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. 445-3133
Mfr. Part No.7985 06 13
BrandLegris
HK$134.88
Each
units
7985 Tube - 6mm Threaded R 1/4 Male - - - 1bar 10 bar +70°C Male -
RS Stock No. 619-0935
Mfr. Part No.7996 12 00
BrandLegris
HK$318.80
Each
units
7996 Tube - 12mm Tube - 12mm - - 1bar 10 bar +70°C - -
RS Stock No. 290-3686
Mfr. Part No.T50P0008
BrandNorgren
HK$352.85
Each
units
T50P Tube - 8mm Tube - 8mm 0.03bar - -0.9bar 16 bar +80°C - -
RS Stock No. 849-7229
Mfr. Part No.AK4000-N04
BrandSMC
HK$256.05
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. 290-3664
Mfr. Part No.T50P0004
BrandNorgren
HK$261.87
Each
units
T50P Tube - 4mm Tube - 4mm 0.03bar - -0.9bar 16 bar +80°C - -
RS Stock No. 144-2694
BrandRS PRO
HK$46.34
1 Bag of 1
Bag(s)
- Threaded - - - - 6mm - Male 0 kgf/cm², 0kPa 9.9 kgf/cm², 990 kPa +60°C - 1/8in
RS Stock No. 202-3558
Mfr. Part No.HA-1/8-QS-8
BrandFesto
HK$232.58
Each
units
HA Threaded - - Tube - 8mm - - - - - - -
RS Stock No. 203-8549
Mfr. Part No.HB-M5-QS-4
BrandFesto
HK$184.35
Each
units
HB-M5-QS-4 Threaded M5 4mm Threaded - 5mm - - - - - - -
RS Stock No. 144-2695
BrandRS PRO
HK$59.51
1 Bag of 1
Bag(s)
- Threaded - - - - 6mm - Male 0 kgf/cm², 0kPa 9.9 kgf/cm², 990 kPa +60°C - 1/4in
RS Stock No. 187-5694
BrandRS PRO
HK$1,334.57
1 Bag of 10
Bag(s)
57065 Tube - Push In 12mm Threaded - - - - 2bar 8 bar +80°C Male -
RS Stock No. 202-3614
Mfr. Part No.HB-1/8-QS-6
BrandFesto
HK$211.87
Each
units
HB Tube - 6mm Threaded - - - - - - - - -
RS Stock No. 144-2696
BrandRS PRO
HK$63.94
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. 187-5690
BrandRS PRO
HK$816.85
1 Bag of 10
Bag(s)
57065 Tube - Push In 8mm Threaded - - - - 2bar 8 bar +80°C Male -
RS Stock No. 144-2704
BrandRS PRO
HK$46.34
1 Bag of 1
Bag(s)
- - - - - - - - - - 9.9 kgf/cm², 990 kPa +60°C - -
RS Stock No. 203-8515
Mfr. Part No.HB-1/4-QS-6
BrandFesto
HK$226.26
Each
units
HB-1/4-QS-6 Threaded - 6mm Threaded - R1/4 - - - - - - -
RS Stock No. 187-5697
BrandRS PRO
HK$1,018.71
1 Bag of 10
Bag(s)
6063 Threaded 1/4 in Male - Threaded - - - Male 2bar 8 bar +80°C Female 1/4in
RS Stock No. 144-2700
BrandRS PRO
HK$139.03
1 Bag of 1
Bag(s)
- Threaded - - - - 12mm - Male 0 kgf/cm², 0kPa 9.9 kgf/cm², 990 kPa +60°C - 3/8in
RS Stock No. 203-8504
Mfr. Part No.HB-1/2-QS-12
BrandFesto
HK$553.58
Each
units
HB-1/2-QS-12 Threaded - 12mm Threaded - R1/2 - - - - - - -
RS Stock No. 367-0624
Mfr. Part No.AKH06-00
BrandSMC
HK$88.53
Each
units
AKH Tube - 6mm Tube - 6mm 0.005MPa - -100kPa 1 MPa +60°C - -
RS Stock No. 445-3098
Mfr. Part No.7995 06 10
BrandLegris
HK$127.52
Each
units
7995 Threaded R 1/8 Male - Tube - 6mm - Male 1bar 10 bar +70°C - 1/8 in