13 Special Purpose Valves Specifications subject to change without notice or incurring obligation 13.2 5-21-04 OUT Vent .26 Maximum 1.75 2.69 2.25 .25 Vent adjustment Screw & Locknut IN .94 1.25 .25 RV-1 1/8 NPT Ports RV-2 1/4 NPT Ports 2 Mounting Holes for #10 Screws 1/2 Hex .56 Maximum .75 .38 Vent OUT IN Pressure Sensing/Sequence “RV”Valve Function The “RV”, with its unique poppet type seal, senses the pressure being applied and opens at a pre-adjusted point to provide a pilot signal for circuit control.Because the output force of a cylinder is a direct function of pressure times area, the “RV” provides direct and precision adjustable force sensing. If the application requires that a predetermined force be applied to an object at a point that may vary in physical dimension (such as riveting, crimp- ing, etc.) the “RV” is the control to use. It assures that the predetermined force (pressure) is applied. If the system pressure should drop below the “RV's” set point, the valve cannot open. Therefore the cycle will stop and wait for the required pressure rather than produce an unacceptable rivet or crimp. When the required pressure is restored the cycle will continue. If the application requires that a particular physical point is reached by the cylinder then a position sensor, such as a limit valve, Hall Effect sensor, Reed Switch, limit switch, or other device should be used. Features • Simple - One moving part • Corrosion resistant construction • Black anodized aluminium body • Light weight • Compact • Repairable • Buna-N seals • Simple adjustment • Operating temperature 0° to + 180°F Operating pressure : 20 to 150 psi Standard Spring: 50 to 150 psi Light Spring: 20 to 55 psi Light spring and instructions included with each unit. Dimensions Symbol The basic “RV” valve function is two way normally closed.When the input is removed the spring automatically closes the valve, trapping downstream or output pressure. A vent is incorporated in the valve to relieve this trapped signal. The vent is adjustable so that it can be set for various pilot volumes and cycle times. Basic procedure for setting 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. Pressure Sensing (See circuit on page 13.4) Accurately senses pressure (force) and provides a control signal to retract cylinder. Applications : Riveting, crimping, marking, staking, molding and more. Sequencing (See circuit on page 13.4) The pressure rise in a cylinder indicates that it is applying the force intended. When the pressure preset into the “RV” is reached, it produces a signal for the control circuit to initiate the next function, thus the next sequence. Applications : Step by step extension and retraction of multiple cylinders. Time delay or Function delay (See circuit on page 13.4) Coupled with a flow control & volume chamber, the “RV” provides time or function delay. Applications : Heat sealing, gluing, compacting, time between functions, load or unload time, and many others. Please note the following : • This valve is intended for control circuit signals only and CANNOT operate a cylinder directly. • For most consistent accuracy, the “RV” set-point should be at 90% to 95% of incoming system pressure. • For accurate circuit setup, pressure gages should be installed to monitor incoming circuit pressure and indicate “sensed” pressure. See circuits on page 13.4. Sizing Model Number RV-1 RV-2 Port Size, NPT 1/8 1/4 Weight 4.7 oz. 4.6 oz.