Regulating valve positioner is a major attachment of pneumatic actuators, and pneumatic actuators, is used to improve the position precision of the valve, to overcome the friction of valve stem and medium the influence of unbalanced force, to ensure that the valve according to the regulator to signal to achieve the correct positioning.

The following cases, to match the locator:
1 high and medium pressure and pressure difference of age;
2, the regulator of large diameter (DN > 100);
3, high temperature or low temperature regulating valve;
4, need to improve the operation speed of regulating valve;
5, using the standard signal, the executive body of the spring operating non-standard (20 ~ 100 kpa outside of the scope of the spring);
6, used for routine control;
7, make the valve reverse action (gas closed type and open type conversion) each other;
8, when the need to change the flow characteristic of valve (CAM) can change the locator;
9, not spring
Institutions or piston actuator, to achieve proportional action;
10 to operate pneumatic actuators, electricity signal, must distribution - gas valve positioner.


Electromagnetic valve:
When the system needs to implement program control or two control, need with electromagnetic valves. When choosing solenoid valve, in addition to consider ac, dc power supply and voltage, frequency, must pay attention to the solenoid valve and control valve type, the relationship between with "normally open" or "normally closed".
If demand increase the capacity of solenoid valve, to shorten the action time, can be used with two solenoid valve or the solenoid valve as a pilot valve with large capacity using pneumatic relay combination.


Pneumatic relay:
Pneumatic relay is a kind of power amplifier, it can send pressure signal to far away places, eliminate due to the lag of signal line extension, is mainly used in the scene between the transmitter and the adjustment of the central control room instrumentation, or between the regulator and the regulator, another role is to enlarge or reduce the signal.

Converter:
Converter is divided into gas - electric converter and electric - converter gas, its function is to achieve a certain relationship between gas, electrical transformation, it is mainly used for when electricity signal control pneumatic actuators will be 0 ~ 10 ma, or 4 ~ 20 ma electrical signal conversion or 0 ~ 100 kpa gas signal is converted into 0 ~ 10 ma, or 4 ~ 20 ma electrical signal.


Air filtering pressure reducing valve:
Air filtering pressure reducing valve is one of the industrial automation instrument accessories, its main function is the compressed air which comes from air compressor filter purification and will to the desired pressure stable value, can be used for all kinds of pneumatic instrument, electromagnetic valve, cylinder, spraying equipment and small pneumatic tools for gas source and voltage stabilizer.


Self-locking valve (valve) :
Self-locking valve is a device of valve position. Pneumatic - valve failure occurs when the origin, the device can cut off the gas source signals, keep the film chamber or cylinder pressure signal in fault