Emerson EZH and EZHSO Series Pressure Reducing Regulators Manuál s instrukcemi stáhnout pdf (Strana 11)

EZH and EZHSO Series

Pilot Adjustment

For PRX Series pilots (Figure 13), loosen locknut

(key 2) and turn the adjusting screw into the spring

case to increase (or out of the spring case to

decrease) the downstream pressure. When the

required downstream pressure is maintained for

several minutes, tighten the locknut to lock the

adjusting screw in position.

PRX Series Pilot Restrictor and

Damper Screw Adjustment

Note

Recommended initial setting of the

restrictor screw is turned completely in

(clockwise) and then turned out 1 turn.

The damper screw initial setting is turned

completely out (counterclockwise).

The Type PRX/125 (upstream monitor

pilot in working monitor installations)

does not have a restrictor screw.

The Damper and Restrictor screws on the PRX Series

pilot control the regulator’s proportional band (droop)

and speed of response. For additional tuning follow the

steps outlined below, refer to Figure 13.

1. Start with the restrictor screw (R) 1 turn

counterclockwise from fully seated (turn restrictor

fully clockwise then 1 turn counterclockwise) and

the damper screw (D) fully counterclockwise.

2. Turn damper screw clockwise until desired

performance is achieved. This reduces the ow

path of the damper. If the damper becomes

fully seated (no longer able to turn clockwise)

and the desired performance has not been

achieved, return the damper screw to the fully

counterclockwise position.

WARNING

The damper screw should not be left in

the fully seated position, as it will lock

the regulator in last position which could

cause incorrect pressure regulation.

3. Turn the restrictor screw an additional turn

counterclockwise from fully seated. This increases

the ow path of the restrictor. If additional tuning

is required, repeat step 2. Follow this method until

desired performance is achieved.

Startup

For EZH Series

1. Make sure all block valves, vent valves and

control line valve(s) are closed.

2. Back out the pilot adjusting screw(s).

3. Slowly open the valves in the following order:

a. Inlet block valves

b. Pilot supply and control live valve(s), if used

4. Crack open the outlet block valve or bypass valve

to allow minimum ow.

For a single regulator (Figure 3), set the pilot to

the desired outlet (control) pressure according to the

Pilot Adjustment procedure.

For a wide-open downstream monitor installation

(Figure 5), adjust the upstream working pilot until

intermediate pressure is higher than the desired

setpoint of the monitor pilot. Adjust the downstream

monitoring pilot to the desired monitoring takeover

pressure. Reduce the upstream pilot to the normal

outlet pressure setting.

For a wide-open upstream monitor installation

(Figure 5), adjust the downstream working pilot to a

setpoint higher than the setpoint of the monitor pilot.

Adjust the upstream monitoring pilot to the desired

monitoring takeover pressure. Reduce the downstream

pilot to the normal outlet pressure setting.

For a working monitor installation (Figure 6),

adjust the setpoint of the upstream monitor pilot

Type PRX/125 to the desired maximum pressure.

Adjust the upstream working pilot Type PRX/120 to

the desired intermediate pressure setting. Adjust the

downstream pilot to a pressure setting slightly above

the upstream monitor pilot pressure setting. Adjust the

upstream monitor pilot Type PRX/125 to its desired

setpoint. Establish nal desired downstream pressure

by adjusting the downstream working regulator pilot.

5. After adjusting the PRX Series pilot(s) to the

desired pressure setting(s), slowly open the

downstream block valve wide open.

6. Close the bypass valve, if used.

For EZHSO Series

1. Make sure all block valves, vent valves and

control line valve(s) are closed.

2. Back out the pilot adjusting screw(s).

3. Introduce upstream pressure by slowly opening

inlet valve.

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Emerson EZH and EZHSO Series Pressure Reducing Regulators Manuál s instrukcemi Strana 11

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