VFlo Control Valves
4
Support the valve with a hoist or some means.
Line bolting should be removed. Do not push or pull on the
valve or actuator to pry line flanges apart.
Valve needs to be slided from the line, carefully. Do not twist
the valve or it will cause damage to the gasket surfaces.
Slowly relieve air pressure from the actuator on complete
removal of valve from the line.
Removing Actuator From Body
The design of the 3 to 12-inch VFlo valves permits disassembly
without removing the Mascot actuator. However, it is advisable
to remove the actuator. Follow the proper actuator installation,
operation, maintenance instructions, and proceed as follows:
Before disconnecting it from the body assembly, support the
actuator assembly.
The spring compression is to be released by loosening the
actuator adjusting screw.
Remove the actuator transfer case cover bolts, carefully pry or
slide the cover plate from the transfer case, then loosen the
linkage bolt - On Mascot actuators.
The bolts connecting the yoke to the body subassembly need
to be removed.
The entire actuator assembly should be slided off the shaft. To
loosen it from the shaft splines, it may be required to wedge
the splined lever arm apart.
DISASSEMBLY AND REASSEMBLY
Disassembling the Body
Although not necessary, it is advisable to remove the actuator
from the body assembly to disassemble 3 to 12-inch bodies. It is
necessary to loosen the valve shaft (On valves) from the actuator
prior to body disassem-bly. Figures 1, 2 and 5 should be
referred to and below mentioned procedure must be followed :
Seal retainer and seals removal
Screw-in style
- Loosening the retainer by turning it
counterclockwise and removing it from the body. (A special
cross-wrench tool is available with the factory and can be
ordered. Refer Table IV.) Remove the metal seals. The soft seal
needs to be removed, if applicable.
Lock-ring style -
certain valve designs have a retaining ring
held in with set screws. For removing it, the set screws in the
lock ring need removal, then the re-taining ring is to be
removed, lock ring and seal retainer finally. The retaining ring
can be forced out using a flat-headed screwdriver and pliers -
if the lock ring set screws do not loosen. Remove the seals.
By removing both packing nuts, remove the gland flange.
Removing the studs is not necessary.
On rotating post designs,
both the shaft and post pins need
to be driven into the center of the shaft and posted until the
outward end of the pin clears the ball. Care should be
exercised not to damage the post or shaft. Pins must be then
punched out of the shaft and posted when they are removed
from the valve. Remove the shaft plug, O-ring and finally the
rotating post. For removing the post, insert a bolt in the jack
screw hole, tapped in the post.
On stationary post designs,
drive the shaft pin into the
center of the shaft until the outward end of the pin clears the
ball splines. Care should be taken, not to damage the shaft.
After the shaft is removed, the pin can then be punched out
of the shaft. The anti-rotation clamp must be removed. The
post and the post O-rings should be removed.
From 3 through 12-inch designs, for removal, the shaft needs
to be pulled through the outboard end of the body. On 1
through 2-inch designs, removal of the shaft is by pulling it
out through the inboard end of the body
CAUTION :
Care must be taken during disassembly so
that the splined end of valve shaft does not get damaged.
1.
2.
3.
4.
1.
2.
3.
4.
5.
1.
2.
3.
4.
Packing
(Item No. 88)
Packing Stud
(Item No. 109)
Gland Flange
(Item No. 80)
Packing Nut
(Item No. 117)
Shaft
(Item No. 51)
Packing Follower
(Item No. 87)
Packing Spacer
(Item No. 93)
Post
(Item No. 123)
Post O-ring
(Item No. 64)
(optional)
Inboard End
Shaft Bearing
(Item No. 83)
Retainer O-rings
(Item No. 59)
(Item No. 56)
Retainer
(Item No. 30)
Plug
(Item
No. 122)
O-ring
(Item No. 61)
Pin
Ball
Post Bearing
(Item No. 52)
(Item No. 50)
(Item No. 84)
Thrust Bearing
(Item No. 53)
Body
(Item No. 1)
Seals*
Figure 2: 1" & 2" VFlo Body Assembly
(*See Figure 4 for seal configurations and item numbers.)
Note : Item numbers correspond to bill of material of Valve. Please refer to it for specific part numbers.
