DeZURIK
RCV Rotary Control Valves
June 2017
Page 15
D10361
Actuator Closed Position Stop Adjustment
1. Open the valve until the plug does not touch the seat, then move the plug toward the closed
position until the plug just touches the complete circumference of the seat.
2. Turn the closed position stop screw clockwise until resistance is felt, then turn the stop screw
counterclockwise one half turn. While holding the stop screw from turning, tighten the jam nut to
the torque listed in the actuator instructions.
3. To adjust the open position stop, see the actuator instructions.
4. Install the valve in the pipeline as described in the INSTALLATION section of these instructions.
5. If the actuator is a powered actuator, reconnect power to the actuator.
6. The pipeline may now be pressurized. Once pressurized, verify that the valve is sealing
properly.
a. If seat leakage occurs, adjust the closed position stop until seat leakage stops.
b. If packing leakage occurs, tighten the gland nuts (A8) evenly and slowly, just enough to stop
the leakage.
Troubleshooting
Condition
Possible Cause
Corrective Action
Packing leaks.
Packing is loose.
Adjust packing gland.
Packing is worn.
Replace packing.
Valve leaks when fully closed.
Seat is worn.
Replace seat.
Valve leaks when fully closed,
and plug is galled.
Plug is worn or galled.
Replace plug and seat.
Valve body leaks from body
joint.
Pipeline flange bolting is loose.
Tighten pipeline flange bolts or
studs.
Gasket is worn.
Replace gasket(s).
Opening/closing torque is
excessive.
Bearings, shafts, plug, and/or
seat are worn.
Replace worn part(s).
