Emerson EZH and EZHSO Series Pressure Reducing Regulators Instrukcja Obsługi Pobierz pdf (Strona 6)

Standard Pilots

Figure 6a. Type EZHFO Regulator with Type BSL 85 Pilot System

Hard Trim Pilot Systems (continued)

Principle of operation based on BSL 85 Pilot System

“Fail to Open” Version

RM2

RP2

PR2

Pu: Inlet pressure

Pd: Outlet pressure

Pm: Modulated pressure

RP: Pilot Reject

IP: Pilot Impulse

IS: Slam-Shut Impulse

ID: Differential Impulse

R2: Pilot Feed tap

F2: Filter

RM2: Motorized Pressure tap

RP2: Pilot Reject tap

PR2: Pre-expansion Relay

PA: Active Pilot

In this case, it is still possible to choose two types of regula-

tors depending on their reaction in the case of failure mode.

Figure 6a: the regulator spring tries to close, the “Fail to

Open” mode is managed by the appropriate pilot.

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Emerson EZH and EZHSO Series Pressure Reducing Regulators Instrukcja Obsługi Strona 6