Product Video

Product Video

SMC Check Valves for Air or Liquid

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

  • Polypropylene
  • EPDM, Buna, Aflas® or FKM seals
  • Hastelloy or 302 SS spring
  • High flow rate
  • Seat area open diameter: .438"
  • Positive seal at very low back pressure or slight vacuum
  • Maximum pressure: 125 psi
  • Maximum temperature: 140°F
Stock Description Catalog Pg. Price
1/4" FNPT x 1/4" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22231
1/4" FNPT x 1/4" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$7.31​/Each
Save 5%12+$6.94/Each
Save 10%24+$6.57/Each
Save 15%72+$6.21/Each
P-410
$7.31​/Each
In Stock
1/4" FNPT x 1/4" FNPT Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22637
1/4" FNPT x 1/4" FNPT Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$6.93​/Each
Save 5%12+$6.58/Each
Save 10%24+$6.23/Each
Save 15%72+$5.89/Each
P-NEW
$6.93​/Each
On Order
1/4" FNPT x 1/4" FNPT Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22638
1/4" FNPT x 1/4" FNPT Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$6.93​/Each
Save 5%12+$6.58/Each
Save 10%24+$6.23/Each
Save 15%72+$5.89/Each
P-NEW
$6.93​/Each
In Stock
1/4" FNPT x 1/4" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
22639
1/4" FNPT x 1/4" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
$9.95​/Each
Save 5%12+$9.45/Each
Save 10%24+$8.95/Each
Save 15%72+$8.45/Each
P-NEW
$9.95​/Each
In Stock
3/8" FNPT x 3/8" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22232
3/8" FNPT x 3/8" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$7.53​/Each
Save 5%12+$7.15/Each
Save 10%24+$6.77/Each
Save 15%72+$6.40/Each
P-410
$7.53​/Each
In Stock
3/8" FNPT x 3/8" FNPT Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22640
3/8" FNPT x 3/8" FNPT Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$7.11​/Each
Save 5%12+$6.75/Each
Save 10%24+$6.39/Each
Save 15%72+$6.04/Each
P-NEW
$7.11​/Each
In Stock
3/8" FNPT x 3/8" FNPT Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22641
3/8" FNPT x 3/8" FNPT Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$7.11​/Each
Save 5%12+$6.75/Each
Save 10%24+$6.39/Each
Save 15%72+$6.04/Each
P-NEW
$7.11​/Each
On Order
3/8" FNPT x 3/8" FNPT Polypropylene Check Valve with FKM Seals, 1/3 Cracking Pressure & Hastelloy Spring
22642
3/8" FNPT x 3/8" FNPT Polypropylene Check Valve with FKM Seals, 1/3 Cracking Pressure & Hastelloy Spring
$10.14​/Each
Save 5%12+$9.63/Each
Save 10%24+$9.12/Each
Save 15%72+$8.61/Each
P-NEW
$10.14​/Each
On Order
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22210
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$8.02​/Each
Save 5%12+$7.61/Each
Save 10%24+$7.21/Each
Save 15%72+$6.81/Each
P-410
$8.02​/Each
In Stock
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22643
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$7.57​/Each
Save 5%12+$7.19/Each
Save 10%24+$6.81/Each
Save 15%72+$6.43/Each
P-NEW
$7.57​/Each
On Order
1/2" FNPT x 1/2' FNPT Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22644
1/2" FNPT x 1/2' FNPT Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$7.57​/Each
Save 5%12+$7.19/Each
Save 10%24+$6.81/Each
Save 15%72+$6.43/Each
P-NEW
$7.57​/Each
On Order
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with EPDM Seals/No Spring
22645
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with EPDM Seals/No Spring
$7.35​/Each
Save 5%12+$6.98/Each
Save 10%24+$6.61/Each
Save 15%72+$6.24/Each
P-NEW
$7.35​/Each
On Order
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
22352
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
$10.85​/Each
Save 5%12+$10.30/Each
Save 10%24+$9.76/Each
Save 15%72+$9.22/Each
P-NEW
$10.85​/Each
In Stock
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with FKM Seals, 3 PSI Cracking Pressure & Hastelloy Spring
22646
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with FKM Seals, 3 PSI Cracking Pressure & Hastelloy Spring
$11.23​/Each
Save 5%12+$10.66/Each
Save 10%24+$10.10/Each
Save 15%72+$9.54/Each
P-NEW
$11.23​/Each
On Order
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with EPDM Seals, 7 PSI Cracking Pressure & Hastelloy Spring
22647
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with EPDM Seals, 7 PSI Cracking Pressure & Hastelloy Spring
$11.28​/Each
Save 5%12+$10.71/Each
Save 10%24+$10.15/Each
Save 15%72+$9.58/Each
P-NEW
$11.28​/Each
On Order
1/2" FNPT x 1/2" MNPT Polypropylene Check Valve with EPDM Seals, 7 PSI Cracking Pressure & Hastelloy Spring
22648
1/2" FNPT x 1/2" MNPT Polypropylene Check Valve with EPDM Seals, 7 PSI Cracking Pressure & Hastelloy Spring
$11.28​/Each
Save 5%12+$10.71/Each
Save 10%24+$10.15/Each
Save 15%72+$9.58/Each
P-NEW
$11.28​/Each
In Stock
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with Aflas® Seals, 3 PSI Cracking Pressure & Hastelloy Spring
22649
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with Aflas® Seals, 3 PSI Cracking Pressure & Hastelloy Spring
$16.25​/Each
Save 5%12+$15.43/Each
Save 10%24+$14.62/Each
Save 15%72+$13.81/Each
P-NEW
$16.25​/Each
On Order
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
22650
1/2" FNPT x 1/2" FNPT Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
$10.77​/Each
Save 5%12+$10.23/Each
Save 10%24+$9.69/Each
Save 15%72+$9.15/Each
P-NEW
$10.77​/Each
In Stock
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22211
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$9.07​/Each
Save 5%12+$8.61/Each
Save 10%24+$8.16/Each
Save 15%72+$7.71/Each
P-410
$9.07​/Each
In Stock
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22651
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$8.58​/Each
Save 5%12+$8.15/Each
Save 10%24+$7.72/Each
Save 15%72+$7.29/Each
P-NEW
$8.58​/Each
On Order
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22652
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$9.51​/Each
Save 5%12+$9.03/Each
Save 10%24+$8.55/Each
Save 15%72+$8.08/Each
P-NEW
$9.51​/Each
In Stock
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
22653
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
$11.27​/Each
Save 5%12+$10.70/Each
Save 10%24+$10.14/Each
Save 15%72+$9.58/Each
P-NEW
$11.27​/Each
In Stock
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with Buna-N Seals/No Spring
22654
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with Buna-N Seals/No Spring
$8.58​/Each
Save 5%12+$8.15/Each
Save 10%24+$7.72/Each
Save 15%72+$7.29/Each
P-NEW
$8.58​/Each
In Stock
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with Buna-N Seals, 1/2 PSI Cracking Pressure & 302 SS Spring
22655
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with Buna-N Seals, 1/2 PSI Cracking Pressure & 302 SS Spring
$12.90​/Each
Save 5%12+$12.25/Each
Save 10%24+$11.61/Each
Save 15%72+$10.96/Each
P-NEW
$12.90​/Each
On Order
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
22656
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring
$8.58​/Each
Save 5%12+$8.15/Each
Save 10%24+$7.72/Each
Save 15%72+$7.29/Each
P-NEW
$8.58​/Each
On Order
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
22657
3/4" FNPT x 3/4" FNPT Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring
$11.69​/Each
Save 5%12+$11.10/Each
Save 10%24+$10.52/Each
Save 15%72+$9.93/Each
P-NEW
$11.69​/Each
On Order

Other Check Valves

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
Chemtrol® True Union Red Kynar® PVDF Check Valves
Chemtrol® True Union Red Kynar® PVDF Check Valves
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
Hayward® YC Series Y-Check Valves
Hayward® YC Series Y-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
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
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
True Union Low Extractable PVC Ball Check Valves
True Union Low Extractable PVC Ball Check Valves
Shop Now
TrueSeal™ Check Valve
TrueSeal™ Check Valve
Shop Now