Emerson EZH and EZHSO Series Pressure Reducing Regulators Manuál s instrukcemi stáhnout pdf (Strana 5)

EZH and EZHSO Series

Pilot Supply Filter Regulator

The Type SA/2 pilot supply lter regulator provides a

constant supply pressure to the PRX Series pilot that

is approximately 45 psi / 3.1 bar over set pressure.

The Type SA/2 has an integral 5-micron lter.

Principle of Operation

EZH Series – Spring-to-Close Version

EZH Series Single-Pilot Regulator

CAUTION

The pilot-operated EZH Series

(Spring-to-Close version) will fail

in close position with a main valve

diaphragm failure or lack of pressure

supply to the pilot (see Table 3 for

Failure Mode Analysis).

EZH Series (Figure 3) uses inlet pressure as the

operating medium, which is reduced through pilot

operation to load the regulator actuator diaphragm.

Outlet or downstream pressure opposes loading

pressure in the actuator and also opposes the pilot

control spring.

Pilot is supplied with pressure coming from

pre-regulator Type SA/2, which reduces inlet

pressure to the constant value of outlet pressure plus

approximately 45 psi / 3.1 bar.

When outlet pressure drops below the setting of the

pilot control spring, pilot control spring force on the

pilot diaphragm opens the pilot valve disk, providing

additional loading pressure to the regulator actuator

diaphragm. This diaphragm loading pressure opens

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

downstream system. Any excess loading pressure on

the actuator diaphragm escapes downstream through

the bleed restriction in the pilot.

When the gas demand in the downstream system

has been satised, the outlet pressure 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 PRX Series diaphragm, closing

the PRX Series orice and interrupting the loading

pressure supply to main valve actuator. The excess of

loading pressure acting on both the main diaphragm

and PRX Series pilot bleeds to the downstream

system through a bleed restriction in the pilot.

A check valve is installed between outlet pressure and

loading pressure impulse lines; this valve will protect

the diaphragm assembly from possible damage during

startup, limiting the differential between outlet and

loading pressure.

EZHSO Series – Spring-to-Open Version

EZHSO Series Single-Pilot Regulator

CAUTION

The pilot-operated EZHSO Series

(Spring-to-Open version) will fail

in open position with a main valve

diaphragm failure or lack of pressure

supply to the pilot (see Table 3 for

Failure Mode Analysis).

EZHSO Series (Figure 4) uses inlet pressure as the

operating medium, which is reduced through pilot

operation to load the regulator actuator diaphragm

(lower chamber). The upper case of EZHSO Series

actuator lled with pressure coming from pre-regulator

Type SA/2, which reduces inlet pressure to the

constant value of outlet pressure plus approximately

45 psi / 3.1 bar. This pressure opposes the main

spring force that tends to open the regulator. Outlet or

downstream pressure opposes the pilot control spring.

When outlet pressure drops below the setting of the

pilot control spring, pilot control spring force on the

pilot diaphragm opens the pilot valve disk, providing

additional loading pressure to the regulator actuator

diaphragm. This diaphragm loading pressure opens

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

downstream system. Any excess loading pressure

on the regulator actuator diaphragm and PRX Series

escapes downstream through the bleed restriction in

the pilot.

When outlet pressure increases over the setting of

the pilot spring, the pilot valve disk will be closed

reducing loading pressure to the actuator diaphragm;

the pressure in the upper case will force the regulator

to close.

A check valve is installed between inlet pressure to

upper actuator casing and loading pressure impulse

lines; this valve will protect the diaphragm assembly

from possible damage during startup, limiting the

differential between inlet and loading pressure.

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