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. 722-570
Mfr. Part No.S/521
BrandNorgren
MYR247.20
Each
units
S/520 Threaded G 1/4 Female - Threaded G 1/4 Female - <0.1bar Female 0.3bar 16 bar +80°C Female 1/4 in
RS Stock No. 762-1398
Mfr. Part No.AC-VP
BrandMetcal
MYR59.98
Each
units
- - - - - - - - - - - - - -
RS Stock No. 849-7231
Mfr. Part No.AKB02B-N02S
BrandSMC
MYR83.07
Each
units
AKB Threaded NPT 1/4 Female - Threaded NPT 1/4 Female - 0.005MPa Female -100kPa 1 MPa +60°C Female 1/4
RS Stock No. 367-0624
Mfr. Part No.AKH06-00
BrandSMC
MYR49.77
Each
units
AKH Tube - 6mm Tube - 6mm 0.005MPa - -100kPa 1 MPa +60°C - -
RS Stock No. 367-0646
Mfr. Part No.AKH10-00
BrandSMC
MYR114.94
Each
units
AKH Tube - 10mm Tube - 10mm 0.005MPa - -100kPa 1 MPa +60°C - -
RS Stock No. 290-3686
Mfr. Part No.T50P0008
BrandNorgren
MYR204.38
Each
units
T50P Tube - 8mm Tube - 8mm 0.03bar - -0.9bar 16 bar +80°C - -
RS Stock No. 826-8112
Mfr. Part No.AKH04A-M5
BrandSMC
MYR52.51
Each
units
AKH Tube - 4mm Threaded M5 x 0.8 Male - 0.005MPa - -100kPa 1 MPa, 1.5 MPa +60°C Male -
RS Stock No. 721-3575
Mfr. Part No.ASR630F-04-12S
BrandSMC
MYR325.53
Each
units
ASR Threaded R 1/2 Male - Tube - 12mm - Male - 1 MPa +60°C - 1/2 in
RS Stock No. 189-2816
Mfr. Part No.7996 04 00
BrandLegris
MYR74.63
Each
units
7996 Tube - 4mm Tube - 4mm 0.3bar - 1bar 10 bar +70°C - -
RS Stock No. 367-0618
Mfr. Part No.AKH04-00
BrandSMC
MYR48.50
Each
units
AKH Tube - 4mm Tube - 4mm 0.005MPa - -100kPa 1 MPa +60°C - -
RS Stock No. 722-564
Mfr. Part No.S/520
BrandNorgren
MYR178.03
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. 849-7238
Mfr. Part No.AKB01B-N01S
BrandSMC
MYR63.73
Each
units
AKB Threaded NPT 1/8 Male - Threaded NPT 1/8 Female - 0.005MPa Female -100kPa 1 MPa +60°C Female 1/8
RS Stock No. 826-8116
Mfr. Part No.AKH04B-01S
BrandSMC
MYR56.03
Each
units
AKH Tube - 4mm Threaded R 1/8 Male - 0.005MPa - -100kPa 1 MPa, 1.5 MPa +60°C Male -
RS Stock No. 290-3670
Mfr. Part No.T50P0006
BrandNorgren
MYR175.90
Each
units
T50P Tube - 6mm Tube - 6mm 0.03bar - -0.9bar 16 bar +80°C - -
RS Stock No. 826-8140
Mfr. Part No.AKH11A-N04S
BrandSMC
MYR153.63
Each
units
AKH Tube - 3/8in Threaded NPT 1/2 Male - 0.005MPa - -100kPa 1 MPa, 1.5 MPa +60°C Male -
RS Stock No. 189-2838
Mfr. Part No.7996 06 00
BrandLegris
MYR79.76
Each
units
7996 Tube - 6mm Tube - 6mm - - 1bar 10 bar +70°C - -
RS Stock No. 290-3692
Mfr. Part No.T50P0010
MYR228.59
Each
units
T50P Tube - 10mm Tube - 10mm 0.03bar - -0.9bar 16 bar +80°C - -
RS Stock No. 384-7666
Mfr. Part No.T55C2800RS
BrandNorgren
MYR197.97
Each
units
T55 Threaded G 1/4 Female - Threaded G 1/4 Female - 0.05bar Female 0.1bar 10 bar +80°C Female 1/4 in
RS Stock No. 249-5882
Mfr. Part No.AK2000-02-X209
BrandSMC
MYR169.10
Each
units
AK Threaded Rc 1/4 Female - - - - 0.02MPa Female 0.02MPa 1 MPa +60°C - 1/4 in
RS Stock No. 290-3664
Mfr. Part No.T50P0004
BrandNorgren
MYR151.68
Each
units
T50P Tube - 4mm Tube - 4mm 0.03bar - -0.9bar 16 bar +80°C - -