Table of Contents
Advertisement
INSERTING THE PLUNGER
EXTENSION
ROD
WIPER
BOX
Insert the extension rod through the wiper seals with
the tapered thread and entering FIRST. Do not move
the extension rod through the seals with wrenching
flats entering first. The sharp corners on the wrenching
flats may damage the seal lips, resulting in oil leakage.
With extension rod inserted through the wiper box
seals, thread the tapered threads (must be clean!) into
the tapered crosshead female threads. Firmly tighten
and apply torque to the wrenching flats only. Never
damage the extension rod ground surfaces!
Then fasten the wiper box to the power frame by
tightening the cap screws. Oil leakage between frame
face and wiper box is prevented by use of an O-ring.
STUFFING BOX, PACKING AND
PLUNGER ASSEMBLIES
GENERAL
Myers Aplex Series pumps all feature field removable
and replaceable stuffing boxes with plungers separable
from the extension rods.
If desired, the boxes, plungers, and packing units may
be installed (or removed) as a unit assembly, permitting
service outside the pump. All boxes are retained by
four (4) studs and nuts, and are centered in the frame
bore, ensuring correct alignment.
The plungers may also be removed separately (without
box removal) to facilitate repacking. With this option,
the necessary space required to remove plunger, it is
first necessary to remove the extension rod.
WRENCHING
FLATS
TAPERED
THREADS
25
SPRING LOADED PACKING
Compression Packing
SPACERS
GLAND RING
PACKING
GLAND RING
Chevron Packing
Note that the gland is screwed tightly onto the box
and contacts its face. The spring is providing all of the
initial compression and adjustment. No adjustment is
provided by the gland.
Since the force exerted by the spring is contingent on
the space provided for it, the correct lengths of all rings
is essential for good tensioning.
Spring:
A stiff Inconel
spring, which closely fits the bore of
®
the stuffing box, is used in this assembly. This spring is
compressed in a vise to the operating length required
plus 0.25" and tied with waxed nylon spot tie cord. The
cord is looped over the ends of the spring through the
coils and tied to maintain the length mention above.
Each spring is assembled into the stuffing box. Note
that the spring does not contact the plunger.
Spring-Guide Ring:
Plungers are heavy and the importance of a well-fitted
guide ring that carries this weight is often overlooked.
Discard any guide ring that becomes worn or scored, as
it will then not serve its purpose. It should fit snugly in
the box. Apply oil generously to this ring.
Spring Loaded Packing:
Three (3) rings of chevron or compression packing are
installed next. For compression packing, install them
with the skive intersections 180º apart to discourage
leaking.
Gland Ring:
This ring also fits the plunger and helps support the
plunger weight. Discard it if bore is worn, rough or out-
of-round. Lightly oil the ring before insertion. The gland
ring fits all packing.
SPRING GUIDE
SPRING
SPRING GUIDE
Advertisement
Table of Contents
