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Safety Check Valves

Safety Check Valves


Features:
  • High flow valve to provide 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
  • Conforms to OSHA regulation 1926.302 (b) (7) requiring a safety device at the source of the air supply and at branch air lines
  • Applications include temporary plant/factory air, 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.
  • Does not prevent backflow

Construction:
  • Solid brass body and valve
  • Stainless steel spring and roll pin
  • Maximum working pressure: 250 PSI
  • Maximum temperature: 250°F

Use:
  • Safety check valves operate by using 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.


Please contact us at any of our locations for further assistance.
Description Item Code Qty
1/4" MALE NPT X FEMALE NPT 23-29 SCFM CUT-OFF FLOW RATE SCVL2
3/8" MALE NPT X FEMALE NPT 39-47 SCFM CUT-OFF FLOW RATE SCVM3
3/8" MALE NPT X FEMALE NPT 52-65 SCFM CUT-OFF FLOW RATE SCVS3
1/2" MALE NPT X FEMALE NPT 70-78 SCFM CUT-OFF FLOW RATE SCVM4
1/2" MALE NPT X FEMALE NPT 80-96 SCFM CUT-OFF FLOW RATE SCVS4
3/4" MALE NPT X FEMALE NPT 72-88 SCFM CUT-OFF FLOW RATE SCVL6
3/4" MALE NPT X FEMALE NPT 92-108 SCFM CUT-OFF FLOW RATE SCVM6
3/4" MALE NPT X FEMALE NPT 112-128 SCFM - CUT-OFF FLOW RATE SCVR6
3/4" MALE NPT X FEMALE NPT 132-148 SCFM CUT-OFF FLOW RATE SCVJ6
3/4" MALE NPT X FEMALE NPT 160-180 SCFM CUT-OFF FLOW RATE SCVS6
3/4" MALE NPT X FEMALE NPT 180-200 SCFM CUT-OFF FLOW RATE SCVH6
1" MALE NPT X FEMALE NPT 165-195 SCFM CUT-OFF FLOW RATE SCVL8
1" MALE NPT X FEMALE NPT 220-260 SCFM CUT-OFF FLOW RATE SCVM8
1" MALE NPT X FEMALE NPT 280-320 SCFM CUT-OFF FLOW RATE SCVS8
1" MALE NPT X FEMALE NPT 310-340 SCFM CUT-OFF FLOW RATE SCVH8
1-1/4" MALE NPT X FEMALE NPT 260-290 SCFM CUT-OFF FLOW RATE SCVL10
1-1/4" MALE NPT X FEMALE NPT 300-340 SCFM CUT-OFF FLOW RATE SCVM10
1-1/4" MALE NPT X FEMALE NPT 440-500 SCFM CUT-OFF FLOW RATE SCVS10
1-1/4" MALE NPT X FEMALE NPT 570-630 SCFM CUT-OFF FLOW RATE SCVH10
1-1/2" MALE NPT X FEMALE NPT 300-360 SCFM CUT-OFF FLOW RATE SCVL12
1-1/2" MALE NPT X FEMALE NPT 470-530 SCFM CUT-OFF FLOW RATE SCVM12
1-1/2" MALE NPT X FEMALE NPT 640-720 SCFM CUT-OFF FLOW RATE SCVS12
1-1/2" MALE NPT X FEMALE NPT 750-830 SCFM CUT-OFF FLOW RATE SCVH12
2" MALE NPT X FEMALE NPT 510-590 SCFM CUT-OFF FLOW RATE SCVL16
2" MALE NPT X FEMALE NPT 725-825 SCFM CUT-OFF FLOW RATE SCVM16
2" MALE NPT X FEMALE NPT 900-1050 SCFM CUT-OFF FLOW RATE SCVS16
2" MALE NPT X FEMALE NPT 1100-1200 SCFM CUT-OFF FLOW RATE SCVH16
3" MALE NPT X FEMALE NPT 1200-1400 SCFM CUT-OFF FLOW RATE SCVL24
3" MALE NPT X FEMALE NPT 2400-2700 SCFM CUT-OFF FLOW RATE SCVS24
3" MALE NPT X FEMALE NPT 2850-3050 CUT-OFF FLOW RATE SCVH24