Pneumatic ball valve is the ball valve with pneumatic actuators, pneumatic actuators of relatively fast speed, the fastest switching speed of 0.05 seconds/time, so usually also called pneumatic quick cut off the ball valve.Pneumatic ball valve is usually with various accessories, such as solenoid valve, air filter, limit switch, locator, control box, etc., in order to realize the local control and remote centralized control, in the control room can control the switch of the valve, do not need to run to the field or high altitude and dangerous manual control, to a great extent, save the human resources and time and safety.


 
Pneumatic ball valve working princile:
Pneumatic ball valve can be closed tightly with only a 90-degree rotation of the air source using pneumatic actuators and very little torque.Completely equal body cavity for the medium to provide little resistance, through the flow.It is generally considered that the ball valve is most suitable for direct open and close use.The main characteristic of the ball valve is its compact structure, easy to operate and maintain, suitable for water, solvent, acid and natural gas and other general working medium, but also suitable for working conditions of poor medium, such as oxygen, hydrogen peroxide, methane and ethylene.The ball valve body may be integral or modular.

Pneumatic ball valve Classification:
(1) trunnion mounted pneumatic ball valve:
The ball of the pneumatic ball valve is fixed and does not move after compression.Fixed ball and ball valves are equipped with floating seats, which, subject to medium pressure, cause the seat to move so that the sealing ring is pressed tightly on the ball to ensure the sealing.Bearings are usually mounted on the upper and lower shafts of the spheroidal valves, with small operation twist, 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 sealing ball valve has appeared, both in the seal between the injection of special lubricating oil, in order to form a layer of oil film, that is, to enhance the sealing, and reduce the operating torque, more suitable for high pressure large
diameter ball valve.

(2) Floating pneumatic ball valve:
The ball of the pneumatic ball valve is floating, under the action of medium pressure, the ball can produce a certain displacement and press on the sealing surface of the outlet end, to ensure that the outlet end is sealed.
The floating pneumatic ball valve has a simple structure and good sealing, but the ball bears all the load of working medium to the outlet sealing ring, so 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 low and middle pressure ball valves.