13 Special Purpose Valves Specifications subject to change without notice or incurring obligation 13.3 1-17-08 OUT CYL IN Start Signal Regulated System Input Mufflers V2 4 Way Double Pilot V1 One Shot (Pulse) Valve V3 Pressure Sensing Valve EXH Vent Gauge C1 Work Cylinder IN Circuits RV-1 or RV-2 Pressure Sensing/ Sequence Valve Flow Control Incoming Pressure Vent OUT IN Volume Chamber Sensed Pressure Delayed Output Input V7 One Shot (Pulse) Valve V6 3 Way Limit Valve EXH CYL IN C2 Cylinder Flow Control Valves Supply C1 Cylinder Regulated Supply Start Signal V1 4 Way Control Valve Vent IN OUT Supply Vent Gauge CYL IN EXH Out IN Gauge V3 One Shot (Pulse) Valve V2 Pressure Sensing/ Sequence Valve V5 Pressure Sensing/ Sequence Valve Flow Control Valves V4 4 Way Control Valve Sequencing Circuit 1. Start signal to V1 2. C1 - extends to load 3. Load pressure from C1 to V2 4. Constant signal from V2 to V3 5. Pulse signal from V3 to V4 6. C2 extends to load 7. Load pressure from C2 to V5 8. Signal from V5 to V4 9. C2 retracts to V6 10. Constant signal from V6 to V7 11. Pulse signal from V7 to V1 12. C1 retracts Pressure Sensing Circuit 1. Start signal can be maintained or momentary 2. Pulse signal from V1 to V2 3. C1 extends 4. Load pressure from C1 to V3 5. Signal from V3 to V2 6. C1 retracts Time Delay Circuit “RV”Valve Function As the cylinders in any circuit move, there is a natural pressure drop or differential between the incoming system supply and the cylinder where the “RV” is sensing the pressure.When the cylinder meets its load it slows or stops. Air flow then becomes slow or static and the pressure rises to the “RV” setting. An output signal is then produced by the “RV”. This pressure change (differential) between the dynamic or moving pres- sure and the static or stopped pressure is a natural function of the cycle and is ESSENTIAL for proper “RV” function. If the load is a constant high load throughout the stroke, or speed controls are closed down causing a consistent high load, the “RV” may see “set point” pressure before the cylinder has done its final work.This results in a premature signal.There- fore, it is highly recommended that a gage be mounted in the “RV” line (as indicated in the circuit) so that the differential or lack thereof can be seen as well as the actual “set point” of the “RV” for cylinder force actuation. The basic “RV” valve function is two way normally closed. When the input is removed the spring automatically closes the valve, trapping down- stream or output pressure. A vent is incorporated in the valve to relieve this trapped signal.That vent is adjustable so that it can be set for various pilot volumes and cycle times. Basic procedure for setting the adjustment is to close the vent (turn adjustment screw clockwise), then open 1/4 to 1/2 turn. Fine tuning can then be made from that point. Please note that when applying these products or circuit concepts, all safety features that the equipment may warrant should be included and are the responsibility of the user.