Emerson EZH and EZHSO Series Pressure Reducing Regulators Manuál s instrukcemi stáhnout pdf (Strana 8)

Standard Pilots

The regulator opens with a decrease (unloading) of the

modulated pressure (Pm).

Opening

The ﬂ ow demand increases, the decrease in the outlet

pressure (Pd) is registered by the pilot-sensing element.

Forced by the action of the control springs, the pilot, then the

pre-expansion relay, open.

The pilot ﬂ ow increases and becomes superior to that of the

restriction tap (key 27).

The modulated pressure (Pm) bleeds to the oulet side

through the reject pilot (RP).

The regulator OPENS.

Figure 7. Type EZR Regulator with Type Compact PIlot System

Closing

The ﬂ ow demand decreases, the increase in the outlet

pressure (Pd) is registered by the pilot-sensing element.

The force applied on the pilot impulse is overcome by that

of the control spring, the pilot, then the pre-expansion relay

close.

The pilot ﬂ ow decreases and becomes inferior to that of the

restriction tap (key 27).

The modulated pressure (Pm) increases.

The regulator CLOSES.

Boot Trim Pilot Systems

Principle of operation based on Compact Pilot System

RP IP

Pup

Pu : Inlet pressure

Pd : Outlet pressure

Pm : Modulated pressure

RP : Pilot Reject

IP : Pilot Impulse

IS : Slam-Shut Impulse

A94

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Emerson EZH and EZHSO Series Pressure Reducing Regulators Manuál s instrukcemi Strana 8