Parker CK-1 Installation, Service And Parts Information

Parker CK-1 Installation, Service And Parts Information Manual pdf 1 page image

Refrigerating Specialties Division 1ISO 9001-2000 CERTIFIEDCHECK VALVEType CK-1 DNPort Size 20 - 150mm (3/4” - 4”)Suitable For: Ammonia, R12, R22, R502and Other Common RefrigerantsFeatures• Manual Opening Stem• Low Pressure Drop• Piston Type Gravity Closing• Flanged• Design Pressure (PS): 28 bar (406 psig)• Rugged - Heavy Duty• Body Material made from GGG40.3• Complies with Pressure Equipment Directive 97/23/ECDescriptionThese piston type, gravity closing, heavy duty checkvalves are suitable for Ammonia, R-12, R-22, R-502,other refrigerants, certain oils and or fluids approved foruse in refrigeration. All CK1 check valves are flanged andhave a manual opening stem for manual operation. Theymay be ordered with male adapter rings (through 4” size)for close coupling. The 20-32 mm (3/4 - 1-1/4”) port sizehave a PTFE seat; larger valves have a metal to metalseat. A minimum pressure difference of .03 bar (0.5 psi)is required to open the valve.BULLETIN DN 50-10CSeptember 2007Installation, Service, and Parts InformationFig. 1: CK1-DN Cross-SectionPurposeThe Type CK1 Check Valves prevent backward flow offluid in refrigerant suction, hot gas or liquid lines. Theyare recommended for compressor discharge lines, alsofor liquid lines and suction lines with temperatures aslow as -30°C (-25°F).Principles of OperationThis piston type check valve opens by the pressuredifference between valve inlet and outlet. The pressuredifference must be a minimum of .03 bar (0.5 psi).When upstream pressure exceeds downstream pressure,the pressure on the bottom side of the piston-main valvewill lift the assembly and allow flow through the valve. Onopening, pressure above the piston-main valve assemblywill be relieved through the piston bleed hole, permittingthe piston to travel its full vertical distance and open thevalve to its full open position.When upstream and downstream pressures are qualized,the weight of the piston-main valve will cause it todrop tight against its seat bead and stop flow. Shoulddownstream pressure rise, the additional pressure actingon the top of the valve seat will further assist in seatingthe valve closed.Manual Opening Stem (Fig. 1)If it is desired to hold open the CK1 check valve manuallythis procedure should be followed. For access to thestem, the seal cap on the bottom of the valve must beremoved. This must be done with caution as refrigerantmay be trapped inside the seal cap. Manual opening isaccomplished by turning the stem clockwise until onlythe flats on the end of the stem protrude from the packingnut. To reset for automatic operation turn the stem310227

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