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Uses and structural characteristics of pneumatic ball valves

October 21, 2020

The pneumatic ball valve is a pneumatic actuator-equipped ball valve. With the fastest operating speed of 0.05 seconds per second, pneumatic actuators operate very rapidly, so they are typically often called pneumatic fast plugging ball valves. In order to complete in-site control and remote centralized control, pneumatic actuated ball valves are normally fitted with different accessories, such as solenoid valves, air supply handling triples, limit switches, positioners, control boxes, etc., in the control room to be able to control the valve transfer, do not need to rush to the scene or high altitude and hazardous places to operate manually, in a wide range. This saves human capital, time, and security.

Pneumatic ball valves could be firmly locked by rotating at 90 degrees with a pneumatic actuator and a with very low torque. A very narrow and clear flow passage for the medium creates a perfectly similar valve body cavity. Ball valves are commonly considered to be more appropriate for direct opening and shutting.

Fluid control pneumatic ball valves are commonly used in the natural gas, gasoline, chemical and metallurgical sectors, paper manufacturing, electric, mining, printing and thinning sectors, biologics, chemical industries in everyday activities, the food industry, and beverages, in the processing and treatment of water and air.

The structural features of the series pneumatic ball valve are:

Pneumatic actuator: Adopt a new series of GT AT type pneumatic actuators, with double action and single action (spring reset), rack and pinion drive, secure and reliable; large diameter valves are chosen from the HAW type pneumatic actuator fork drive series, with appropriate structure, large output torque, double effect and single effect (spring reset); Analyse the pneumatic actuator sample of our company.

Shell structure: According to consumer specifications and realistic working conditions, the body of the fixed ball valve can be programmed as a casting structure, forging structure, and a complete welding structure. The full welding arrangement of the ball valve is primarily sufficient for submerged applications.

Unique valve seat sealing structure: To guarantee the quality of sealing, the floating ball valve adopts lip-elastic sealing ring system planning. While using a ball valve, the seat sealing structure equipped with a leaf spring will guarantee long-term and effective sealing of the ball valve at low pressure, ultra-low pressure, or vacuum. Para-polyphenyl or metal may be the seat details of low and high-temperature ball valves.

Owing to the pressure level, medium properties, and sealing conditions, fixed ball valves pick the pre-ball sealing structure, post-ball sealing structure, or pre-and post-ball double sealing structure. Para-polyphenyl or metal can be the seat data of medium and high-temperature ball valves.

Blocking and drainage: The upstream and downstream valve seats obstruct the liquid while the valve is closed, and the stagnation in the valve body cavity can be drained by the drainage system.

Automatic pressure relief structure: Whenever the pressure in the side chamber rises abnormally, in order to push the valve seat, the medium in the middle chamber will release the pressure on its own thrust, maintaining the protection of the valve lift.

Reliable sealing of the valve stem: The stem needs to adopt a reverse sealing download structure. If the medium pressure rises, the sealing force of the reverse seal increases so that effective stem sealing can be assured. Moreover, the stem will not eject while the stem is abnormally pressurized.

Fireproof structure: The ball valve may be planned as a fire safety structure depending on the operating situation and the user’s demand. The ball valve fire-resistant design follows the specifications API607 and JB / T6899. The fire-resistant construction of the ball valves can avoid certain medium leaks and avoid more fire expansion in the case of a fire that destroys the soft seal ring.

Anti-static structure: When controlling the valve, electrostatic charges from cattle will occur and collect on the ball due to contact between the ball and the valve bench. An electrostatic unit is mounted on the valve to derive the charges collected on the ball, to prevent electrostatic sparks.

Full diameter structure and reduced diameter structure: The company’s ball valve products have two sets of full-diameter and shrinkage to suit the various needs of consumers. The inner diameter of the stream and the inner diameter of the full diameter ball valve pipeline are common, which is simple to clean, whereas the weight of the ball valves of the shrinkage series is relatively light, but the flow resistance is only about 1/7 of the same globe caliber valves, so the application prospect of the ball valves of the shrinkage series is relatively wide.

Summary:

Pneumatic actuated ball valves for on-off control of air, water, oil, and other media compliant with materials of construction. The spring return valve uses air pressure to open the valve and the springs (failsafe) to shut the valve. Double acting valves use air to open the valve and air to shut the valve. Advantages of air-operated ball valves over other form valves can include: higher flow speeds, higher pressures, higher temperatures, broader media compatibility, straight-through flow direction, decreased water hammer, and use in dangerous environments.

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