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
SGD14.04
Each
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Single 3/8 in BSPP Brass 12 bar 3/8in BSPP
RS Stock No. 499-2622
BrandRS PRO
SGD69.85
Each
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Single 1/2 in BSP Stainless Steel 14 bar 1/2in BSP
RS Stock No. 486-148
BrandRS PRO
SGD13.95
Each
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Single 1/2 in BSPP Brass 12 bar 1/2in BSPP
RS Stock No. 720-9282
BrandRS PRO
SGD204.19
Each
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Single 1 in BSP Stainless Steel 25 bar 1in BSP
RS Stock No. 486-237
BrandRS PRO
SGD58.99
Each
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Single 1-1/2 in BSPP Brass 12 bar 1-1/2in BSPP
RS Stock No. 510-3766
BrandRS PRO
SGD65.55
Each
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Single 1 in BSPT Bronze 20 bar 1in BSPT
RS Stock No. 340-3301
BrandRS PRO
SGD16.88
Each
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Single 3/4 in BSP Brass 16 bar 3/4in BSP
RS Stock No. 720-9336
BrandRS PRO
SGD156.10
Each
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Sight Glass 1/2 in BSP Brass 12 bar 1/2in BSP
RS Stock No. 720-9273
BrandRS PRO
SGD191.88
Each
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Single 3/4 in BSP Stainless Steel 25 bar 3/4in BSP
RS Stock No. 720-9295
BrandRS PRO
SGD197.85
Each
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Single - Stainless Steel - 40mm -
RS Stock No. 486-205
BrandRS PRO
SGD36.71
Each
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Single 1 in BSPP Brass 16 bar 1in BSP
RS Stock No. 486-164
BrandRS PRO
SGD21.20
Each
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Single 1 in BSPP Brass 12 bar 1in BSPP
RS Stock No. 499-2688
BrandRS PRO
SGD311.07
Each
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Single 2 in BSP Stainless Steel 14 bar 2in BSP
RS Stock No. 499-2650
BrandRS PRO
SGD128.89
Each
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Single 1 in BSP Stainless Steel 14 bar 1in BSP
RS Stock No. 486-158
BrandRS PRO
SGD19.08
Each
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Single 3/4 in BSPP Brass 12 bar 3/4in BSPP
RS Stock No. 720-9320
BrandRS PRO
SGD234.97
Each
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Sight Glass 1/2 in BSP Bronze 10 bar 1/2in BSP
RS Stock No. 486-221
BrandRS PRO
SGD67.88
Each
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Single 1-1/2 in BSPP Brass 16 bar 1-1/2in BSP
RS Stock No. 720-9349
BrandRS PRO
SGD198.02
Each
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Sight Glass 1 in BSP Brass 12 bar 1in BSP
RS Stock No. 486-233
BrandRS PRO
SGD62.57
Each
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Single 2 in BSPP Brass 12 bar 2in BSPP
RS Stock No. 510-3738
BrandRS PRO
SGD199.37
Each
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Single 2 in BSPT Bronze 20 bar 2in BSPT