Emerson EZL Series Pressure Reducing Regulator for Low Pressure Applications Instrukcja Obsługi Pobierz pdf (Strona 5)

Type EZL

Type EZL Upstream or Downstream Wide-Open Monitor

E0948

January 2008

Type EZL

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

LOADING PRESSURE

INTERMEDIATE PRESSURE

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

INTERMEDIATE PRESSURE

LOADING PRESSURE

Working Monitoring Regulators (Figure 5)

In a working monitoring system, the upstream regulator

requires two pilots and it is always the monitoring

regulator. The additional pilot permits the monitoring

regulator to act as a series regulator to control an

intermediate pressure during normal operation. In this

way, both units are always operating and can be easily

checked for proper operation.

In normal operation, the working regulator controls

the outlet pressure of the system. The monitoring

regulator’s working pilot controls the intermediate

pressure and the monitoring pilot senses the system’s

outlet pressure. If the working regulator fails, the

monitoring pilot will sense the increase in outlet

pressure and take control.

Note

The working regulator must be rated

for the maximum allowable operating

pressure of the system because this will

be its inlet pressure if the monitoring

regulator fails. Also, the outlet pressure

rating of the monitoring pilot and any

other components that are exposed to

the intermediate pressure must be rated

for full inlet pressure.

Working monitor installations require a Type EZL

main valve with a working pilot and a monitoring pilot

for the upstream regulator and a Type EZL with the

appropriate pilot for the downstream regulator.

Adjustment

Adjusting the monitor regulator is similar to adjusting

the main regulator. Monitor setpoints are set slightly

higher than the main regulator. However, the value

of this difference cannot be determined in advance,

as it depends on the particular characteristics of

each application.

Figure 4. Wide-Open Monitoring System Operational Schematic

E0948

TYPE EZL MAIN VALVE TYPE EZL MAIN VALVE

TYPE 67C PILOT

SUPPLY REGULATOR

P590 SERIES

PILOT SUPPLY

FILTER

TYPE 6352 PILOT

P590 SERIES PILOT

SUPPLY FILTER

INLET PRESSURE

OUTLET PRESSURE

LOADING PRESSURE

INTERMEDIATE PRESSURE

ATMOSPHERIC PRESSURE

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