CVS 1051 Series, Инструкция по эксплуатации

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Figure 5: Lever Operating Clearance
Turnbuckle Adjustment
Warning: The sudden release of process
fluid can cause personal injury or property
damage. Prior to starting adjustment
procedures:
• Isolate the valve from the process,
• Release the process pressure, and
• Vent the actuator loading pressure.
Correct turnbuckle adjustment ensures the valve is
correctly closed when the actuator is against its
travel stops. Refer to Figure 7 for Key Numbers.
For accurate adjustment to the zero-degree valve
ball position, remove the valve from the pipeline.
Refer to instructions in the appropriate valve body
instruction manual.
A regulated air supply will be required to stroke the
actuator. Consult Table 4 for the sizes of the three
open-end wrenches required for the procedure.
Note: To achieve the most accurate
adjustment of the actuator, do not remove
the cover during this procedure (Key 41).
Table 4: Wrench Sizes Required for
Turnbuckle Adjustment, In
Actuator
Size
Turnbuckle
(Key 16)
Lower
Locknut
(Key 14)
Upper
Locknut
(Key 18)
30 15/16 1/2 7/8
40 1-1/8 3/4 1-1/8
60 1-5/16 15/16 1-5/16
1. Remove the access plate (Key 11) and machine
screws (Key 29) if included.
2. Loosen the lower locknut (Key 14).
3. Ensure that there are no tools or instruments
within the actuator housing and blocking the
stroke path. Add pressure to the diaphragm
casing to stroke the actuator down and provide
access to the left-hand threaded upper locknut
(Key 18). Loosen the locknut.
4. Use one of the following according to the service
required by the actuator:
a. Push-Down-To-Close: Slowly stroke the
actuator to the down travel stop. Determine
the closed position of the valve according to
the appropriate valve body manual. Adjust
the turnbuckle until the valve is in the closed
position and lock this adjustment with the
left-hand threaded locknut (Key 18). Stroke
the actuator to the mid-travel position and
tighten the locknut (Key 16).
b. Push-Down-To-Open: Determine the
closed position of the valve according to the
appropriate valve body manual. Release all
pressure from the diaphragm casing and
ensure that the diaphragm is against its up
travel stop. Check the valve position and
stroke the actuator so the turnbuckle (Key
16) is accessible through the access
opening. Adjust the linkage, release
pressure to the actuator and check the new
adjustment. Continue this procedure until the
valve is in the closed position when the
actuator is resting on its up travel stop.
Tighten the locknut (Key 14), stroke the
actuator and tighten the left-hand threaded
locknut (Key 18).
5. Replace the access plate (Key 11).
6. Loosen the self-tapping screws (Key 7), adjust
the travel indicator (Key 38) and retighten the
self-tapping screws.
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