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. 722-570
Mfr. Part No.S/521
BrandNorgren
PHP2,696.82
Each
units
S/520 Threaded G 1/4 Female - Threaded G 1/4 Female - <0.1bar Female 0.3bar 16 bar +80°C Female 1/4 in
RS Stock No. 703-6251
Mfr. Part No.0821200005
PHP2,740.79
Each
units
CC01 Threaded G 1/4 Female - Threaded G 1/4 Female - - Female 0.5bar 10 bar +80°C Female 1/4 in
RS Stock No. 826-8116
Mfr. Part No.AKH04B-01S
BrandSMC
PHP621.08
Each
units
AKH Tube - 4mm Threaded R 1/8 Male - 0.005MPa - -100kPa 1 MPa, 1.5 MPa +60°C Male -
RS Stock No. 849-7225
Mfr. Part No.AK2000-N02
BrandSMC
PHP1,360.96
Each
units
AK Threaded NPT 1/4 Female - Threaded NPT 1/4 Female - 0.02MPa Female 0.02MPa 1 MPa +60°C Female 1/4
RS Stock No. 367-0652
Mfr. Part No.AKH12-00
BrandSMC
PHP1,730.10
Each
units
AKH Tube - 12mm Tube - 12mm 0.005MPa - -100kPa 1 MPa +60°C - -
RS Stock No. 189-2838
Mfr. Part No.7996 06 00
BrandLegris
PHP980.73
Each
units
7996 Tube - 6mm Tube - 6mm - - 1bar 10 bar +70°C - -
RS Stock No. 445-3111
Mfr. Part No.7995 08 13
BrandLegris
PHP967.79
Each
units
7995 Threaded R 1/4 Male - Tube - 8mm - Male 1bar 10 bar +70°C - 1/4 in
RS Stock No. 721-3575
Mfr. Part No.ASR630F-04-12S
BrandSMC
PHP3,608.48
Each
units
ASR Threaded R 1/2 Male - Tube - 12mm - Male - 1 MPa +60°C - 1/2 in
RS Stock No. 367-0646
Mfr. Part No.AKH10-00
BrandSMC
PHP1,274.05
Each
units
AKH Tube - 10mm Tube - 10mm 0.005MPa - -100kPa 1 MPa +60°C - -
RS Stock No. 762-1398
Mfr. Part No.AC-VP
BrandMetcal
PHP932.61
Each
units
- - - - - - - - - - - - - -
RS Stock No. 849-7229
Mfr. Part No.AK4000-N04
BrandSMC
PHP1,643.99
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. 916-0934
BrandRS PRO
PHP325.23
Each
units
CVPU Tube - 4mm Tube - 4mm - - 0bar 10 bar +60°C - -
RS Stock No. 367-0624
Mfr. Part No.AKH06-00
BrandSMC
PHP678.14
Each
units
AKH Tube - 6mm Tube - 6mm 0.005MPa - -100kPa 1 MPa +60°C - -
RS Stock No. 826-8128
Mfr. Part No.AKH07-00
BrandSMC
PHP648.19
Each
units
AKH Tube - 1/4in Tube - 1/4in 0.005MPa - -100kPa 1 MPa, 1.5 MPa +60°C - -
RS Stock No. 202-3569
Mfr. Part No.HA-1/4-QS-8
BrandFesto
PHP1,605.29
Each
units
HA Threaded - - Tube - 8mm - - - - - - -
New
RS Stock No. 220-3541
Mfr. Part No.C00GL0400
PHP1,528.31
Each
units
C00GL Tube - 4mm Tube - 10.5mm - - - - - - -
RS Stock No. 179-5283
Mfr. Part No.R412010569
PHP1,061.60
Each
units
CC04 Threaded - - Tube - 6mm 0.5bar Male 0.5bar 10 bar +60°C - 1/8
RS Stock No. 202-3559
Mfr. Part No.HAB-1/2
BrandFesto
PHP1,727.61
Each
units
B Threaded - - Threaded - - - - - - - - -
RS Stock No. 619-0929
Mfr. Part No.7996 10 00
BrandLegris
PHP1,478.52
Each
units
7996 Tube - 10mm Tube - 10mm - - 1bar 10 bar +70°C - -
RS Stock No. 202-3578
Mfr. Part No.H-QS-12
BrandFesto
PHP4,133.13
Each
units
H Tube - 12mm Tube - 12mm - - - - - - -