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
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 9.18/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	9.18/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 8.76/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	8.76/Each In Stock
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 8.76/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-494	8.76/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 12.57/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	12.57/Each In Stock
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 9.44/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	9.44/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 9/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	9/Each In Stock
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 9/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-494	9/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 12.81/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	12.81/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 10.06/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	10.06/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 9.57/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	9.57/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 9.57/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	9.57/Each In Stock
Item 22645	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals/No Spring 9.57/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	9.57/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 13.61/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	13.61/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 14.18/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	14.18/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 14.26/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-494	14.26/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 14.26/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	14.26/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 20.53/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	20.53/Each In Stock
Item 22650	1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with EPDM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring 13.61/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	13.61/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 11.38/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	11.38/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 10.84/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	10.84/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 12.03/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	12.03/Each In Stock
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 14.25/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	14.25/Each In Stock
Item 22654	3/4" FNPT x 3/4" FNPT Series 687 Polypropylene Check Valve with Buna-N Seals/No Spring 10.84/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-494	10.84/Each Out of Stock (On Order)
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 16.33/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	16.33/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 10.84/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	10.84/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 14.79/Each In Stock Save 5% when you buy 12+ Save 10% when you buy 24+ Save 15% when you buy 72+	P-494	14.79/Each In Stock