Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de instrucciones descargar pdf (Pagina 9)

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Types EZH and EZHSO

Figure 10. Type EZH-OS2 DN 100 (Spring-to-Close Version) Operational Schematic

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)

Type EZHSO — Spring-to-Open Version

Type EZHSO Single-Pilot Regulator

(Figures 11 and 12)

CAUTION

The pilot-operated Type EZHSO (Spring-to-

Open version) will fail in open position in

case of main valve diaphragm failure or lack

of pressure supply to the pilot (see Table 4

for Failure Mode Analysis).

When the gas demand in the downstream system has

been satised, the outlet pressure (Pd) increases. The

increased pressure is transmitted through the downstream

control line and acts on the pilot diaphragm. This pressure

exceeds the pilot spring setting and moves the Type PRX

diaphragm, closing the Type PRX orice and interrupting

the motorization pressure supply to main valve actuator.

The excess of motorization pressure (Pm) acting on both

the main diaphragm and Type PRX pilot bleeds to the

downstream system through a bleed restriction in the pilot.

For Type EZH DN 100 a check valve (Figure 26) is installed

between outlet pressure and motorization pressure impulse

lines; this valve will protect the diaphragm assembly from

wrong procedures during startup, avoiding a too high pressure

differential between outlet and motorization pressure.

RP IP

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 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 9

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