Specifications; Principle Of Operation; Main Valve Body Sizes, End Connection Styles, And Body Ratings - Fisher EZR Instruction Manual

Type EZR

Specifications

Main Valve Body Sizes, End Connection Styles,
and Structural Design Ratings
See Table 1
Maximum Inlet Pressures and Pressure Drops
Main Valve: See Table 10
Pilots: See Table 3
Restrictor: 1500 psig (103 bar)
Outlet (Control) Pressure Ranges
See Table 2
Main Valve Plug Travel
NPS 1, 1-1/4 x 1, 2 x 1
(DN 25, 32 x 25, 50 x 25): 0.37-inch (9,4 mm)
NPS 2 (DN 50): 0.68-inch (17 mm)
NPS 3 (DN 80): 0.98-inch (25 mm)
NPS 4 (DN 100): 1.19-inch (30 mm)
NPS 6 (DN 150): 1.5-inch (38 mm)
NPS 8 (DN 200): 1.75-inch (44 mm)
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
2. End connections for other than ASME standard can usually be provided, contact your local Sales Office for assistance.
MAIN VALVE BODY SIZE, NPS (DN)
2 x 1, 2, 3, 4, and 6
(50 x 25, 50, 80, 100, and 150)
1, 1-1/4 x 1 , 2 x 1, 2, 3, 4,
(3)
6 x 4 , 8 x 4 , 6, 8 x 6 , and 12 x 6
(4) (4) (4)
(25, 32 x 25, 50 x 25, 50, 80,
100,150 x 100, 200 x 100, 150,
200 x 150, and 300 x 150)
8 (200)
1. Ratings and end connections for other than ASME standard can usually be provided. Contact your local Sales Office for assistance.
2. See Tables 3, 8, 10, and 11 for diaphragm materials and additional pressure ratings.
3. Available in steel NPT only.
4. NPS 6 x 4, 8 x 4, 8 x 6, 12 x 6 (DN 150 x 100, 200 x 100, 200 x 150, 300 x 150) Types EZR and 399 bodies are not the same as the EW valve bodies and are not interchangeable.
Specifications
Specifications for the Type EZR regulator are shown
above. The control spring range for the pilot is marked
on the spring case of 161EB Series pilots and on the
nameplate of 161AY and PRX Series pilots. Other
information for the main valve appears on the nameplate.

Principle of Operation

As long as the outlet (control) pressure is above the
outlet pressure setting, the pilot valve plug or disk
remains closed (Figure 2). Force from the main
spring, in addition to inlet pressure bleeding through
2
(1)(2)
Table 1. Main Valve Body Sizes, End Connection Styles, and Body Ratings
MAIN VALVE BODY MATERIAL
Cast iron
(4)
WCC Steel
LCC Steel
Minimum and Maximum Differential Pressures
See Tables 4 and 10
Proportional Bands
See Table 2
(1)
Temperature Capabilities
See Table 8
Pressure Registration
External
Options
• Integral Slam-Shut Device
• Pre-piped Pilot Supply and Pilot Bleed
• Travel Indicator
• Inlet Strainer
• Type 252 Pilot Supply Filter
• Trim Package
• Restricted Capacity Trim
• Pilot Diaphragm for Pressure Loading
• Quick Disconnect Union in Pilot Mounting
END CONNECTION STYLES
NPT (NPS 2 x 1 and 2
(DN 50 x 25 and 50) only)
CL125 FF
CL250 RF
NPT or SWE (NPS 1, 2 x 1, and 2
(DN 25, 50 x 25, and 50) only)
CL150 RF
CL300 RF
CL600 RF or BWE
CL150 RF
CL300 RF
CL600 RF
the Type 112 restrictor (the restrictor is integral in the
PRX Series pilots), provides downward loading
pressure to keep the main valve diaphragm and plug
assembly tightly shutoff.
When the outlet pressure decreases below the pilot
outlet pressure setting, the pilot plug or disk assembly
opens. Loading pressure bleeds downstream through
the pilot faster than it can be replaced through the
Type 112 restrictor. This reduces loading pressure
on top of the main valve diaphragm and plug
assembly. The force imbalance on the diaphragm
allows the inlet pressure to overcome the loading
pressure and main spring force and open the
Type EZR diaphragm and plug assembly.
(1)
STRUCTURAL DESIGN
(1)
RATInG
(2)
400 psig (27,6 bar)
200 psig (13,8 bar)
500 psig (34,5 bar)
1500 psig (103 bar)
290 psig (20,0 bar)
750 psig (51,7 bar)
1500 psig (103 bar)
290 psig (20,0 bar)
750 psig (51,7 bar)
1500 psig (103 bar)
(1)