426 SERIES CHECK VALVE

Maximum Operating Pressure — 125 psi
Maximum Operating Temperature — 140°F
Seat Area Open Diameter — .250

Design Considerations

The 426 Series Check Valve design promotes multiple configurations to fit the exact end use application. Gray PVC with 1 psi stainless spring and ball is the standard configuration. Most PVC and White Filled Polypropylene configurations are available as NSF Standard 42 Certified. Nylon, PVDF (Kynar®) and Glass Filled Polypropylene are available for chemical resistance applications. MakroBlend is an NSF Standard 51 Approved Material. Hastelloy is a superior chemically resistant spring material. Teflon® balls are standard with Hastelloy springs for chemical resistance applications.

Options

Material Options	Gray PVC (Standard), White PVC, Black Polypropylene, White Polypropylene, Black Nylon, White Nylon, MakroBlend, Black PVDF (Kynar®)
Seal Options	Buna-N, Ethylene Propylene, Fluoroelastomer (Viton®)
End Options	1/8, 1/4 Male and Female NPT 1/8, 1/4, 5/16, 3/8, 1/2 Hose Barb 1/8, 1/4 JACO 1/4, 3/8 SMC Push-To-Connect 3/8 BIB (Smooth Barb)
Cracking Pressure	302 Stainless Spring - 1/3 psi, 1 psi (Standard), 1.5, 3, 5, 7, 10, 12 psi or No Spring, Hastelloy Spring - 1/3, 1, 3, 5, 12 psi
Ball Material	316 Stainless - Standard With Stainless Spring Teflon® - Standard With Hastelloy Spring

Example of how to order

Body Material
PVC

Inlet End
1/4 MNPT

Outlet End
1/4 FNPT

Seal
Buna-N

Spring
3 psi

Ball Material
Stainless

SMC Part Number: PVC 426-4M4F-B,3#

The flow arrow on the body will point from Inlet to Outlet. SMC Part Numbers are a description of the valve as read left to right, Inlet to Outlet.
Example: PVC 426-4M4F-B,3# = 1/4 MNPT Inlet x 1/4 FNPT Outlet