VALVE CUT-OUT
A.
Main Stem
B.
Pressure Disc/seal (in run/open)
C.
Pressure Disc/seal (in trip/closed)
D.
Vent Seal Gland
E.
Reset Knob (latches valve open)
F.
Manual Trip Knob (not available for M5081FS)
G.
Indicator Button (out with valve open)
H.
Pipe Plug
A
B
D
E
F
Understanding the Basic Operation
of the Fuel Shut-off Valve
The valve below is shown in the run (open) position.
Pressure is equalized, seat (
B
) is open, allowing
the fuel to flow. When valve is in the tripped position
(closed), seat closes (
C
).
The vent (
D
) opens to relieve trapped downstream fuel
to vent to a non-hazardous area.
C
NOTE:
If the vent-after-tripping feature is not used,
remove O-ring (
D
), to avoid condensation accumulation
that can hamper trip action.
Be sure
to replace Pipe Plug (
H
) and to clean vent
periodically.
Vent to relieve trapped fuel
outside the hazardous area.
Terminal Block is
within this case.
G
Pipe Plug (remove to
install vent tube).
TYPICAL MODEL (M5081) SHOWN
H
FLOW CHARACTERISTICS
250
[7.08]
500
[14.16]
1000
[28.32]
1250
[35.40]
1500
[42.48]
1750
[4956]
2000
[56.64]
2250
[63.72]
2500
[70.80]
3000
[84.96]
2750
[77.88]
750
[21.24]
0
1.0
[25.4]
2.0
[50.8]
3.0
[76.2]
4.0
[101.6]
5.0
[127.0]
6.0
[152.4]
7.0
[177.8]
8.0
[203.2]
9.0
[228.6]
10.0
[254.0]
4 oz. (0.11 kg.)
10 oz. (0.28 kg.)
5 psig (34 kPa) [0.34 bar]
10 psig (69 kPa) [0.69 bar]
20 psig (138 kPa) [1.38 bar]
30 psig (207 kPa) [2.07 bar]
4 oz. (0.11 kg.)
10 oz. (0.28 kg.)
5 psig (34 kPa) [0.34 bar]
10 psig (69 kPa) [0.69 bar]
20 psig (138 kPa) [1.38 bar]
30 psig (207 kPa) [2.07 bar]
4 oz. (.11 kg.)
4 oz. (.11 kg.)
10 oz. (.28 kg.)
10 psig (69 kPa) [.69 bar]
20 psig (138 kPa) [1.38 bar]
30 psig (207 kPa) [2.07 bar]
500
[14.16]
1000
[28.32]
2000
[56.64]
2500
[70.80]
3000
[84.96]
3500
[99.12]
4000
[113.28]
4500
[127.44]
5000
[141.60]
1500
[42.48]
0
1.0
[25.4]
2.0
[50.8]
3.0
[76.2]
4 oz. (.11 kg.)
10 oz. (.28 kg.)
10 psig (69 kPa) [.69 bar]
20 psig (138 kPa) [1.38 bar]
30 psig (207 kPa) [2.07 bar]
M2582 Series
M5081 and
M5180 Series
Inches water column (
∆
p) drop across valve.
Millimeters water column in brackets [ ].
Standard cubic feet per hour. Cubic meters per hour in brackets [ ].
Inches water column (
∆
p) drop across valve.
Millimeters water column in brackets [ ].
Standard cubic feet per hour. Cubic meters per hour in brackets [ ].
Installation M-7980N page 2 of 12
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