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. 720-9291
BrandRS PRO
MYR477.87
Each
units
Single - Stainless Steel - 32mm -
RS Stock No. 499-2666
BrandRS PRO
MYR452.23
Each
units
Single 1-1/4 in BSP Stainless Steel 14 bar 1-1/4in BSP
RS Stock No. 499-2650
BrandRS PRO
MYR334.14
Each
units
Single 1 in BSP Stainless Steel 14 bar 1in BSP
RS Stock No. 486-215
BrandRS PRO
MYR60.94
Each
units
Single 3/4 in BSPP Brass 16 bar 3/4in BSP
RS Stock No. 458-6788
Mfr. Part No.4890 13 13
BrandLegris
MYR377.32
Each
units
Single 1/4 in G Stainless Steel 40 bar 1/4in G
RS Stock No. 367-9441
Mfr. Part No.222000
MYR692.50
Each
units
Sight Glass 1/2 in BSPP Brass 3.5 bar 1/2in BSPP
RS Stock No. 214-0605
Mfr. Part No.161561063
MYR447.56
Each
units
Single 3/4 in Socket PVC-U 16 bar 3/4in -
RS Stock No. 214-0627
Mfr. Part No.161561065
MYR543.84
Each
units
Single - PVC-U 16 bar 1 1/4in -
RS Stock No. 794-8356
Mfr. Part No.FLOW230001
MYR48.05
Each
units
Double 15 mm BSP Female Brass 10 bar 15mm BSP
RS Stock No. 896-8355
Mfr. Part No.1/4SCV
BrandJohn Guest
MYR352.81
1 Bag of 10
Bag(s)
Single 1/4 in Push Fit Acetal Copolymer 10 bar - -
RS Stock No. 794-8388
Mfr. Part No.FLOW235001
MYR36.20
Each
units
Single 15 mm BSP Female Brass 10 bar 15mm BSP
RS Stock No. 214-0611
Mfr. Part No.161561064
MYR433.43
Each
units
Single - PVC-U 16 bar 1in -
RS Stock No. 365-6707
Mfr. Part No.222300
MYR1,127.91
Each
units
Single 1/2 in BSPP Bronze 3.6 bar 1/2in BSPP
RS Stock No. 214-0649
Mfr. Part No.161561066
MYR662.92
Each
units
Single - PVC-U 16 bar - -
RS Stock No. 794-8394
Mfr. Part No.FLOW235004
MYR50.75
Each
units
Single 1/2 in BSP Female Brass 10 bar 1/2in BSP
RS Stock No. 917-1943
Mfr. Part No.445786
MYR484.16
Each
units
Sight Glass 3/4 in Rp Female Brass 12 bar 3/4in BSP
RS Stock No. 458-6801
Mfr. Part No.4890 21 21
BrandLegris
MYR494.19
Each
units
Single 1/2 in G Stainless Steel 40 bar 1/2in G
RS Stock No. 794-8381
Mfr. Part No.FLOW230009
MYR448.47
Each
units
Double 1-1/2 in BSP Female Brass 10 bar 1-1/2in BSP
RS Stock No. 794-8404
Mfr. Part No.FLOW235005
MYR63.64
Each
units
Single 3/4 in BSP Female Brass 10 bar 3/4in BSP
RS Stock No. 365-6690
Mfr. Part No.293300
MYR709.46
Each
units
Single 1 in BSPP Bronze 14 bar 1in BSPP