1、19-11Accessory SchematicsThese 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.SignalAir FilterSupplyOutput 2Output 1SignalAi
2、r FilterSupplyOutput 2Output 1Schematic 19-1A:Positioner Signal-to-open, Fail-closedStandard Positioner ControlSchematic 19-1B:Positioner Signal-to-close, Fail-open19-12SupplyEBPABSupplyEBPABAir FilterAir FilterSchematic 19-2B:Four-way Solenoid, De-energize-to-open, Fail-openSchematic 19-2A:Four-way
3、 Solenoid, De-energize-to-close, Fail-closedASCO 8345 - TypASCO 8345 - TypSolenoid Operated On-OffEAEA19-13Postitoner with Solenoid OverrideSchematic 19-3A:Signal-to-open, Fail-closed, I/P 2000 SOV Signal Interrupt, De-energize-to-closeDe-energizing solenoid valve interrupts the signal to the positi
4、oner and drives the actuator to the low signalposition. 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-openSupplySOV InputAir FilterSignalOutput 2Output
5、1SupplyAir FilterSignalOutput 2Output 1SOV Input19-14Output 2Output 1231Supply231Positioner With Solenoid OverrideSchematic 19-4A:Signal-to-open, Fail-closed, Three-way Solenoid Signal Interrupt, De-energize-to-closeSolenoidASCO 8320 TYPSolenoidASCO 8320 TYPOutput 1Output 2SupplyDe-energizing soleno
6、id 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-t
7、o-openSignalSignalAir FilterAir Filter19-15Schematic 19-5A:Signal-to-open, Fail-closed, Three-way Solenoid Override, De-energize-to-close1 32SolenoidASCO 8320 TYPOutput 1Output 2SupplyAir FilterOutput 1Output 2Air Filter1 32SolenoidASCO 8320 TYPDe-energizing the solenoid blocks off the positioner ou
8、tput and vents the cylinder opposite the spring, allowing thespring to fail the valve.Soleniod must be rated for maximum supply pressure at all ports.Schematic 19-5B:Signal-to-close, Fail-open, Three-way Solenoid Override, De-energize-to-openSupplySignalSignal19-16Flow BoostersSupplyOutput 2Output 1
9、SignalSupplyAir FilterSupplyOutput 2Output 1SignalAir FilterSupplySchematic 19-6A:Signal-to-open, Fail-close, Flow BoostersSchematic 19-6B:Signal-to-close, Fail-open, Flow Boosters19-17SupplySignalPositioner with Quick ExhaustSchematic 19-7B:Signal-to-close, Fail-open, Quick Exhaust-to-openNeedle Va
10、lveSchematic 19-7A:Signal-to-open, Fail-closed, Quick Exhaust-to-closeAir FilterQuickExhaustValveSupplySignalNeedle ValveAir FilterQuickExhaustValveOutput 2Output 1Output 2Output 119-18Schematic 19-8C:Signal-to-close, Fail-open, Speed Control in Open DirectionSupplyAir FilterSignalOutput 2Output 1Ch
11、eck ValveSpeed Control ValveSpeed Control ValveCheck ValveSupplyAir FilterSignalOutput 2Output 1Speed Control ValveCheck ValveSupplyAir FilterSignalOutput 2Output 1Check ValveSpeed Control ValveSchematic 19-8A:Signal-to-open, Fail-closed, Speed Control in Both DirectionsSchematic 19-8B:Signal-to-ope
12、n, Fail-closed, Speed Control in Closed DirectionSpeed Control System19-19SupplyAir FilterOutput 1Output 2Exh* 0.062 Bleed OrificeSwitching ValveVent*DSchematic 19-9A:Signal-to-open, Fail-in-placeLock-up SystemSchematic 19-9B:Signal-to-close, Fail-in-placeLock-up Valve(Normally Closed)In CylExhCylIn
13、Lock-up Valve(Normally Closed)ABCSignal*Spring Optional* 0.062 Bleed OrificeSwitching ValveLock-up Valve(Normally Closed)*Lock-up Valve(Normally Closed)*Spring OptionalExhCylCExhSupplyInInVent*ABDOutput 1Output 2SignalAir FilterCyl19-20Volume Tank Fail-Safe SystemSchematic 19-10B:Signal-to-close, Fa
14、il-open, Volume TankSupplySignalOutput 2Output 1* 0.031 dia. Bleed Orifice23Optional Solenoid,ASCO 8320 - TypVolumeTankSupplyInExhOutput 2DCylOptional Solenoid,ASCO 8320 - TypABCVent*VolumeTankAir FilterAir FilterSchematic 19-10A:Signal-to-open, Fail-closed, Volume Tank1ExhLock-up Valve(Normally Ope
15、n)Lock-up Valve(Normally Closed)Lock-up Valve(Normally Closed)Lock-up Valve(Normally Open)DABCExhCylInInCylVent*123Cyl ExhInOutput 1Signal* 0.031 dia. Bleed Orifice19-21CylExhInInCylExh132ADBCVent*Output 2Output 1SignalSupplyAir FilterVolume Tank Fail-Safe System with BoostersCylBOutput 2SignalSuppl
16、yVent*InExhInCylExhOutput 10.031 dia. BleedOrificeSchematic 19-11B:Signal-to-close, Fail-open, Volume TankSchematic 19-11A:Signal-to-open, Fail-closed, Volume TankLock-up Valve(Normally Closed)Lock-up Valve(Normally Closed)Lock-up Valve(Normally Closed)Lock-up Valve(Normally Closed)123DAC0.031 dia.
17、BleedOrificeOptional Solenoid,ASCO 8320 - TypOptional Solenoid,ASCO 8320 - TypVolumeTankVolumeTankAir Filter19-22Schematic 19-12B:Signal-to-close, Fail-openAir SetPositionerCADActuatorSchematic 19-12A:Signal-to-open, Fail-closedAirSupply3-waySwitchingValveDCBAOutput 2InstrumentSupplyOutput 2Output 1
18、(Plugged)3-15 psi SignalActuator3-waySwitchingValveB3-15 psi SignalOutput 1(Plugged)AirSupply(Plugged)PositionerAir Set(Plugged)InstrumentSupplyAir Spring System Using Cylinder Volume19-23Schematic 19-13B:Fast-opening, Fail-openOn-Off System with Quick ExhaustSchematic 19-13A:Fast-closing, Fail-closed32QuickExhaust1231PressurePressurePressure323ActuatorActuatorQuickExhaustHigh Capacity3-way Solenoid(Normally Open)Standard3-way Solenoid(Normally Closed)Standard3-way Solenoid(Normally Closed)High Capacity3-way Solenoid(Normally Open)Pressure1 21
