1. Valve positioner

Valve positioner is the main accessory of the pneumatic actuator. It is used with pneumatic actuators to improve the position accuracy of the valve, overcoming the effects of the friction and the imbalance of the media, thereby ensuring that the valve is achieved according to the signal of the regulator. Positioning correctly.

In the following cases, the positioning device must be distributed:

1. When the media is high and the pressure difference is large;
2. When regulating the valve caliber (dn> 100);
3. High temperature or low temperature adjustment valve;
4. When the movement speed of the regulating valve needs to be improved;
5. When the execution agency of standard signals and non -standard springs (springs other than 20 to 100kPa);
6. When it is used for sub -control;
7. When the valve achieves reverse movements (the gas passing and the air -on -opening conversion);
8. When the traffic characteristics of the valve need to be changed (can change the positioner cam);
9. When a springless execution agency or a piston execution agency, when the proportional actions must be achieved;
10. When operating the pneumatic execution mechanism with a telegram, the power distribution of the gas valve must be distributed.

Second, solenoid valve

When the system needs to implement program control or two -bit control, when the solenoid valve is required to use the solenoid valve, in addition to considering the relationship between the transmission, DC power supply and voltage, and frequency “Constant open” or “constant closed”. If the capacity of the solenoid valve is required to shorten the action time, it can be used side by side to use two solenoid valves or the solenoid valve as a pilot valve and a large -capacity pneumatic relay.

Third, air filtration pressure reduction valve

An attachment in the industrial automation instrument of the air filtration pressure decompression valve. The main function is to filter and purify the compressed air from the air pressure machine and stabilize the pressure on the required values. The gas supply source and voltage pressure device of cylinder, spray equipment and small pneumatic tools.

Fourth, the itinerary switch (a reply device)

The itinerary switch reflects the two extreme positions of the valve switch, and the device that indicates the signal signal at the same time. The control room can rebuild the switch status of the valve to take corresponding measures according to this signal.