Pneumatic Positive Pressure & Vacuum Non Return Valve Function Fittings

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. 445-3098
Fabrikantnummer7995 06 10
FabrikantLegris
€ 13,87
Each
Aantal stuks
7995 Threaded R 1/8 Male - Tube - 6mm - Male 1bar 10 bar +70°C - 1/8 in
RS-stocknr. 619-0935
Fabrikantnummer7996 12 00
FabrikantLegris
€ 34,68
Each
Aantal stuks
7996 Tube - 12mm Tube - 12mm - - 1bar 10 bar +70°C - -
RS-stocknr. 384-7666
FabrikantnummerT55C2800RS
FabrikantNorgren
€ 30,34
Each
Aantal stuks
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-stocknr. 916-0946
FabrikantRS PRO
€ 12,93
Each
Aantal stuks
CVPU Tube - 8mm Tube - 8mm - - -1bar 10 bar +60°C - -
RS-stocknr. 290-3686
FabrikantnummerT50P0008
FabrikantNorgren
€ 25,42
Each
Aantal stuks
T50P Tube - 8mm Tube - 8mm 0.03bar - -0.9bar 16 bar +80°C - -
RS-stocknr. 290-3664
FabrikantnummerT50P0004
FabrikantNorgren
€ 20,29
Each
Aantal stuks
T50P Tube - 4mm Tube - 4mm 0.03bar - -0.9bar 16 bar +80°C - -
RS-stocknr. 916-0934
FabrikantRS PRO
€ 6,40
Each
Aantal stuks
CVPU Tube - 4mm Tube - 4mm - - -1bar 10 bar +60°C - -
RS-stocknr. 916-0940
FabrikantRS PRO
€ 16,35
Each
Aantal stuks
CVPU Tube - 10mm Tube - 10mm - - -1bar 10 bar +60°C - -
RS-stocknr. 826-8116
FabrikantnummerAKH04B-01S
FabrikantSMC
€ 8,83
Each
Aantal stuks
AKH Tube - 4mm Threaded R 1/8 Male - 0.005MPa - -100kPa 1 (Operating) MPa, 1.5 (Proof) MPa +60°C Male -
RS-stocknr. 619-0929
Fabrikantnummer7996 10 00
FabrikantLegris
€ 24,84
Each
Aantal stuks
7996 Tube - 10mm Tube - 10mm - - 1bar 10 bar +70°C - -
RS-stocknr. 202-3609
FabrikantnummerH-QS-4
FabrikantFesto
€ 18,43
Each
Aantal stuks
H Tube - 4mm Tube - 4mm - - - - - - -
RS-stocknr. 249-5882
FabrikantnummerAK2000-02-X209
FabrikantSMC
€ 26,47
Each
Aantal stuks
AK Threaded Rc 1/4 Female - - - - 0.02MPa Female 0.02MPa 1 MPa +60°C - 1/4 in
RS-stocknr. 144-2694
FabrikantRS PRO
€ 4,66
1 Bag of 1
Bag(s)
- Threaded - - - - 6mm - Male 0 kgf/cm², 0 kPa 9.9 kgf/cm², 990 kPa +60°C - 1/8 in
RS-stocknr. 187-9027
FabrikantnummerR412010570
€ 15,39
Each
Aantal stuks
CC04 - - 8mm Threaded - - 0.5bar - 0.5bar 10 bar +60°C - -
RS-stocknr. 204-0035
FabrikantnummerISV-M10
FabrikantFesto
€ 28,49
Each
Aantal stuks
ISV Threaded - 10mm Threaded - 10mm - - - - - - -
RS-stocknr. 187-5698
FabrikantRS PRO
€ 234,52
1 Bag of 10
Bag(s)
6063 Threaded 3/8 in Male - Threaded - - - Male 2bar 8 bar +80°C Female 3/8 in
RS-stocknr. 187-5694
FabrikantRS PRO
€ 142,27
1 Bag of 10
Bag(s)
57065 Tube - Push In 12 mm Threaded - - - - 2bar 8 bar +80°C Male -
RS-stocknr. 202-3630
FabrikantnummerHB-3/8-QS-12
FabrikantFesto
€ 50,22
Each
Aantal stuks
HB Tube - 12mm Threaded - - - - - - - - -
RS-stocknr. 202-3614
FabrikantnummerHB-1/8-QS-6
FabrikantFesto
€ 19,44
Each
Aantal stuks
HB Tube - 6mm Threaded - - - - - - - - -
RS-stocknr. 202-3591
FabrikantnummerHGL-1/4-QS-8
FabrikantFesto
€ 46,84
Each
Aantal stuks
HGL Tube - 8mm Threaded - - - - - - - - -