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Air Fittings
142
DPL116
877.963.4966 •
dixonvalve.comF
Safety Check Valves
Check Valve in
Open Position
Check Valve in
Closed Position
Application:
•
used in temporary plant/factory air lines, construction sites, shipyards or utilities
•
not for use in applications where 100% of the available air is required, i.e. sand blast, pile driving rigs,expansion
joint blow down pipes, etc.
Features:
•
high flow valve provides optimum performance
•
controls excess air flow (SCFM) in only one direction
•
automatically senses change in air flow and shuts off the flow in the event of a surge in excess of valve flow rating thus
preventing hose whip
•
solid brass body and valve
•
stainless steel spring and roll pin
•
maximum operating pressure:
250 PSI
•
maximum temperature:
250°F
•
does not prevent backflow
Specification:
•
conforms to OSHA regulation 1926.302 (b) (7) requiring a safety device at the source of the air supply and at branch air lines
How It Works:
•
Safety check valves utilize the pressure differential across the valve to operate the valve and spring assembly. The pressure
differential is directly related to the flow of air (SCFM) through the valve.
•
When the pressure differential is within the operating limits - below the cutoff flow - of the unit, the force on the valve exerted
by the spring is greater than that caused by the pressure differential (see "Open Position" graphic above). The valve remains
open and normal operation continues.
•
When the pressure differential is above the cutoff limit, the force on the valve exerted by the pressure differential is greater
than the force exerted by the spring, and the valve closes (see the "Closed Position" graphic above).
•
After the repair is made, normal operation is automatically enabled when pressure across the valve equalizes through the
bleeder hole.
•
The valve spring size can be specified by determining the air flow during normal operation and by estimating the air flow if a
failure or rupture occurs.
Flow Direction
NPT and Hose
ID Size
Part #
Cut-off Flow Rate
(SCFM at 90 PSI)
Price/E NPT and Hose
ID Size
Part # Cut-off Flow Rate
(SCFM at 90 PSI)
Price/E
¼"
SCVL2
23-29
$62.58
1¼"
SCVL10
260-290
$233.05
⅜"
SCVM3
39-47
58.70
SCVM10
300-340
233.05
SCVS3
52-65
58.70
SCVS10
440-500
233.05
½"
SCVM4
70-78
63.03
SCVH10
570-630
233.05
SCVS4
80-96
63.03
1½"
SCVL12
300-360
390.90
¾"
SCVL6
72-88
99.76
SCVM12
470-530
390.90
SCVM6
92-108
99.76
SCVS12
640-720
390.90
SCVR6
112-128
99.76
SCVH12
750-830
390.90
SCVJ6
132-148
99.76
2"
SCVL16
510-590
533.79
SCVS6
160-180
99.76
SCVM16
725-825
533.79
SCVH6
180-200
99.76
SCVS16
900-1050
533.79
1"
SCVL8
165-195
112.82
SCVH16
1100-1200
533.79
SCVM8
220-260
112.82
3"
SCVL24
1200-1400
2266.67
SCVS8
280-320
112.82
SCVS24
2400-2700
2266.67
SCVH8
310-340
112.82
SCVH24
2850-3050
2266.67