Type S402Y
2
1. End connections threaded to other than ASME standards can usually be supplied.
2. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
Specifications
Body Size and End Connection Styles
(1)
NPS 3/4 or 1, NPT
Maximum Operating inlet Pressure
(2)
125 psig (8,6 bar)
Maximum allowable Emergency inlet Pressure
(2)
175 psig (12,1 bar)
allowable Outlet Pressures (Casing)
(2)
Emergency:
10 psig (0,69 bar)
Maximum Operating to avoid internal Part
Damage:
5 psig (0,35 bar)
Outlet Pressure Ranges
(2)
See Table 2
Orifice Sizes
See Table 1
Temperature Capabilities
(2)
-20° to 160°F (-29° to 71°C)
Pressure Registration
Internal
Spring Case Vent Connection
1 NPT with removable screen
(standard)
3/4 NPT with removable screen (optional)
Spring Case Vent and Body Mounting Positions
See Figure 5
External Dimensions
See Figure 6
approximate Weight
4 pounds (2 kg)
OuTlET PRESSuRE RangES
COnTROl SPRing DaTa
Part number
Color
Wire Diameter, inches (mm)
Free length, inches (mm)
4.5 to 6-inches w.c. (11 to 15 mbar)
T13539T0012
Red
0.070 (1,78)
2.50 (63,5)
5.5 to 8-inches w.c. (14 to 20 mbar)
T13527T0012
Yellow
0.067 (1,70)
2.59 (65,8)
7.5 to 9.5-inches w.c. (19 to 24 mbar)
T13563T0012
Olive drab
0.067 (1,70)
3.24 (82,3)
9.5 to 13-inches w.c. (24 to 32 mbar)
T13529T0012
Green
0.075 (1,91)
3.00 (76,2)
13-inches w.c. to 1.5 psig (32 mbar to 0,10 bar)
T13564T0012
Unpainted
0.120 (3,05)
1.93 (49,0)
1.5 to 2.5 psig (0,10 to 0,17 bar)
T13536T0012
Blue
0.120 (3,05)
2.60 (66,0)
Table 2.
Outlet Pressure Ranges and Control Spring Data
ORiFiCE SizE
ORiFiCE
COlOR CODE
WiDE-OPEn C
g
FOR
REliEF Sizing
MaxiMuM OPERaTing PRESSuRE FOR
OPTiMuM PERFORManCE
(1)
inches
mm
Psig
bar
1/8
3/16
1/4
3,2
4,8
6,4
Blue
Green
Brown
12.5
28.2
50.0
125
80
60
8,6
5,5
4,1
1. Maximum operating inlet pressure is 125 psig (8,6 bar) for all orifice sizes. The optimum performance is based on 2-inches w.c (5 mbar) boost or 1-inch w.c. (2 mbar) droop.
Table 1.
Orifice Sizes and C
g
Coefficients
Principle of Operation
Inlet pressure flows through the open orifice around
the valve disk and disk holder, around the cam stem
down the remaining length of the orifice tube and into
the outlet of the regulator body. However, not all of the
pressure passes directly from the inlet to the outlet of
the regulator. Pressure is channelled through openings
in the orifice tube and pressurizes the cavity formed by
the body and diaphragm/diaphragm head/cam stem
assembly. When downstream demand is reduced, the
pressure under the diaphragm increases. This pressure
overcomes the regulator setting (which is set by a
spring) and moves the diaphragm assembly upwards.
This upward motion is transferred to the cam stem which
in turn bears against the sliding contact point on the
back side of the disk holder.
The inclined surface of the cam then forces the disk
holder toward the orifice and reduces gas flow. If a higher
