Assembly - Fisher CV500 Instruction Manual

Instruction Manual
D101640X012
3. Rotate the drive shaft (key 3) to move the ball (key 2) into the open position.
Note
The retainer (key 5) was installed at the factory using the torque listed in figure 5.
CAUTION
After performing the following procedures, place the retainer, the seat ring, and both face seals on a protected, flat surface
where the threads and inner surface will not be contaminated or damaged.
4. Remove the retainer (key 5) by engaging the retainer tool, attaching an impact wrench or other suitable tool, and
unscrewing the retainer. Inspect the retainer. Place it on a protected, flat surface where the threads and inner
surface will not be contaminated or damaged.
5. Remove the retainer gasket (key 11). Inspect the gasket surface in the valve body.
6. Lift out the seat ring (key 4) and both face seals (key 8). Inspect the parts and place them on a flat, protected
surface.
7. Inspect the shutoff surface of the V‐notch ball. If it is worn, nicked, or scratched, proceed to the Replacing Ball,
Shaft, and Bearings procedure in this manual. If the parts are in good condition and do not require replacement,
continue to the Assembly procedure in this manual.

Assembly

WARNING
Seat ring installation requires that the ball (key 2) remain in the open position.
The ball closes with a shearing, cutting motion, which could result in personal injury. To avoid personal injury or damage to
tools, valve parts, or other items resulting from the ball closing, prevent against ball travel by using travel stops, manual
actuators, constant supply pressure to a pneumatic actuator, or other steps as appropriate. When installing the seat ring,
keep hands, tools, and other objects out of the valve.
1. Apply enough supply pressure to the actuator to open the ball, or take other steps to hold the ball open.
2. Clean the valve body, the retainer threads, the retainer gasket surface, and the seat ring sealing surface.
3. Using either face seals (key 8) in good condition or new face seals, place one seal in the seat ring cavity of the valve
body.
Note
The seat ring (key 4) may have one or two shutoff surfaces. The shutoff surfaces are the narrow, rounded edges of the seat ring
bore. Inspect the seat ring and locate the shutoff surfaces before proceeding.
Make sure the ball (key 2) is open while you install the seat ring (key 4) and retainer ring (key 5). Before installing the
seat ring, open the ball or plug.
CV500 Valve
June 2017
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