Emerson EZR Series Pressure Reducing Regulator Manual de instrucciones descargar pdf (Pagina 6)

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Type EZR

PRINCIPLE OF OPERATION

B18A

Figure 7. Type EZR E Body with PRX Pilot

Regulator

The EZR is a pilot-driven, diaphragm/plug regulator.

Tight shutoff is achieved by the diaphragm/plug pushing

against the slotted cage, the force of the closing spring and

the inlet pressure.

Opening•

As the ow increases, the outlet pressure Pd decreases

on the outlet side of the regulator and on the pilot diaphragm.

Due to the force of the spring, the pilot opens.

The pilot ow increases, the pressure loss through the

pilot restrictor increases.

The modulated pressure Pm decreases.

The force of the closing spring and that of the

Pm becomes inferior to that provoked by the Pu,

the regulator OPENS.

Closing•

As the ow decreases, the Pd increases outlet side

of the regulator.

The force of the pilot diaphragm is overcome by the force

of the spring, the pilot closes.

The pressure loss through the pilot restrictor decreases.

The force of the closing spring and that of the Pm

becomes superior to that provoked by the Pu, the

regulator CLOSES.

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Emerson EZR Series Pressure Reducing Regulator Manual de instrucciones Pagina 6