Types and selection of pneumatic valve accessories

In the process of using a Pneumatic Valve, it is usually necessary to configure some auxiliary components to improve the performance of the pneumatic valve, or improve the efficiency of the use of the pneumatic valve. Common accessories for pneumatic valves include: air filters, reversing solenoid valves, limit switches, electrical positioners, etc. In pneumatic technology, the three air source processing elements of air filter, pressure reducing valve and oil mister are assembled together, which is called a pneumatic triple piece. It is used to enter the air source to purify and filter the pneumatic instrument and reduce the pressure to the instrument to supply the rated air source Pressure is equivalent to the function of a power transformer in a circuit.

Types of Pneumatic Valve Accessories:

Double-acting Pneumatic Actuator:

Two-position control for valve opening and closing. (Double acting)

Spring-return Pneumatic actuator:

The valve opens or closes automatically when the circuit gas circuit is cut or malfunctioned. (Single acting)

Single electronically controlled solenoid valve:

The valve opens or closes when power is supplied, and closes or opens the valve when power is lost (explosion-proof versions are available).

Double electronically controlled solenoid valve:

The valve opens when one coil is energized, and the valve closes when the other coil is energized. It has a memory function (ex-proof type is available).

Limit Switch Box:

Long distance transmission of the valve’s switching position signal (with explosion-proof type).

Electrical Positioner:

Adjust and control the medium flow of the valve according to the size of the current signal (standard 4-20mA) (with explosion-proof type).

Pneumatic Positioner:

Adjust and control the medium flow of the valve according to the size of the air pressure signal (standard 0.02-0.1MPa).

Electric converter:

It converts the current signal into the air pressure signal. It is used together with the pneumatic positioner (with explosion-proof type).

F.R.L (Air Filter, Regulator Valve, Lubricator):

Air Filter (F): used to filter impurities and moisture in compressed air to ensure the cleanliness of the pneumatic system.

Regulator Valve (R): used to reduce high-pressure gas to the required pressure to ensure the normal operation of pneumatic components.

‌Lubricator (L): used to inject the right amount of lubricating oil into the pneumatic system to reduce friction and extend the life of the equipment.

These components are usually used together, called pneumatic triplex (FRL), which plays the role of purification, filtration and pressure reduction in pneumatic technology.

Manual Operating Mechanism:

Automatic control can be operated manually under abnormal conditions.

Selection of Pneumatic Valve Accessories

Pneumatic Valve is a complex automatic control instrument. It is composed of a variety of pneumatic components. Users need to make detailed selections according to control needs.

1. Pneumatic actuator:

Double acting type
Single acting type
Model specifications
Action time

2. Solenoid valve:

Single control solenoid valve
Dual control solenoid valve
Operating voltage
Explosion-proof type

Signal Feedback:

Mechanical switch
Proximity switch
Output current signal
Using voltage
Explosion-proof type

4. Positioner:

Electrical positioner
Pneumatic positioner
Current signal
Air pressure signal
Electrical converter
Explosion-proof type

5. Three Parts for F.R.L:

Filter
Pressure reducing valve
Lubricated mist device

6. Manual operation mechanism.