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Standard Square
SafeGuard
(packing studs rotated 45 degrees)
DISASSEMBLY AND REASSEMBLY
Removing Valve From Line
If an internal problem is suspected with the valve and
disassembly is required, remove the valve from the line
by proceeding as follows:
WARNING: Depressurize line to atmospheric pres-
sure, drain all process fluids and decontaminate the
valve (if caustic or hazardous materials are
present). Failure to do so can cause serious injury.
1. Make sure the valve is fully closed.
CAUTION: On valves with fail-open action, the
air pressure must be supplied under the piston
to close the valve. If the valve is supplied with
a handwheel, it can be used to close the valve.
Failure to do so will damage the valve disc upon
removal from the line.
2. Attach a hoist or some means to support the valve.
3. Remove the line bolting. Do not attempt to pry the
line flanges apart by pushing or pulling on the valve
or actuator.
37-4
Standard Single "V"
SureGuard
Figure 2: Typical Packing Configuration
Twin "V"
SafeGuard / SureGuard
Fire-safe Option
(live-loading omitted)
4. Slide the valve carefully from the line. To avoid
damage to gasket surfaces, do not twist the valve.
5. After the valve is completely removed from the line,
slowly relieve air pressure from the actuator.
CAUTION: On valves with fail-open action, the
actuator spring will cause the disc to open.
Make sure the disc will not strike any object
upon opening. Protect disc edges from damage.
Removing Actuator From Body
In most cases, both the body assembly and the actuator
are easier to disassemble with the actuator removed
from the body. To do so, proceed as follows:
1. Support the actuator assembly by the lifting ring be-
fore disconnecting it from the body sub-assembly.
2. Depressurize actuator and allow it to move to its fail
position.
3. Remove the bolts connecting the yoke to the actua-
tor subassembly.
4. Slide the entire actuator assembly off the valve
shaft.
Twin "V" with
Lubricator
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