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Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de instrucciones Pagina 4

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Standard Pilots
PRINCIPLE OF OPERATION
Hard Trim Pilot Systems
Principle of Operation based on Compact Pilot System
Figure 4. Principle of Operation with Compact Pilot System - Type K1000/K3000 and EZR Regulators
The regulator opens due to the increase (loading) of the
modulated pressure (Pm).
Opening
The fl ow demand increases, the decrease in 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 pre-expansion pressure (Pup) feeds the pilot.
The modulated pressure (Pm) is fed to the pilot through the
actuator diaphragm.
The regulator OPENS.
A93
Closing
The fl ow demand decreases, the increase of the outlet pres-
sure (Pd) is registered by the pilot-sensing element.
The increased outlet pressure overcomes the force of the
control spring, the pilot, then the pre-expansion relay, close.
The modulated pressure (Pm) bleeds through the reject
pilot (RP).
The regulator CLOSES.
Pd
Short IP
Long IP
RP
Pm
Pm
Pilot feed
Atm
13
12
21
11
20
10
14
15
16
26
2223
IS
Pu
Pu: Inlet pressure
Pd: Outlet pressure
Pm: Modulated pressure
RP: Pilot Reject
IP: Pilot Impulse
IS: Slam-Shut Impulse
Europe, Middle East, and Africa Only
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