The positioner is the main accessory of the pneumatic actuator. It is used together with the pneumatic actuator to improve the position accuracy of the valve and overcome the influence of the valve stem friction and the medium imbalance force, thus ensuring that the valve is correctly implemented according to the signal from the regulator. Positioning.
In the following cases, the positioner should be equipped:
1. When the medium pressure is high and the pressure difference is large;
2. When the diameter of the regulating valve is large (DN>100);
3. High temperature or low temperature regulating valve;
4. When it is necessary to increase the operating speed of the regulating valve;
5. When using a standard signal to operate a non-standard spring actuator (spring range other than 20 to 100 KPa);
6, when used for split-range control;
7. When the valve is reversed (air-switched and air-opened);
8. When it is necessary to change the flow characteristics of the valve (the positioner cam can be changed);
The electromagnetic valve
When the system needs to implement program control or two-position control, a solenoid valve is required. When using the solenoid valve, in addition to the AC and DC power supply, voltage and frequency, it is necessary to pay attention to the relationship between the solenoid valve and the regulating valve. It can be used with "normally open" or "normally closed".
If you want to increase the capacity of the solenoid valve to shorten the operating time, you can use two solenoid valves in parallel or use the solenoid valve as a pilot valve in combination with a large-capacity pneumatic relay.
The solenoid valve has two three-way single electric control and double electric control electromagnetic valve; two five-way single electric control and double electric control electromagnetic valve.
converter
The converter is divided into a gas-to-electric converter and an electric-to-gas converter, and its function is to realize a mutual conversion between gas and electric signals, and is mainly used for 0 to 10 mA or 4 to when the pneumatic actuator is operated by the electric signal. 20mA electrical signal conversion or 0~100KPa air signal is converted into 0~10mA or 4~20mA electrical signal.
Air filter pressure reducing valve
The air filter pressure reducing valve is an accessory in the industrial automation instrument. Its main function is to filter and purify the compressed air from the air compressor and stabilize the pressure at the required value. It can be used in various pneumatic instruments and solenoid valves. Air supply and voltage regulator for cylinders, spray equipment and small pneumatic tools.
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