DiskFlo Control Valves
4
Ensure complete closure of the valve.
Note :
For valves with fail-open action, supply air pressure
under the actuator piston for closing the valve. The handwheel
can be used to close the valve, in case provided.
The valve needs to be supported for which, attach a hoist or
by some suitable means.
The line bolting should be removed. Pushing or pulling on
valve actuator should not be attempted to pry line flanges
apart.
The valve needs to be Slided carefully from the line. The valve
should not be twisted as this might cause damage to gasket
surfaces.
On complete removal of the valve from the line, the air
pressure from the actuator should be slowly relieved.
Removing Actuator From Body
With the actuator removed from the body, it is easy to dissemble
the body assembly and the actuator.The procedure for the same
is as follows To do so, proceed as follows:
Before disconnecting the actuator, from the body assembly,
support the actuator assembly by the lifting ring.
The transfer case cover bolts need to be removed. With care,
pry or slide the cover plate from the end of the shaft.
Loosen the linkage bolt on Mascot actuators.
To release spring pressure, loosen the actuator adjusting
screw.
The bolts connecting yoke to the actuator subassembly need
to be removed.
The entire actuator assembly needs to be slide off the shaft.
To loosen it from the shaft splines, it might be necessary to
wedge the halves of splined lever arm apart.
Disassembling the Body
Refer to Figures 1, 2 and 5 to disassemble the body and
proceed as instructed below :
For DiskFlo valves with seat retainer screws, the seat retainer
screws and retainer clips need to be removed. The seat
retainer needs to be lifted out of the valve body. (Presented in
Figures 1A, B, C).
For valves supplied with retainer snap-ring configu-ration,
insert a screwdriver carefully in the key slot provided in the
retainer; pry the retainer and snap ring out of the valve body.
(Presented in Figure 1D).
Remove both packing nuts to remove the gland flange. The
studs need not be removed.
By tapping on the small end of the pins using a punch and
hammer, drive the taper pins out of the disc.
Remove the end plug (optional bolted flange and seal if
applicable).
By inserting a press or a nylon rod (or identical material) into
body's blind end, and using a hammer, carefully tap the shaft
through the body and remove.
CAUTION :
Utmost care should be taken during disassembly so
that the splined end of the shaft is not damaged.
Supports underneath the disc are needed to avoid scratching
the sealing surface of the disc while removing the shaft. As
the shaft comes off the bearing surfaces, the binding of shaft
in the body is prevented.
Using a dowel of appropriate diameter, push the packing and
bearings out of the body. Packing needs to be pushed from
the center of the valve.
Reassembling the Body
To reassemble the body sub-assembly, refer Figures 1, 2, 3, and
5 and proceed as mentioned below :
All parts should be cleaned.
The disc seating surface should be checked to make sure it is
smooth and free of scratches and scoring.
CAUTION :
Damaged discs should be promptly replaced as
damaged or dirty seat surfaces can cause excessive seat wear and
high torque requirements.
Figure 2: Body Assembly
Note : Item numbers correspond to bill of material of Valve. Please refer to it for specific part numbers.
(Item No. 123)
Seat Retainer Clip
Seat Retainer Bolt
(Item No. 124)
Body
(Item No. 1)
Taper Pins
(Item No. 52)
Shaft Bearing
(Item No. 83)
Shaft
(Item No. 51)
Inner Packing
(Item No. 88)
Outer Packing
(Item No. 88)
Packing Follower
(Item No. 87)
Packing Spacer(s)
(Item No. 93 - 95)
Packing Retainer
(Item No. 85)
Shaft
Plug
(Item No. 122)
Disc
(Item No. 50)
O-ring
(Item No. 61)
Seat
Shaft
Bearing
(Item No. 83)
Disc Stop
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