调节阀几种典型气路图

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Accessory Schematics

These drawings are helpful in determining what accessories are needed and their proper arrangement for a particular application. The following engineering schematics are used by Valtek when attaching accessories to control valves.

Standard Positioner Control

Air Filter

Schematic 19-1A:

Positioner Signal-to-open, Fail-closed

Air Filter

Schematic 19-1B:

Positioner Signal-to-close, Fail-open

19-11

19-12

Supply EB

P A B

Supply

EB P A

B Air Filter

Air Filter

Schematic 19-2B:

Four-way Solenoid, De-energize-to-open, Fail-open

Schematic 19-2A:

Four-way Solenoid, De-energize-to-close, Fail-closed

ASCO 8345 - Typ

Solenoid Operated On-Off

EA

19-13

Schematic 19-3A:

Signal-to-open, Fail-closed, I/P 2000 SOV Signal Interrupt, De-energize-to-close

De-energizing solenoid valve interrupts the signal to the positioner and drives the actuator to the low signal

position. This is dependent on the proper functioning of the positioner and the integrity of the feedback linkage.

Schematic 19-3B:

Signal-to-close, Fail-open, I/P 2000-SOV Signal Interrupt, De-energize-to-open

Supply

19-14

Supply

Schematic 19-4A:

Signal-to-open, Fail-closed, Three-way Solenoid Signal Interrupt, De-energize-to-close

ASCO 8320 TYP

Supply

De-energizing solenoid valve interrupts the signal to the positioner and drives the actuator to the low signal posi-tion. This is dependent on the proper functioning of the positioner and the integrity of the feedback linkage.Schematic 19-4B:

Signal-to-close, Fail-open, Three-way Solenoid Signal Interrupt, De-energize-to-open

19-15

Schematic 19-5A:

Signal-to-open, Fail-closed, Three-way Solenoid Override, De-energize-to-close

Supply

Air Filter

De-energizing the solenoid blocks off the positioner output and vents the cylinder opposite the spring, allowing the spring to fail the valve.

Soleniod must be rated for maximum supply pressure at all ports.

Signal-to-close, Fail-open, Three-way Solenoid Override, De-energize-to-open

Supply

19-16

Flow Boosters

Supply

Schematic 19-6A:

Signal-to-open, Fail-close, Flow Boosters

Schematic 19-6B:

Signal-to-close, Fail-open, Flow Boosters

19-17

Positioner with Quick Exhaust

Schematic 19-7B:

Signal-to-close, Fail-open, Quick Exhaust-to-open

Needle Valve

Schematic 19-7A:

Signal-to-open, Fail-closed, Quick Exhaust-to-close

Air Filter

Supply

Needle Valve