Parker CK4A-DN, CK4A Service Manual

CHECK VALVE

32 bar (460 psi)

• Complies with Pressure Equipment Directive 97/23/EC

• Complies with Pressure Equipment Directive 97/23/EC

DN 32-100 32 bar (460 psi)

• Design Pressure (PS): DN 13-25 34.5 bar (500 psi)

Type CK4A, CK4A-DN

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 (PS): 34.5 bar (500 psi)

• Complies with Pressure Equipment Directive 97/23/EC

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.

Fig. 1

BULLETIN 50-16

Type CK4A-DN

February , 2002

Installation and Service Information

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 DN50-10) 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
REGULA T OR WITH AN ELECTRIC SHUT-OFF FEA TURE; DO
NOT INSTALL AT THE INLET OF AN OUTLET PRESSURE
REGULATOR IN A SYSTEM WHERE LIQUID MAY BE
TRAPPED BETWEEN TW O V ALVES. Check V alves when used
with such valves should always be installed at the outlet of
the valves.

NOTE: THE ODS COPPER FLANGES A V AILABLE 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
INST ALLA TIONS 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 v alve , 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.

Refrigerating Specialties Division

310230

1

ISO 9001 CERTIFIED

For replacement parts and prices, consult
PARTS KITS LIST PRICE SCHEDULE INDUSTRIAL AND FLO-CON (PK)

CK4A 1-1/4" TO 4"

PRESSURE BEARING COMPONENTS

COMPONENT DESCRIPTION MATERIAL

CASTING,BODY 1-1/4 CK4A DN DUCTILE IRON GGG 40.3
SEAT,V A LV E 1-1/4, 2-1/2 & 3" CK 4A BAR, RD 2.687 S T L 1213
SE A T, V A LV E 2 CK 4A 3-3/8" DIA . 1215 C.D.S./ HA RD CHRO M E P LA TE
SEAT,V A LV E 4 CK 4A TUBE , RD 6.00 O D X 3.00 I D S TL
DISC, VA LV E CK 4A - 6 1-1/4 AS TM A240 304 S TA INLE S S S TE E L
DISC, VALVE 2 T O " CK 4A B A R, RD 2.250 S S 303
DISC, VALVE CK 4A - 16 BA R,RD 4.000 S S 303
STEM,V A LVE 2 CK 4A BAR,RD .250 SS 303
STE M ,VALV E 2-1/2 CK 4A B A R,RD .312 S S 303
STE M ,VALV E 3 & 4" CK 4A B AR,RD .375 S S 303

ITEM DESCRIPTI ON

4 Gasket, Flange
6 Valve Seat
7O-Ring
8 Disc Asm.
9 Spring, Comp

Dimensional Data

PORT SIZE

Dimension 13mm 20-25mm 32mm 50mm 65mm 75mm 100m

(1/2”) (3/4 - 1”) (1-1/4”) (2”) (2-1/2”) (3”) (4”)

mm 75 113 95 114 148 148 179

A

inch 29.3 4.43 3.75 4.50 5.81 5.81 7.06
mm 38 62 95 114 148 148 179

B

inch 1.50 2.43 3.75 4.50 5.81 5.81 7.06
mm 27 32 50 60 70 81 89

C

inch 1.06 1.25 2 2.37 2.75 3.19 3.50

D mm 63 59 79 114 145 157 177

(FPT , SW) inch 2.47 2.32 3.10 4.47 5.72 6.16 6.97

Conn.

Size 3/8, 1/2, 3/4 3/4” 1” 1-1/4” 1-1/4” 1-1/2” 1-1/2” 2” 2-1/2” 3” 4”

mm 82 97 117 117 126 136 171 177 215 245 298

E

inch 3.22 3.82 4.61 4.61 4.97 5.35 6.72 6.97 8.47 9.66 11.72

Conn.

Size 1/2 5/8 7/8 7/8 1-1/8 1-3/8 1-5/8 1-3/8 1-5/8 2-1/8 1-5/8 2-1/8 2-5/8 2-5/8 3-1/8 3-1/8 3-5/8 4-1/8

mm 76 82 98 99 193 99.5 111 119 130 159 193 177 205 203 250 228 248 285

F

inch 2.98 3.22 3.85 3.88 4.07 3.91 4.36 4.69 5.12 6.26 7.57 6.95 8.08 7.98 9.82 8.95 9.76 11.2
mm913292024252825283428343737424248 55

N

inch .37 .50 .75 .75 .93 .96 1.09 .96 1.09 1.34 1.09 1.34 1.46 1.46 1.65 1.65 1.90 2.15
mm 13 13 15 15 25 29 32

P

inch .50 .50 .60 .60 1.0 1.1 1.3

Refrigerating Specialties Division

2

Type CK4 – 1/2" thru 1-1/4"

Type CK4 – 2" thru 4"

A

Refrigerating Specialties Division

P

C

D

B

3

Service

Dirt or other foreign material in the system is the greatest
single cause of valve malfunction.

Before disassembling a check valve for servicing, read and
become familiar with the Safe Operation Instructions in this
bulletin as well as in the current issue of Safety Bulletin RSB .

Check the following chart for possible symptoms and
corrections.

Symptom Probable Reason Correction

Valve does not Dirt or chips Disassemble valve
close or there under valve seat. and clean
is leakage thoroughly.
through valve. Replace any

damaged parts.

Valve chatters. Valve is Replace with

oversized. smaller port size or

use Type CK-1.

Disassembly

Caution - If the valve to be disassembled or removed is

close-coupled to a solenoid operated valve make sure that
the power supply to the valve is de-energized and all
refrigerant is pumped out of the line. Refer to Page 3 as
necessary. After removing the v alve from betw een the flanges
remove the parts in the numerical order shown in the
applicable exploded view. In all CK4A Valves the seat plates
with the O-rings are removed by gently tapping out the seat
from the opposite end of the valve body. Use a wooden dowel
for this purpose.

Assembly

Before assembling all parts must be clean, dry and lightly
coated with refrigerant oil. If an existing valve or strainer is
close-coupled to the check valve, either one should be
opened, inspected and cleaned before putting it and the
check valve back in service.

Refer to Page 3 as applicable. Assemble the valve in the
reverse numerical order shown in the exploded view. Make
sure the O-ring is firmly seated and permanently retained by
the seat plate when reassembled.

Warranty

All Refrigerating Specialties products are warranted against
defects in workmanship and materials for a period of one
year from date of shipment from originating factory. This
warranty is in force only when products are properly installed,
field assembled, maintained, and operated in use and service
as specifically stated in Refrigerating Specialties Catalogs
or Bulletins for normal refrigeration applications, unless
otherwise approved in writing by Refrigerating Specialties
Division. Defective products, or parts thereof returned to the
factory with transportation charges prepaid and found to be
defective by factory inspection will be replaced or repaired
at Refrigerating Specialties option, free of charge, F.O.B.

factory. Warranty does not cover products which have been
altered, or repaired in the field; damaged in transit, or have
suffered accidents, misuse, or abuse. Products disabled by
dirt or other foreign substances will not be considered
defective.

THE EXPRESS WARRANTY SET FORTH ABOVE
CONSTITUTES THE ONLY WARRANTY APPLICABLE TO
REFRIGERA TING SPECIAL TIES PRODUCTS , AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED,
WRITTEN OR ORAL, INCLUDING ANY WARRANTY OF
MERCHANTABILITY, OR FITNESS FOR A PARTICULAR
PURPOSE. No employee, agent, dealer or other person is
authorized to give any warranties on behalf of Refrigerating
Specialties, nor to assume, for Refrigerating Specialties, any
other liability in connection with any of its products.

Safe Operation (See also Bulletin RSBCV)

People doing any work on a refrigeration system must be
qualified and completely familiar with the system and the
Refrigerating Specialties Division valves involved, or all other
precautions will be meaningless. This includes reading and
understanding pertinent Refrigerating Specialties Division
product Bulletins, and Safety Bulletin RSBCV prior to
installation or servicing work.

Where cold refrigerant liquid lines are used, it is necessary
that certain precautions be taken to avoid damage which
could result from liquid expansion. Temperature increase in
a piping section full of solid liquid will cause high pressure
due to the expanding liquid which can possibly rupture a
gasket, pipe or valve. All hand valves isolating such sections
should be marked, warning against accidental closing, and
must not be closed until the liquid is removed. Check valves
must never be installed upstream of solenoid valves, or
regulators with electric shut-off, nor should hand valves
upstream of solenoid valves or downstream of check valves
be closed until the liquid has been removed. It is advisable
to properly install relief devices in any section where liquid
expansion could take place.

Avoid all piping or control arrangements which might produce
thermal or pressure shock.

For the protection of people and products, all refrigerant must
be removed from the section to be worked on before a valve,
strainer, or other device is opened or removed.

Flanges with ODS connections are not suitable for ammonia
service.

Parker Hannifin Corporation • Refrigerating Specialties Division
2445 South 25th Avenue • Broadview, IL 60155-3891 USA
Telephone: [phone] • Fax [phone]

4