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4. Proper Installation
CAUTION
• Do not use excessive force when connecting threaded pipes to the product. Over-tightening
may cause breakage leading to fluid discharge, which may cause burns or other injury.
• Install for use under conditions in which no freeze-up will occur.
1. Avoid installing check valves within a short distance after ON-OFF or extremely quick opening
valves as they may create shock or hammer conditions which could shorten check valve life.
Rapid pulsation or strong shocks to internal parts may result in spring damage or premature
wear on the valve disc and seating surfaces. To improve operation, install the check valve
further away from any quick opening valves to provide additional piping volume. Extra
distance and volume can allow the system pressure to adjust gradually, thereby reducing
surges and potential shock on the check valves.
2. Be sure to choose the model that meets operating temperature requirements as shown below:
Max. Operating Temp. ºC (ºF)
Model
* Model CK3R with optional disc inlay ring of FPM rubber can be used to 150 ºC (302 ºF).
3. Before installation, be sure to remove all protective seals.
4. Before installing the product, blow out the inlet piping to remove all dirt and oil.
5. The product can be installed horizontally or vertically, but vertical installation is recommended.
6. Install the product so the arrow on the body is pointing in the direction of flow.
7. Make sure the weight of the outlet piping does not place an excessive load on the product.
8. CKF3M, CKF3R, CKF3MG and CKF3RG are flangeless models, with an easy-to-center design.
To center, install with the fins touching the bolts.
5. Operational Check
A visual inspection can be carried out to aid in determining the necessity for immediate
maintenance or repair. Periodically (at least biannually) the operation should be checked using
diagnostic equipment such as a stethoscope.
Normal:
Where inlet pressure is higher than outlet pressure (equal to or greater than the
minimum opening differential pressure), flow, in the proper direction, can be verified.
If outlet pressure becomes higher than inlet pressure, flow ceases.
Leakage:
There is flow even when outlet pressure becomes higher than inlet pressure.
6. Inspection and Maintenance
Operational inspections should be performed at least twice per year, or as called for by the check
valve operating conditions.
CAUTION
equals atmospheric pressure and the surface of the product has cooled to room temperature.
• Be sure to use the proper components and NEVER attempt to modify the product.
Gaskets
Valve Disc, Inlet Union Sealing Surfaces
Coil Spring, Spring Holder (after cleaning inside the body)
Model
Size
mm
(in)
N
/
(
1
)
15
2
/
(
3
)
20
4
(1)
25
/
(1
)
1
32
4
/
(1
1
)
40
2
(2)
50
(3)
80
• Installation, inspection, maintenance, repairs, disassembly, adjustment
and valve opening/closing should be carried out only by trained
maintenance personnel.
350 (662)
CKF3M
CKF3MG
• Installation, inspection, maintenance, repairs, disassembly, adjustment and valve
opening/closing should be carried out only by trained maintenance personnel.
• When disassembling or removing the product, wait until the internal pressure
Parts Inspection Procedure
Tightening Torque and Distance Across Flats
CK3M / CK3T / CK3R
Torque
Distance Across Flats
m
(lbf
ft)
mm
•
•
(73)
100
27
(110)
150
32
(130)
180
41
(185)
250
50
(220)
300
55
(290)
400
70
̶
220 (428)
185 (365)
CK3M
CK3T
CK3MG
Fin
Bolt
Check for warping or damage
Check for scratches
Check for scratches or wear
Torque
(in)
N
m
•
̶
/
(1
1
)
16
̶
/
(1
)
1
4
/
(1
5
)
180
8
̶
/
(1
31
)
32
/
(2
)
5
600
32
/
(2
)
3
800
4
̶
800
̶ 11 ̶
150 (302)
90 (194)
CKF3R
CK3R*
CKF3RG
CK3MG
Distance Across Flats
(lbf
ft)
mm
•
̶
̶
(130)
41
̶
(440)
60
(590)
(2
75
(590)
(3
100
〜 〜
1 N ・ m
10 kg ・ cm
(in)
/
(1
5
)
8
/
(2
)
3
8
/
)
15
16
/
)
15
16
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