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

Stock	Description	Catalog Pg.	Price
22231	1/4" FNPT x 1/4" FNPT Series 694 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 8/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	8/Each In Stock
22637	1/4" FNPT x 1/4" FNPT Series 694 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 7.64/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	7.64/Each In Stock
22638	1/4" FNPT x 1/4" FNPT Series 694 Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 7.64/Each Out of Stock (On Order) Save 5%12+ Save 10%24+ Save 15%72+	P-447	7.64/Each Out of Stock (On Order)
22639	1/4" FNPT x 1/4" FNPT Series 694 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring 10.96/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	10.96/Each In Stock
22232	3/8" FNPT x 3/8" FNPT Series 693 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 8.23/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	8.23/Each In Stock
22640	3/8" FNPT x 3/8" FNPT Series 693 Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 7.85/Each Out of Stock (On Order) Save 5%12+ Save 10%24+ Save 15%72+	P-447	7.85/Each Out of Stock (On Order)
22641	3/8" FNPT x 3/8" FNPT Series 693 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 7.85/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	7.85/Each In Stock
22642	3/8" FNPT x 3/8" FNPT Series 693 Polypropylene Check Valve with FKM Seals, 1/3 Cracking Pressure & Hastelloy Spring 11.18/Each Out of Stock (On Order) Save 5%12+ Save 10%24+ Save 15%72+	P-447	11.18/Each Out of Stock (On Order)
22210	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 8.78/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	8.78/Each In Stock
22643	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 8.35/Each Out of Stock (On Order) Save 5%12+ Save 10%24+ Save 15%72+	P-447	8.35/Each Out of Stock (On Order)
22644	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 8.35/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	8.35/Each In Stock
22645	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals/No Spring 8.35/Each Out of Stock (On Order) Save 5%12+ Save 10%24+ Save 15%72+	P-447	8.35/Each Out of Stock (On Order)
22352	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring 11.88/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	11.88/Each In Stock
22646	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with FKM Seals, 3 PSI Cracking Pressure & Hastelloy Spring 12.37/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	12.37/Each In Stock
22647	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals, 7 PSI Cracking Pressure & Hastelloy Spring 12.43/Each Out of Stock (On Order) Save 5%12+ Save 10%24+ Save 15%72+	P-447	12.43/Each Out of Stock (On Order)
22648	1/2" FNPT x 1/2" MNPT Series 685 Polypropylene Check Valve with EPDM Seals, 7 PSI Cracking Pressure & Hastelloy Spring 12.43/Each Out of Stock (On Order) Save 5%12+ Save 10%24+ Save 15%72+	P-447	12.43/Each Out of Stock (On Order)
22649	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with Aflas® Seals, 3 PSI Cracking Pressure & Hastelloy Spring 17.91/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	17.91/Each In Stock
22650	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring 11.87/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	11.87/Each In Stock
22211	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 9.92/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	9.92/Each In Stock
22651	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 9.45/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	9.45/Each In Stock
22652	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 10.49/Each Special Order Save 5%12+ Save 10%24+ Save 15%72+	P-447	10.49/Each Special Order
22653	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring 12.43/Each Out of Stock (On Order) Save 5%12+ Save 10%24+ Save 15%72+	P-447	12.43/Each Out of Stock (On Order)
22654	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with Buna-N Seals/No Spring 9.45/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	9.45/Each In Stock
22655	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with Buna-N Seals, 1/2 PSI Cracking Pressure & 302 SS Spring 14.23/Each Out of Stock (On Order) Save 5%12+ Save 10%24+ Save 15%72+	P-447	14.23/Each Out of Stock (On Order)
22656	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 9.45/Each Out of Stock (On Order) Save 5%12+ Save 10%24+ Save 15%72+	P-447	9.45/Each Out of Stock (On Order)
22657	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring 12.89/Each In Stock Save 5%12+ Save 10%24+ Save 15%72+	P-447	12.89/Each In Stock

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