EZH and EZHSO Series
6
EZH and EZHSO Series Adjustment
The adjustment of the regulators (Figures 3 and 4),
is performed by means of the pilot adjusting screw,
which varies the compression of the control spring.
Adjustment is performed while the regulator is in
operation with the aid of a pressure gauge to monitor
downstream pressure.
Note
The shut-off valve downstream of the
regulator must not be completely closed,
as it is necessary that a small quantity
of gas ows downstream to allow the
outlet side to vent, when it is necessary
to lower the pressure.
Loosen the PRX Series pilot locknut and turn the
adjusting screw slowly clockwise to increase outlet
pressure and counterclockwise to decrease outlet
pressure. Use a pressure gauge to monitor the outlet
pressure until the desired pressure is reached. No
adjustment is needed to the Type SA/2 pre-regulator.
Figure 4. EZHSO Series (Spring-to-Open Version) Operational Schematics
TYPE PRX:
S - BLEED PORT
B - SUPPLY PORT
L - LOADING PORT
A - SENSING PORT
TYPE SA/2:
V - SENSING PORT
R - PILOT SUPPLY PORT
M - INLET PORT
M1011
Monitoring Systems
Monitoring regulation is overpressure protection by
containment; therefore, there is no relief valve to vent
to the atmosphere. When the working regulator fails
to control the pressure, a monitor regulator installed
in series, which has been sensing the downstream
and control pressure, goes into operation to maintain
the downstream pressure at a slightly higher than
normal set pressure. During an overpressure situation,
monitoring keeps the customer on line. Also, testing
is relatively easy. To perform a periodic test on a
monitoring regulator, increase the outlet set pressure
of the working regulator and watch the outlet pressure
gauge to determine if the monitoring regulator takes
over at the appropriate outlet pressure.
Wide-Open Monitoring System (Figure 5)
There are two types of wide-open monitoring systems:
upstream and downstream. The difference between
upstream and downstream monitoring is that the
functions of the regulators are reversed. Systems can
be changed from upstream to downstream monitoring
and vice-versa, by simply reversing the setpoints
EZHSO SERIES
TYPE
PRX/120
TYPE
SA/2
M
V
R
L
S
B
A
PILOT BLEED
RESTRICTION
CHECK VALVE
PILOT LOWER
DIAPHRAGM
PILOT DISK
FILTER
REGULATOR ACTUATOR
DIAPHRAGM
MAIN VALVE
DISK (PLUG)
INLET PRESSURE
LOADING PRESSURE
PILOT SUPPLY PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
(24 Seiten)
(170 Seiten)
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