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Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de instrucciones Pagina 8

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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
IS
Pu
Pm
RP IP
Pd
15
16
14
20
21
13
12
11
10
27
22
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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