 5 Y-type DC type, 6 balanced straight-through type, 7 balanced angle type, 8-pin type;
5) Seal material of globe valve: F fluorine rubber, H stainless steel, N nylon plastic, Y cemented carbide, M Monel alloy, W valve body directly processed;
6) The nominal pressure of the shut-off valve: 16 means that the pressure of 1.6mpa is 16 kilograms, PN1.6-32mpa, IN150LB-1500LB, 5-63K;
7) Globe valve body material: A titanium alloy, C carbon steel, I chromium molybdenum steel, P stainless steel 304, R stainless steel 316;
Examples for the compilation of pneumatic shut-off valve models:

pneumatic globe valve

WJ641H-16C Pneumatic Bellows Globe Valve
1. W: means bellows
2. J: represents the stop valve;
3. 6: indicates that the transmission mode is pneumatic;
4. 4: The connection method is flange connection;
5. 1: The structure is a straight flow channel;
6. H: Hard seal made of stainless steel for the sealing pair;
7. 16: Indicates that the nominal pressure is 1.6MPa;
8. C: Indicates that the valve body material is carbon steel.

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

Pneumatic ball valve model preparation method

June 30, 2021

Pneumatic ball valve model preparation method/code name establishment in China.
With the rapid development of my country’s industrial modernization, the use of valves is also increasing. Pneumatic ball valves have the advantages of fast opening and closing speed, and not only can switch and cut off, but also control flow, etc., and become the most widely used valve type. one! However, due to the wide variety of pneumatic ball valves, including the use of pressure, temperature and control methods, the corresponding ball valve models are also different. In order to avoid errors in the selection of the user, and to ensure that the pneumatic ball valve can be used normally, more instruments Self-Control Valve Company hereby provides instructions for the preparation of pneumatic ball valve models for everyone to understand and recognize!

Pneumatic electric high platform ball valve

Pneumatic ball valve model editing instructions are mainly from the increase of additional conditions of the pneumatic ball valve, the selection of the drive mode, the difference of the connection form, the change of the structure form, the type of sealing material, the level of valve pressure and the material of the valve body, etc. to facilitate the explanation, hope It is helpful to the majority of users.
Pneumatic ball valve model representation method:
Ball valve additional code: V means the valve core has a V-shaped structure, D means low temperature, B means heat preservation, P means eccentric structure, U, S and DY mostly mean top-mounted type;
Ball valve name code: Q means ball valve; Ball valve drive code: 2 means electro-hydraulic, 3 means turbine, 6 means pneumatic, 7 means hydraulic, 9 means electric, manual without code;
Code of connection method: 1 means internal thread, 4 means flange type, 6 means welding, 7 means wafer type;
Structural type code: Floating type: 1 means straight-through runner, 2 means Y-type tee, 4 means L-type tee, 5 means T-type tee; Fixed type: 0 means hemispherical through, 6 means four-way runner, 7 Means straight-through flow to, 8 means L-type tee, 9 means Y-type tee;
Sealing material code: B babbitt alloy, F fluorine rubber, F46 lining fluorine, H stainless steel, J rubber lining, M Monel alloy, N nylon plastic, Monel P, Y cemented carbide, W valve body directly processed;
Pressure rating code: 16 means the pressure is 16 kg (1.6Mpa) and the maximum can reach 64Mpa; 150LB means the American standard pound pressure, and the maximum pressure rating can reach 2500LB (150LB=1.6MPA/300LB=2.5-4.0mpa/400LB=6.4 mpa/600LB=10mpa); 5K means Japanese pressure, maximum pressure is 63K; Valve body material code: A titanium and titanium alloy, C carbon steel, I chromium molybdenum steel, P18-8 series stainless steel, RMo2Ti series stainless steel, S plastic.
Pneumatic ball valve model editing instructions:
Q645F-16P Stainless steel pneumatic flange three-way ball valve
1. Q: represents the ball valve;
2. 6: It means that the transmission mode is pneumatic;
3. 4: The connection method is flange connection;
4. 5: The structure is a floating T-type tee;
5. F: The sealing material is fluorine rubber;
6. 16: Indicates that the nominal pressure is 1.6MPa;
7. P: indicates that the valve body is made of stainless steel.

More details for valve model establishment, you can visit another article: https://www.tanghaivalve.com/valve-model-establishment-and-meaning/

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

Working Principle of Pneumatic Gate Valve

June 29, 2021

Brief introduction of pneumatic gate valve:
The pneumatic gate valve is equipped with a pneumatic actuator, which is driven by compressed air to control the gate valve. The valve core is composed of a wedge-shaped structure and a parallel structure, which is suitable for the emergency cut-off and discharge of gas and liquid pipelines.

pneumatic gate valve (3)

Working principle of pneumatic gate valve:
When using the air source to operate the gate valve, the small handle of the manual device must be turned to the pneumatic position to open and close the nut and the screw rod. When the compressed air enters from the upper pipeline of the cylinder, the piston and the piston rod in the cylinder are pushed straight When the compressed air enters from the lower pipe, the gas pushes the piston and piston rod in the cylinder to move upwards, and at the same time drives the valve stem to move upwards to open the valve. When there is no air source, the screw rod and the opening and closing nut can be used to open and close the valve. First, the upper and lower intake pipes of the cylinder are in the exhaust state, and the small handle of the manual part is in the manual position, so that the opening and closing nut and the screw are in the manual position. In the normal meshing state, turn the large handwheel at the manual part at this time. When the handwheel is turned clockwise, the valve is closed, and when the handwheel is turned counterclockwise, the valve is opened. When the air source is introduced from the upper air inlet, the valve stem drives the valve plate to move downward, and the valve is closed.
When the air source is introduced from the lower air inlet, the valve stem drives the valve plate to move upward, and the valve opens.
Pneumatic gate valve parameters:
Actuator: cylinder piston structure;
Optional accessories: manual device, filter, solenoid valve, echo device, control box;
Main material: ductile iron, cast steel, stainless steel; Caliber: DN50-500;
Pressure: PN1.6-6.4mpa;
Temperature: Q-29～350℃, C-29～450℃, P-30～540℃;
Medium range: water, steam, petroleum, gas, fluid, medium containing hard particles and impurities.

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, API6

bellows globe valve vs ordinary globe valve

June 29, 2021

The difference and comparison between bellows globe valve and ordinary globe valve
The bellows globe valve is also called the bellows seal globe valve. Through automatic seam welding, a metal barrier is formed between the fluid medium and the atmosphere to ensure the design of zero leakage of the valve stem. Compared with traditional globe valves, it has the following advantages:

Globe valve (9)

1. The bellows globe valve has a long service life, reduces the number of maintenance and lowers operating costs. The sturdy and durable bellows seal design ensures zero leakage of the valve stem and provides maintenance-free conditions.
2. The valve opening and closing torque is small, reducing labor intensity, and can drive any form of driving device, which is convenient for remote control.
3. The appearance is beautiful, the valve channel has a smooth streamline, and the flow resistance coefficient of the valve is reduced. It is a high-quality energy-saving product.
4. The outer seal of the valve adopts bellows seal and graphite, stainless steel gasket seal, the seal is reliable, and the sealing packing does not need to be replaced for long-term use. In industrial use, the leakage caused by the stop valve: high temperature, highly toxic, flammable and explosive, radiant medium, etc., not only pollute the environment, but also often cause significant personal and property losses. However, this type of valve is much safer and more stable, and strictly adopts foreign advanced standards in design and manufacturing.

Advantages and application of bellows globe valve The bellows globe valve has no leakage, and it is safer to be used in high-risk media. Ordinary globe valve is sealed with packing, the valve stem and packing will slide, and it is easy to leak at low temperature (spool).
The bellows cut-off valve uses a closed bellows that can be stretched and compressed to replace the packing seal, which can effectively prevent external leakage caused by packing loss. It is generally used for the transmission of highly permeable media, such as valves on hydrogen systems, as long as the bellows is not damaged, there is generally no leakage; while the general shut-off valve is sealed with packing, which is prone to leakage.
The opening or closing stroke of the valve stem of this kind of valve is relatively short, and it has a very reliable cut-off function. Also, because the change of the valve seat port is proportional to the stroke of the valve disc, it is very suitable for flow adjustment. Therefore, this type of valve is very suitable for use as a shut-off or adjustment and throttling.

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

O type |V type ball valve structure principle

June 28, 2021

Ball valve structure diagram, O-type ball valve structure principle, V-type ball valve structure principle
Ball valve structure:
Ball valves have many structures, but they are basically the same. They are all round cores with opening and closing parts. They are mainly composed of valve seats, balls, sealing rings, valve stems and other driving devices, which can be realized by rotating the valve stem by 90 degrees. The opening and closing of the valve is used in the pipeline to shut off, distribute, adjust the flow rate and change the flow direction of the medium. The valve seat uses different valve seat sealing forms according to different working conditions. The valve body structure has one-piece type, two-stage type and three-stage type.

ball valve (3)

O-type ball valve structure:
The O-shaped ball valve has a ball with a middle through hole installed inside the valve body. A through hole with the same diameter as the pipe diameter is opened on the ball. The ball can rotate in the sealing seat, and there is a ring-shaped elasticity on both sides of the pipeline direction. Body to achieve sealing. By rotating the ball 90°, the direction of the through hole can be changed, thereby realizing the opening and closing of the ball valve.
O-type ball valve core (ball) is spherical. From the structural point of view, the ball seat is embedded on the side seat of the valve body when sealing. Relatively moving parts are made of self-lubricating materials with a very small friction coefficient, so the operating torque is small. In addition, the long-term sealing of the sealing grease makes the operation more flexible. It is generally used for two-position adjustment, and the flow characteristic is quick opening.

Principle of O type ball valve:
When the O-type ball valve is fully opened, the two sides are unobstructed valves, forming a straight pipe channel, two-way sealing, with the best “self-cleaning” performance, and suitable for two-position cutting occasions with particularly dirty and fiber-containing media. The ball core always creates friction with the valve during the opening and closing of the valve. At the same time, the seal between the valve core and the valve seat is achieved by the pre-tightening force of the valve seat pressing the ball core, but due to the soft sealing of the valve seat. Excellent mechanical and physical properties make it particularly tight.
V-shaped ball valve structure:
The V-shaped ball valve core has a V-shaped structure. The valve core is a 1/4 spherical shell with a V-shaped gap. It has a large flow capacity, a large adjustable range, a shear force, and a tight closing. It is especially suitable for fluids. Working conditions where the substance is fibrous. Generally, V-type ball valves are single-sealed ball valves. Not suitable for bidirectional use.
The edge of the valve core is V-shaped, and there is a V-shaped opening on the sphere. With the rotation of the ball, the change in the opening area of the middle can be used to adjust the flow, and the impurities in the fluid can be cut off and closed. It is suitable for pulp, Control of mortar and viscous fluid.

Principle of V-type ball valve:
V-shaped edge cuts off impurities. During the rotation of the ball, the V-shaped knife edge of the ball is tangent to the valve seat, thereby cutting off the fiber and solid matter in the fluid. However, the general ball valve does not have this function, so it is easy to cause the fiber impurities to get stuck when closed, which will cause maintenance and repair. Maintenance brings great inconvenience. The valve core of the V-shaped ball valve will not be jammed by the fiber. In addition, due to the use of flange connection, it is easy to disassemble and assemble, no special tools are needed, and maintenance is simple and easy. When the valve is closed. There is a wedge-shaped scissors effect between the V-shaped notch and the valve seat, which not only has the function of self-cleaning but also prevents the ball from jamming. The valve body, bonnet and valve seat adopt a metal point-to-point structure, and a smaller friction coefficient is used. The stem spring, therefore, has a small operating torque and is very stable.

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

Electric ball valve model preparation/code name designation method

June 24, 2021

Electric ball valve model preparation/code name designation method in China.
As an important equipment in the industrial automation control system, the electric ball valve has been used more and more in recent years due to its simple structure and convenient operation. It can not only be used to cut off or connect the medium in the pipeline, but also can be used for fluid Regulation and control! But because of the different working conditions of the pipeline, the electric ball valve models used are all different! The user should have a detailed understanding and cognition of the method of preparing the electric ball valve model!

Pneumatic electric high platform ball valve

This electric ball valve model editing method includes the addition of additional conditions for the ball valve, the selection of the drive mode, the different connection form, the change of the structure form, the type of sealing material, the level of the valve pressure and the valve body material, etc.!
Electric ball valve model representation method:
Ball valve additional code:
V means the spool has a V-shaped structure, D means low temperature, B means heat preservation, P means eccentric structure, U, S and DY mostly mean top-mounted type;
Ball valve name code: Q means ball valve; Ball valve drive code: 2 means electro-hydraulic, 3 means turbine, 6 means pneumatic, 7 means hydraulic, 9 means electric, manual without code;
Code of connection method: 1 means internal thread, 4 means flange type, 6 means welding, 7 means wafer type;
Structure type code:
Floating type: 1 means straight flow channel, 2 means Y-type tee, 4 means L-type tee, 5 means T-type tee;
Fixed: 0 means hemispherical straight through, 6 means four-way flow channel, 7 means straight flow to, 8 means L-type tee, 9 means Y-type tee;
Sealing material code: B babbitt alloy, F fluorine rubber, F46 lining fluorine, H stainless steel, J rubber lining, M Monel alloy, N nylon plastic, Monel P, Y cemented carbide, W valve body directly processed;
Pressure rating code: 16 means the pressure is 16 kg (1.6Mpa) and the maximum can reach 64Mpa; 150LB means the American standard pound pressure, and the maximum pressure rating can reach 2500LB (150LB=1.6MPA/300LB=2.5-4.0mpa/400LB=6.4 mpa/600LB=10mpa); 5K means daily pressure, the maximum pressure is 63K;
Valve body material code: A titanium and titanium alloy, C carbon steel, I chromium molybdenum steel, P18-8 series stainless steel, RMo2Ti series stainless steel, S plastic.
Editing instructions for electric ball valve model:
VQ947F-16P Stainless steel electric flange V-shaped ball valve
1. V: indicates that the spool has a V-shaped structure
2. Q: represents the ball valve;
3. 9: indicates that the transmission mode is electric;
4. 4: The connection method is flange connection;
5. 7: The structure is a fixed straight flow channel;
6. F: The sealing material is fluorine rubber;
7. 16: Indicates that the nominal pressure is 1.6MPa;
8. P: indicates that the valve body is made of stainless steel.

More details for valve model establishment, you can visit another article: https://www.tanghaivalve.com/valve-model-establishment-and-meaning/

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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