Pneumatic valve is an actuator that uses compressed air to drive and operate the valve. Its opening and closing speed is relatively fast, and it is commonly used for quick two position cut-off. It can also be used to regulate flow. Due to its main reliance on air source for operation, it has high practicality in flammable and explosive situations, and can be used to control gases, liquids, oil products, and various corrosive media. The accessories in pneumatic valves vary greatly, and with different accessories, different control methods cannot be achieved. Users can configure the valves according to their different work needs.

1. Pneumatic triplets are the most common accessories in pneumatic valves, and their functions can be simply summarized as: filtration+pressure reduction+oil mist. The pressure reducing valve is a mandatory accessory, and any pneumatic valve with any function must be equipped. Its function is to provide a standard power supply pressure to the pneumatic valve, with a standard value of 0.4-0.7MPa.

A pressure reducing valve is a valve that reduces the inlet pressure to a desired outlet pressure by adjusting it, and relies on the energy of the medium itself to automatically maintain a stable outlet pressure.

a. The function of the dual unit (filter, pressure reducing valve) is to complete the filtration and pressure reducing functions of compressed instrument air

b. The function of the triple unit (filter, pressure reducing valve, oil mist) is to filter and reduce the pressure of compressed instrument air, and to lubricate the air.

2. Pneumatic solenoid valve, also known as directional control valve, is a necessary configuration for two-position valves that only require opening and closing action. The solenoid valve controls the opening/closing of the pneumatic valve through excitation/demagnetization. Electromagnetic valves are often used for on-off valves, which control the on-off of the air supply circuit through voltage signals to control the opening and closing of the valve. Definition: A valve that uses an electromagnet to manipulate the movement of the valve core is generally achieved by controlling the movement process of the pneumatic actuator to open and close the valve.

3. Valve limit switch, also known as travel switch, can also be called a reply device. It is a type of on-site instrument used in the automatic control system to detect the status of valves, which is used to output the opening or closing position of the valve as a signal of the switch quantity (contact), which is accepted by the program controller or sampled by the computer. After confirmation, the next program is executed. This product can also be used for important valve interlocking protection and remote alarm indication in the automation system. If you want to master the valve position status of a two position valve, the valve limit switch is an effective configuration, which is an electrical switch used to indicate and feedback the limit position of mechanical equipment movement.

4. Valve locator, which is a necessary configuration for pneumatic control valves, can control the valve at any opening position through the valve locator. It uses the valve stem displacement signal as the input feedback measurement signal and the controller output signal as the set signal for comparison. When there is a deviation between the two, it changes its output signal to the actuator to make the actuator act, A one-to-one correspondence between the displacement times of the valve stem and the output signal of the controller has been established.

Note: If the regulating valve is controlled by safety conditions, it must also be equipped with an electromagnetic valve to forcibly control the valve to be in a safe valve position in unexpected situations.