Pneumatic actuator valve accessories type and selection

Pneumatic actuator valve accessories type and selection

In the process of using the pneumatic actuator valve, it is usually necessary to configure some auxiliary parts to improve the performance of the pneumatic actuator valve, or improve the efficiency of the pneumatic valve. Common accessories for pneumatic valves include: air filters, reversing solenoid valves, limit switches, electrical positioners, etc. Pneumatic technology will air filter, pressure reducing valve, oil mist three kinds of air source processing components assembled together called pneumatic triplet, used to enter the air source purification filtration and decompression to the rated air source pressure of the instrument supply, equivalent to the function of the power transformer in the circuit.

1, pneumatic valve accessories type:

Double-acting pneumatic actuator: two-position control of valve opening and closing. (Double action)

Spring return actuator: The valve automatically opens or closes when the circuit gas path is cut off or faulty. (single action)

Single electronically controlled solenoid valve: the valve opens or closes when the power is supplied, and the valve closes or opens when the power is cut off (explosion-proof type is available).

Double electronically controlled solenoid valve: the valve opens when one coil is powered, and the valve closes when the other coil is powered, with memory function (explosion-proof type is available).

Limit switch echo device: remote transmission of valve switch position signal (explosion-proof type).

Electrical positioner: According to the size of the current signal (standard 4-20mA), the medium flow regulation control of the valve (explosion-proof type).

Pneumatic positioner: According to the pressure signal (standard 0.02-0.1MPa) of the size of the valve medium flow control.

Electrical converter: converts the current signal into the air pressure signal, and is used with the pneumatic positioner (explosion-proof type).

Air source treatment triplet: including air pressure reducing valve, filter, oil mist, air source pressure regulation, cleaning, lubrication of moving parts.

Manual operation mechanism: Automatic control can be manually operated under abnormal conditions.

2, pneumatic valve parts selection:

Pneumatic valve is a complex automatic control instrument, composed of a variety of pneumatic components, users need to choose according to the control needs.

1, pneumatic actuator: ① double acting type, ② single acting type, ③ model specifications, ④ action time.

2, solenoid valve: ① single control solenoid valve, ② double control solenoid valve, ③ use voltage, ④ explosion-proof type.

3, signal feedback: ① mechanical switch, ② proximity switch, ⑧ output current signal, ④ use voltage, ⑤ explosion-proof type.

4, positioner: ① electrical positioner, ② pneumatic positioner, ⑧ current signal, ④ air pressure signal, ⑤ electrical converter, ⑥ explosion-proof type.

5, air source treatment three components: ① filter pressure reducing valve, ② oil mist.

6, manual operation mechanism

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