OM−05850
G-R
MAINTENANCE & REPAIR
PAGE E − 5
The chamber between the upper and lower
valve bodies is filled with propylene glycol
anti-freeze, which could become contami-
nated with the product being pumped if
diaphrabm failure has occurred. Use cau-
tion to avoid contact with the liquid during
disassembly. Drain the liquid from the
valve into a suitable container and dispose
of properly.
Before attempting to disassemble the Air Release
Valve, position the valve at aproximately 60
_
from
horizontal and remove the pipe plug (1) and orifice
(2) from the upper valve body (4). Invert the valve,
drain the liquid from the valve into a suitable con-
tainer and dispose of properly.
Tension on the plunger spring (12) will be
released as the hardware (3 and 7) is re-
moved. When disassembling the Air Re-
lease Valve,
use caution
to prevent parts
from being ejected.
For Air Release Valve disassembly, disengage the
hardware (3 and 7) slowly to relieve tension on the
plunger spring (12). Separate the upper (4) and
lower (6) valve bodies.
Remove the diaphragms (5), plunger (13) and
spring (12) from the lower valve body. Use a pair of
needle-nose pliers or other suitable tool to remove
the U-ring (11) from the lower valve body.
Use cau-
tion
not to damage the U-ring groove sealing sur-
face.
To remove the adjustable restrictor (9), straighten
and remove the cotter pin (8). Unscrew the restric-
tor from the lower valve body and remove the re-
strictor O-ring (10).
Air Release Valve Reassembly
Clean the valve body, plunger rod and all compo-
nent parts (except the diaphragms, U-ring and O-
rings) with a soft cloth and soapy water or a citrus-
based solvent. Inspect the parts for excessive wear
or damage and replace as necessary.
Install the U-ring (11) in the lower valve body with
the cup side toward the bottom of the valve body.
The U-ring (11) must be installed in the
valve body with the cup side toward the
bottom of the valve body. Otherwise, ex-
cessive leakage will occur.
Install one of the diaphragms (5) in the inlet cham-
ber of the lower valve body (6).
Position the second diaphragm upside-down (with
the Gorman-Rupp logo down) on a flat work sur-
face. Position the plunger (13) on the diaphragm
and use the plunger to compress the diaphragm
until the edge of the diaphragm curls" over the
O.D. of the plunger (see Figure E−3).
DIAPHRAGM
(INVERTED)
PLUNGER
PUSH
DOWN
PLUNGER
DIAPHRAGM
CURLED OVER
PLUNGER O.D.
Figure E−3. Installing Plunger in Diaphragm
Install the spring (12) in the plunger chamber of the
lower valve body. Position the assembled plunger
and diaphragm over the spring (with the plunger
inside the spring). Use the diaphragm and plunger
to compress the spring until the shoulder of dia-
phragm seats squarely in the groove in the lower
valve body. Install a 1/2−13 UNC x 5-inch long
capscrew (not supplied) up though the hole in the
lower valve body for the restrictor (9). Screw the
