Pentair myers aplex Series User Manual

33
CONVERTING PLUNGER TO PISTON
DISASSEMBLY:
1. Remove the 8 cap screws and the cylinder head
retaining plate from the front of the liquid end.
2. Unscrew the 3 glands from the stuffing boxes
and remove. Unscrew the 3 plungers from the
crossheads and work them gently through the
wiper box seals and plunger packing. Pull them
out the front of the pump.
3. Pull the stuffing box retainer plate to the back of
the cradle, and remove the 3 stuffing boxes.
REASSEMBLY:
1. Install the 3 liners in place of the stuffing boxes.
2. Pull the stuffing box retainer plate over the
3 liners.
3. Snap the piston cup over the piston hub.
Assemble the piston rod, O-ring, piston assembly,
piston keeper and nylock socket head cap screw
(12mm hex) together.
4. Insert the entire piston assembly through the
liquid end, liner and wiper box and screw into the
crosshead. Once it is assembled you can tighten
the nylock screw into the piston rod.
5. Reinstall the cylinder head retainer plate and 8
cap screws. Torque in an even manner as shown
in the service manual.
CHANGING PISTON CUPS
1. Remove the 8 cap screws and the cylinder head
retaining plate from the front of the liquid end.
2. Unscrew the nylock socket head cap screw
(12mm hex) and remove with piston keeper.
3. Screw a 5/8"-11UNC all thread stud into the
piston hub and remove from liner. Make sure the
O-ring comes out also.
4. Change piston cup and reinstall with a new O-ring
and nylock screw. Inspect the piston hub for wear.
It should be changed periodically.
5. Reinstall the cylinder head retainer plate and 8
cap screws. Torque in an even manner as shown
on previous page.
DISC VALVE SYSTEMS AND
ABRASION RESISTANT
GENERAL
Myers Aplex Series has developed a unique setting/
puller system permitting quick, easy and safe methods
of installing and removing tapered seat valves.
The system allows servicing without distortion of the
seat, with minimum effort and NO damage to fluid end
tapers or seat.
Tapered seats notoriously drive solidly down into
mating deck tapers, so firmly that extraction heretofore
has always posed severe problems. Old style valves
may be pulled only with the greatest effort, using “J”
puller heads (prone to failure), CO
2
– dry ice, and
other improvisations.
DISC VALVE AND ABRASION RESISTANT
VALVE CONSTRUCTION
The Myers Aplex Series valve is a precision made
subassembly using threads cut into the rim of seat
for use with Myers Aplex Series setting/pulling tool.
These threads do NOT deteriorate as proved by field
experience. By locating these on the rim, setting/
pulling forces are now applied only to the rim of the
seat, never to the webs (or “spokes”), or to the center
section. Distortion of the seat is eliminated.
Access to these seat threads is provided by the removal
of the valve cage on abrasion resistant valve or the
spring retainer on disc valves which is screwed onto the
seat. An anti-seizing lubricant applied to all threads is
good insurance against future difficulty.
THESE THREADS FOR
PULLING ONLY
NYLOCK SCREW
PISTON KEEPER
PISTON CUP
PISTON HUB
O-RING
PISTON ROD
LINER
STUFFING BOX
RETAINER PLATE
LOCK NUT
SPRING RETAINER
SPRING
VALVE DISC
VALVE STEM
PULLING THREADS
VALVE SEAT
VALVE SPRING
GUIDE CAGE
POLYURETHANE INSERT
VALVE BODY
O-RING
VALVE SEAT

Pentair myers aplex Series Specifications

General

Brand	Pentair
Model	myers aplex Series
Category	Water Pump
Language	English