Emerson EZL Series Pressure Reducing Regulator for Low Pressure Applications Instrukcja Obsługi Pobierz pdf (Strona 3)

Type EZL

Type EZL with 6350 Series Pilot and

Type P590 Pilot Supply Filter

E0944

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

January 2008

Type EZL

LOADING PRESSURE

Principle of Operation

Single-Pilot Regulator

The pilot-operated Type EZL (Figure 2 or 3) uses inlet

pressure as the operating medium, which is reduced

through pilot operation to load the actuator diaphragm.

Outlet or downstream pressure opposes loading

pressure in the actuator and also 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 thus opens the pilot valve plug,

providing additional loading pressure to the actuator

diaphragm. This diaphragm loading pressure opens

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

downstream system. Any excess loading pressure on

E0944

Figure 2. Type EZL with Type 6352 Pilot and Type P590 Pilot Supply Filter Operational Schematic

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 diaphragm, closing the orice.

The loading pressure acting on the main diaphragm

bleeds to the downstream system through a bleed

restriction in the pilot.

Adjustment

The adjustment of the regulator is performed by

means of the pilot adjusting screw, which varies

the compression of the control spring. Adjustment

INLET PRESSURE

OUTLET PRESSURE

LOADING PRESSURE

ATMOSPHERIC PRESSURE

P590 SERIES PILOT

SUPPLY FILTER

“D” PORT

SENSE

PRESSURE

TYPE EZL MAIN VALVE

“A” PORT

INLET PRESSURE

“C” PORT

LOADING PRESSURE

TYPE 6352 PILOT

1 2 3 4 5 6 7 8 ... 23 24

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