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Type EZL
Specifications
The Specifications section lists the specifications for Type EZL relief valve or backpressure regulator. Factory specifications
for specific relief valve or backpressure regulator constructions are stamped on the nameplate fastened to either the main
actuator or the pilot spring case.
Body Sizes, End Connection Styles and
Pressure Ratings
(1)
See Table 1
Maximum Pressures
(1)
Inlet and Outlet (Design): 290 psig / 20 bar
Emergency (Design Casing): 290 psig / 20 bar
Operating Differential: 290 psid / 20 bar d
Relief Set Pressure Ranges
See Table 2
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
MAIN VALVE BODY SIZE
2, 3 and 4 in. /
DN 50, 80 and 100
1. Structural design rating is the rating for the main valve body. The Type EZL complete assembly is limited to 290 psig / 20 bar.
2. Available only on 2 in. / DN 50 body.
RELIEF SET PRESSURE
RANGE
PILOT TYPE
psig
3 to 18
6358B
15 to 40
35 to 125
85 to 140
6358EB
130 to 200
180 to 350
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
Table 1. Main Valve Body Sizes, End Connection Styles and Body Ratings
MAIN VALVE BODY MATERIAL
WCC Steel
Cast iron
Table 2. Relief Set Pressure Ranges
SPRING PART
(1)
NUMBER
bar
0.21 to 1.2
1B986027212
1.0 to 2.8
1E392527022
2.4 to 8.6
1K748527202
5.9 to 9.6
17B1261X012
9.0 to 13.8
17B1263X012
12.4 to 24.1
17B1264X012
Minimum Differential Pressure
TRIM, PERCENT
OF CAPACITY
100
2.9 psid / 0.204 bar d
Temperature Capabilities
Nitrile (NBR) Version: -20 to 180°F / -29 to 82°C
Fluorocarbon (FKM) Version: 0 to 180°F / -18 to 82°C
Options
• Travel Indicator
END CONNECTION STYLE
NPT
or SWE
(2)
(2)
CL150 RF
CL300 RF
CL600 RF or BWE
NPT
(2)
CL125 FF
SPRING WIRE DIAMETER
SPRING
COLOR
In.
Green
0.120
Yellow
0.148
Red
0.187
Green
0.225
Blue
0.262
Red
0.294
(1)
MINIMUM DIFFERENTIAL
FOR FULL STROKE
2 In. /
3 and 4 In. /
DN 50
DN 80 and 100
2.9 psid / 0.204 bar d
(1)
STRUCTURAL DESIGN RATING
psig
1500
290
750
1500
400
200
SPRING FREE LENGTH
mm
In.
3.05
2.12
3.76
2.00
4.75
2.19
5.72
3.70
6.65
3.85
7.47
4.22
(1)
bar
103
20.0
51.7
103
27.6
13.8
mm
53.8
50.8
55.6
94.0
97.8
107
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