Determining Closed Position - Fisher Vee-Ball V150 Instruction Manual

Instruction Manual
D101554X012
The NPS 1 through 2 has two notches, and can be rotated in either direction.

Determining Closed Position

1. The valve must be removed from the line to check the position of the ball.
WARNING
The Vee‐Ball closes with a shearing, cutting motion. To avoid personal injury, keep hands, tools, and other objects away
from the ball while stroking the valve.
2. Rotate the ball to the closed position.
3. Position the ball in the proper location
For Series B:
D When viewed from the valve body inlet, the ball is in the proper position when the flat spot on the top of the ball is
exactly in the center of the seal package.
Make a copy of the centering template in figure 27 out of a suitable stiff material. Place the centering template in the
opening at the seal (See figure 27). Find the center of the template and make sure the spot on the ball is centered
directly below it.
For NPS 1, 1-1/2, and 2 valves: Follow one of the procedures below:
D When viewed from the valve body inlet, the ball is in the proper position when both V‐notches of the ball are
centered between the machined diameter of the ledge that supports the seal.
D If the ball has a spot machined on the top, align that spot to the exact center of the seal cavity.
4. Adjust the actuator linkage as described in the appropriate actuator instruction manual until the ball is centered in
the closed position. A line is stamped on the actuator end of the drive shaft (see figure 23) to indicate the ball
position.
Use the appropriate actuator instruction manual and figure 23 of this manual when mounting the actuator or
changing actuator styles and positions.
The Micro‐Notch ball closed position is approximately 5 degrees closed from the first point of flow. This establishes the
zero degree position for the ball.
Vee-Ball Valves
June 2017
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