Emerson EZH and EZHSO Series Pressure Reducing Regulators Manuel d'instructions télécharger pdf (Page 10)

EZH and EZHSO Series

Note

Separate sensing lines must be used for

the “S” and the “A” ports.

CAUTION

To prevent damage to the pilot during

Startup, the sense and bleed lines

should be located on the same side of

the downstream block valve.

7. Install hand valves in the downstream sense and

bleed lines if desired. If hand valves are installed,

they should be full ow valves, such as a full port

ball valve. For EZHSO Series installation, a vent

valve downstream of the regulator is needed. It

should be installed directly in the PRX Series pilot

bleed line connection (line from Port S to pipe).

A full bore NPS 1/4 ball valve for the vent line is

preferred to provide sufcient ow.

8. For optional remote pneumatic loading of a

PRX Series pilot, make the spring case piping

connections just as they would be made for

remote venting in step 4.

Wide-Open Monitor Regulator

1. Follow the procedures in the All Installations section

and then continue with step 2 of this section. The

sense and bleed control lines of both the upstream

and downstream pilots will be connected to the

downstream piping (see Figure 5).

2. Connect the pilot supply line for the downstream

regulator to the outlet “R” port of the Type SA/2

pilot supply lter regulator.

Working Monitor Regulator

1. Follow the procedure in the All Installations

section and then continue with step 2 of this

section. The sense line of the upstream monitor

pilot (from Port A on the Type PRX/125) and

the bleed (Port S) and sense lines (Port A) of

the downstream pilot will be connected to the

downstream piping (see Figure 6).

2. Connect an inlet supply line from the upstream

piping to the inlet “M” port of the downstream

Type SA/2 pilot supply lter regulator.

3. Connect a control (sense) line from the “A” port

of the upstream working Type PRX/120 pilot to

the intermediate pressure portion of piping, using

3/8 in. / 9.5 mm or larger outside diameter tubing.

4. Connect a downstream bleed line from the “S” port

of the upstream working Type PRX/120 pilot to

the intermediate pressure portion of piping, using

3/8 in. / 9.5 mm or larger outside diameter tubing.

Startup and Adjustment

Pre-startup Considerations

Each regulator is factory-set for the outlet pressure

specied on the order. If no setting was specied,

outlet pressure was factory-set at the mid-range of

the pilot control spring. Before beginning the start-up

procedure in this section, make sure the following

conditions are in effect:

• Block valves isolate the regulator

• Vent valves are closed

• A bypass, if any, is in operation

In all cases, check the pilot control spring setting to

make sure it is correct for the application.

CAUTION

Be sure to slowly introduce pressure

into the system to prevent downstream

overpressure due to potential rapid

pressure increase. Pressure gauges

should always be used to monitor

downstream pressure during Startup.

Procedures used in putting this

regulator into operation must be planned

accordingly if the downstream system is

pressurized by another regulator or by a

manual bypass.

Note

When using a Type SA/2 pilot supply

lter regulator, the differential pressure

across the main regulator must be at

least 45 psid / 3.1 bar d for optimum

regulator performance. The Type SA/2

can be removed if differential pressure

across the main regulator is less than

45 psid / 3.1 bar d and inlet pressure

stays at or below 200 psig / 13.8 bar.

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Emerson EZH and EZHSO Series Pressure Reducing Regulators Manuel d'instructions Page 10

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