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. 202-3606
Mfr. Part No.HGL-3/8-QS-10
BrandFesto
€55.80
Each
units
HGL Tube - 10mm Threaded - - - - - - - - -
RS Stock No. 203-8503
Mfr. Part No.HGL-1/2-QS-12
BrandFesto
€63.76
Each
units
HGL-1/2-QS-12 Threaded - 12mm Threaded - G1/2 - - - - - - -
RS Stock No. 202-3551
Mfr. Part No.HA-1/8-QS-4
BrandFesto
€18.43
Each
units
HA Threaded - - Tube - 4mm - - - - - - -
RS Stock No. 203-8537
Mfr. Part No.HB-1/8-QS-4
BrandFesto
€18.43
Each
units
HB-1/8-QS-4 Threaded - 4mm Threaded - R1/8 - - - - - - -
RS Stock No. 203-8504
Mfr. Part No.HB-1/2-QS-12
BrandFesto
€51.53
Each
units
HB-1/2-QS-12 Threaded - 12mm Threaded - R1/2 - - - - - - -
RS Stock No. 202-3578
Mfr. Part No.H-QS-12
BrandFesto
€59.81
Each
units
H Tube - 12mm Tube - 12mm - - - - - - -
RS Stock No. 202-3590
Mfr. Part No.HAB-1/8
BrandFesto
€19.32
Each
units
B Threaded - - Threaded - - - - - - - - -
RS Stock No. 202-3609
Mfr. Part No.H-QS-4
BrandFesto
€18.43
Each
units
H Tube - 4mm Tube - 4mm - - - - - - -
RS Stock No. 204-0039
Mfr. Part No.ISV-M6
BrandFesto
€25.73
Each
units
ISV Threaded - 6mm Threaded - 6mm - - - - - - -
RS Stock No. 202-3564
Mfr. Part No.HA-1/8-QS-6
BrandFesto
€19.44
Each
units
HA Threaded - - Tube - 6mm - - - - - - -
RS Stock No. 202-3558
Mfr. Part No.HA-1/8-QS-8
BrandFesto
€21.65
Each
units
HA Threaded - - Tube - 8mm - - - - - - -
RS Stock No. 202-3591
Mfr. Part No.HGL-1/4-QS-8
BrandFesto
€46.84
Each
units
HGL Tube - 8mm Threaded - - - - - - - - -
RS Stock No. 202-3552
Mfr. Part No.HAB-3/8
BrandFesto
€21.97
Each
units
B Threaded - - Threaded - - - - - - - - -
RS Stock No. 202-3592
Mfr. Part No.HGL-3/8-QS-8
BrandFesto
€55.80
Each
units
HGL Tube - 8mm Threaded - - - - - - - - -
RS Stock No. 202-3568
Mfr. Part No.HGL-1/8-QS-4
BrandFesto
€38.38
Each
units
HGL Tube - 4mm Threaded - - - - - - - - -
RS Stock No. 202-3614
Mfr. Part No.HB-1/8-QS-6
BrandFesto
€19.44
Each
units
HB Tube - 6mm Threaded - - - - - - - - -
RS Stock No. 204-0032
Mfr. Part No.ISV-1/4
BrandFesto
€27.67
Each
units
ISV Threaded - 4mm Threaded G 1/4 Female 4mm - - - - - - -
RS Stock No. 202-3586
Mfr. Part No.HA-1/2-QS-12
BrandFesto
€51.53
Each
units
HA Threaded - - Tube - 12mm - - - - - - -
RS Stock No. 204-0037
Mfr. Part No.ISV-M5
BrandFesto
€16.21
Each
units
ISV Threaded M5 5mm Threaded M5 Female 5mm - - - - - - -
RS Stock No. 203-8549
Mfr. Part No.HB-M5-QS-4
BrandFesto
€17.16
Each
units
HB-M5-QS-4 Threaded M5 4mm Threaded - 5mm - - - - - - -