调节阀几种典型气路图

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

Standard Positioner Control

Output 2Output 1SignalSupplyAir Filter

Schematic 19-1A:

Positioner Signal-to-open, Fail-closed

Output 2Output 1SignalSupplyAir Filter

Schematic 19-1B:

Positioner Signal-to-close, Fail-open

19-11

Solenoid Operated On-Off

19-12

ASCO 8345 - Typ

B

EB

APEA

SupplyAir Filter

Schematic 19-2A:

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

ASCO 8345 - Typ

BEBA

PEA

Supply

Air Filter

Schematic 19-2B:

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

Postitoner with Solenoid Override

Output 2Output 1Supply

Air FilterSignalSOV InputSchematic 19-3A:

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

Output 2Output 1Supply

Air FilterSignalSOV InputSchematic 19-3B:

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

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.

19-13

Positioner With Solenoid Override

Output 2Output 1Supply

23SignalSolenoidASCO 8320 TYP

1Air FilterSchematic 19-4A:

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

Output 2Output 1Supply

23SignalSolenoidASCO 8320 TYP1Air FilterSchematic 19-4B:

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

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.19-14

123Output 2Output 1SolenoidASCO 8320 TYPSupply

SignalAir Filter

Schematic 19-5A:

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

231SolenoidASCO 8320 TYPOutput 2Output 1Air FilterSupply

SignalSchematic 19-5B:Signal-to-close, Fail-open, Three-way Solenoid Override, De-energize-to-open

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

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

19-15

Flow Boosters

Output 2Output 1Air FilterSupply

SignalSupplySchematic 19-6A:

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

Output 2Output 1Air FilterSupply

SignalSupplySchematic 19-6B:

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

19-16

Positioner with Quick Exhaust

Output 2Output 1QuickExhaustValveSupply

SignalAir FilterNeedle Valve

Schematic 19-7A:

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

Needle Valve

Output 2Output 1QuickExhaustValveSupplySignalAir Filter

Schematic 19-7B:

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

19-17

Speed Control System

Speed Control ValveOutput 2Output 1Check ValveSpeed Control ValveSupply

SignalAir FilterCheck Valve

Schematic 19-8A:

Signal-to-open, Fail-closed, Speed Control in Both Directions

Output 2Output 1Speed Control ValveSupply

SignalAir FilterCheck Valve

Schematic 19-8B:

Signal-to-open, Fail-closed, Speed Control in Closed Direction

Speed Control ValveOutput 2Output 1Check ValveSupply

SignalAir Filter

Schematic 19-8C:

Signal-to-close, Fail-open, Speed Control in Open Direction

19-18

Lock-up System

Lock-up Valve(Normally Closed)ExhInCylSwitching ValveDABInCylExhC* 0.062 Bleed Orifice**Vent*Output 2Output 1**Spring OptionalLock-up Valve(Normally Closed)SignalSupply

Air Filter

Schematic 19-9A:

Signal-to-open, Fail-in-place

Lock-up Valve(Normally Closed)InExhCylSwitching ValveDABInCylExhC* 0.062 Bleed Orifice**Vent*Output 2Output 1**Spring OptionalLock-up Valve(Normally Closed)Supply

SignalAir Filter

Schematic 19-9B:

Signal-to-close, Fail-in-place

19-19

Volume Tank Fail-Safe System

Lock-up Valve(Normally Open)CylInExh123DABVent*VolumeTankC* 0.031 dia. Bleed OrificeCylLock-up Valve(Normally Closed)InExhOptional Solenoid,ASCO 8320 - TypOutput 2Output 1Supply

SignalAir Filter

Schematic 19-10A:

Signal-to-open, Fail-closed, Volume Tank

Lock-up Valve(Normally Closed)InCylExh123DABOptional Solenoid,ASCO 8320 - TypVent*C* 0.031 dia. Bleed OrificeCylLock-up Valve(Normally Open)InExhOutput 2Output 1SignalAir FilterSupply

VolumeTankSchematic 19-10B:

Signal-to-close, Fail-open, Volume Tank

19-20

Volume Tank Fail-Safe System with Boosters

Lock-up Valve(Normally Closed)

CylExhInD23A1CBVent*0.031 dia. BleedOrificeOutput 2Output 1Optional Solenoid,ASCO 8320 - TypCylLock-up Valve(Normally Closed)InExhSignalAir FilterSupply

VolumeTankSchematic 19-11A:

Signal-to-open, Fail-closed, Volume Tank

Lock-up Valve(Normally Closed)

CylExhInDA123CVent*0.031 dia. BleedOrificeOutput 2Output 1BCylLock-up Valve(Normally Closed)Optional Solenoid,ASCO 8320 - TypInExhSignalAir FilterSupply

VolumeTankSchematic 19-11B:

Signal-to-close, Fail-open, Volume Tank

19-21

Air Spring System Using Cylinder Volume

3-waySwitchingValveAActuatorBD(Plugged)CAir SetPositioner(Plugged)Output 2Output 13-15 psi SignalInstrumentSupplyAirSupply

Schematic 19-12A:

Signal-to-open, Fail-closed

Actuator3-waySwitchingValveD(Plugged)ABCAir SetPositionerOutput 2(Plugged)3-15 psi SignalOutput 1InstrumentSupplyAirSupply

Schematic 19-12B: Signal-to-close, Fail-open

19-22

On-Off System with Quick Exhaust

High Capacity23-way Solenoid(Normally Open)Actuator13PressureQuickStandardExhaust3-way Solenoid3(Normally Closed)12PressureSchematic 19-13A: Fast-closing, Fail-closed

Standard3-way Solenoid3(Normally Closed)12ActuatorQuickPressureExhaustHigh Capacity3-way Solenoid2(Normally Open)13PressureSchematic 19-13B:Fast-opening, Fail-open

19-23