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. 722-564
Mfr. Part No.S/520
BrandNorgren
TWD1,140.00
Each
units
S/520 Threaded G 1/8 Female - Threaded G 1/8 Female - <0.1bar Female 0.3bar 16 bar +80°C Female 1/8 in
RS Stock No. 249-5882
Mfr. Part No.AK2000-02-X209
BrandSMC
TWD1,070.00
Each
units
AK Threaded Rc 1/4 Female - - - - 0.02MPa Female 0.02MPa 1 MPa +60°C - 1/4 in
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. 721-3575
Mfr. Part No.ASR630F-04-12S
BrandSMC
TWD2,059.00
Each
units
ASR Threaded R 1/2 Male - Tube - 12mm - Male - 1 MPa +60°C - 1/2 in
RS Stock No. 144-2696
BrandRS PRO
TWD234.00
1 Bag of 1
Bag(s)
- Threaded - - - - 8mm - Male 0 kgf/cm², 0 kPa 9.9 kgf/cm², 990 kPa +60°C - 1/8in
RS Stock No. 144-2697
BrandRS PRO
TWD234.00
1 Bag of 1
Bag(s)
- Threaded - - - - 8mm - Male 0 kgf/cm², 0 kPa 9.9 kgf/cm², 990 kPa +60°C - 1/4in
RS Stock No. 849-7229
Mfr. Part No.AK4000-N04
BrandSMC
TWD938.00
Each
units
AK Threaded NPT 1/2 Female - Threaded NPT 1/2 Female - 0.02MPa Female 0.02MPa 1 MPa +60°C Female 1/2
RS Stock No. 202-3569
Mfr. Part No.HA-1/4-QS-8
BrandFesto
TWD931.00
Each
units
HA Threaded - - Tube - 8mm - - - - - - -
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. 144-2706
BrandRS PRO
TWD348.00
1 Bag of 1
Bag(s)
- - - - - - - - - - 9.9 kgf/cm², 990 kPa +60°C - -
RS Stock No. 187-5689
BrandRS PRO
TWD3,057.00
1 Bag of 10
Bag(s)
57065 Tube - Push In 6mm Threaded - - - - 2bar 8 bar +80°C Male -
RS Stock No. 144-2702
BrandRS PRO
TWD477.00
1 Bag of 1
Bag(s)
- Tube - 12mm - - 12mm - - 0 kgf/cm², 0kPa 9.9 kgf/cm², 990 kPa +60°C - -
RS Stock No. 290-3692
Mfr. Part No.T50P0010
TWD1,446.00
Each
units
T50P Tube - 10mm Tube - 10mm 0.03bar - -0.9bar 16 bar +80°C - -
RS Stock No. 826-8116
Mfr. Part No.AKH04B-01S
BrandSMC
TWD354.00
Each
units
AKH Tube - 4mm Threaded R 1/8 Male - 0.005MPa - -100kPa 1 MPa, 1.5 MPa +60°C Male -
RS Stock No. 187-5687
BrandRS PRO
TWD2,872.00
1 Bag of 10
Bag(s)
57065 Tube - Push In 4mm Threaded - - - - 2bar 8 bar +80°C Male -
RS Stock No. 202-3578
Mfr. Part No.H-QS-12
BrandFesto
TWD2,397.00
Each
units
H Tube - 12mm Tube - 12mm - - - - - - -
RS Stock No. 202-3564
Mfr. Part No.HA-1/8-QS-6
BrandFesto
TWD779.00
Each
units
HA Threaded - - Tube - 6mm - - - - - - -
RS Stock No. 176-2266
BrandRS PRO
TWD262.90
Each (In a Pack of 10)
units
- - - - - - - - Female 2bar 8 bar +80°C Female 3.175 mm
RS Stock No. 203-8507
Mfr. Part No.H-M5
BrandFesto
TWD946.00
Each
units
H-M5 Threaded M5 5mm Threaded - 5mm - - - - - - -
RS Stock No. 202-3568
Mfr. Part No.HGL-1/8-QS-4
BrandFesto
TWD1,538.00
Each
units
HGL Tube - 4mm Threaded - - - - - - - - -