Emerson EZH and EZHSO Series Pressure Reducing Regulators Manuale delle Istruzioni Scaricare il pdf (Pagina 16)

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Types EZH and EZHSO

For a single regulator, set the pilot to the desired outlet

(control) pressure according to the Pilot Adjustment procedure.

For a wide-open downstream monitor installation, 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, 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, adjust the setpoint

of the upstream monitor pilot to the desired maximum

pressure. Adjust the upstream working pilot 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 to its desired setpoint. Establish nal desired

downstream pressure by adjusting the downstream working

regulator pilot.

10. After adjusting the Type PRX pilot(s) to the desired

pressure setting(s), slowly open the downstream block

valve wide open.

11. Close the bypass valve, if used.

Type OS2 Manometric Box Set Point

Verication Procedure

Using the vent valve supply a pressure equal to the set

pressure foreseen for the regulator.

- 1

release relay stage

à Set (Stage 1)

- Slam-shut valve plug

à Open (Stages 2 and 3)

à Progressively increase the pressure until tripping occurs

à Adjust setting if necessary (NTAOS2). Note the

set point value on the equipment or mark it on a

commissioning document

STAGES 2 AND 3

TRIGGERED POSITION

STAGE 1

R121

Figure 15. Setpoint Verication Phase

Type PRX Pilot Adjustment

To adjust a standard Type PRX pilot, loosen the locknut, and

turn the adjusting screw.

Turning the adjusting screw clockwise into the spring case

increases the spring compression and pressure setting.

Turning the adjusting screw counter clockwise decreases the

spring compression and pressure setting

When the required pressure setting is maintained for several

minutes, tighten the locknut to lock the adjusting screw

in position.

Type PRX Pilot Restrictor and Damper

Screw Adjustment

Note

Recommended initial setting of the restrictor

screw is turned completely in (clockwise)

and then turned out 1/2 turn. The damper

screw initial setting is turned completely out

(counter clockwise).

The Type PRX/125 (upstream monitor pilot in

working monitor installations) does not have

a restrictor screw.

The restrictor screw of the Type PRX pilot can be used if there

is hunting of the set pressure. Slowly turning out the restrictor

screw (counterclockwise) will help steady the set pressure.

Turning out the restrictor screw will slightly decrease set

pressure, so adjustment of the pilot adjusting screw may

be necessary.

The damper screw can be turned in (clockwise) to slow the

response of the regulator. It is advisable that adjustment of

the damper and restrictor screws be limited to 1/4 turn at a

time to observe the response of the regulator(s).

SHUTDOWN

CAUTION

If the pilot bleed control line pressure is shut

down rst, the downstream system may be

subjected to full inlet pressure (Pu).

1. If the pilot setting must be disturbed, be sure to keep

some tension on the spring. This will prevent trapping

inlet pressure during blow down.

2. Slowly close the valves in the following order:

- Inlet block valve,

- Outlet block valve,

- Control line valve(s), if used.

3. Open the vent valves to depressurize the system.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 35 36

Types EZH and EZHSO 1
LABELLING 5

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Emerson EZH and EZHSO Series Pressure Reducing Regulators Manuale delle Istruzioni Pagina 16

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