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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

Electric ball valve-metal seated vs soft-seated type

July 15, 2021

What is the difference between an electric hard-sealed ball valve and an electric soft-sealed ball valve?
There are many types of ball valves, and the corresponding working conditions are different according to the structure, connection method and valve body material. However, in all types of ball valves, the sealing form is only divided into two categories: soft seal and hard seal. Since the sealing materials used are different, the performance characteristics of the products are different, so the applicable working conditions are naturally different.

electric ball valve

1. From the price point of view, compared with the electric hard-sealed ball valve, the price of the electric soft-sealed ball valve will be cheaper and the cost will be lower!
2. In terms of material, electric hard-sealed ball valves use metal seats, mostly stainless steel + cemented carbide, with high machining accuracy and process technology requirements, and a wide range of applications. They can be used in normal temperature, low temperature, and high temperature and high pressure conditions. Electric soft-sealed ball valve, the valve seat is divided into fluoroplastics, rubber, resin and other types, mostly used in normal pressure and normal temperature, normal pressure and low temperature conditions.

3. From the structural mechanism
(1) The electric soft sealing ball valve is easy to achieve better sealing effect, and is resistant to corrosion, acid and alkali; the disadvantage is that it is not resistant to high temperatures, the sealing surface is easy to wear, and the mechanical properties are relatively poor. (Used for occasions with high sealing requirements, or corrosive media, and no particles at room temperature and pressure.)
(2) Electric hard-sealed ball valve is the opposite, which can withstand high temperature, abrasion resistance, and has good mechanical properties. The disadvantage is that the sealing performance of this type of seal is poor. (Generally, it is recommended to use hard-sealed ball valves for media that contain solid particles or wear and whose temperature is higher than 250 degrees.)
4. From the level of valve leakage, hard-sealed valves: Generally, they are Class V, and can reach Class VI as high as possible. Soft-seal valve: generally VI grade. The biggest problem with soft-seal valves is poor wear resistance. After using for a period of time, if there are solid impurities in the liquid medium, the valve seat may be worn, which will increase the leakage and decrease the sealing performance.

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

Globe valve Model Compilation Instructions and Representation Method

July 14, 2021

Model Compilation Instructions for Globe Valves | Representation Method
Compilation instructions for cut-off valve model Description method of cut-off valve model Compilation instructions for cut-off valve model: Cut-off valve, also known as cut-off valve, is a forced-sealing valve. According to the domestic valve model standard, the model of the globe valve is represented by the valve type, drive mode, connection mode,

Globe valve (9)

structure form, sealing material, nominal pressure, and valve body material code. The model of the globe valve is related to the correct understanding of the globe valve product, the importance of the type selection, and the guarantee of the safety of the working conditions. Some of the codes in the following globe valve model compilation are omitted, mainly for the model description of the existing globe valve products. If the material and structure of the customized cut-off valve product changes, please select according to the valve programming method, or call for details.
Representation method of globe valve model:
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,

electric globe valve

R stainless steel 316;
Example of model compilation of globe valve:
J941H-16C Electric Flange 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. H: The sealing material is stainless steel;
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

Electric flange ball valve installation instructions

July 12, 2021

The working principle of the electric flange ball valve is to open and close the valve through the power drive and rotate the valve stem. It has the characteristics of light switch, small size, reliable sealing, simple structure and convenient maintenance. Due to the sealing surface and spherical surface of the electric flange ball valve Often in the closed state, it is not easy to be eroded by the medium, and it is widely used in various industries. As for the correct installation of the electric ball valve is related to the operating conditions of the working conditions and the safety during use, the user should understand the instructions for use.

electric V type ball valve

1. Preparation before installation
1. The front and back pipelines of the electric flange ball valve have been prepared. The front and rear pipes should be coaxial, and the sealing surfaces of the two flanges should be parallel. The pipeline should be able to bear the weight of the ball valve, otherwise the pipeline must be equipped with proper support.
2. Purge the pipelines before and after the valve to remove the oil, welding slag and all other impurities in the pipe belt.
3. Check the mark of the ball valve to find out that the ball valve is intact. Fully open and close the valve several times to verify that it is working properly.
2. Installation method and steps of electric flange ball valve
1. Remove the protective covers on both sides of the flange, and rinse and clean with the valve fully opened.
2. Check the valve hole, and then clean the valve hole. Flush and remove all accumulated impurities in the pipeline (these substances may damage the valve seat and ball).
3. During installation, please do not use the valve stem or handle (handwheel) part of the valve as a fulcrum for lifting objects to avoid collapse and other accidents.

pneumatic-electric-three way ball valve-flange-crew-T-L-type

4. Install the valve on the pipeline. This type of valve can be placed in any position and direction of the pipeline. The two ends are each fixed on a flange piece, and then flange gaskets are added between the two flange plates to fix it.
5. The pipeline near the installation point should not be drooping or bear external forces. Pipe supports or supports can be used to remove the deviation of the pipeline.
6. Finally, use bolts to align the two flange pieces with the flange holes and tighten them to make them tightly connected. (Some pipes or pipe fittings have their own flanges.)
3. Operation and use of electric flange ball valve
1. Make sure that the pipelines and valves have been flushed before operation.
2. The operation of the valve is completed by rotating the valve stem (manual or automatic control mode): when it rotates 1/4 turn (90°) clockwise, the valve is closed. When the reverse rotation is 1/4 turn (90°), the valve opens.
3. When the direction of the handle or the groove on the top of the valve stem is parallel to the pipeline, the valve is open.
4. The torsion of the valve stem will vary according to the following factors: the length of time the valve is opened and closed, the medium of the pipeline system, the pipeline pressure and the type of valve seat, etc.
Related Products: Pneumatic Flanged 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

working principle of electric globe valve

July 12, 2021

The principle of electric globe valve; The working principle of electric globe valve
Overview of electric shut-off valve:
The electric shut-off valve is equipped with an electric actuator on the basis of the shut-off valve, and the opening

electric globe valve

and closing of the valve is controlled by an electric device. The connection between the valve and the actuator adopts a direct connection method. The electric actuator has a built-in servo system, no need to be equipped with a servo amplifier, input 4-20mA signal and 220VAC power supply to control the operation. It has the advantages of simple connection, compact structure, small size, light weight, low resistance, stable and reliable action, etc. It can also be operated manually on site according to requirements, with the actuator with hands and electric switching mechanism. In addition to local operations, remote operations can also be performed.
Working principle of electric shut-off valve:
The closing principle of the electric shut-off valve is to rely on the electric thrust to rotate the valve stem, so that the sealing surface of the disc and the sealing surface of the valve seat are closely attached to prevent the medium from flowing. The electric shut-off valve only allows the medium to flow in one direction and is directional when installed. The structural length of the shut-off valve is longer than that of the gate valve, and the fluid resistance is large, and the sealing reliability is not strong during long-term operation.
1 In the closed position, the valve body is mechanically pressed by the valve stem, and the sealing surface of the valve clack is tightly pressed on the valve seat.
2 When turning the handwheel counterclockwise, the valve stem moves in the opposite direction, and the bottom angle plane makes the valve body separate from the valve seat.
3 The valve stem continues to lift, and interacts with the guide pin in the spiral groove of the valve stem, so that the valve flap starts to rotate without friction.
4 Until it reaches the fully open position, the valve stem is raised to the limit position and rotated to the fully open position.
Parameters of electric shut-off valve:
Valve material: cast iron, cast steel, stainless steel, forged steel, forged stainless steel, chromium molybdenum steel, low temperature steel.
Working pressure: 1.6-32MPa
Working temperature: -196°C-550°C
Valve diameter: DN15-DN800 Connection method: flange, wire or welding
Drive mode: electric
Applicable medium: water, oil, gas, steam, etc.
Application areas: mechanical equipment, chemical equipment, general parts, industrial equipment, water supply and drainage equipment, papermaking equipment, pharmaceutical equipment, general equipment, petrochemical equipment, power equipment, metallurgical powder equipment, mining equipment, municipal, electronic industry, 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

Installation and maintenance of electric ball valve

July 9, 2021

Installation and maintenance of electric ball valve
Electric ball valve is a kind of valve used to control the pipeline medium and can realize remote control. It is an important equipment in the current industrial automation control system. Including pneumatic ball valves, and other valves cannot be used continuously. After storage or use for a certain period of time, if you want to continue to ensure its effective work and appropriately extend its service life, maintenance and maintenance must be done.
Electric ball valve installation and maintenance:

electric ball valve

1. When the electric ball valve is closed, there is still pressurized fluid inside the valve body;
2. Before maintenance, release the pipeline pressure and keep the valve in the open position; disconnect the power or air source; separate the actuator from the bracket;
3. It is necessary to find out that the upstream and downstream pipelines of the electric ball valve have indeed been relieved of pressure before the disassembly and decomposition operations can be carried out;
4. 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;
5. The bolts on the flange must be tightened symmetrically, gradually and evenly during assembly;
6. 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 the metal parts. Clean non-metal parts with pure water or alcohol;
7. The decomposed individual parts can be cleaned by dipping. Metal parts with undecomposed non-metal parts can be scrubbed with a clean, fine silk cloth impregnated with cleaning agent (to prevent fibers from falling off and adhering to the parts). When cleaning, remove all grease, dirt, glue, dust, etc. adhering to the wall;
8. After cleaning, the non-metal parts should be taken out of the cleaning agent immediately, and should not be soaked for a long time;
9. After cleaning, it needs to be assembled after the cleaning agent of the washed wall surface is volatilized (can be wiped with a 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;
10. New parts also need to be cleaned before assembling;
11. Use grease to lubricate. Grease should be compatible with ball valve metal materials, rubber parts, plastic parts and working medium. When the working medium is gas, for example, special 221 grease can be used. Apply a thin layer of grease on the surface of the seal installation groove, apply a thin layer of grease on the rubber seal, and apply a thin layer of grease on the sealing surface and friction surface of the valve stem;
12. Metal chips, fibers, grease (except those specified for use), dust, other impurities, foreign objects, etc., should not be allowed to contaminate, adhere or stay on the surface of the parts or enter the cavity during assembly.

Related knowledge: Pneumatic ball valve installation instructions

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

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

The role and use of the ball valve

Types and classifications of globe valve

Electric ball valve-metal seated vs soft-seated type

Schematic diagram of electric ball valve structure

Globe valve Model Compilation Instructions and Representation Method

Electric flange ball valve installation instructions

working principle of electric globe valve

Installation and maintenance of electric ball valve

bellows globe valve structure and features

Pneumatic ball valve principle, structure and working principle

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