Pneumatic Non-Return Valves

Pneumatic non-return valves are one of the simplest types of pneumatic valves available. They allow compressed air to flow in one direction and prevent or block it from flowing in the opposite direction. Also known as a check valve these simple but effective devices help to eliminate any potential damage that may be caused by backflow pressure. RS Components offer a range of high-quality valves from leading brands including Festo, SMC, Legris, Norgren and of course RS PRO.

How does a Pneumatic Non-Return Valve Work?

Non-return valves work automatically, which means that most valves don’t need human intervention external control to work. The valves will have two openings or ports, an inlet and an outlet port. An internal spring will lift when the pressure upstream is great enough to overcome the tension of the spring. This is referred to as the ‘cracking pressure’.

What is Cracking Pressure?

Cracking pressure refers to the minimum pressure differential needed between the inlet and outlet of the valve at which the first indication of flow occurs. When cracking pressure is reached, the valve will open to allow flow, when it drops the valve will close.

What are the different types of Pneumatic Non-return valve?

Pneumatic non-return valves are available in two main types. Push in tube-to-tube or Push-in tube to threaded.

Tube-to-Tube Non Return Valves

This type of non-return valve will have a push-in connection port at either end. They are available with different body materials, including brass and aluminium. Hose sizes ranging from 4 mm to 12 mm

Tube to Threaded Non Return Valves

This type of non-return valve will have a tube connection on one end and a threaded connection on the other. They are available with different body materials including brass and aluminium. Hose sizes ranging from 4 mm to 12 mm. Threads are typically BSPP (G), BSPT (R), NPT, and Metric.


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Description Price Manufacturer Series Inlet Connection Type Threaded Inlet Connection Tube Inlet Connection Outlet Connection Type Threaded Outlet Connection Tube Outlet Connection Cracking Pressure Threaded Inlet Gender Minimum Operating Pressure Maximum Operating Pressure Maximum Operating Temperature Threaded Outlet Gender Threaded Inlet Thread Size
RS Stock No. 189-2816
Mfr. Part No.7996 04 00
BrandLegris
TWD472.00
Each
units
7996 Tube - 4mm Tube - 4mm 0.3bar - 1bar 10 bar +70°C - -
RS Stock No. 445-3149
Mfr. Part No.7985 08 13
BrandLegris
TWD552.00
Each
units
7985 Tube - 8mm Threaded R 1/4 Male - - - 1bar 10 bar +70°C Male -
RS Stock No. 619-0935
Mfr. Part No.7996 12 00
BrandLegris
TWD1,178.00
Each
units
7996 Tube - 12mm Tube - 12mm - - 1bar 10 bar +70°C - -
RS Stock No. 445-3111
Mfr. Part No.7995 08 13
BrandLegris
TWD552.00
Each
units
7995 Threaded R 1/4 Male - Tube - 8mm - Male 1bar 10 bar +70°C - 1/4 in
RS Stock No. 445-3098
Mfr. Part No.7995 06 10
BrandLegris
TWD471.00
Each
units
7995 Threaded R 1/8 Male - Tube - 6mm - Male 1bar 10 bar +70°C - 1/8 in
RS Stock No. 445-3105
Mfr. Part No.7995 06 13
BrandLegris
TWD491.00
Each
units
7995 Threaded R 1/4 Male - Tube - 6mm - Male 1bar 10 bar +70°C - 1/4 in
RS Stock No. 445-3127
Mfr. Part No.7985 06 10
BrandLegris
TWD471.00
Each
units
7985 Tube - 6mm Threaded R 1/8 Male - - - 1bar 10 bar +70°C Male -
RS Stock No. 189-2838
Mfr. Part No.7996 06 00
BrandLegris
TWD505.00
Each
units
7996 Tube - 6mm Tube - 6mm - - 1bar 10 bar +70°C - -
RS Stock No. 619-0929
Mfr. Part No.7996 10 00
BrandLegris
TWD844.00
Each
units
7996 Tube - 10mm Tube - 10mm - - 1bar 10 bar +70°C - -
RS Stock No. 445-3133
Mfr. Part No.7985 06 13
BrandLegris
TWD491.00
Each
units
7985 Tube - 6mm Threaded R 1/4 Male - - - 1bar 10 bar +70°C Male -
RS Stock No. 189-2844
Mfr. Part No.7996 08 00
BrandLegris
TWD568.00
Each
units
7996 Tube - 8mm Tube - 8mm - - 1bar 10 bar +70°C - -