Replacing Ball, Shaft, And Bearings; Disassembly - Fisher CV500 Instruction Manual

Instruction Manual
D101640X012
Insert a screwdriver, pry bar, or similar tool between the lower ear of the ball and the valve body. Use the pry to move
the ball tightly against the thrust washer and bearing stop (key 7) on the actuator side of the valve. Keep the ball in
that position until you finish installing the seat ring.
4. Insert the seat ring into the seat ring cavity with the correct shutoff surface facing the V‐notch ball and shaft. The
seat ring will cover the face seal installed in step 3.
5. Place the second face seal (key 8) on the seat ring (key 4).
6. Apply anti‐seize lubricant to the gasket surface in the valve body. Install the gasket (key 11), while making certain
that the concave surface of the gasket is up (hump surface of gasket down).
7. Apply anti‐seize lubricant to the threads and bottom of the retainer (key 5) only in the area that contacts the gasket.
Thread the retainer into the valve body.
8. Refer to figure 5. Find the correct retainer torque for the valve size. With the appropriate tool, tighten the retainer
to the torque listed in figure 5.
9. A gap between the seat ring (key 4) and retainer (key 5) allows the seat ring to self‐center. Applying the proper
amount of torque during installation should position the retainer and seat ring properly. Use a feeler gage to
measure between the parts as shown in figures 9 and 10, making certain the necessary clearance exists. Compare
the measured gap to the clearance in table 4; proceed as follows:
D If the measured clearance is within table values, proceed to the next step.
D If the measured gap is larger than the maximum, tighten the retainer‐‐apply more torque than that listed in figure 5,
if necessary, until the clearance is within maximum and minimum values.
D If the measured clearance is smaller than the minimum, remove the retainer, seat ring, and face seals, clean the
parts, and reassemble so as to obtain the necessary minimum clearance.
10. Perform the Adjusting Actuator Travel procedure in this manual and then install the control valve in the pipeline.

Replacing Ball, Shaft, and Bearings

Perform this procedure to replace the ball (key 2), expansion pin (key 9), taper pin (key 10), drive shaft (key 3), follower
shaft (key 38), groove pins (key 39), or bearings (keys 6 and 42). These parts are independently replaceable; for
example, installing a new ball does not require replacing a reusable valve shaft or expansion pin assembly. For key
numbers refer to figure 9 for NPS 3 through 8 and to figure 10 for NPS 10 and 12 unless otherwise indicated.

Disassembly

WARNING
To avoid personal injury resulting from contact with edges of the V‐notch ball (key 2) and seat ring (key 4) during ball
rotation, stay clear of its edges when rotating the ball. To avoid damage to tools, valve parts, or other items resulting from
V‐notch ball rotation, keep tools and other property away from the edges of the ball.
The ball closes with a shearing, cutting motion, which could result in personal injury. When the actuator is removed from
the valve, the ball/shaft assembly may suddenly rotate, resulting in personal injury or property damage. To avoid injury or
damage, carefully rotate the ball/shaft assembly to a stable position in the valve body after the actuator is disconnected.
CAUTION
To avoid increased leakage, increased valve component wear or possible damage to the valve body (key 1), ball (key 2),
drive shaft (key 3), follower shaft (key 38), and bearings (keys 6 and 42) resulting from a sharp blow to the actuator or valve
parts, use a wheel puller to separate the actuator parts from the valve drive shaft.
CV500 Valve
June 2017
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