Flowserve Handwheels and Limit Stop - Manual (Page 6)

5-6 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
NOTE: For correct neutral indication, it is important
to have the handwheel assembly in the neutral
position and the indicator nut between the neutral
marks before installing the indicator assembly in
the housing.
15. With two carriage screws, reinstall the position
indicator assembly, making sure the indicator gear
properly meshes with the pinion gear. Turn the
handwheel to the full open or closed position and
check for correct orientation; readjust if necessary.
With the new adhesive gasket, reattach indicator
cover plate.
16. Replace the housing O-ring.
17. Reattach the bellows and stem clamp to the yoke
and actuator stem.
18. Reassemble the cylinder according to instructions
found in IOM 2.
TOP-MOUNTED, CONTINUOUSLY
CONNECTED HANDWHEELS
Size 100 and 200 (Linear Actuators)
Operation
If air failure occurs, or if manual control of the valve is
desired, the top-mounted, continuously connected hand-
wheel can be operated as follows:
1. Set the three-way bypass valve (located on the
supply line to the positioner) to 'manual' to vent the
air pressure from the actuator.
NOTE: three-way valves are installed in the supply
line only when there is no lock-up system or volume
tank. On volume tank or lock-in-place systems, the
bypass valve is Iocated between the top and bottom
cylinder ports.
2. To open the valve, turn the handwheel counter-
clockwise to retract the plug.
3. To close the valve, turn the handwheel clockwise to
extend the plug.
4. To return the valve to automatic control, return the
handwheel nut to 'neutral' as shown by the hand-
wheel position indicator and set the three-way
bypass valve to 'auto.' The neutral position is indi-
cated when the top of the screw aligns with the red
line on the cap liner.
5. Adjusting the handwheel nut to a position other than
neutral provides a limit stop function, either limiting
opening or closing.
Maintenance
Since the top-mounted, continuously connected hand-
wheel is totally enclosed, there is generally no need for
periodic maintenance; however, disassembly may be
necessary if the mechanism fails. When reassembling
the handwheel, be sure to thoroughly clean and lubri-
cate the handwheel screw and drive nut with a multi-
purpose lubricant.
Figure 3: Top-mounted, Continuously
connected Handwheel
NOTE: Item numbers shown above correspond directly to the valve’s
bill of material. Refer to the bill of material for specific part numbers.
Disassembly
Refer to Figure 3:
WARNING: Repressurize line and actuator to atmo-
spheric pressure before disassembling the hand-
wheel or removing the actuator from the valve. Also,
make sure the handwheel screw is in the neutral
position before disassembly. Failure to do so can
cause serious personal injury to occur.
NOTE: These instructions are for air-to-open only.
Instructions for the air-to-close design is the same with
one exception: Pedestal bolts are not used to compress
the spring for air-to-close action; therefore, no spring
tension is released.
1. The handwheel may be disassembled while mounted
on the valve, or the actuator can be removed and
disassembled separately. If a change in the failure
action is required, the entire actuator subassembly
must be removed before proceeding (See 'Disas-
sembling Actuator' in Maintenance Bulletin 1). The
recommended procedure is to remove the actuator
subassembly from the valve.
Stem Lock Nut
(Item No. 350)
Cap Liner
(Item No. 374)
Cap Extension
(Item No. 387)
Handwheel Screw
(Item No. 388)
Gear Operator Bolts
(Item No. 334)
Pedestal Bolts
(Item No. 333)
Pedestal Gasket
(Item No. 378)
Spring Button
(Item No. 227)
Handwheel O-ring
(Item No. 276)
Stem Pin
(Item No. 372)
Piston Stem O-ring
(Item No. 272)
Actuator Stem
(Item No. 211)
Cap
(Item No. 381)
Gear Operator
(Item No. 393)
Stem Key
(Item No. 373)
Bolt Gasket
(Item No. 379)
Pedestal
(Item No. 389)
Spacer
(Item No. 383)
Bushing
(Item No. 390)
Handwheel Stem
(Item No. 380)
Spring
(Item No. 229)
Piston
(Item No. 225)
Actuator Spacer
(Item No. 228)