DeZurik G-SERIES Manual - Página 6

Navegue en línea o descargue pdf Manual para Controlador DeZurik G-SERIES. DeZurik G-SERIES 17 páginas. Lift, turn and reseat used on ptw & pfw tapered plug valves
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DeZURIK

Stop Adjustments

The open and closed position stops prevent the valve plug from rotating beyond the optimum open and

shutoff positions.

If the actuator is factory-mounted on the valve, the stops are preset, and do not require further

adjustment. If the actuator is not factory mounted on the valve, or if the actuator has been removed, the

stops will require adjustment as described below; also refer to the Valve Instructions for specific closed

position requirements for the valve.

Valves can be mounted with Direct or Reverse pressure.

Direct Pressure - When the higher pressure is at the end opposite the seat. See Figure 3.

Reverse Pressure - When the higher pressure is at the seat end of the valve. See Figure 3.

To Adjust the Closed Position Stop

See Figure 5 for stop Identification.

To adjust the closed position stop: (see Figure 5 for stop identification) Adjusting

stops with flow in the pipeline can allow the valve to close causing personal

injury and damaging the flow system.

Shut down the flow and relieve pipeline pressure before making stop adjustments

1. Discontinue flow and relieve pipeline pressure.

2. Close the valve.

3. Loosen the nut on the closed position screw, and back out the screw about two turns.

4. Turn the handwheel, chainwheel or 2" wrenching square operator until the specified Actuator

Input Torque from Table A is reached.

5. While maintaining the Actuator Input Torque from Table A, turn the closed position screw

clockwise until resistance is felt from the screw contacting the gear (B1C).

6. Prevent the screw from turning and tighten the nut against housing (B1A).

7. Pipeline flow may now be restored.

D10456

Figure 3— Pressure Direction

Page 6

August 2012