Bulletin 74.2:Y696
2
Specications
Body Size and End Connection Style
(1)
See Table 1
Maximum Allowable Inlet and Outlet Pressure
(2)
15 psig (1,0 bar)
Orice Diameter
1-inch (25 mm)
Control Pressure Ranges
See Table 2
Flow Capacities
See Table 7
Wide-Open Flow Coefcients
C
V
: 14.7
C
g
: 515
C
1
: 35
Pressure Registration
Internal
Vent Connections
1/4 NPT
Spring Case Connection
1/4 NPT
Common Services and Material Compatibility
See Tables 3 and 4
Temperature Capabilities
(2)
Nitrile (NBR): -20° to 180°F (-29° to 82°C)
Fluorocarbon (FKM): 40° to 300°F (4° to 149°C)
Peruoroelastomer (FFKM): 0° to 300°F (-18ۜ° to 149°C)
Ethylenepropylene (EPDM): -20° to 275°F (-29° to 135°C)
Approximate Weight
Cast iron: 45 pounds (20 kg)
Steel and Stainless Steel: 57 pounds (26 kg)
Construction Materials
Body and Union Nut: Cast iron, Steel,
CF8M Stainless steel, or Hastelloy
®
C
Spring Case: Cast iron, Steel, or CF8M Stainless steel
Diaphragm Case Assembly: Cast iron, Steel,
CF8M Stainless steel, or Hastelloy
®
C
Control Spring, Control Spring Seat, and
Diaphragm Plate: Plated Steel
Diaphragm: Nitrile (NBR) (standard),
Fluorocarbon (FKM), or Ethylenepropylene (EPDM)
Disk Assembly: 303 Stainless steel disk holder
with Nitrile (NBR) or Ethylenepropylene (EDPM) disk;
316 Stainless steel disk holder with Nitrile (NBR),
Fluorocarbon (FKM), Peruoroelastormer (FFKM), or
Polytetrauoroethylene (PTFE) disk; or Hastelloy
®
C
disk holder with PTFE disk
Orice, Pusher Post, Lever Assembly, Stem,
and Cotter Pin: 303 Stainless steel,
316 Stainless steel, or Hastelloy
®
C
Gaskets: Composition
1. End connections for other than U.S. standard can usually be provided, consult your local Sales Ofce.
2. The pressure/temperature limits in this Bulletin or any applicable standard limitation should not be exceeded.
Table 1. Body Sizes and End Connection Style
BODY SIZE,
NPS (DN)
BODY MATERIAL
Cast Iron Steel Stainless Steel Hastelloy
®
C
1-1/2 and 2 (40 and 50) NPT
NPT, SWE, CL150 RF,
CL300 RF, PN 16/25/40
NPT, SWE, CL150 RF,
CL300 RF, PN 16/25/40
CL150 RF
Table 2. Control Pressure Ranges
CONTROL PRESSURE RANGE
SPRING PART
NUMBER
SPRING COLOR
SPRING WIRE DIAMETER,
INCHES (mm)
SPRING FREE LENGTH,
INCHES (mm)
2 to 5-inches w.c.
5 to 15-inches w.c.
8-inches w.c. to 1 psig
(5 to 12 mbar)
(1)(2)
(12 to 37 mbar)
(1)(2)
(20 to 69 mbar)
1A200127022
1B766627062
0B019427052
Red
Gray
Dark Green
0.135 (3,43)
0.156 (3,96)
0.187 (4,75)
5.38 (137)
6.63 (168)
6.00 (152)
1 to 2.8 psig
2 to 3.5 psig
4 to 7 psig
(69 mbar to 0,19 bar)
(0,14 to 0,24 bar)
(0,28 to 0,48 bar)
0A081127202
0Y066427022
1H802427032
Orange
Green stripe
Red
0.250 (6,35)
0.363 (9,22)
0.406 (10,3)
6.00 (152)
6.00 (152)
6.00 (152)
1. Spring ranges based on spring case installed pointed down. When installed pointed up, spring range increases 2-inches w.c. (5 mbar).
2. Do not use Fluorocarbon (FKM) diaphragm with these springs at diaphragm temperatures lower than 60°F (16°C).
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