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Technical Information Check Valves Features Parker's Check Valves employ several unique features that poppet-guide cushion combine to offer the finest check valves insure years of trouble-free operation.The double seat, available.The double seat and cushioned poppet are exclu- guided poppet, oil retention groove in the poppet, and the sive to Parker. The graphic symbol for a check-valve is: INLET PORT OUTLET PORT DOUBLE SEAT AREA CUSHIONED SEAT POPPET ENSURES LONG-LAST- POPPET/RETAINER ING SEAT LIFE DESIGN TO DECELERATE POPPET FREEFLOW FREEFLOW PRESSURE AT INLET PORT. POPPET IS MOVED OFF SEAT. OIL IS TRAPPED IN FLOW IS ALLOWED THROUGH VALVE. SPRING CAVITY AND FORCED THROUGH CLOSE TOLERANCE FIT INLET PORT OUTLET PORT BETWEEN RETAINER RETAINER AND BODY FREEFLOW PRESSURE AT OUTLET PORT. POPPET IS MOVED AGAINST SEAT. FLOW IS BLOCKED AT SEAT An arrow on the check valve indicates the free flow direction. Crack Pressure Crack pressure refers to the amount of fluid pressure in the perform special circuit functions, or operate under unique free flow direction required to move the poppet off the seat. conditions. The normal crack pressure setting is 5 PSI; however, other Check valves are not field repairable or adjustable. Crack crack pressures are available to allow the check valve to pressure settings are made at the factory only. Applications TYPICAL HYDRAULIC CIRCUIT.THE CHECK VALVE IS USED TO PRO- TECT THE PUMP BY PREVENTING PRESSURE FROM RETURNING TO THE OUTLET PORT OF THE PUMP. EValvesCheck CHECK VALVE PUMP RELIEF Oil cooler bypass circuit. If return line pressure becomes exces- CONTROL TANK VALVE sive due to resistance through oil cooler (such as startup in cold VALVE TANK CYLINDER weather). Check valve opens and allows oil to bypass the cooler and flow to the tank. Quick Coupling Division 8145 Lewis Road � Minneapolis, MN 55427 E-5 www.parker.com/quickcouplings
Goodyear Rubber Products
