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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Omschrijving Prijs 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-stocknr. 203-8494
FabrikantnummerHB-1/4-QS-8
FabrikantFesto
23,23 €
Each
Aantal stuks
HB-1/4-QS-8 Threaded - 8mm Threaded - R1/4 - - - - - - -
RS-stocknr. 203-8495
FabrikantnummerHB-1/8-QS-8
FabrikantFesto
21,65 €
Each
Aantal stuks
HB-1/8-QS-8 Threaded - 8mm Threaded - R1/8 - - - - - - -
RS-stocknr. 202-3592
FabrikantnummerHGL-3/8-QS-8
FabrikantFesto
55,80 €
Each
Aantal stuks
HGL Tube - 8mm Threaded - - - - - - - - -
RS-stocknr. 204-0032
FabrikantnummerISV-1/4
FabrikantFesto
27,67 €
Each
Aantal stuks
ISV Threaded - 4mm Threaded G 1/4 Female 4mm - - - - - - -
RS-stocknr. 202-3630
FabrikantnummerHB-3/8-QS-12
FabrikantFesto
50,22 €
Each
Aantal stuks
HB Tube - 12mm Threaded - - - - - - - - -
RS-stocknr. 203-8504
FabrikantnummerHB-1/2-QS-12
FabrikantFesto
51,53 €
Each
Aantal stuks
HB-1/2-QS-12 Threaded - 12mm Threaded - R1/2 - - - - - - -
RS-stocknr. 202-3590
FabrikantnummerHAB-1/8
FabrikantFesto
19,32 €
Each
Aantal stuks
B Threaded - - Threaded - - - - - - - - -
RS-stocknr. 202-3582
FabrikantnummerH-1/2-B
FabrikantFesto
49,63 €
Each
Aantal stuks
B Threaded - - Threaded - - - - - - - - -
RS-stocknr. 203-8525
FabrikantnummerHA-M5-QS-4
FabrikantFesto
17,16 €
Each
Aantal stuks
HA-M5-QS-4 Threaded M5 5mm Threaded - 4mm - - - - - - -
RS-stocknr. 202-3560
FabrikantnummerHGL-1/4-QS-10
FabrikantFesto
46,84 €
Each
Aantal stuks
HGL Tube - 10mm Threaded - - - - - - - - -
RS-stocknr. 202-3546
FabrikantnummerH-1/8-A/I
FabrikantFesto
26,77 €
Each
Aantal stuks
H Threaded - - Threaded - - - - - - - - -
RS-stocknr. 202-3568
FabrikantnummerHGL-1/8-QS-4
FabrikantFesto
38,38 €
Each
Aantal stuks
HGL Tube - 4mm Threaded - - - - - - - - -
RS-stocknr. 202-3629
FabrikantnummerHA-3/8-QS-10
FabrikantFesto
48,32 €
Each
Aantal stuks
HA Threaded - - Tube - 10mm - - - - - - -
RS-stocknr. 202-3565
FabrikantnummerHA-3/8-QS-12
FabrikantFesto
50,22 €
Each
Aantal stuks
HA Threaded - - Tube - 12mm - - - - - - -
RS-stocknr. 203-8549
FabrikantnummerHB-M5-QS-4
FabrikantFesto
17,16 €
Each
Aantal stuks
HB-M5-QS-4 Threaded M5 4mm Threaded - 5mm - - - - - - -
RS-stocknr. 204-0033
FabrikantnummerISV-1/8
FabrikantFesto
24,91 €
Each
Aantal stuks
ISV Threaded - 8mm Threaded - 8mm - - - - - - -
RS-stocknr. 203-8519
FabrikantnummerHB-3/8-QS-10
FabrikantFesto
48,32 €
Each
Aantal stuks
HB-3/8-QS-10 Threaded - 10mm Threaded - R3/8 - - - - - - -
RS-stocknr. 202-3743
FabrikantnummerH-3/8-B
FabrikantFesto
36,76 €
Each
Aantal stuks
B Threaded - - Threaded - - - - - - - - -
RS-stocknr. 202-3558
FabrikantnummerHA-1/8-QS-8
FabrikantFesto
21,65 €
Each
Aantal stuks
HA Threaded - - Tube - 8mm - - - - - - -
RS-stocknr. 202-3578
FabrikantnummerH-QS-12
FabrikantFesto
59,81 €
Each
Aantal stuks
H Tube - 12mm Tube - 12mm - - - - - - -