30 Installation, Operations & Maintenance Manual
SUCTION AND 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 (FROM DISCHARGE LINE INTO SUCTION LINE).
6. After completing pipe connection, tighten lock
nut (520) securely against spot face so that
O-ring (540) is trapped in chamfer of liquid end
thread. Make sure that the spiral back-up ring
(530) is completely contained in its recess and
not extending to the outside.
4.9.1.2 mRoy A Plastic, Current Design
(Figure 19)
Disassembly
1. Unscrew the check valve assembly from the
pump liquid end.
2. Both the suction and discharge check valves
may be disassembled in the same way. While
carefully holding the body use a 5/16” rod to
push out the internal parts. Do not damage the
sealing face (opposite the threaded end) on the
valve body. It is essential to reinstall the ball
guides and ball stop in the proper direction, so
take note during disassembly and follow the
assembly drawing.
3. Carefully clean any parts to be reused. If any
chemicals are used in the cleaning process,
ensure that they are approved with the process
liquid.
Reassembly
NOTE:
To assure a tight, leak free seal, new seals and
O-rings should be used each time the check
valves are disassembled.
1. Lightly coat the O-rings on the ball guides
with mineral oil or other food grade lubricant
(Refer step 3, from topic section 4.9.1.2). It is
essential to reinstall the ball guides and ball
stop in the proper direction. Remember the ball
always lifts off the seat in the direction of liquid
ow. The ball stop is used to retain the last ball
check on the suction cartridge.
2. Remove the old valve-to-head seal (435) from
the head and install a new seal. A fracture of
the diaphragm head may result from installing
the check valve against two seals or excessive
tightening. The groove in the seal is to be
oriented against the check valve body.
4.9.1.3 mRoy B Plastic Liquid End (Figure 24)
Disassembly
1. The mRoy B plastic check valves are held in
place by two long bolts (521) that extend through
the diaphragm head. Unscrew the nuts (519) to
remove the check valves from the liquid end.
Use caution when doing so, as the suction check
valve and compression plate (518) will fall off
when the bolt is removed.
2. Remove and discard the check valve O-rings
(540).
3. Carefully clean any parts to be reused. If any
chemicals are used in the cleaning process,
ensure that they are approved with the process
liquid.
Reassembly
NOTE:
To assure a tight, leak free seal, new O-rings
should be used each time the check valves are
disassembled.
1. The discharge check valve consists of two
separate pieces that are shipped held together
SECTION 4 - MAINTENANCE
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