Emerson EZH and EZHSO Series Pressure Reducing Regulators Arkusz Danych Pobierz pdf (Strona 9)

Bulletin 71.2:EZH and EZHSO

Figure 5. Working Monitoring System Operational Schematic

ATMOSPHERIC PRESSURE

E0876

INLET PRESSURE

LOADING PRESSURE

INTERMEDIATE PRESSURE

PILOT SUPPLY PRESSURE

OUTLET PRESSURE

TYPE PRX:

S - BLEED PORT

B - SUPPLY PORT

L - LOADING PORT

A - SENSING PORT

TYPE SA/2:

V - SENSING PORT

R - PILOT SUPPLY PORT

M - INLET PORT

TYPE EZH

WORKER REGULATOR

TYPE EZH

MONITOR REGULATOR

TYPE PRX-120

TYPE PRX-125

TYPE PRX-120

TYPE SA/2

CHECK

VALVE

CHECK VALVE

TYPE SA/2

Overpressure Protection

Overpressuring any portion of a regulator or

associated equipment may cause personal injury,

leakage or property damage due to bursting of

pressure-containing parts or explosion of accumulated

gas. Provide appropriate pressure relieving or

pressure limiting devices to ensure that the limits in

the Specications section are not exceeded. Regulator

operation within ratings does not prevent the possibility

of damage from external sources or from debris in the

pipeline. Common methods of external overpressure

protection include relief valves, monitoring regulators,

shutoff devices and series regulation.

Types EZHOSX (Figure 6) and EZHSO-OSX

regulators rely on the integrated slam-shut device

for overpressure (OPSO) or overpressure and

underpressure (OPSO/UPSO) protection. In the event

that outlet pressure rises above or falls below the

pressure setting, slam shut will completely shut off the

ow of gas to the downstream system.

Installation

The EZH and EZHSO Series may be installed in any

position, but it is normally installed in a horizontal

pipeline with the pilot or pilots above the body. The

optimal location for the sense and bleed lines is

between the regulator and the downstream block

valve. If the sense and bleed lines cannot be located

between the EZH and EZHSO Series and downstream

block valve, contact your local Sales Ofce for startup

assistance. See Figures 2 and 3 for typical

piping installations.

Note

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.

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Emerson EZH and EZHSO Series Pressure Reducing Regulators Arkusz Danych Strona 9

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