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. 486-170
BrandRS PRO
SGD13.13
Each
units
Single 3/8 in BSPP Brass 12 bar 3/8in BSPP
RS Stock No. 214-0598
Mfr. Part No.161561062
SGD104.48
Each
units
Single - PVC-U 16 bar 1/2in -
RS Stock No. 458-6788
Mfr. Part No.4890 13 13
BrandLegris
SGD111.76
Each
units
Single 1/4 in G Stainless Steel 40 bar 1/4in G
RS Stock No. 499-2622
BrandRS PRO
SGD69.61
Each
units
Single 1/2 in BSP Stainless Steel 14 bar 1/2in BSP
RS Stock No. 214-0611
Mfr. Part No.161561064
SGD133.37
Each
units
Single - PVC-U 16 bar 1in -
RS Stock No. 458-6801
Mfr. Part No.4890 21 21
BrandLegris
SGD151.17
Each
units
Single 1/2 in G Stainless Steel 40 bar 1/2in G
RS Stock No. 486-148
BrandRS PRO
SGD12.59
Each
units
Single 1/2 in BSPP Brass 12 bar 1/2in BSPP
RS Stock No. 486-237
BrandRS PRO
SGD53.21
Each
units
Single 1-1/2 in BSPP Brass 12 bar 1-1/2in BSPP
RS Stock No. 214-0655
Mfr. Part No.161561067
SGD291.77
Each
units
Single - PVC-U 16 bar - -
RS Stock No. 214-0649
Mfr. Part No.161561066
SGD203.98
Each
units
Single - PVC-U 16 bar - -
RS Stock No. 720-9282
BrandRS PRO
SGD189.24
Each
units
Single 1 in BSP Stainless Steel 25 bar 1in BSP
RS Stock No. 367-9441
Mfr. Part No.222000
SGD205.12
Each
units
Sight Glass 1/2 in BSPP Brass 3.5 bar 1/2in BSPP
RS Stock No. 458-6794
Mfr. Part No.4890 17 17
BrandLegris
SGD141.45
Each
units
Single 3/8 in G Stainless Steel 40 bar 3/8in G
RS Stock No. 214-0605
Mfr. Part No.161561063
SGD123.96
Each
units
Single 3/4 in Socket PVC-U 16 bar 3/4in -
RS Stock No. 720-9336
BrandRS PRO
SGD135.62
Each
units
Sight Glass 1/2 in BSP Brass 12 bar 1/2in BSP
RS Stock No. 340-3301
BrandRS PRO
SGD14.95
Each
units
Single 3/4 in BSP Brass 16 bar 3/4in BSP
RS Stock No. 510-3766
BrandRS PRO
SGD55.06
Each
units
Single 1 in BSPT Bronze 20 bar 1in BSPT
RS Stock No. 917-1934
Mfr. Part No.445631
SGD107.69
Each
units
- - Stainless Steel - 3/4in -
RS Stock No. 794-8353
Mfr. Part No.FIBV246908
SGD20.61
Each
units
Double 1/8 in BSP Brass 6 bar 1/8in BSP
RS Stock No. 214-0627
Mfr. Part No.161561065
SGD167.36
Each
units
Single - PVC-U 16 bar 1 1/4in -