Brochure

Parker Hannifin Corporation
Climate & Industrial Controls Group
Cleveland, OH
Catalog CIC-2003-1/US
352
Industrial Refrigeration Products: Pressure Regulators
Type A2CK Relief Regulators
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Compact, direct diaphragm operated
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Maximum rated pressure (MRP): 27.6 bar (400 PSIG)
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Flanged connections: FPT, SW, WN, ODS
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Available with close coupled strainer
Description
The A2CK pressure relief regulator is direct diaphragm
operated, for use with refrigerant liquid or vapor. The
regulators can be used with ammonia, R-22, R-134a,
R-507 and other common refrigerants. This regulator is
used in systems where a small direct operated valve is
required as a safety device to relieve “trapped” liquid lines in
the event that a hydrostatic pressure condition develops.
The A2CK should not be piped or applied as ASME certified
safety relief valve for use on pressure vessels.
The A2CK utilizes a special pilot seat designed to provide
for a higher flow rate (Cv) than the A2BK relief regulator.
Additionally, with a relatively small ratio of diaphragm to
pilot seat area, it is designed to open and regulate refriger-
ant flow quickly through the pilot seat once its set point has
been reached. The design of the valve allows for this “quick
release” feature. However, it does not offer the same type
of controlled response which may be required for a stan-
dard regulator application. For those applications where a
small regulator is needed for accurate upstream pressure
control, an A2A or A2B direct operated regulator should be
considered.
The A2CK is factory set and sealed with a lead seal prior to
shipment. Since the valve should be used exclusively as a
small internal relief valve, it is designed with the “D” range
adjusting spring only. Set points must fall in the 75 to 280
PSIG (5 to 19 bar) range.
Materials
Body Material ......................................................... Gray iron
Seat Material ................................................Chrome plated
Diaphragm Material ...................................... Stainless steel
Specifications
Maximum Fluid Temperature ........................ 105°C (220° F)
Minimum Fluid Temperature ...........................-45°C (-50° F)
Design Pressure (MRP)....................... 27.6 bar (400 PSIG)
Flow Coefficient ....................................................... 1.14 Cv
Dimensions
173mm (6.8")
211mm (8.3")
73mm (2.9")
117mm (4.6")
Technical Information