Table 1.
Main Valve Body Sizes, End Connection Styles and Structural Design Ratings
Note
It is important that the backpressure
regulator be installed so that the vent
hole in the spring case is unobstructed
at all times. For outdoor installations,
the backpressure regulator should be
located away from vehicular traffic and
positioned so that water, ice and other
foreign materials cannot enter the spring
case through the vent. Avoid placing the
backpressure regulator beneath eaves
or downspouts, and be sure it is above
the probable snow level.
CAUTION
When installing Type EZR trim in an
existing Fisher™ E-body, damage
can result if flow is not in the correct
direction. Look at the body web to
confirm that flow is in the correct
direction—up through the center of
the cage and down through the cage
slots. Change the existing flow arrow
if necessary.
Overpressure Protection
Maximum inlet pressures depend upon body materials
and temperatures. Refer to the nameplate for the
maximum inlet pressure of the valve. The valve should
be inspected for damage after any overpressure
condition.
Fisher backpressure regulators are NOT
ASME safety relief valves.
Startup
The backpressure regulator is factory set at
approximately the midpoint of the spring range or
the pressure requested, so an initial adjustment may
be required to give the desired results. With proper
installation completed and relief valves properly
adjusted, slowly open the upstream and downstream
shutoff valves (if applicable).
MAIN VALVE BODY SIZE
MAIN VALVE BODY MATERIAL
END CONNECTION STYLE
STRUCTURAL DESIGN RATING
DN
NPS
bar
psig
50, 80, 100
and 150
2, 3, 4 and 6
Cast Iron
NPT (NPS 2 / DN 50 only)
27.6
400
CL125 FF
13.8
200
CL250 FF
34.5
500
25, 50, 80, 100
and 150
1, 2, 3, 4 and 6
WCC Steel
NPT or SWE (NPS 1 and 2 / DN 25 and 50 only)
102
1480
CL150 RF
19.7
285
CL300 RF
51.0
740
CL600 RF or BWE
102
1480
200
8
LCC Steel
CL150 RF
19.7
285
CL300 RF
51.0
740
CL600 RF
102
1480
PILOT TYPE
RELIEF SET PRESSURE RANGE
PILOT CONTROL INFORMATION
Maximum Operating Pressure
Maximum Emergency Pressure
bar
psig
bar
psig
bar
psig
6358 and 6358B
1.4 to 2.8
2.4 to 8.6
20 to 40
35 to 125
10.3
150
10.3
150
6358EB
5.2 to 9.7
9.0 to 13.8
12.4 to 24.1
75 to 140
130 to 200
180 to 350
44.8
650
51.7
750
6358EBH
17.3 to 31.0
27.6 to 41.4
(2)
250 to 450
400 to 600
PRX/182
2 to 8
5 to 20
15 to 42
29 to 116
73 to 290
217 to 609
12.0
609
102
1480
PRX/182-AP
30 to 80
435 to 1160
80.0
1160
102
1480
1. See the Main Valve Body Sizes, End Connections, Structural Design Ratings tables and the Main Valve Diaphragm and Spring Pressure Ratings table for additional pressure ratings.
2. Fluorocarbon (FKM) diaphragms are limited to 31.0 bar / 450 psig.
Table 2.
Set Pressure Ranges, Pilot Pressure Ratings and Pilot Information
(1)
Type EZR Relief
2
