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1、19-11 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. Signal Air Filter Supply Output 2 Output 1
2、 Signal Air Filter Supply Output 2 Output 1 Schematic 19-1A: Positioner Signal-to-open, Fail-closed Standard Positioner Control Schematic 19-1B: Positioner Signal-to-close, Fail-open 19-12 ? ? ? ? ? ? Supply EB P A B Supply EB P A B Air Filter Air Filter Schematic 19-2B: Four-way Solenoid, De-energi
3、ze-to-open, Fail-open Schematic 19-2A: Four-way Solenoid, De-energize-to-close, Fail-closed ASCO 8345 - Typ ASCO 8345 - Typ Solenoid Operated On-Off EA EA 19-13 Postitoner with Solenoid Override Schematic 19-3A: Signal-to-open, Fail-closed, I/P 2000 SOV Signal Interrupt, De-energize-to-close De-ener
4、gizing 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-en
5、ergize-to-open Supply SOV Input Air Filter Signal Output 2 Output 1 Supply Air Filter Signal Output 2 Output 1 SOV Input 19-14 Output 2 Output 1 2 3 1 Supply 2 3 1 Positioner With Solenoid Override Schematic 19-4A: Signal-to-open, Fail-closed, Three-way Solenoid Signal Interrupt, De-energize-to-clos
6、e Solenoid ASCO 8320 TYP Solenoid ASCO 8320 TYP Output 1 Output 2 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.
7、 Schematic 19-4B: Signal-to-close, Fail-open, Three-way Solenoid Signal Interrupt, De-energize-to-open Signal Signal Air Filter Air Filter 19-15 Schematic 19-5A: Signal-to-open, Fail-closed, Three-way Solenoid Override, De-energize-to-close 13 2 Solenoid ASCO 8320 TYP Output 1 Output 2 Supply Air Fi
8、lter Output 1 Output 2 Air Filter 13 2 Solenoid ASCO 8320 TYP 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. Schematic 19-5B: Signal-to-clo
9、se, Fail-open, Three-way Solenoid Override, De-energize-to-open Supply Signal Signal 19-16 Flow Boosters Supply Output 2 Output 1 Signal Supply Air Filter Supply Output 2 Output 1 Signal Air Filter Supply Schematic 19-6A: Signal-to-open, Fail-close, Flow Boosters Schematic 19-6B: Signal-to-close, Fa
10、il-open, Flow Boosters 19-17 Supply Signal 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 Quick Exhaust Valve Supply Signal Needle Valve Air Filter Quick Exh
11、aust Valve Output 2 Output 1 Output 2 Output 1 19-18 Schematic 19-8C: Signal-to-close, Fail-open, Speed Control in Open Direction Supply Air Filter Signal Output 2 Output 1 Check Valve Speed Control Valve Speed Control Valve Check Valve Supply Air Filter Signal Output 2 Output 1 Speed Control Valve
12、Check Valve Supply Air Filter Signal Output 2 Output 1 Check Valve Speed Control Valve Schematic 19-8A: Signal-to-open, Fail-closed, Speed Control in Both Directions Schematic 19-8B: Signal-to-open, Fail-closed, Speed Control in Closed Direction Speed Control System 19-19 ? ? ? Supply Air Filter Out
13、put 1 Output 2 Exh * 0.062 Bleed Orifice Switching Valve Vent* D Schematic 19-9A: Signal-to-open, Fail-in-place Lock-up System Schematic 19-9B: Signal-to-close, Fail-in-place Lock-up Valve (Normally Closed) InCyl Exh Cyl In Lock-up Valve (Normally Closed) A B C Signal * *Spring Optional * 0.062 Blee
14、d Orifice Switching Valve Lock-up Valve (Normally Closed) * Lock-up Valve (Normally Closed) *Spring Optional Exh Cyl C Exh Supply In In Vent* A B D Output 1 Output 2 Signal Air Filter Cyl 19-20 Volume Tank Fail-Safe System Schematic 19-10B: Signal-to-close, Fail-open, Volume Tank Supply Signal Outpu
15、t 2 Output 1 * 0.031 dia. Bleed Orifice 2 3 Optional Solenoid, ASCO 8320 - Typ Volume Tank Supply In Exh Output 2 D Cyl Optional Solenoid, ASCO 8320 - Typ A B C Vent* Volume Tank Air Filter Air Filter Schematic 19-10A: Signal-to-open, Fail-closed, Volume Tank 1 Exh Lock-up Valve (Normally Open) Lock
16、-up Valve (Normally Closed) Lock-up Valve (Normally Closed) Lock-up Valve (Normally Open) D A B C Exh Cyl In In Cyl Vent* 1 2 3 CylExh In Output 1 Signal * 0.031 dia. Bleed Orifice 19-21 Cyl Exh In In Cyl Exh 1 3 2 A D B C Vent* Output 2 Output 1 Signal Supply Air Filter Volume Tank Fail-Safe System with Boosters Cyl B Output 2 Signal Supply Vent* In Exh InCyl Exh Output 1 0.031 dia. Bleed Orifice Schematic 19-11B: Signal-to-close, Fail-open, Volume Tank Schematic 19-11A: Signal-to-open, Fai
