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Refrigerating Specialties Division

CHECK VALVE

Type CK4A

Port Size 13 - 100mm (1/2” - 4”)
FOR AMMONIA, R12, R22, R502
AND OTHER COMMON REFRIGERANTS

FEATURES

• UL Listed (Thru 3" Size)

• Installs in any position

• Compact

• Lightweight

• In-Line

• Design Pressure (MRP): 34.5 bar (500 psi)

BULLETIN 50-16C

September 1990

Installation, Service and Parts Information

050280

I S O 9 0 0 1 C E R T I F I E D

Description

These compact valves are spring closing with a lapped,
stainless steel or chrome plated seat for positive closing
action and low leakage. A minimum pressure difference of
0.05 bar (0.75 psi) is required to hold the valve in the open
position. Removable seat plate with combination O-ring and
metal-to-metal knife edge seal allows the valve to be
disassembled for maintenance. They may be ordered with
male adapter rings for close-coupling to other Refrigerating
Specialties valves and may be installed in any position.

Purpose

The Type CK4A Check Valves prevent backward flow of fluid
in refrigerant suction, hot gas or liquid lines. The most frequent
use for these valves is in recirculating (overfeed) systems.
They are especially suited for high speed compressor
discharge, pump discharge, suction - down to -50°C (-60°F)
and hot gas lines (pan to evaporator).

Certain refrigerant flows pulsate sufficiently or with a
frequency in harmony with the valve’s natural frequency,
which can cause “slapping” or even wholesale failure. These
valves are not recommended for slow speed compressor
discharge lines (See CK-1, Bulletin 50-10B) or for any
compressor discharge where a low speed machine
discharges into the same downstream header, or for use on
side-port suction lines on a screw compressor installation.

Operation

These are light spring-closing check valves. An increase in
the pressure drop across the valve overcomes the force of
the closing spring and the disc is forced away from its seat
permitting flow. As the flow decreases, the disc is forced
back against its seat by the expansion of the closing spring.
Flow is then stopped.

Installation

Keep dirt from entering the valve. Do not remove protective
packaging until ready to install.

Install the valve where it can be serviced easily. DO NOT
INSTALL AT THE INLET OF A SOLENOID VALVE, OR A
REGULATOR WITH AN ELECTRIC SHUT-OFF FEATURE; DO
NOT INSTALL AT THE INLET OF AN OUTLET PRESSURE
REGULATOR IN A SYSTEM WHERE LIQUID MAY BE
TRAPPED BETWEEN TWO VALVES. Check Valves when used
with such valves should always be installed at the outlet of
the valves.

NOTE: THE ODS COPPER FLANGES AVAILABLE ARE ONLY
FOR INSTALLATIONS WHERE R-12, R-22, AND R-502 OR
OTHER HALOCARBON REFRIGERANTS ARE USED. DO
NOT USE THESE FLANGES FOR AMMONIA. FOR
INSTALLATIONS USING AMMONIA THE FPT, SOCKET WELD
OR WELD NECK FLANGES SHOULD BE USED.

The Type CK4A Valves may be installed in any position. The
valve must be installed with the arrow pointing in the direction
of flow. After installing the valve, tighten the flange bolts evenly.

The CK4A Check Valves may be closed-coupled to
Refrigerating Specialties Refrigerant Valves and most hand
valves by using a Refrigerating Specialties Male Adapter Ring.

Fig. 1