Pneumatic ball valve is a ball valve with pneumatic actuator, and the execution speed of pneumatic actuator is relatively fast. Pneumatic ball valves are usually equipped with various accessories, such as solenoid valves, air source processing triplexes, limit switches, positioners, control boxes, etc., to achieve local control and remote centralized control. The valve switch can be controlled in the control room, without going to the site or high altitude and dangerous places for manual control, which saves human resources, time and safety to a great extent.
① Ball valve
The video shows a three-piece ball valve: one piece on the left, one piece in the middle, and one piece on the right.
The connection port is threaded, and the connection method can be customized according to the pipe diameter and thread.
The pipeline media that this stainless steel ball valve can be used for are water, liquid, gas, oil and general corrosive media.
② Handwheel mechanism
The handwheel mechanism can be manually controlled when the pneumatic valve is out of air and power to maintain normal production.
The handwheel dial shows the directions of OPEN and SHUT. The handwheel has two function switches: manual and automatic control.
When manual, reverse opening and direct closing, turn the manual disk, and the connecting shaft will also turn.
Pull the pull rod upward, lower the switch rod, and the manual control will be changed to automatic control.
At this time, turn the hand wheel, and the connecting shaft remains stationary and can only be controlled by pneumatic.
Pull the pull rod upward, the switch rod upward, and the manual control will be changed to manual control.
At this time, turn the hand wheel to directly control the opening and closing of the valve.
③ Solenoid valve
The solenoid valve is used for electric control of pneumatic opening and closing, and has low power.
There are two connection methods: plate connection and pipe connection.
There are two connection holes on the back of the pipe connection type that can be directly connected to the air inlet on the pneumatic actuator;
There are three holes at the bottom of the solenoid valve, the middle is the air inlet, and the two ends are exhaust holes.
The plate-mounted solenoid valve works by switching the air source inlet to realize the opening and closing of the valve.
It has two connection holes on the top that need to be connected to the air inlet on the pneumatic actuator through an air pipe.
According to the site requirements, it can be installed at any position.
④ Limit switch
The internal structure of the limit switch has 2 cams, 2 micro switches,
1 terminal and 1 connecting shaft.
When the cam and micro switch are closed, connecting PLC can form an electrical circuit of PLC, and the PLC circuit light is on;
When the cam and micro switch are disconnected, connecting PLC can form a circuit breaker of PLC, and the PLC circuit is off,
so as to realize the feedback of the remote position of the valve.
The lower connecting shaft is connected to the top connecting shaft of the pneumatic actuator.
According to the pneumatic actuator switch, the 90-degree open position and closed position are realized.
⑤ Pneumatic actuator
The pneumatic actuator is the power component of the pneumatic valve.
The two connecting holes on the pneumatic actuator correspond to the open position and the closed position respectively.
The piston is pushed by the air source to realize the 90-degree conversion of the pneumatic actuator to achieve the valve switch function.
The top of the pneumatic actuator is connected to the limit switch, and through the rotation of the connecting shaft,
the limit switch and the pneumatic actuator keep the switch position synchronized.
The bottom of the pneumatic actuator is connected to the valve or handwheel mechanism to keep the switch position synchronized.