Instruction No EF 5000 E
01/2004
11
E.
Place seat ring on a flat surface with the seating
area facing up.
F.
Apply a small amount of fine grinding compound
to the seat ring seating surface.
G.
Lap the plug lightly against the seat ring while
turning and oscillating the plug in all directions.
H.
Clean seat ring, plug and valve body thoroughly
in preparation for reassembly.
9.2.2 Soft Seat
Do not lap the soft seat ring to the plug ; however, the
seat ring must be lapped to the valve body. The
procedure for lapping the seat ring to the body is the
same as stated in items A. through D of section 9.2.1
on Hard Seats.
9.3
YOKE ASSEMBLY
(Refer to figures
16 and 17)
Maintenance required on the yoke (33) is limited to
replacement of the grommet (12) and the shaft
bearing (8). To replace either, the actuator must be
separated from the body. (Depending on the type of
actuator used, refer to appropriate section). Insert
the grommet into the yoke with the recessed part of
the grommet towards the shaft bearing. The shaft
bearing (8) is slip fit into the yoke and is removed by
pushing it out towards the grommet.
10.1 SPRING DIAPHRAGM ACTUATOR
When the actuator has been disassembled using
section 8.2 to reassemble the actuator, proceed as
follows:
A.
Replace spring (39) in piston (43).
B.
B. Replace washer (44) and locknut (45).
Note: Locknut (45) must be threaded the full
length of the threads.
C.
To reassemble the diaphragm and upper
diaphragm case, refer to section 9.1, steps E.
through L.
D.
Replace locknut (46) and clevis (35).
E.
Determine correct orientation and replace
actuator on yoke and replace lockwashers (37),
capscrews (36) and tighten firmly.
F.
Refer to section 11. for actuator stem
adjustment.
10.2 SPRING DIAPHRAGM ACTUATOR
ON BODY S/A
(Refer to figures 16 and 17)
After completing the required maintenance or
changing valve, actuator and yoke assembly,
reassemble using the following procedure:
A.
Determine correct valve to actuator orientation.
B.
If required, reposition body studs (28) and
packing flange studs (13).
Note: Depending on the actuator position, insure
that the body studs (short studs) when placed
through the yoke holes will be positioned in the
front of the yoke opening for ease of accessibility.
C.
Insure that grommet (12) and shaft bearing (8)
are in the yoke. Turn shaft so the plug is in the
closed position.
D.
Slide the valve shaft partly into the lower yoke
opening, allowing enough room to place packing
flange (14) over the shaft (19).
Note: Packing flange (14) is placed on the shaft
(19) with the concave side toward the valve
packing (17).
E.
Insure slots in packing flange (14) line up with
packing flange studs (13).
F.
With packing flange on the shaft, continue sliding
the valve shaft toward the yoke (33) and through
the grommet (12) in the yoke (33).
G.
Place the lever (34) in the yoke and in line with
the shaft so the boss on one side of the lever
shaft hole is toward the shaft bearing (8) and
engage the shaft to the lever splines.
Note: Shaft must engage lever so the indicator dot
on the clevis pin, when placed in the lever hole,
shows the valve closed. Temporarily place clevis
pin into lever (34) and check indicator dot alignment.
Dot should just start touching the closed indicator
line on the front cover (32) (Refer to figure 18). If the
orientation is not changed, align lever and mark on
yoke then check alignment. (Refer to figure 17).
H.
Slide shaft completely through lever to engage
shaft bearing (8). Yoke should now be fully
seated on the valve bonnet flange.
Caution: Insure the bearing seat in the yoke is
clean. The bearing should slide in
easily. Do not use excessive force to push
bearing in.
10. Reassembly Procedures
Caution: Do not use air pressure to check
alignment, since during normal operation and
with full air pressure, the Indicator may
overshoot the closed Indicator mark on the
cover. This is acceptable.
