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Poppet & Ball Check Valves

Poppet & Ball Check Valves

It is important to note that the poppet style check valve is usually designed to be normally closed. Poppet type valves generally utilise a spring to force shut the orifice by holding a component against a seal to replicate the backflow pressure. Spherical shapes like ball bearings with smooth surfaces, which seal against an o-ring seal, or poppets, which generally incorporate an o-ring seal and seal against a smooth face.

When the forward pressure overcomes the spring force the valve opens, at this point the term cracking pressure is given to this action. An advantage of these types of check valve design are the low cracking pressures that can be achieved with repeatability. Small differentials in forward and backflow pressures can be accommodated. Low cracking pressures such as 0.1psi are achievable.

When the check valve is fully open, flow in one direction is relatively unrestricted. When closed the check valve should not exhibit any flow. The key benefit of building a spring into a check valve’s mechanism is that it largely eliminates the effect of gravity on check valve function. Without a spring, gravity and thus the valve’s vertical orientation can become a critical factor for a check valve to work properly.

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Cracking Pressure

Poppet & Ball Check Valves

It is important to note that the poppet style check valve is usually designed to be normally closed. Poppet type valves generally utilise a spring to force shut the orifice by holding a component against a seal to replicate the backflow pressure. Spherical shapes like ball bearings with smooth surfaces, which seal against an o-ring seal, or poppets, which generally incorporate an o-ring seal and seal against a smooth face.

When the forward pressure overcomes the spring force the valve opens, at this point the term cracking pressure is given to this action. An advantage of these types of check valve design are the low cracking pressures that can be achieved with repeatability. Small differentials in forward and backflow pressures can be accommodated. Low cracking pressures such as 0.1psi are achievable.

When the check valve is fully open, flow in one direction is relatively unrestricted. When closed the check valve should not exhibit any flow. The key benefit of building a spring into a check valve’s mechanism is that it largely eliminates the effect of gravity on check valve function. Without a spring, gravity and thus the valve’s vertical orientation can become a critical factor for a check valve to work properly.

Modular Red Check Valve, 1/8" Barb Input and Output, Nitrile Seals, 3 psi Cracking Pressure

Modular Red Check Valve, 1/8" Barb Input and Output, Nitrile Seals, 3 psi Cracking Pressure

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Modular Red Check Valve, 1/4" Barb Input and Output, Nitrile Seals, 3 psi Cracking Pressure

Modular Red Check Valve, 1/4" Barb Input and Output, Nitrile Seals, 3 psi Cracking Pressure

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Modular Red Check Valve, 5/16" Barb Input and Output, Nitrile Seals, 3 psi Cracking Pressure

Modular Red Check Valve, 5/16" Barb Input and Output, Nitrile Seals, 3 psi Cracking Pressure

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Modular Red Check Valve, 3/8" Barb Input and Output, Nitrile Seals, 3 psi Cracking Pressure

Modular Red Check Valve, 3/8" Barb Input and Output, Nitrile Seals, 3 psi Cracking Pressure

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Modular Blue Check Valve, 4mm OD Tube Push-in Input and Output, Nitrile Seals, 3 psi Cracking Pressure

Modular Blue Check Valve, 4mm OD Tube Push-in Input and Output, Nitrile Seals, 3 psi Cracking Pressure

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Modular Red Check Valve, 1/4" OD Tube Push-in Input and Output, Nitrile Seals, 3 psi Cracking Pressure

Modular Red Check Valve, 1/4" OD Tube Push-in Input and Output, Nitrile Seals, 3 psi Cracking Pressure

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Modular Blue Check Valve, 6mm OD Tube Push-in Input and Output, Nitrile Seals, 3 psi Cracking Pressure

Modular Blue Check Valve, 6mm OD Tube Push-in Input and Output, Nitrile Seals, 3 psi Cracking Pressure

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Modular Red Check Valve, 1/8" BSPP Female Input and Output, Nitrile Seals, 3 psi Cracking Pressure

Modular Red Check Valve, 1/8" BSPP Female Input and Output, Nitrile Seals, 3 psi Cracking Pressure

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1/4" White Polypropylene Swivel Ball Check Valves - Various Cracking Pressures

1/4" White Polypropylene Swivel Ball Check Valves - Various Cracking Pressures

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Multiple options available

1/16" White Polypropylene Swivel Ball Check Valves - Various Cracking Pressures

1/16" White Polypropylene Swivel Ball Check Valves - Various Cracking Pressures

View Details

Multiple options available

1/8" White Polypropylene Swivel Ball Check Valves - Various Cracking Pressures

1/8" White Polypropylene Swivel Ball Check Valves - Various Cracking Pressures

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Multiple options available

5/8" OD Cartridge for Modular Check Valve, Polypropylene, Nitrile Seals, 3 psi Cracking Pressure

5/8" OD Cartridge for Modular Check Valve, Polypropylene, Nitrile Seals, 3 psi Cracking Pressure

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Nickel Plated Brass Check Valves, Buna-N Seal - 1.45 Cracking Pressure

Nickel Plated Brass Check Valves, Buna-N Seal - 1.45 Cracking Pressure

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Multiple options available

Black Polysulfone Check Valve

Black Polysulfone Check Valve

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Multiple options available

1/4" OD Cartridge Check Valve, Nylon Body, Buna-N seal, 1 psi Cracking Pressure

1/4" OD Cartridge Check Valve, Nylon Body, Buna-N seal, 1 psi Cracking Pressure

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Nickel Plated Brass Bodied Check Valves with Viton Seal

Nickel Plated Brass Bodied Check Valves with Viton Seal

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Multiple options available

Polypropylene Bodied Check Valves with EPDM or Viton Seals

Polypropylene Bodied Check Valves with EPDM or Viton Seals

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Multiple options available

PVDF (Kynar®) Bodied Check Valves with EPDM or Viton Seals

PVDF (Kynar®) Bodied Check Valves with EPDM or Viton Seals

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Multiple options available

1/4" OD Cartridge Check Valve, Nylon Body, Buna-N seal, 0.5 psi Cracking Pressure

1/4" OD Cartridge Check Valve, Nylon Body, Buna-N seal, 0.5 psi Cracking Pressure

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Plastic Bodied Check Valves with Buna-N Seal

Plastic Bodied Check Valves with Buna-N Seal

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Multiple options available

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