Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de instrucciones descargar pdf (Pagina 8)

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Types EZH and EZHSO

DESCRIPTION

The Types EZH and EZHSO regulators consist of:

• Version without Integral Slam-Shut Valve:

- An "E Body" or an "X Body plus a cap"

- A compensation valve, an interchangeable orice

- An actuator with position indicator

- A pilot system adapted to the required pressure setpoint

• Version with Integral Slam-Shut Valve:

- Same parts and sub-assemblies as in the version

without slam shut

- An "X Body"

- A valve with tight shut-off O-ring

- An automatic slam-shut bypass

- A release relay Type OS2 (see instruction manual

NTAOS2) consisting of:

· A mechanism box (BM)

· A safety manometric box (BMS) connected to the

outlet side of the regulator

PRINCIPLE OF OPERATION

Type EZH — Spring-to-Close Version

Type EZH Single-Pilot Regulator

(Figures 9 and 10)

The pilot-operated Type EZH uses inlet pressure as the

operating medium, which is reduced through pilot operation

to load the actuator diaphragm. Outlet pressure (Pd)

opposes the motorization pressure (Pm) in the actuator and

also opposes the pilot control spring.

When the outlet pressure (Pd) drops below the setting of

the pilot control spring, pilot control spring force on the

pilot diaphragm thus opens the pilot valve plug, providing

additional motorization pressure (Pm) to the actuator

diaphragm. This diaphragm motorization pressure opens

the main valve plug, supplying the required ow to the

downstream system.

Any excess motorization pressure on the actuator diaphragm

escapes downstream through the bleed restriction in

the pilot.

Figure 9. Type EZH DN 25/50/80 (Spring-to-Close Version) Operational Schematic

R98

FILTER

TYPE

SA/2

TYPE

PRX/120

TYPE EZH

UPPER

DIAPHRAGM

LOWER

DIAPHRAGM

REGULATOR

DIAPHRAGM

PILOT DISK

TYPE PRX:

S - BLEED PORT TYPE SA/2

B - SUPPLY PORT V - SENSING

L - MOTORIZATION PORT R - PILOT

A - SENSING PORT M - INLET

Inlet pressure (Pu)

Outlet pressure (Pd)

Motorization pressure (Pm)

Pilot feeding pressure (Pup)

Atmospheric pressure (Pb)

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 35 36

Types EZH and EZHSO 1
LABELLING 5

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Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de instrucciones Pagina 8

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