supplier Archives

The role and use of the ball valve

July 16, 2021

The function of the ball valve:
The opening and closing part of the ball valve is a round sphere with a hole. The ball core rotates around the axis of the valve stem by 0-90° back and forth to achieve the purpose of opening or closing the valve. Ball valves have many functions. They are generally used to switch off or adjust the medium in the pipeline. Among them, the three-way ball valve can flexibly cut off, distribute and change the flow direction of the medium. The sealing surface of the ball valve is usually closed with the spherical surface, so it is not easy to be eroded by the medium. It is easy to operate and has a simple and compact structure. It can be used in working conditions such as water, natural gas, acid, and solvent.

fixed ball valve

The application of the ball valve:
Ball valves can generally be divided into three categories: floating ball valves, fixed ball valves, and elastic ball valves according to their structure. According to the different sealing performance, it is divided into hard-sealed ball valves and soft-sealed ball valves. The soft-sealed ball valves have better sealing performance and can achieve zero leakage. They are generally used in normal temperature and pressure pipelines with corrosive media, while hard-sealed ball valves are not only It can be used in normal temperature and pressure, as well as pipelines with low temperature and low pressure and high temperature and high pressure.
(1) Floating ball valve
The ball of the floating ball valve is floating and is supported by two valve seats. Under the action of the medium pressure, the ball can produce a certain displacement and tightly adhere to the sealing surface of the valve seat at the outlet end to ensure that the outlet end is sealed. However, if the sphere bears the load of the working medium and is all transmitted to the outlet sealing ring, the sphere may deviate when it is impacted by a higher pressure. Therefore, the ball valve of this structure is generally suitable for normal pressure or low pressure working conditions.
(2) Fixed ball valve

Pneumatic electric high platform ball valve

The name of the fixed ball valve is that the ball is fixed, and when the valve is closed, the ball valve will not move even if it is pressurized. Fixed ball valves are equipped with a floating seat. After being pressured by the medium, the seat will move so that the sealing ring is pressed tightly on the sphere to ensure sealing. Generally, sliding bearings or rolling bearings are installed on the upper and lower shafts of the ball, which can be operated with a small torque and a small torque, and is generally suitable for high-pressure and large-diameter pipelines.
Other common classifications of ball valves, chip ball valves, orbital ball valves, V-shaped ball valves, O-shaped ball valves, cut-off ball valves, three-way ball valves, four-way ball valves, forged steel ball valves, ash unloading ball valves, anti-sulfur ball valves, eccentric ball valves, thermal insulation ball valves, pneumatic Ball valves, electric ball valves, ferrule ball valves, welded ball valves. Among them, the V-shaped ball valve has a shearing effect, which is especially suitable for media containing fibers, small solid particles, slurry and other media. The three-way ball valve can also be divided into T-type and L-type. The T-shape can make the three intersecting pipelines connect to each other or cut off any one of the channels, playing the role of splitting and merging. The L-shape only connects two perpendicular pipes, and cannot connect to the third pipe at the same time, and it mainly plays a role of distribution.
Related knowledge: working principle of ball valve structure diagram of 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

Types and classifications of globe valve

July 16, 2021

Type of globe valve / Classification of globe valve
The globe valve, also called the shut off valve or cut-off valve, is the most widely used valve, which is mainly composed of a valve body, a valve clack, a valve cover, and a valve stem. The valve body and valve cover are pressure-bearing parts, and the valve clack and valve stem are internal parts. The shut-off valve is a valve in which the closing part (disc) moves along the center line of the valve seat. According to this movement form of the valve disc, the change of the valve seat port is proportional to the valve disc stroke.

Classification of stop valves:
According to the structure of the valve body, the globe valve is divided into right-angle type, straight-through type and direct-flow type.
1. The right-angle fluid only needs to change its direction once, so that the pressure drop through this valve is smaller

than that of a conventional shut-off valve. The valve body is mostly forged, which is suitable for shut-off valves with smaller passages and higher pressures.

right-angle Globe valve (2)

2. The straight-through type is the most common structure. The medium inlet and outlet channels are 180° in the same direction, but the fluid resistance is the largest.

straight-through Globe valve (9)

3. In the direct-flow or Y-shaped stop valve, the flow channel of the valve body is in an oblique line with the main flow channel, and the fluid resistance is small. It is mostly used for fluids containing solid particles or high viscosity.

Y-shaped Globe valve (1)

Type of stop valve:
According to nominal pressure: vacuum, low pressure, medium pressure, high pressure, ultra high pressure valve, etc.;
According to working temperature: high temperature, medium temperature, normal temperature, low temperature, ultra-low temperature valve, etc.;

According to the driving mode: manual valve, power driven valve (electromagnetic, pneumatic, hydraulic, electric and various linkage valves), automatic valve, etc.;
According to the valve body material: cast iron, cast copper, cast steel, carbon steel, titanium, stainless steel valves, etc.;
By application sector: general purpose valves, power station valves, marine valves, metallurgical valves, pipeline valves, plumbing valves, etc.;
According to the structure: straight-through type, angle type, direct current type, etc.;
According to the connection form: internal thread, external thread, flange, welding,

clamp, clamp, ferrule, etc.;

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

Globe valve structures and design standard

July 15, 2021

Globe valve structure, Globe valve design standard
The shut-off valve is a particularly common shut-off valve, which is mainly used to connect or cut off the medium in the pipeline, and is generally not used to adjust the flow. The globe valve is suitable for a wide range of pressure and temperature, but it is generally used for medium and small diameter pipelines.

Globe valve (2)

Globe valve (1)

Globe valve (9)

Structural principle of globe valve:
1. The center of the inlet and outlet of the shut-off valve are on the same straight line, and the fluid flows like an S-shaped sphere, so it is also called a spherical shut-off valve.
2. When the valve seat of the valve stem descends toward the bottom sealing surface and is pressed down, the medium stops flowing; when the valve stem rises, the medium passes through the flow path from below to above.
Globe valves generally have direction requirements during installation. The flow direction of the medium in the pipeline generally flows from bottom to top through the valve seat port, which is what we often call the so-called “low inlet and high outlet”. The purpose of this is to reduce fluid resistance and save effort in opening. In the closed state, the valve stem and the packing culvert are not in contact with the medium to ensure that the valve stem and the packing culvert are not damaged or leaked.

Globe valve structure diagram Globe valve structure and design standards:

name	Globe valve structure	Globe valve design standard
Typical Forged Steel Globe Valve	1. Flow channel JB/T 7746-1995: Shrinkage hole BS5352-1999: Through hole or shrinkage hole (CL150~800); Through hole (Cl1500) JPI-7S-36-1999: Through hole 2. Valve body and bonnet Connection: flange, thread or welding 3. Connection end JB/T 7746-1995: internal thread, socket welding or flange BS5362-1999: internal thread, socket, flange and butt welding JPI-7S-36- 1999: Internal thread, socket	JB/T 7746-1995 BS 5352-1999 JPI-7S-36-1999
Internal pressure self-sealing forged steel globe valve	1. Flow path: shrinkage hole 2. Connection between valve body and bonnet: internal pressure self-sealing 3. Connection end: butt welding, flange or socket	ASME B16.34-1996
Cast steel globe valve	1. Flow path: angle type, straight-through, direct current (Y type) 2. Connection between valve body and bonnet: flange 3. Connection end: flange or butt welding 4. Various types of discs can be used, Usually exposed rod, there are also a few smaller diameter valves with dark rod	JPI-7S-46-1999 JIS B2071-1999 JIS B2072-1999 JIS B2081-1999 JIS B2082-1999 BS 1873-1999 MSS-SP-42-1999 GB/T 12235-1989 BS 5160-1989
Bellows Sealed Globe Valve	1. Flow path: angle type, straight-through, direct current (Y type) 2. Connection between valve body and bonnet: flange 3. Connection end: flange or butt welding 4. Various types of discs can be used, It is usually an exposed stem, but there are also a few valves with smaller diameters that use double stem seals with concealed stem 5, bellows and packing	ASME B16.34-1996
Angle type high pressure globe valve	1. Flow path: angle type 2. Connection between valve body and bonnet: thread, clamp or welding 3. Various types of discs can be used. For ultra-high pressure valves, internal pressure self-balancing discs are usually used 4. The valve body can adopt integral type, two-piece type 5. Connection end: flange or butt welding	ASME B16.34-1996 GB/T 12235-1989
Lining stop valve	1. Flow channel: angle type, straight-through, direct current (Y type) 2. Connection between valve body and bonnet: flange 3. Connection end: flange or butt welding 4. Lining material is rubber, plastic, etc.	ASME B16.34-1996
Two-way three-way globe valve	1. Flow path: two-way three-way flow path 2. Connection between valve body and bonnet: flange 3. Connection end: flange or butt welding	ASME B16.34-1996
Cast steel discharge stop valve	1. Flow path: straight-through 2. Connecting end: flange 3. Disc: upward or downward expansion 4. Connection between valve body and bonnet: flange	ASME B16.34-1996
Three-way globe valve	1. Flow path: Tee 2. Connecting end: Flange 3. Disc: Plane seal	ASME B16.34-1996
Pressure gauge shut-off valve	1. Flow path: DC, right angle, three-way 2. Connection between valve body and bonnet: integral forging or thread 3. Connection end: external thread, clamp 4. Disc: Cone and flat	ASME B16.34-1996
Water seal stop valve	1. Flow path: DC 2. Connection end: socket welding, butt welding 3. Valve body and bonnet: both forged, with a chromium nickel steel or carbon steel 4. Disc: Cone seal (DN10~25mm) , Plane seal (DN32~200mm)	E101-1999 GB/T 12235-1999 ASME B16.34-1996
Slurry shut-off valve	1. Flow path: DC 2. Connection end: Flange 3. Valve body structure: The valve seat is clamped between the left and right valve bodies, and the left and right valve bodies are connected by bolts. 4. The valve body and the bracket are connected by bolts. 5. The valve cover: CL150 is forged as a whole, CL300 and CL400 are split type, using strut connection. 6. Disc: Cone surface is sealed into plane seal, or throttle type sealing surface is overlaid with hard alloy	GB/T 12235-1989 ASME B16.34-1996
Angle globe valve	1. Flow path: right angle 2. Connection end: flange 3. Valve body and bonnet: forged throttling type. The sleeve is drilled and the piston moves up and down in the sleeve to adjust the flow. 4. Valve body, valve Cover connection: bolt connection	API 6A-2002
Titanium Globe Valve	1. Flow path: straight-through 2. Valve body, bonnet, stuffing box, valve clack, valve stem are made of titanium 3. Valve body and bonnet connection: bolt connection 4. Valve clack is flat seal	GB/T 12235-1989

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

Schematic diagram of electric ball valve structure

July 14, 2021

The electric ball valve has a simple structure and is composed of a few parts. It has the advantages of small size, light weight, small installation size, small driving torque, easy operation and agility, and it can be quickly opened and closed only by rotating 90°. It has a good flow regulating effect and sealing characteristics; in the application range of large and medium caliber, medium and low pressure, the electric ball valve is one of the leading valves, and it is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. When the electric ball valve is fully opened, there is no resistance when the medium flows through the ball core port, so the pressure drop that occurs through the valve is very small, so it has better flow control characteristics.

O type ball valve O shaped ball core

Electric ball valve structure: There are many types of electric ball valves, which are generally divided into two categories according to different structural forms, namely O-shaped structure and V-shaped structure. The valve ball openings of the two are different, and the application is also different. O-type is generally suitable for shutting off. Use, occasionally adjust, but V-type is more suitable for adjustment (large adjustable ratio).

O-type ball valve structure:
The O-shaped ball valve is equipped with a ball with a middle through hole inside the valve body. A through hole with the same diameter as the pipe diameter is opened on the ball. When it is fully opened, it is a non-block valve with a large flow capacity and no directionality when fluid enters the valve. The sphere can rotate in the sealing seat, and there is a ring-shaped elastic body on both sides of the pipeline direction 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. ,

V-shaped ball valve structure:

V type ball valve, V-shaped ball core

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. With the rotation of the ball, the opening area changes, but the shape of the opening surface is always triangular, and the flow characteristics are similar. Percentage, the adjustable ratio is large. It has the characteristics of large flow capacity, large adjustable range, shearing force, and tight closing. It is especially suitable for working conditions where fluid materials are fibrous. Generally, V-type ball valves are single-sealed ball valves. Not suitable for bidirectional use.
Related knowledge: The difference between O-shaped ball valve and V-shaped ball valve
Related products: Electric V-shaped ball valve Pneumatic O-shaped 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

bellows globe valve structure and features

July 9, 2021

Bellows globe valve structure (picture), the function and characteristics of bellows globe valve
Bellows globe valve structure:
Bellows cut-off valve is mainly filled with a bellows seal. The upper part of the outer surface of the bellows is welded to the valve body to form a closed space in which the liquid is contained. The valve stem is inserted into the bellows, and the bottom of the bellows is connected to the valve core. The expansion and contraction of the bellows controls the opening of the valve core. Therefore, if the bellows does not crack, there can be no leakage. The bellows has a very high sealing reliability and can be used in toxic media or gases. Such as chlorine. Prevent leakage.

Globe valve (9)

Structural characteristics of bellows globe valve:
1. Double sealing design (bellows + packing) If the bellows fails, the stem packing will also avoid leakage and meet international sealing standards
2. There is no fluid loss, reducing energy loss and improving plant equipment safety
3. Long service life, reduce maintenance times and lower operating costs
4. Rugged and durable bellows seal design to ensure zero leakage of the valve stem and provide maintenance-free conditions
5. The gas medium valve seat adopts PTFE soft sealing material to improve the sealing performance of this valve
6. High temperature resistance≤425℃The valve seat adopts conical hard seal. Achieve airtight performance and zero leakage

The function of the bellows globe valve:

The function of the bellows in the globe valve is to seal and prevent the medium from leaking from the valve stem. The lower end of the bellows and the valve stem are connected by sealing welding, the upper end and the gland are connected by sealing welding, and the gland is connected with the upper Metal spiral wound gaskets are generally installed between the flanges to ensure sealing. The bellows shut-off valve is extremely tight and rarely leaks.

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

Structural characteristics & features of flanged butterfly valves

July 8, 2021

The basic knowledge and structural characteristics of flange butterfly valves:
The flanged butterfly valve has introduced a self-sealing design concept, in which the connection between the disc and the valve shaft adopts a patented pull-out pin structure. The main features of the valve are reliable sealing, bi-directional sealing, and tight connection without loosening, so that the valve can be used for a long time. Its characteristics are as follows:

Double flange butterfly valve (16)

Two-way sealing
Generally, traditional butterfly valves cannot be sealed well under the working pressure in the opposite direction (not conducive to the sealing direction) due to their structural reasons. At present, the relevant national standards do not have mandatory regulations for two-way sealing. This is because:
1. Adopting the self-sealing design concept. The disc sealing ring is directly embedded in the disc in a zigzag shape with rubber, and there is no need to use pressure rings or bolts to fix, thus avoiding the uneven force of the sealing ring caused by the traditional bolt pressure plate type seal, which makes the bolts The problem of falling off and premature damage to the sealing ring. Under the action of the working pressure in the opposite direction, the sealing ring generates self-sealing force, which increases the specific pressure of the seal. The sealing ring compresses the valve seat. The greater the working pressure in the opposite direction, the greater the self-sealing force, so that the sealing ring and the valve seat The combination is tight to achieve the effect of two-way sealing.

triple offset butterfly valve-double flange- (4)

2. The disc has good rigidity and is not easy to deform. The disc of butterfly valve above DN300 is a double-plate truss flow-through structure, with small flow resistance and good rigidity. Under the working pressure in the opposite direction, it is not easy to deform, so that the sealing ring will not follow the disc Deformed and separated from the best sealing point of the valve seat, thus ensuring the sealing effect of the sealing ring.
3. Long life of rubber sealing ring
(1) Due to the self-sealing design concept, the small interference between the rubber ring and the stainless steel valve seat only maintains the initial seal, so the specific pressure required for the seal increases with the increase of the system pressure.
(2) In addition, there is a so-called “breathing” groove for rubber elastic retreat in the zigzag groove, so that the rubber has a certain expansion space when it is under pressure, so that it will not produce elastic fatigue during long-term work, so it is sealed The life of the ring is greatly increased compared with the traditional type.
Patent design withdrawal pin structure
Usually in the process of using the butterfly valve, due to the traditional pin connection, the pin passes through the center of the valve shaft, which not only reduces the strength of the valve shaft, but also creates a gap between the valve shaft and the valve shaft during long-term use, which will cause an impact when the valve is opened and closed. Load, this load is much greater than the load generated by the extrusion stress and shear stress under normal conditions. Often the pin is severely deformed or broken during use, which makes the valve closed or fails, and greatly reduces the valve Service life. If the newly produced valve adopts the US patent design withdrawing pin structure to replace the pin connection structure between the shaft and the valve disc, the withdrawal pin does not pass through the center of the valve shaft, not only does not weaken the strength of the shaft, but also connects with the valve shaft. The fitting surface is greatly increased. By tightening the withdrawal pin nut, a pre-tightening force is generated between the withdrawal pin and the valve shaft joint surface, so that the disc valve shaft is tightly combined without gaps, and it will not be used when opening and closing the valve. The impact load is generated, so that the valve flap rotates smoothly, thereby realizing reliable sealing.
Unique design of the bottom axial adjustment and locking device
In butterfly valves above DN300, considering the reliability of the self-weight seal of the butterfly plate, the position of the disc on the valve seat is in the best sealing state through precise adjustment and fixation of the axial position during manufacturing. For the sagging of the valve clack that may be caused during long-term use, it is also convenient to further adjust the lock to achieve zero leakage in long-term use.
Easy to replace the sealing ring
When the sealing ring needs to be replaced, there is no need to remove the disc, just open the valve fully, and then take out the key from the operating device, after the operating device is adjusted to the closed state, it still maintains the key connection with the main valve, and then continues in the opening direction Turn the hand wheel until the sealing ring is on the side of the valve body sealing surface to replace the sealing ring.
Related knowledge: the principle of butterfly valve structure
Related products: Electric flanged butterfly valve Pneumatic flanged 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

structures and differences of Non-rising stem(NRS) and rising stem(RS) gate valve

July 8, 2021

structures and differences of Non-rising stem(NRS) gate valve and rising stem(RS) gate valve
RS gate valve structure picture, NRS gate valve structure picture

rising stem gate valve-OS&Y

RS gate valve and NRS gate valve are different from the transmission mode. RS gate valve is a handwheel that drives a nut to rotate in place, and the stem is linearly raised and lowered to complete the switch; NRS gate valve is a handwheel that drives the stem to rotate, and there are threads in the gate. Nut) to move up and down to complete the switch.

Structural principle of gate valve:
1. NRS gate valve structure: The stem nut is in the valve body and is in direct contact with the medium. When opening and closing the gate, it is realized by rotating the valve stem.
2. RS gate valve structure: the stem nut is on the bonnet or bracket. When opening and closing the gate, the stem nut is rotated to realize the lifting of the stem.
The difference between RS gate valve and NRS gate valve:
1. RS gate valve can see the screw, but NRS can not see the screw;
2. The RS gate valve raises or lowers the disc through the threaded transmission of the valve stem and the steering wheel; when the NRS gate valve is switched on and off, the steering wheel and the valve stem are connected and relatively immobile. It drives the valve through the rotation of the valve stem at a fixed point. The flap is lifted up and down to complete the opening and closing;

non-rising-stem-gate-valve-IS&Y

3. The transmission thread of the NRS gate valve is located inside the valve body. During the opening and closing process, the valve stem only rotates, and the gate is raised and lowered in the valve body; the valve stem of the RS gate valve drives the gate to rise and fall together, and the drive thread on the valve stem Outside the valve body, the opening and closing and position of the gate can be intuitively judged according to the movement direction and position of the valve stem;
4. The height of the NRS gate valve is small; the RS gate valve requires a larger installation space;
5. The structure of the RS gate valve is beneficial to the lubrication of the valve stem, and the degree of opening and closing is obvious; the thread of the valve stem of the NRS gate valve is not only unable to be lubricated, but it is directly corroded by the medium and is easily damaged. Therefore, the RS gate valve is more widely used.

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 principle, structure and working principle

July 7, 2021

Principle of Pneumatic Ball Valve|Structure, Principle of Pneumatic Ball Valve
Pneumatic ball valve is a combination of pneumatic actuator and ball valve, instead of manual operation, not only saves a lot of manpower and material resources, but also can control multiple ball valves at the same time. The actuator work of the pneumatic ball valve drives the valve body to open and close quickly, and the speed can achieve the effect of cutting off within seconds. The execution speed of pneumatic actuators is relatively fast, the fastest switching speed is 0.05 seconds/time, so it is usually called pneumatic fast cut-off ball valve.

pneumatic ball valve

The pneumatic actuator of the pneumatic ball valve is mainly divided into single-acting and double-acting. The pneumatic head is equipped with accessories such as triple pieces, positioners, limit switches, etc., which can be used as a throttle to adjust the flow. At the same time, the control box can be added to control the switch in the remote control room.

Working principle of pneumatic ball valve:
The pneumatic ball valve only needs to enter the pneumatic actuator through compressed air, the air source drives the ball core to rotate 0-90 degrees and the small turning torque can control the switch of the ball valve. The valve positioner can be assembled according to the working conditions to control the ball valve. The opening of the core is used to adjust the medium flow. The sphere rotates around the centerline of the valve body to achieve opening, with a circular through hole or channel passing through its axis. When the center of the ball rotates to 90°, the valve is in a tightly closed state. When the actuator is working, the valve can be tightly closed with only a small torque, so that the principle of rapid cut-off can be achieved.

pneumatic V type ball valve

Pneumatic ball valve structure classification:
Pneumatic ball valves can be divided into on-off type pneumatic ball valves and regulating-type pneumatic ball valves according to the difference in structure. The on-off type has only two actions of opening and closing, while the regulating type can control the flow rate!
1. The valve core of the on-off pneumatic ball valve is generally an O-type ball core, and the O-type ball valve spool is a floating precision casting. The diameter of the flow channel is the same as that of the pipeline, and it is mainly used as a cut-off switch.
2. The valve core of the adjustable pneumatic ball valve is a V-shaped ball core, which adopts a fixed structure, with a V-shaped cut on the ball core. Adding a positioner to the actuator can realize the proportion adjustment of fiber-containing and granular media.

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 installation instructions

July 5, 2021

Pneumatic ball valve installation instructions
Before installing the pneumatic ball valve:
1. Ensure that the installation position of the pneumatic ball valve is that the pipeline is in a coaxial position. The two flanges on the pipeline should be kept parallel. Confirm that the pipeline can bear the weight of the pneumatic ball valve.

pneumatic ball valve

2. Confirm whether there are impurities, welding slag, etc. in the pipeline, and the pipeline must be purged.
3. Check the nameplate of the pneumatic ball valve, and perform full-open and full-close operations several times to confirm that the valve can work normally, and then check all the details of the valve thoroughly to ensure that the valve is intact.
4. Remove the protective covers at both ends, check whether the valve body is clean, and clean the inner cavity of the valve body. Since the sealing surface of the pneumatic ball valve is spherical, even tiny debris may cause damage to the sealing surface.

Installation of pneumatic ball valve:
1. Install a gasket between the pneumatic ball valve flange and the pipeline flange according to the pipeline design requirements.
2. The bolts on the flange should be tightened symmetrically, successively and evenly.
3. When the ball valve adopts a pneumatic actuator, complete the installation of the air source according to the instructions.
4. Any section of the pneumatic ball valve can be installed at the upstream end, and the handle pneumatic pipe ball valve can be installed at any position of the pipeline. If the ball valve of the electro-pneumatic actuator is configured, it must be installed vertically, and the inlet and outlet of the valve are in a horizontal position.
Inspection after installation of pneumatic ball valve:
1. After installation, start the pneumatic ball valve to open and close several times, it should be flexible, uniform force, and the pneumatic ball valve should work normally.
2. According to the design requirements of pipeline pressure, test the sealing performance of the joint surface of the pneumatic ball valve and the pipeline flange after pressure is applied.

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

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

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