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 (KynarŽ) 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. TeflonŽ 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
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