Flowserve Cast Flex Wedge Gate Valve - Manual (Page 19)

Cast Flex Wedge Gate Valves FCD ADENIM0010-02
19
6.0 DISASSEMBLY
(Continued)
6.1
Actuator Removal
Anchor/Darling Valves are supplied with a wide variety of actuating mechanisms. The degree of difficulty involved in
their removal varies significantly. Simple bolt-on units such as handwheels, gear units and electric motor units are
fairly commonplace. Their removal only requires the use of good mechanical practice. More complex pneumatic and
hydraulic units may require specialized skills. Their removal and disassembly should only be attempted by trained
personnel. More detailed information on special actuators will be provided in a separate manual when applicable.
The following general guidelines are provided for information:
1. Before any attempt to remove the actuator is made, personnel should verify that the system Is depressurized and
drained.
2. The valve should then be cycled partially to remove any trapped pressure and to insure that the disc is not stuck in
the seat.
3. The disc should then be gently lowered into the seat.
4. When the valve is to be completely disassembled, Anchor/Darling recommends that the actuator be removed from
the valve separately from the yoke. This will simplify the rigging requirements.
6.1.1 Handwheels
On handwheel actuated valves (Fig. 7) the handwheel can be removed by removing the retaining ring (261)
and pulling the handwheel (136) off the yoke sleeve (017). Care should be taken not to lose the handwheel
keys (135).
NOTE: If desired, the yoke and handwheel assembly may be separated from the valve In one piece. Once the yoke-
bonnet fasteners are removed, the entire assembly can be raised off the stem by turning the handwheel while the
yoke is held stationary.
If further disassembly of the handwheel mechanism is required, the yoke cap capscrews (228) and the yoke cap (019)
must be removed first. Then the thrust bearing (352) and the yoke sleeve (017) can be lifted out of the yoke.
6.1.2 Gear Actuators
Two types of gear actuators have been supplied on Anchor/Darling valves. Earlier model valves may have
been supplied with gear units manufactured by Anchor/Darling (Fig. 8). This type of unit requires complete
disassembly in order to remove it from the yoke. Specific instructions on disassembly were provided with the
original equipment. Anchor/Darling service engineers can provide duplicates of this Information when
provided with the original order or drawing number. Later model valves (Fig. 9) are supplied with self-
contained units that can be separated from the yoke by removing the actuator capscrews (218). If a stem
protector is provided, it should be removed. With the actuator properly supported, it may be raised off the
yoke either by turning the handwheel or rotating the entire unit.