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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
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
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
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
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
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
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 On Order
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 In Stock
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 In Stock
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
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 In Stock
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 In Stock
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
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
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
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 In Stock
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 On Order
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
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 On Order
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
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 In Stock
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
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 On Order
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 On Order
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 In Stock
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
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

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