Emerson EZH and EZHSO Series Pressure Reducing Regulators Instrukcja Obsługi Pobierz pdf (Strona 11)

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Types EZH and EZHSO

Figure 12. Type EZHSO DN 100 (Spring-to-Open Version) Operational Schematic

Inlet pressure (Pu)

Outlet pressure (Pd)

Motorization pressure (Pm)

Pilot feeding pressure (Pup)

Atmospheric pressure (Pb)

RP IP

MONITORING SYSTEMS

Monitoring regulation is overpressure protection by

containment, therefore, there is no relief valve to vent to the

atmosphere. When the working regulator fails to control

the pressure, a monitor regulator installed in series, which

has been sensing the downstream and control pressure,

goes into operation to maintain the downstream pressure

at a slightly higher level than normal pressure. During an

overpressure situation, the monitoring system keeps the

customer on line.

Also testing is relatively easy and safe. To perform a

periodic test on a monitoring regulator, increase the outlet

set pressure of the working regulator and watch the outlet

pressure to determine if the monitoring regulator takes over

at the appropriate outlet pressure.

Wide-Open Monitoring Systems

In normal operation of a wide-open conguration, the

working regulator controls the system’s outlet pressure.

With a higher outlet pressure setting, the monitor regulator

senses a pressure lower than its setpoint and tries to

increase outlet pressure by going wide open. If the working

regulator fails, the monitoring regulator assumes control and

holds the outlet pressure at its outlet pressure setting.

Figure 13 shows an upstream wide-open monitor Type EZH

(Spring-to-Close) and a downstream active regulator

Type EZHSO (Spring-to-Open). With this conguration,

in case of regulator main diaphragm failure, it will fail in

open position letting the monitor work properly; in case

of monitor main diaphragm failure, it will fail in close

position guaranteeing a protection against overpressure to

downstream system.

TYPE PRX:

S - BLEED PORT TYPE SA/2

B - SUPPLY PORT V - SENSING

L - MOTORIZATION PORT R - PILOT

A - SENSING PORT M - INLET

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 35 36

Types EZH and EZHSO 1
LABELLING 5

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Emerson EZH and EZHSO Series Pressure Reducing Regulators Instrukcja Obsługi Strona 11

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