Check Valves

Check valves prevent reverse flow of fluids and gases within a pipeline system. They are designed to allow fluid to flow one way through the pipeline. Due to the simple design, check valves generally operate without automation or human interaction and instead rely on the flow velocity of the fluid to open and close.

How do they work?

Check valves are flow sensitive and rely on the line fluid to open and close. The internal disc allows flow to pass forward, which opens the valve. The disc begins closing the valve as forward flow decreases or is reversed, depends on the design. Construction is normally simple with only a few components such as the body, seat, disc and cover.

Check Valve types

There are several types of check valves for just about any application. Some of the more popular types include:
● Ball
● Dual plate
● Double door
● Spring assisted inline
● Nozzle
● Piston or lift
● swing checks

As with other types of valves, speciality check valves can be found for special applications.


Check valves are found in just about any type of facility from industrial plants and homes.

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Description Price Type Connection Body Material Maximum Working Pressure Thread Size Thread Standard
RS stock no. 794-8356
Mfr. Part No.FLOW230001
R 214.13
Each
units
Double 15 mm BSP Female Brass 10 bar 15mm BSP
RS stock no. 458-6794
Mfr. Part No.4890 17 17
BrandLegris
R 1,646.61
Each
units
Single 3/8 in G Stainless Steel 40 bar 3/8in G
RS stock no. 720-9285
BrandRS PRO
R 1,031.49
Each
units
Single - Stainless Steel - 15mm -
RS stock no. 794-8375
Mfr. Part No.FLOW230006
R 466.46
Each
units
Double 3/4 in BSP Female Brass 10 bar 3/4in BSP
RS stock no. 340-3339
BrandRS PRO
R 697.02
Each
units
Single 1-1/2 in BSP Brass 16 bar 1-1/2in BSP
RS stock no. 486-182
BrandRS PRO
R 1,251.91
Each
units
Single 2 in BSPP Brass 16 bar 2in BSP
RS stock no. 214-0611
Mfr. Part No.161561064
R 1,695.46
Each
units
Single - PVC-U 16 bar 1in -
RS stock no. 794-8388
Mfr. Part No.FLOW235001
R 161.99
Each
units
Single 15 mm BSP Female Brass 10 bar 15mm BSP
RS stock no. 486-211
BrandRS PRO
R 693.68
Each
units
Single 1-1/4 in BSPP Brass 16 bar 1-1/4in BSP
RS stock no. 794-8397
Mfr. Part No.FLOW235002
R 255.12
Each
units
Single 22 mm BSP Female Brass 10 bar 22mm BSP
RS stock no. 284-2727
BrandRS PRO
R 3,286.97
Each
units
Single 1 in BSPT Bronze 25 bar 1in BSPT
RS stock no. 365-6678
Mfr. Part No.293100
R 1,038.65
Each
units
Single 1/2 in BSPP Bronze 14 bar 1/2in BSPP
RS stock no. 499-2638
BrandRS PRO
R 1,061.16
Each
units
Single 3/4 in BSP Stainless Steel 14 bar 3/4in BSP
RS stock no. 794-8410
Mfr. Part No.FLOW235908
R 947.17
Each
units
Single 1-1/2 in BSP Female Brass 10 bar 1-1/2in BSP
RS stock no. 486-164
BrandRS PRO
R 303.30
Each
units
Single 1 in BSPP Brass 12 bar 1in BSPP
RS stock no. 458-6788
Mfr. Part No.4890 13 13
BrandLegris
R 1,291.50
Each
units
Single 1/4 in G Stainless Steel 40 bar 1/4in G
RS stock no. 486-233
BrandRS PRO
R 901.09
Each
units
Single 2 in BSPP Brass 12 bar 2in BSPP
RS stock no. 794-8413
Mfr. Part No.FLOW235909
R 1,217.62
Each
units
Single 2 in BSP Female Brass 10 bar 2in BSP
RS stock no. 365-6707
Mfr. Part No.222300
R 4,141.10
Each
units
Single 1/2 in BSPP Bronze 3.6 bar 1/2in BSPP
RS stock no. 794-8362
Mfr. Part No.FLOW230004
R 693.06
Each
units
Double 28 mm BSP Female Brass 10 bar 28mm BSP