DeZurik G12-C8 Manual - Halaman 6

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DeZURIK

Cylinder Operated G-Series Actuator

Adjusting Position Stops

Adjusting Closed Position Stop

On 6A and 12A cylinder actuators, the Closed Position Stop is located in the end of the cylinder. See

Figure 2. The cylinder must be mounted before adjusting the position stop.

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.

1. Discontinue flow and relieve pipeline pressure.

2. Open the valve and loosen the Closed Position jam nut.

3. Back out the Closed Position set screw about 1½ turns.

Close the valve with the pressure specified in Table B for the appropriate size and pressure

direction—

See Figure 3.

Direct Pressure (higher pressure is at end opposite the seat); use the cylinder pressure

specified in Table B for 25 psi (172 kPa) reverse pressure drop.

Reverse Pressure (higher pressure is at seat end of valve); use the cylinder pressure specified

in Table B for the amount of reverse pressure drop in your pipeline.

The pressure in Table B will provide tight shut off or minimum leakage (depending on pressure drop)

with maximum plug life. If the reverse pressure drop in the pipeline is unknown, set closing pressure for

the maximum pressure drop. Reset the closing pressure as soon as actual pressure drop can be

determined because the maximum setting decreases plug life.

5. Maintain pressure for 5 minutes to allow the plug to seat, then lock the Closed Position setscrew

in place with the jam nut.

NOTE: Make sure the thread seal is positioned properly, and lock the setscrew in place with the jam nut.

D10455

(Continued)

Figure 3 – Pressure Direction

Page 6

August 2012