172-65134A-03 (NF6) 16 Dec 2019
6
Table of Tightening Torques
Part
Torque
Distance Across Flats
N
∙m
(lbf
∙ft)
mm
(in)
Valve Seat*
35
(26)
17
(
21
/
32
)
Body
Straight G(PF) thread*
35
(26)
21
(
13
/
16
)
Tapered R(PT) thread**
30
(22)
21
(
13
/
16
)
NOTE: *Coat threads with anti-seize
**Wrap threads with 3 - 3.5 turns of sealing tape
-If drawings or other special documentation were supplied for
the product, any torque given there takes precedence over
values shown here.
(1 N
⋅
m
≈
10 kg
⋅
cm)
Exploded View
Valve Seat
Coil Spring
Valve Disc
Valve Disc Guide
Screen
Body
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
No condensate is
discharged
(blocked) or
discharge is poor
Valve disc, valve seat, screen, or
piping is clogged with rust or scale
Clean parts
Freezing occurs on outlet pipe, etc. Examine the size, length and
installation of the outlet pipe and take
appropriate corrective measures
Steam is
discharged or
leaks from the
outlet
(blowing)
(steam leakage)
Rust or scale or other build up have
accumulated on the valve disc or
valve seat
Clean parts
Valve disc or valve seat are
damaged
Replace with a new valve and valve
seat
Improper installation orientation
Reinstall with correct flow direction
Improper installation, size or length
of outlet pipe
Make sure outlet pipe is at least ø6
mm (
15
/
64
) internal dia., of appropriate
length and has no more than 3 bends
Steam leaks from
a place other than
the outlet
Gasket deterioration or damage
Replace with a new gasket
Improper tightening torques were
used
Tighten to the proper torque
