DeZURIK
RCV Rotary Control Valves
D10361
Page 8
June 2017
Seat Replacement
See Figure 1 and Figure 2 for parts identification.
Pipeline pressure can cause personal injury or equipment damage. Relieve the
pressure in the pipeline before removing flange bolts and flanges.
1. Relieve pressure in the pipeline and drain the pipeline.
Accidental operation of powered actuator can cause personal injury or equipment
damage. Disconnect and lock out power to actuator before servicing.
2. If the actuator is powered, disconnect and lock out the power to the actuator.
3. Remove the flange bolting, and remove the valve from the pipeline.
4. Remove the two screws (A4), and remove the seat retainer (A3) and gasket (A5) from the body
(A1).
5. Remove seat (A16).
6. Clean all gasket and/or seat material from the body and seat retainer.
7. Position the plug in the valve body so it is centered in the valve flow-way.
NOTE:
The plug will be positioned at an angle.
8. Apply a light coat of media-compatible grease to the beveled edge of the seat that rests against the
plug when assembled.
NOTE:
When replacing a tungsten carbide seat, DeZURIK recommends replacing the plug and
seat together as a matched set. In order to minimize seat leakage the ball and seat must be
lapped together at the factory.
9. Place the seat (A16) into the valve body with the beveled side of the seat toward the plug. If a
reduced trim seat with offset orifice is being installed, position the orifice in the 3 o'clock position as
shown in Figure 3.
10. Rotate the plug toward the open position, then rotate the plug back toward the closed position until
it just touches the complete circumference of the seat.
11. Place the seat retainer gasket (A5) in the body.
12. Place the seat retainer (A3) in the valve body with the timing mark, which is located on one of the
retainer screw cutouts, toward the valve neck as shown in Figure 4.
