172-65120MA-13 (CK-Series) 24 Aug 2020
10
Table of Tightening Torques
Inlet Union
Model
CK3M/CK3T/CK3R/CK3T-M
CK3MG
Size
Torque
Distance Across Flats
Torque
Distance Across Flats
mm
(in)
N
m
(lbf·ft)
mm
(in)
N
m
(lbf·ft)
mm
(in)
15
(
1
/
2
)
100
(73)
27
(1
1
/
16
)
—
—
20
(
3
/
4
)
150
(110)
32
(1
1
/
4
)
—
—
25
(1)
180
(130)
41
(1
5
/
8
)
180
(130)
41
(1
5
/
8
)
32
(1
1
/
4
)
250
(185)
50
(1
31
/
32
)
—
—
40
(1
1
/
2
)
300
(220)
55
(2
5
/
32
)
600
(440)
60
(2
3
/
8
)
50
(2)
400
(290)
70
(2
3
/
4
)
800
(590)
75
(2
15
/
16
)
80
(3)
—
—
100
(3
15
/
16
)
(1 N
m
10 kg
cm)
NOTE: If drawings or other special documentation were supplied for the product, any torque given
there takes precedence over values shown here.
Troubleshooting
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
When the product fails to operate properly, use the following table to locate the
cause and remedy.
Problem
Cause
Remedy
Screwed
Flangeless
The sound of flow
can be heard when
the outlet pressure is
higher than inlet
pressure
Dirt or damage on sealing surfaces or
build-up inside the body
Clean parts
The valve disc is catching due to wear,
dirt, rust, etc.
Replace with a new check valve
The coil spring is dislodged or broken Replace with a
new coil spring
Replace with a
new check valve
The spring holder is dislodged or
broken
Replace with a new check valve
Leakage to the
outside of the check
valve
The union gasket is warped or
damaged
Replace with a
new gasket
—
Incorrect inlet union tightening torque Tighten to the
proper torque
—
The check valve is subject to stress
from the piping (weight, torsion, etc.)
Correct the piping
—
Flow is poor
The valve disc is catching due to wear,
dirt, rust, etc.
Clean parts
Incorrect operating pressure
Adjust by increasing the pressure or
replace with a check valve that has a
larger Cv value
The valve does not
open at the specified
differential pressure
Sticking of the valve and the valve seat
due to rust, pipe sealing agent, etc.
Clean parts
If the valve disc is inlaid with rubber, it
may be the case that the rubber is
sticking to the metal. Contact TLV for
details.
NOTE: When replacing parts with new, use the parts list for reference and replace with parts from the
Maintenance Kit, Repair Kit, etc. (Please note that replacement parts are only available in pre-
packaged kits.)
