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. 916-0934
BrandRS PRO
$8.88
Each
units
CVPU Tube - 4mm Tube - 4mm - - 0bar 10 bar +60°C - -
RS Stock No. 916-0943
BrandRS PRO
$14.08
Each
units
CVPU Tube - 6mm Tube - 6mm - - 0bar 10 bar +60°C - -
RS Stock No. 187-5688
BrandRS PRO
$146.79
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
$25.88
1 Bag of 1
Bag(s)
- Tube - 12mm - - 12mm - - 0 kgf/cm², 0kPa 9.9 kgf/cm², 990 kPa +60°C - -
RS Stock No. 144-2697
BrandRS PRO
$12.68
1 Bag of 1
Bag(s)
- Threaded - - - - 8mm - Male 0 kPa, 0 kgf/cm² 9.9 kgf/cm², 990 kPa +60°C - 1/4in
RS Stock No. 187-5698
BrandRS PRO
$417.49
1 Bag of 10
Bag(s)
6063 Threaded 3/8 in Male - Threaded - - - Male 2bar 8 bar +80°C Female 3/8in
RS Stock No. 187-5696
BrandRS PRO
$158.77
1 Bag of 10
Bag(s)
6063 Threaded 1/8 in Male - Threaded - - - Male 2bar 8 bar +80°C Female 1/8in
RS Stock No. 187-5689
BrandRS PRO
$157.30
1 Bag of 10
Bag(s)
57065 Tube - Push In 6mm Threaded - - - - 2bar 8 bar +80°C Male -
RS Stock No. 144-2693
BrandRS PRO
$7.49
1 Bag of 1
Bag(s)
- Threaded - - - - 4mm - Male 0 kgf/cm², 0kPa 9.9 kgf/cm², 990 kPa +60°C - 1/8in
RS Stock No. 176-2267
BrandRS PRO
$16.483
Each (In a Pack of 10)
units
- - - - - - - - Female 2bar 8 bar +80°C Female 6.35 mm
RS Stock No. 187-5691
BrandRS PRO
$162.73
1 Bag of 10
Bag(s)
57065 Tube - Push In 8mm Threaded - - - - 2bar 8 bar +80°C Male -
RS Stock No. 916-0946
BrandRS PRO
$16.55
Each
units
CVPU Tube - 8mm Tube - 8mm - - 0bar 10 bar +60°C - -
RS Stock No. 144-2703
BrandRS PRO
$6.57
1 Bag of 1
Bag(s)
- - - - - - - - - - 9.9 kgf/cm², 990 kPa +60°C - -
RS Stock No. 187-5697
BrandRS PRO
$195.03
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. 176-2272
BrandRS PRO
$22.297
Each (In a Pack of 10)
units
- - - Push In 8mm - - Push In 8mm - - 2bar 8 bar +80°C - -
RS Stock No. 187-5693
BrandRS PRO
$206.05
1 Bag of 10
Bag(s)
57065 Tube - Push In 10mm Threaded - - - - 2bar 8 bar +80°C Male -
RS Stock No. 176-2268
BrandRS PRO
$36.251
Each (In a Pack of 10)
units
- - - - - - - - Female 2bar 8 bar +80°C Female 9.525 mm
RS Stock No. 144-2695
BrandRS PRO
$10.44
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. 144-2698
BrandRS PRO
$20.14
1 Bag of 1
Bag(s)
- Threaded - - - - 10mm - Male 0 kPa, 0 kgf/cm² 9.9 kgf/cm², 990 kPa +60°C - 1/4in
RS Stock No. 176-2269
BrandRS PRO
$37.246
Each (In a Pack of 10)
units
- - - - - - - - Female 2bar 8 bar +80°C Female 12.7 mm