Product Video
Product Video

SMC Check Valves for Air or Liquid

The 694, 693, 685, and 687 Series check valves can be used for a wide range of air and fluid applications.

  • Polypropylene
  • EPDM, Buna, Aflas®, or FKM seals
  • Hastelloy or 302 stainless steel spring
  • High flow rate
  • Seat area open diameter: 0.438"
  • Positive seal at very low back pressure or slight vacuum
  • Maximum pressure: 125 psi
  • Maximum temperature: 140°F
Item # Description Catalog Pg. Price Add to Cart
1/4" FNPT x 1/4" FNPT Series 694 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22231
9/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
9/Each
1/4" FNPT x 1/4" FNPT Series 694 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22637
8.59/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
8.59/Each
1/4" FNPT x 1/4" FNPT Series 694 Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22638
8.59/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
8.59/Each
1/4" FNPT x 1/4" FNPT Series 694 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
Item 22639
12.32/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
12.32/Each
3/8" FNPT x 3/8" FNPT Series 693 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22232
9.25/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
9.25/Each
3/8" FNPT x 3/8" FNPT Series 693 Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22640
8.49/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
8.49/Each
3/8" FNPT x 3/8" FNPT Series 693 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22641
8.49/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
8.49/Each
3/8" FNPT x 3/8" FNPT Series 693 Polypropylene Check Valve with FKM Seals, 1/3 Cracking Pressure & Hastelloy Spring
Item 22642
12.56/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
12.56/Each
1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22210
9.49/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
9.49/Each
1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22643
9.38/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
9.38/Each
1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22644
9.38/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
9.38/Each
1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals/No Spring
Item 22645
9.38/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
9.38/Each
1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
Item 22352
13.34/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
13.34/Each
1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with FKM Seals, 3 PSI Cracking Pressure & Hastelloy Spring
Item 22646
13.9/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
13.9/Each
1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals, 7 PSI Cracking Pressure & Hastelloy Spring
Item 22647
13.98/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
13.98/Each
1/2" FNPT x 1/2" MNPT Series 685 Polypropylene Check Valve with EPDM Seals, 7 PSI Cracking Pressure & Hastelloy Spring
Item 22648
13.98/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
13.98/Each
1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with Aflas® Seals, 3 PSI Cracking Pressure & Hastelloy Spring
Item 22649
20.13/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
20.13/Each
1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
Item 22650
13.34/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
13.34/Each
3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22211
11.16/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
11.16/Each
3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22651
10.63/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
10.63/Each
3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22652
11.79/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
11.79/Each
3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
Item 22653
13.44/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
13.44/Each
3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with Buna-N Seals/No Spring
Item 22654
10.63/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
10.63/Each
3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with Buna-N Seals, 1/2 PSI Cracking Pressure & 302 SS Spring
Item 22655
16.01/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
16.01/Each
3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
Item 22656
10.63/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
10.63/Each
3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
Item 22657
14.5/Each
Save 5% when you buy 12+
Save 10% when you buy 24+
Save 15% when you buy 72+
P-477
14.5/Each

More in This Category

304 Stainless Steel Check Valves
304 Stainless Steel Check Valves
Shop Now
316 Stainless Steel Check Valves
316 Stainless Steel Check Valves
Shop Now
Acetal Check Valves
Acetal Check Valves
Shop Now
Acetal Foot Valves
Acetal Foot Valves
Shop Now
Asahi® PVDF Check Valves
Asahi® PVDF Check Valves
Shop Now
Banjo® Polypropylene Check Valves
Banjo® Polypropylene Check Valves
Shop Now
Cepex Ball Check Valves
Cepex Ball Check Valves
Shop Now
Cepex Economy Wafer Check Valves
Cepex Economy Wafer Check Valves
Shop Now
Check Valves
Check Valves
Shop Now
Check Valves for Vacuum
Check Valves for Vacuum
Shop Now
Colonial Swing Check Valve
Colonial Swing Check Valve
Shop Now
Colonial Wafer Check Valves
Colonial Wafer Check Valves
Shop Now
CV Series Single Barb Check Valves
CV Series Single Barb Check Valves
Shop Now
GF  PVC Cone Check Valves Type 561 & 562
GF PVC Cone Check Valves Type 561 & 562
Shop Now
GF VC Y-Check Clear PVC Valves
GF VC Y-Check Clear PVC Valves
Shop Now
Hayward TC Series PVC True Union Ball Check Valves
Hayward TC Series PVC True Union Ball Check Valves
Shop Now
Hayward® CPVC True Union Ball Check Valves
Hayward® CPVC True Union Ball Check Valves
Shop Now
Hayward® Polypropylene True Union Ball Check Valves
Hayward® Polypropylene True Union Ball Check Valves
Shop Now
Hayward® Swing Check Valves
Hayward® Swing Check Valves
Shop Now
Hayward® WCV Series Wafer Check Valves
Hayward® WCV Series Wafer Check Valves
Shop Now
Hayward® YC Series True Union Y-Check Valves
Hayward® YC Series True Union Y-Check Valves
Shop Now
Nibco® Chemtrol® True Union Red Kynar® PVDF Check Valves
Nibco® Chemtrol® True Union Red Kynar® PVDF Check Valves
Shop Now
NIBCO® Chemtrol® TruUnion Ball Check Valves
NIBCO® Chemtrol® TruUnion Ball Check Valves
Shop Now
Plast-O-Matic CKD Compact Diaphragm Check Valves
Plast-O-Matic CKD Compact Diaphragm Check Valves
Shop Now
Plast-O-Matic CKM Diaphragm Check Valves
Plast-O-Matic CKM Diaphragm Check Valves
Shop Now
Plast-O-Matic CKS Diaphragm Check Valves
Plast-O-Matic CKS Diaphragm Check Valves
Shop Now
Polypropylene Check Valves
Polypropylene Check Valves
Shop Now
Praher K6 Wafer Check Valves
Praher K6 Wafer Check Valves
Shop Now
PVC & CPVC Foot Valve Screens
PVC & CPVC Foot Valve Screens
Shop Now
PVC Backwater Valves
PVC Backwater Valves
Shop Now
PVC Compact Foot Valve Screens
PVC Compact Foot Valve Screens
Shop Now
PVC Heavy Duty Check Valves
PVC Heavy Duty Check Valves
Shop Now
SMC 406 Series Check Valves
SMC 406 Series Check Valves
Shop Now
SMC 426 Series PVC Check Valves for Air or Liquid
SMC 426 Series PVC Check Valves for Air or Liquid
Shop Now
SMC 695 Series Mini Check Valves
SMC 695 Series Mini Check Valves
Shop Now
Spring Check Valves
Spring Check Valves
Shop Now
Sump Pump Swing Check Valve
Sump Pump Swing Check Valve
Shop Now
Super Speedfit® Acetal Check Valve
Super Speedfit® Acetal Check Valve
Shop Now
True Union Industrial Ball Check Valves
True Union Industrial Ball Check Valves
Shop Now
TrueSeal™ Check Valve
TrueSeal™ Check Valve
Shop Now