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
Item 22231	1/4" FNPT x 1/4" FNPT Series 694 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 8.65/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	8.65/Each In Stock
Item 22637	1/4" FNPT x 1/4" FNPT Series 694 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 8.26/Each Out of Stock (On Order) Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	8.26/Each Out of Stock (On Order)
Item 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 8.26/Each Out of Stock (On Order) Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	8.26/Each Out of Stock (On Order)
Item 22639	1/4" FNPT x 1/4" FNPT Series 694 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring 11.85/Each Out of Stock (On Order) Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	11.85/Each Out of Stock (On Order)
Item 22232	3/8" FNPT x 3/8" FNPT Series 693 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 8.89/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	8.89/Each In Stock
Item 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 8.49/Each Out of Stock (On Order) Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	8.49/Each Out of Stock (On Order)
Item 22641	3/8" FNPT x 3/8" FNPT Series 693 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 8.49/Each Out of Stock (On Order) Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	8.49/Each Out of Stock (On Order)
Item 22642	3/8" FNPT x 3/8" FNPT Series 693 Polypropylene Check Valve with FKM Seals, 1/3 Cracking Pressure & Hastelloy Spring 12.08/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	12.08/Each In Stock
Item 22210	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 9.49/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	9.49/Each In Stock
Item 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 9.02/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	9.02/Each In Stock
Item 22644	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 9.02/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	9.02/Each In Stock
Item 22645	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals/No Spring 9.02/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	9.02/Each In Stock
Item 22352	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring 12.82/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	12.82/Each In Stock
Item 22646	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with FKM Seals, 3 PSI Cracking Pressure & Hastelloy Spring 13.37/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	13.37/Each In Stock
Item 22647	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals, 7 PSI Cracking Pressure & Hastelloy Spring 13.44/Each Out of Stock (On Order) Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	13.44/Each Out of Stock (On Order)
Item 22648	1/2" FNPT x 1/2" MNPT Series 685 Polypropylene Check Valve with EPDM Seals, 7 PSI Cracking Pressure & Hastelloy Spring 13.44/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	13.44/Each In Stock
Item 22649	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with Aflas® Seals, 3 PSI Cracking Pressure & Hastelloy Spring 19.36/Each Out of Stock (On Order) Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	19.36/Each Out of Stock (On Order)
Item 22650	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring 12.83/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	12.83/Each In Stock
Item 22211	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 10.73/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	10.73/Each In Stock
Item 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 10.22/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	10.22/Each In Stock
Item 22652	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 11.34/Each Special Order Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	11.34/Each Special Order
Item 22653	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with Buna-N Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring 13.44/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	13.44/Each In Stock
Item 22654	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with Buna-N Seals/No Spring 10.22/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	10.22/Each In Stock
Item 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 15.39/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	15.39/Each In Stock
Item 22656	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & 302 SS Spring 10.22/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	10.22/Each In Stock
Item 22657	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring 13.94/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-455	13.94/Each In Stock