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Spring Loaded Check Valves

Spring Loaded Check Valves

Our spring-loaded plastic check valves deliver consistent one-way flow regulation across a wide range of pressures. Designed for both liquid and gas applications, they’re well-suited to industrial, laboratory, and OEM use where dependable valve actuation is essential. ISM offers multiple sizes and connection types to match your system's needs.

Spring Loaded Check Valves Options

  • CVMC Series - Threaded Polypropylene Check Valve

    CVMC Series - Threaded Polypropylene Check Valve

    • Thread sizes: 1/4", 3/8", 1/2", or 3/4" Female NPT; 1/2" also available in Male NPT
    • Seal materials: Buna-N, EPDM, or Viton
    • Spring material: Stainless Steel or Hastelloy
    • Polypropylene poppet
    • Polypropylene body (White or Black)
    • Maximum flow pressure: 125 PSI
    • Horizontal or vertical installation

  • CVNUCB Series - Barbed Check Valve

    CVNUCB Series - Barbed Check Valve

    • Equal and reducing sizes
    • Hose barbs: 1/8" to 3/4"
    • Cracking pressures: 1/2, 1, 3, 6, and 10 psi
    • Seals available in Buna-N, EPDM, and Viton
    • Natural nylon construction
    • Maximum working pressure 25 or 50 psi, parts are not individually marked, please inquire
    • Spring tolerance: ±30%

    Made to order

  • CVNHPN Series - Nylon Nipple Check Valve

    CVNHPN Series - Nylon Nipple Check Valve

    • Equal and reducing sizes
    • Male NPT threads: 1/8" to 3/4"
    • Cracking pressures: 1/2, 1, 3, 6, and 10 psi
    • Seals available in Buna-N, EPDM, and Viton
    • Natural nylon construction
    • Maximum working pressure 25 or 50 psi, parts are not individually marked, please inquire
    • Spring tolerance: ±30%

    Made to order

  • CVNMCB Series - Nylon Check Valve Adapter

    CVNMCB Series - Nylon Check Valve Adapter

    • Equal and reducing sizes
    • Flows from barb to thread and thread to barb
    • Cracking pressures: 1/2, 1, 3, 6, and 10 psi
    • Seals available in Buna-N, EPDM, and Viton
    • Natural nylon construction
    • 3/16" to 1" hose barb
    • 1/8" to 1" Male NPT
    • Maximum working pressure 25 or 50 psi, parts are not individually marked, please inquire
    • Spring tolerance: ±30%

    Made to order

  • CVSC Series - Lightweight Check Valve

    CVSC Series - Lightweight Check Valve

    • Inlets consisting of 1/8", 3/16", or 1/4" hose barbs
    • Outlet sizes include: 1/8", 3/16", or 1/4" hose barbs and 1/8" Male NPT
    • Valves are available without a spring, or with 302 Stainless Steel (available with 316 Stainless Steel ball), or Hastelloy (available only with Teflon® ball)
    • Body materials include: White Nylon, Polypropylene, or Kynar
    • 125 psi maximum operating pressure

  • JCV Series - Compression x Male NPT Check Valve

    JCV Series - Compression x Male NPT Check Valve

    • 1/4" to 3/4" compression
    • 1/4" to 1/2" Male NPT
    • Cracking pressures: 1/2, 1, 3, 6, and 10 psi
    • Seals available in Buna-N, EPDM, and Viton
    • Natural nylon construction
    • Maximum working pressure 25 or 50 psi, parts are not individually marked, please inquire
    • Spring tolerance: ±30%

    Made to order

  • CVS Series - Hi-Strength Push-In Check Valves

    CVS Series - Hi-Strength Push-In Check Valves

    • Push-In and threads
    • Buna-N, Viton, or EPDM seals available
    • Cracking pressure: 1/3 to 12 psi
    • Body material: Gray PVC, Black Glass-Filled Nylon
    • Spring material: Hastelloy or 302 Stainless Steel
    • Ball material: 316 Stainless Steel and Teflon
    • Maximum operating pressure: 125 psi
    • Excellent for liquid and air service

  • CVS Series - Hi-Strength Kynar Check Valves

    CVS Series - Hi-Strength Kynar Check Valves

    • Hose barbs and threads
    • Buna-N, Viton, or EPDM seals available
    • Cracking pressure: 1/3 to 12 psi
    • Body material: Black Kynar
    • Spring material: Hastelloy or 302 Stainless Steel
    • Ball material: 316 Stainless Steel and Teflon
    • Maximum operating pressure: 125 psi
    • Excellent for liquid and air service

  • CVS Series - Hi-Strength Nylon Check Valves

    CVS Series - Hi-Strength Nylon Check Valves

    • Hose barbs and threads
    • Buna-N, Viton, or EPDM seals available
    • Cracking pressure: 1/3 to 12 psi
    • Body material: Black Glass-Filled Nylon
    • Spring material: Hastelloy or 302 Stainless Steel
    • Ball material: 316 Stainless Steel and Teflon
    • Maximum operating pressure: 125 psi
    • Excellent for liquid and air service

  • CVS Series - Hi-Strength Polypropylene Check Valves

    CVS Series - Hi-Strength Polypropylene Check Valves

    • Hose barbs and threads
    • Buna-N, Viton, or EPDM seals available
    • Cracking pressure: 1/3 to 12 psi
    • Body material: White Glass-Filled Polypropylene
    • Spring material: Hastelloy or 302 Stainless Steel
    • Ball material: 316 Stainless Steel and Teflon
    • Maximum operating pressure: 125 psi
    • Excellent for liquid and air service

  • CVS Series - Hi-Strength PVC Check Valves

    CVS Series - Hi-Strength PVC Check Valves

    • Hose barbs and threads
    • Buna-N, Viton, or EPDM seals available
    • Cracking pressure: 1/3 to 12 psi
    • Body material: Gray PVC
    • Spring material: Hastelloy or 302 Stainless Steel
    • Ball material: 316 Stainless Steel and Teflon
    • Maximum operating pressure: 125 psi
    • Excellent for liquid and air service
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