8
IOM-A-Deringer 40G/40GX/50G/50GX_6-8
2005
EDP#2916009
© 2020 Watts
NOTICE
Typically, when a RP device is leaking from the relief valve, a fouled
or damaged first check valve is the cause. Make sure the first check
valve is functioning properly before assuming there is a problem with
the relief valve. If the first check is found to be functioning properly,
we recommend cleaning the relief valve piston (B) and seat (C). Use
a toothbrush (A) to gently brush away any debris on the relief valve
piston (B) or seat (C) that may be preventing the piston (B) from seal-
ing properly against the seat (C). This should return the relief valve to
proper working order without disassembly or the use of a repair kit.
Maintenance of Relief Valve
A
B
C
B
A
E
1. Using a
5
/
8
" box wrench disconnect the relief valve sensing
line from the valve body (A).
2. To remove the relief valve from the valve body disconnect
the two relief valve mounting bolts (B) using a
9
/
16
" wrench.
When removing the relief valve be sure not to drop the top
O-ring (C) as the relief valve body uses this O-ring to seal
against the valve body.
3. To access the relief valve remove the relief valve cover using
two
7
/
16
" wrenches to remove cover bolts (D).
4. Remove the relief valve diaphragm (E) and check the
diaphragm for tears, holes or debris (F).
C
NOTICE
If one is certain that the relief valve requires maintenance proceed as follows.
F
D
D
