2
Introduction
Scope of the Manual
This manual provides installation, startup, maintenance
and parts ordering information for the Types EZH and
EZHSO pressure-reducing regulators and Type PRX pilot
with Type SA/2 pilot supply lter regulator.
Information on other equipment used with this regulator is
found in separate manuals.
Product Description
Types EZH and EZHSO regulators are accurate pilot-
operated pressure balanced, soft-seated regulators.
They are designed for use in high pressure natural
gas transmission/city gate stations, large capacity
distribution systems and power plant feeds. They
provide smooth, reliable operation, tight shutoff and
long life.
Type EZHSO "Spring-to-Open" version could be
used when other overpressure protection options are
foreseen, for example in a monitor conguration. In
this case, in event of failure, the main regulator will
stay completely open, allowing the monitor to take
control. The monitor could be "Spring-to-Close" to
ensure a double protection to downstream pipe.
Types EZH and EZHSO ("E Body")
Single regulator without slam shut
Types EZH and EZHSO ("X Body")
Single regulator in an X Body
In case of modication made on a pressure
equipment like cap replacement by a slam shut it is
mandatory to comply to the local codes, rules and
regulations. Contact us imperatively.
Types EZH OS2 and EZHSO OS2 ("X Body")
Single regulator with integrated slam shut
Pilot Description
Type PRX Pilot
The Types EZH and EZHSO pressure-reducing
regulators can be equipped with a PRX Series pilot
mounted on the main valve for pressure reducing or wide-
open monitoring applications. The PRX Series pressure
reducing pilots have the ability to handle a wide range of
setpoints from 1 to 80 bar:
Outlet pressure range of 1 to 40 bar. The
Type PRX/120 can be used as the pilot on single stage
pressure reducing regulators, as the monitor pilot or as
the working pilot in wide-open monitor systems.
Outlet pressure range of 30 to 80 bar. The
Type PRX/120-AP can be used as the pilot on single
stage pressure reducing regulators, as the monitor pilot
or as the working pilot in wide-open monitor systems.
Identical to the Type PRX/120, except the restriction
screw is removed. The Type PRX/125 can only
be used as the monitor override pilot on working
monitor applications.
Identical to the Type PRX/120-AP, except the restriction
screw is removed. The Type PRX/125-AP can only
be used as the monitor override pilot on working
monitor applications.
The Type SA/2 pilot supply lter regulator provides a
constant pressure supply to the PRX Series pilot of
3 bar over the set pressure. The Type SA/2 has an
integral 5-micron lter. For easy maintenance a block
valve can be installed to separate the regulator from
the pilot.
Regulator Options
Silencer (Figure 22)
The Type EZH silencer (Whisper III) is integrated in
the regulator and is composed of a drilled cage. The
Whisper III silencer is available for DN 25, 50, 80
and 100 and allows a noise attenuation up to 8dB.
The ow reduction is realised by replacement of the
regulator standard seat by a reduction seat (key 2).
Type RPE Electrical Pilot Heater (Figure 25)
The Type RPE is used for reheating the gas
supplying pressure reducing regulator pilots.
The Type RPE avoids the inconveniences
caused by freezing which can occur during high
pressure drops.
Actuator
The actuator is an integral pressure type. All pressure
parts are designed to resist up to 100 bar. The
diaphragm is strong and can resist to a differential of
100 bar.
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