How is the pneumatic ball valve installed? Can the pneumatic ball valve be installed vertically?

The pneumatic ball valve can be installed vertically. Generally, the installation on the pipeline can be divided into parallel installation and vertical installation, which is based on the actual situation of the customer. However, we suggest that the parallel installation is generally the best, which is convenient for maintenance and very beautiful. But in many special cases, the pneumatic ball valve can also be installed vertically. Because the customer said that there is not enough space for parallel installation of pipes, then install them vertically, which will not affect the service life.

Pneumatic ball valve seal generally has four seal components: stem seal ring, middle seal ring, two seal rings on both sides.

Valve stem seal ring refers to the seal ring where the valve stem operates, generally PDFE and flexible graphite are used for more than two; intermediate seal ring refers to the seal connecting the valve body in the middle, generally PDFE and graphite metal composite gasket are used for more than two; two side seal rings are: the inlet and outlet seal rings on both sides of the ball core, generally PDFE and ppl seal (high temperature resistant seal ring).

Pneumatic ball valve includes two main parts: actuator and valve. There are two kinds of actuators: single acting and double acting.

So how to make your pneumatic ball valve buy over and easy to use and long life?

This is based on the customer’s field use to determine the life of your pneumatic ball valve. The way to extend the service life of pneumatic ball valve is to first keep the air source stable on site. A stable air source can directly affect the opening and closing speed of your valve and the service life of the valve sealing ring. It is better to install a two-way piece on each actuator. This two-way piece can not only provide stable air pressure, but also regularly oil the cylinder, and also discharge the moisture in the air to make the cylinder The service life is greatly improved. The service life of the valve is determined by the medium used on site.

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Ⅰ. Check that the pneumatic ball valve is in the full open position

After grease injection, check whether the ball port of the valve lines up with the plane of the inner cavity of the valve seat. If there is any difference, adjust the open limit bolt on the actuator to ensure that the valve is fully open. Otherwise, it is unable to judge whether the valve is fully open once the pneumatic ball valve is assembled.

Ⅱ. Unable to inject grease into the pneumatic ball valve

1. When the valve shaft (rod) is greased, the sealing pressure in the pneumatic ball valve shaft (rod) shall not exceed 20.68mpa. Once it exceeds, check whether the grease gun is faulty and whether the outlet valve at the grease outlet of the grease gun is opened.

2. If there is no grease gun failure, check whether the grease nozzle is blocked, that is, slowly unscrew the grease nozzle and install it at the grease outlet hole of the grease gun. Observe whether the grease nozzle can discharge grease by injecting grease into the grease nozzle. If it does not discharge grease, it indicates that the one-way valve in the grease nozzle has fault, and the grease nozzle should be replaced.

If the grease injection nozzle can discharge grease, check the one-way valve located in the grease injection hole at downstream side of the grease injection nozzle (generally, this one-way valve is installed in the imported valve grease injection hole ), and screw it out with special tools for inspection. Any blockage such as raw material belt shall be removed, and the valve shall be replaced if there is serious fault. If it is still unable to inject grease, it shall be reported to the professional engineer and on-site supervisor for on-site solution by the manufacturer.

Ⅲ. Uneven grease injection from grease injection hole of pneumatic ball valve

After the grease injection of pneumatic ball valve, the blocking may occur in the valve seat sealing grease injection pipe, resulting in uneven or no grease discharge from the grease injection hole of the valve seat. This situation requires a 15°~ 25° turn from the fully open position. Then look into the grease outlet hole of the valve seat, gently dredge it with a soft tool, and continue to observe the grease injection.

Special attention shall be paid to the fact that grease shall not be injected during the rotation of the pneumatic ball valve to avoid damaging the seat seal. Generally, there are 4 nozzle’s grease injection at each side of the ball valve are even, while 2 are relatively uneven.

Our company focuses on manufacturing wedge gate valve, pipeline gate valve, floating ball valve, fixed ball valve, top mounted ball valve, stop valve, swing check valve, double plate check valve and forged valve. If you have any needs, please feel free to consult us.

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Structure of pneumatic ball valve

The structure of pneumatic ball valve is composed of pneumatic actuator (single and dual action, AW and GT type) and ball valve. After the compressed air enters the cylinder, it pushes the piston to rotate, and then drives the opening and closing of the ball valve through the connecting shaft, so as to achieve the function of cutting off and adjusting the medium. The speed of pneumatic actuator is relatively fast, and workers do not need to do it by themselves, which saves labor cost and time to a large extent.

Pneumatic ball valve is evolved from check valve. It has the same 90 degree rotation lifting action. The difference is that the plug body is a sphere with a circular through hole or passage through its axis. The ratio between the sphere and the channel port should be that when the sphere rotates 90 degrees, the sphere should appear at the inlet and outlet, so as to cut off the flow. This kind of valve can be installed at any position in the pipeline. It has functions of adjustment (with positioner), opening and closing(optional accessories). There are many kinds of ball valves. According to the different connection methods and materials, the classification is also different. It will be introduced in the article.

Type of cylinder

AW type cylinder is cast iron cylinder, which is commonly used for valves with large output torque. GT type cylinder is anodized on the surface, which is resistant to weak acid and alkali. It is commonly used. The pneumatic ball valve can be closed tightly only by the operation of air rotation of 90 degrees and small rotation torque. The completely equal inner cavity of the valve body provides a small resistance and straight passage for the medium. It is generally believed that the ball valve is most suitable for opening and closing directly. However, in recent development, ball valve has been designed for throttling and flow control.

Function form of cylinder:

The single function here refers to the cylinder with spring return. When the air and power are cut off, the valve is reset by the spring in the cylinder to close or open the valve. (normally closed or normally open. It is optional). Dual action means that the cylinder is opened and closed by compressed air.

Application of pneumatic ball valve

Working principle of pneumatic ball valve: make the valve unblocked or blocked by rotating the valve core. Pneumatic ball valve has light switch, small size, and it can be made into a large caliber. It has the advantages of reliable sealing, simple structure and convenient maintenance. Sealing surface and spherical surface are often in closed state, and it is not easy to be eroded by medium, so they are widely used in various industries.

Pneumatic ball valve and plug valve are the same type of valve. Only its closing part is a ball, which rotates around the center line of the valve body to open and close the valve.

Pneumatic ball valve is mainly used in pipeline to fast cut off, distribute and change the flow direction of medium.

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Working Principle and Application of Pneumatic Ball Valve

Pneumatic ball valve is evolved from plug valve. It has the same 90 degree rotation action. The difference is that the plug body is a sphere with a circular hole or passage through its axis. Its working principle is to make the valve unblocked or blocked by rotating the valve core.

Pneumatic ball valve has light switch, small in size, and it can be made into a large caliber. The seal is reliable, the structure is simple, the maintenance is convenient, and the sealing surface and the spherical surface are often in a closed state. It is not easy to be eroded by the medium, so it is widely used in various industries. Pneumatic ball valve and plug valve belong to the same type of valve, but its closing part is a ball. The ball rotates around the center line of the valve body to open and close.

The pneumatic ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline.

Advantages of Pneumatic Ball Valve

• 1. The fluid resistance is relatively small, and the resistance coefficient is equal to the pipe section of the same length.
• 2. Simple structure, small volume, and lightweight.
• 3. It is tight and reliable. At present, the sealing surface material of ball valve is widely used in plastic, with good sealing performance, and also widely used in vacuum systems.
• 4. It is easy to operate and it can be opened and closed fast. It only needs to rotate 90° from full open to full close, which is convenient for the remote control.
• 5. The maintenance is convenient, the structure of pneumatic ball valve is simple, the sealing ring is generally movable, and the disassembly and replacement are relatively convenient.
• 6. When the valve is fully open or closed, the sealing surface of the ball and the valve seat shall be isolated from the medium. When the medium passes through, the corrosion of the valve sealing surface will not be caused.
• 7. It can be widely used, ranging from several millimeters to several meters in diameter, from high vacuum to high pressure.
• 8. The power source of pneumatic ball valve is gas, generally 0.2-0.8mpa pressure, which is relatively safe. If the pneumatic ball valve leaks, the gas can be discharged directly compared with the hydraulic and electric ones, which has no pollution to the environment. It is of high safety.
• 9. Compared with the manual and turbine ball valves, the pneumatic ball valve can be configured with large caliber. (the manual and turbine ball valves are generally under DN300 caliber, and the pneumatic ball valve can reach DN1200 caliber at present.)

Pneumatic ball valve has been widely used in petroleum, chemical industry, power generation, papermaking, atomic energy, aviation, rocket, and other departments, as well as people’s daily life.

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A pneumatic aluminium alloy ball valve is evolved from a plug valve. It has the same 90-degree rotation action, the difference is that the plug body is a sphere, with a circular through hole or passage through its axis. The ratio between the sphere and the passage port should be such that when the sphere rotates 90 degrees, the sphere should be present at the inlet and outlet, so as to cut off the flow. This kind of valve can be installed at any position in the pipeline.

A pneumatic ball valve is equipped with a pneumatic actuator. The pneumatic actuator is relatively fast in execution, with the fastest switch speed of 0.05s/time, so it is also called pneumatic quick cut-off ball valve. A pneumatic ball valve is usually equipped with various accessories, such as solenoid valve, gas source processing triplet, limit switch, positioner, control box, etc., to achieve local control and remote centralized control, and the valve can be controlled in the control room.

The working principle of the pneumatic aluminium alloy ball valve is as follows:

• 1. When the pneumatic actuator is connected with the circuit and system air source, the air enters the cylinder a (cylinder b) through the pipe a or B to push the piston to move towards one end, so as to drive the rotating shaft and the ball core to rotate 90 °.
• 2. The top of the pneumatic actuator is connected with the visualizer. When the green mark points to the “on” word, it indicates that the valve is open.
• 3. When the green light of the annunciator is on, the valve is in the open position, and when the red light is on, the valve is in the closed position.
• 4. The positioner can adjust the flow of valve pipeline 5. The valve seat adopts elastic sealing structure, reliable sealing and easy opening and closing.
• 6. The valve rod adopts the bottom-mounted structure with a back seal, and the valve rod will not be impacted when the valve cavity is abnormally pressurized.
• 7. The pneumatic piston actuator is made of low friction material into the bearing sleeve, and the inner and outer surfaces of the cylinder block are treated with hard anodizing anti-corrosion treatment, greatly improving the service life of the cylinder.

Pneumatic aluminum alloy ball valve is widely used for fluid control or regulation control in natural gas, oil, chemical industry, metallurgy, papermaking, electric power, mining, printing and dyeing, biopharmaceutical, daily chemical industry, food and beverage, water treatment, air treatment and other industries, matching with automatic pneumatic instruments.

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Ⅰ. Pneumatic forged steel ball valve main applications

Pneumatic forged steel ball valves are widely used in petroleum, natural gas, medicine, food, hydropower, nuclear power, drainage, heating, metallurgy, and other industries. They are vital mechanical products for national defense construction.

Pneumatic forged steel ball valve has many advantages. The ball valve has vital functions, large circulation capacity, light weight, small size, reliable performance, remote control, etc. It is a good product for throttling, through-transfer and can regulate the flow.

Pneumatic forged steel ball valve sealing performance is also particularly strong. It can be divided into two forms: resilient seal and metal seal. A resilient seal valve means that the seal of the electric ball valve can be attached to the valve. And service life of metal seal form of the valve in general will be much longer than the resilient seal type of valve. Excellent sealing ability can well block the entry of air and maintain the internal sealing. That’s why many companies choose to use it in industrial automation.

Pneumatic forged steel ball valve is evolved from the plug, its opening and closing member is a ball, the use of the ball around the axis of the stem rotation 90° to achieve open and close. Pneumatic forged steel ball valve in the pipeline is mainly used to cut off, change the direction of media flow.The V-shaped opening of the ball valve also has a good flow regulation function.

The pneumatic forged steel ball valve has  a simple structure, good sealing performance, and smaller volume in a certain nominal diameter range, light weight, less material consumption, small installation size, and small driving torque. It is easy to operate to achieve rapid opening and closing.

Ⅱ. The characteristics of pneumatic forged steel ball valve

• 1. A locking hole is provided in the valve’s fully open and fully closed position to prevent misoperation by non-staff.
• 2. Set up steps in the lower part of the valve stem, in case of the valve internal pressure abnormal rise off the stem.
• 3. A fire-resistant sealing ring between the ball and the valve seat. The burned valve seat is still has a sealing role.
• 4. Rapid switching, flexible opening and closing, long service life, safe and reliable.
• 5. Pneumatic forged steel ball valves can be controlled centrally from a distance, and can meet the needs of computer program control.
• 6. The fluorine plastic lining layer of the ball valve, with chemical stability, is suitable for any strong corrosive chemical media.
• 7. The use of full-pass floating ball valve structure, leak-free closure in the entire pressure range. It is convenient for the pipeline system to sweep the line and maintain the pipeline.

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I. Overview of Pneumatic Ball Valve

Pneumatic ball valve is a ball valve equipped with a pneumatic actuator, the execution speed of which is relatively fast with the fastest switching speed of 0.05 seconds / time, so it is also referred to as pneumatic quick cut-off ball valve.

Basically, the pneumatic ball valve employs magnetic valve, air source treatment triplet, limit switch, positioner, control box and other fittings to realize local control and remote centralized control. It allows the valve to be opened and closed in the control room without manual operation at the site or at high altitude and dangerous areas, which saves time and human resources, and improves safety to a great extent.

II. Classification of Pneumatic Ball Valves

1. Trunnion Mounted Ball Valve

The ball of pneumatic ball valve is fixed and will not move after pressure acts on it. While the floating valve seat it employs will move under the medium pressure to allow the sealing ring being pressed in tight against the ball to ensure seal. Equipped with bearings on the upper and lower shafts with low operating torque, fixed ball is suitable for high-pressure and large-diameter valves.

In order to reduce the operating torque of pneumatic ball valve and increase the reliability of sealing, oil sealed ball valve appears, that is, special lubricating oil is injected between sealing surfaces to form an oil film, which not only enhances the sealing performance, but also reduces the operating torque, which is more suitable for high-pressure and large-diameter ball valves.

2. Floating Ball Valve

The ball of pneumatic ball valve is floating. The medium pressure acts upon the ball and the ball moves with a certain displacement and is pressed tightly on the sealing surface of the outlet end to ensure its sealing.

The floating pneumatic ball valve has simple structure and good sealing performance, but all the load of the working medium borne by the ball is transmitted to the outlet sealing ring. Therefore, it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. This structure is widely used in medium and low pressure ball valves.

3. Elastic ball Valve

The ball of pneumatic ball valve is elastic. The ball and valve seat sealing ring are made of metal materials with large sealing pressure ratio. The pressure of the medium itself can not meet the sealing requirements, so external force must be applied. This valve is well suited for high temperature and high pressure medium.

Elasticity is attainable from an elastic groove at the bottom of inner wall of the ball. When the passage is closed, the wedge head of the valve stem permits the ball to be expanded and pressed against the valve seat tightly to achieve sealing. Loosen the wedge head before rotating the ball, and the ball will return to its original size, resulting in a small gap between the ball and the valve seat, which can reduce the friction on the sealing surface and operating torque.

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As one of the ball valves, what are the characteristics of the manual ball valve?

• 1. Wear resistance: the valve element base of hard seal ball valve is spray welded by alloy steel, so is the sealing ring. Therefore, the hard seal ball valve will not cause too much wear when opening and closing.
• 2. Good sealing performance: manual grinding is adopted. It can not be used until the valve core and the sealing ring are completely matched. So its sealing performance is relatively reliable.
• 3. Switch light: the bottom of the sealing ring uses spring as the sealing ring and valve core. Both are tightly held together, so the switch is very light when the external force exceeds the pre tightening force of the spring.
• 4. Long service life: it has been widely used in petroleum, chemical industry, power generation, papermaking, aviation, rocket, atomic energy and other departments, and also in people’s daily life. The pneumatic ball valve is of compact structure, reliable sealing, simple structure and convenient maintenance, and the sealing surface and spherical surface are always in a closed state. Therefore, it is not easy to be eroded by media, and it is easy to operate and maintain. It is more suitable for water, acid, solvent, natural gas and other general working media.

Compared with other kinds of valves, pneumatic ball valve has the following advantages: quick opening, stable and reliable, wide application, etc

• 1. The bearing of the thrust shaft reduces the friction torque of the valve rod, which makes the valve rod stable and flexible during long-term operation.
• 2. Anti static function: a spring is set between the ball body and the valve body, which can lead out the static electricity generated in the process of switching.
• 3. Polytetrafluoroethylene and other materials are of good self-lubricating property, so the friction loss with the ball is small, which also leads to the service life growth of pneumatic ball valve.
• 4. Small fluid resistance: pneumatic ball valve is actually the one with the smallest fluid resistance in all valve classifications. Even if it is a reduced diameter pneumatic ball valve, the fluid resistance is relatively small.

In the above article, you should have learned a lot about the characteristics of manual ball valve after reading. As a professional staff, for these knowledge, you need to remember them, and need to be familiar with them and at the same time use it flexibly.

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ZECO VALVE Company is MIEL’s long-term strategic partner, providing MIEL with many API 6D valves for its power plant and steel works projects, including pneumatic butterfly valve, double offset butterfly valve, stainless steel ball valve and so on.

Production Field 

Packing List:

• Wedge Gate Valve DN150-300
• Pneumatic Butterfly Valve DN100-300
• Double Offset Butterfly Valve DN100-300
• Pneumatic Ball Valve DN100-500
• Metal Seated Ball Valve DN100-300

Client Feedback:

ZECO valve can become our long-term partner, mainly because of their technical expertise and service in place, so we will be carefree after placing the order of valve until the project installation is successfully completed

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