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Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de instrucciones Pagina 3

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Type EZH Relief or Backpressure Regulator
3
Table 1. Main Valve Body Sizes, End Connection Styles, and Body Ratings
MAIN VALVE BODY SIZE
MAIN VALVE BODY MATERIAL END CONNECTION STYLE
STRUCTURAL DESIGN RATING
NPS DN psig bar
1 25
WCC Steel
NPT or SWE 1500 103
CL150 RF 290 20.0
CL300 RF 750 51.7
CL600 RF or BWE 1500 103
2 50
NPT or SWE 1500 103
CL150 RF 290 20.0
CL300 RF 750 51.7
CL600 RF or BWE 1500 103
3 80
CL150 RF 290 20.0
CL300 RF 750 51.7
CL600 RF or BWE 1500 103
4 100
CL150 RF 290 20.0
CL300 RF 750 51.7
CL600 RF or BWE 1500 103
Principle of Operation
A pressure relief valve is a throttling pressure control device
that opens and closes to ensure the inlet pressure does not
rise above a predetermined pressure. Fisher
®
relief valves
cannot be used as ASME safety relief valves. A backpressure
regulator is a device that controls and responds to changes in
the upstream pressure. It functions the same as a relief valve
in that it opens on increasing upstream pressure.
Relief Valve
As long as the inlet pressure is below the set pressure, the pilot
control spring keeps the pilot valve plug closed. Inlet pressure
passes through the restrictor and registers as loading pressure
on the main valve diaphragm chamber. Force from the main
spring, in addition to pilot loading pressure, provide loading
pressure to keep the main valve diaphragm and plug assembly
tightly shut off. When the inlet pressure rises above the set
pressure, the pressure on the pilot diaphragm overcomes
the pilot control spring and opens the pilot valve plug. The
pilot then exhausts the loading pressure from the main valve
diaphragm chamber. The pilot continuously exhausts gas when
the inlet pressure is above the set pressure. The inlet pressure
unbalance overcomes the main spring force and opens the
diaphragm and plug assembly.
As the inlet pressure drops below the set pressure, the pilot
control spring closes the pilot valve plug and the exhaust to
atmosphere stops. Force from the main spring, along with pilot
loading pressure, pushes the diaphragm and plug assembly
onto the knife-edged seat, producing tight shutoff.
Backpressure Regulator
As long as inlet pressure remains below setpoint, the
pilot control spring keeps the pilot valve plug closed. Inlet
pressure passes through the upper port around the upper
portion of the valve plug and then through the hollow passage
in that valve plug. Force from the main spring, in addition to
pilot loading pressure, provide downward loading pressure to
keep the main valve diaphragm and plug assembly tightly shut
off. When inlet pressure rises above the set pressure, pressure
on the pilot diaphragm overcomes the control spring to close
the upper port and stroke the valve plug to open the lower
port. The pilot exhausts loading pressure from the main valve
diaphragm chamber. Inlet pressure unbalance overcomes the
main spring force to open the diaphragm and plug assembly.
While the main valve is throttling, the upper port of the pilot
stays closed. The pilot exhausts only when it repositions the
main valve. As inlet pressure drops below setpoint, the pilot
control spring overcomes the diaphragm force to stroke the
valve plug down to close the lower port and open the upper
port. Force from the main spring, along with pilot loading
pressure, pushes the diaphragm and plug assembly onto the
knife-edged seat, producing tight shutoff.
PILOT
TYPE
RELIEF SET
PRESSURE RANGE
PILOT CONTROL INFORMATION
Part Number Color
Wire Diameter Free Length
Maximum
Operating
Pressure
Maximum
Emergency
Pressure
psig bar Inch mm Inch mm psig bar psig bar
PRX/182
29 to 116
73 to 290
217 to 609
2.0 to 8.0
5.0 to 20.0
15.0 to 42.0
GD25522X012
GD25520X012
GD25519X012
Black
Gold
Red
0.157
0.197
0.236
3.99
5.00
5.99
2.16
2.01
2.01
55
51
51
609 42.0 1480 102
PRX-AP/182 435 to 1160 30.0 to 80.0 GD27379X012 Clear 0.335 8.51 3.94 100 1160 80.0 1480 102
Table 2. Relief Set Pressure Ranges
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