18
Instruction Manual
B. Reassembly
(refer to figure 13)
1. To install the cartridge, position the lock nut
(435) toward the shoulder of the cartridge so
that the recess on the face of the lock nut is
adjacent to the O-ring (441).
2. Make certain the split ring (439) is coiled in
a counterclockwise helix(this is opposite the
direction normally employed by suppliers of
these rings). Fit this split ring in the lock nut
recess. Push it firmly down in the recess as
completely as possible.
3. Install a new O-ring (435) against the split
ring.
Note:
To assure a tight, leak free seal, new O-rings
and split rings should be used each time the
check valves are disassembled.
4. Screw the cartridge assembly (444, 445) into the
liquid end until the O-ring band is approximately
level with the top of the spot face in the liquid
end, then screw it one (1) additional turn plus a
partial turn as required to align the pipe thread
port with connecting pipe.
SUCTION AND DISCHARGE
CHECK VALVE CARTRIDGES
ARE NOT IDENTICAL. BE SURE THAT THE CORRECT
CARTRIDGE IS BEING SCREWED INTO THE PROPER PORT.
(DISCHARGE CARTRIDGES HAVE HEXAGONAL CAP ON THE
TOP; SUCTION CARTRIDGES DO NOT.) IF CHECK VALVE
CARTRIDGES ARE INSTALLED INTO THE WRONG PORT, ONE
OF THE FOLLOWING WILL OCCUR: (A) IMMEDIATE SEVERE
DAMAGE TO PUMP MECHANISM, (B) NO PUMPING, (C)
REVERSE PUMPING ACTION (FRONT DISCHARGE LINE INTO
SUCTION LINE).
5. After completing pipe connection, tighten lock
nut securely against spot face so that O-ring is
trapped in chamfer of liquid end thread. Make
sure that the split ring is completely contained in
its recess and not extending to the outside.
1-3/4, 2-1/2, and 3”Plungers: Plastic Single- Ball
Check Valves:
see Figure 11
A. Disassembly
1. Unscrew the union nut (435). The union end
(445) is held in place by the union nut and will
now separate easily from check valve ball guide
(424).
2. Unscrew the ball guide (424) from the liquid
end.
3. Screw the union nut partially (one or two turns)
onto the end of the ball guide containing the
seat. Be sure the union nut is loosely installed
to allow for a gap for the seat (420) to drop into
as it is removed from the ball guide.
4. Sit the ball guide/union nut onto a flat surface
with the union nut down. Looking into the top
of the ball guide, you will see four large holes
surrounding one small hole. Insert a thin, blunt
instrument such as a hex head screwdriver into
the small center hole until it rests on the top of
the ball (422).
5. Tap screwdriver gently with a hammer until ball
and seat are released from the ball guide.
IF YOU ARE DISASSEMBLING
UNIT FOR INSPECTION ONLY,
BE SURE TO USE A BLUNT INSTRUMENT AND TAP GENTLY TO
AVOID DAMAGING THE BALL. IF THE BALL AND/OR SEAT ARE
DAMAGED DURING DISASSEMBLY, THEY WILL NEED TO BE
REPLACED. TO AVOID DAMAGE, IF AVAILABLE, IT IS
ADVISABLE TO USE GENTLE AIR PRESSURE (APPLIED AT
END OPPOSITE THE SEAT-420) FOR BALL AND SEAT
REMOVAL.
6. Carefully remove the two O-rings (419) from the
ball guide and seat.
SECTION 4 - MAINTENANCE
