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. 794-8397
Mfr. Part No.FLOW235002
HK$106.09
Each
units
Single 22 mm BSP Female Brass 10 bar 22mm BSP
RS Stock No. 794-8394
Mfr. Part No.FLOW235004
HK$94.61
Each
units
Single 1/2 in BSP Female Brass 10 bar 1/2in BSP
RS Stock No. 794-8388
Mfr. Part No.FLOW235001
HK$67.50
Each
units
Single 15 mm BSP Female Brass 10 bar 15mm BSP
RS Stock No. 458-6788
Mfr. Part No.4890 13 13
BrandLegris
HK$628.48
Each
units
Single 1/4 in G Stainless Steel 40 bar 1/4in G
RS Stock No. 340-3339
BrandRS PRO
HK$302.02
Each
units
Single 1-1/2 in BSP Brass 16 bar 1-1/2in BSP
RS Stock No. 486-209
BrandRS PRO
HK$86.37
Each
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Single 1/2 in BSPP Brass 16 bar 1/2in BSP
RS Stock No. 214-0605
Mfr. Part No.161561063
HK$741.08
Each
units
Single 3/4 in Socket PVC-U 16 bar 3/4in -
RS Stock No. 720-9336
BrandRS PRO
HK$766.44
Each
units
Sight Glass 1/2 in BSP Brass 12 bar 1/2in BSP
RS Stock No. 720-9320
BrandRS PRO
HK$1,153.73
Each
units
Sight Glass 1/2 in BSP Bronze 10 bar 1/2in BSP
RS Stock No. 720-9282
BrandRS PRO
HK$1,069.44
Each
units
Single 1 in BSP Stainless Steel 25 bar 1in BSP
RS Stock No. 696-4708
BrandConvac
HK$4,946.53
Each
units
- - - - - -
RS Stock No. 499-2638
BrandRS PRO
HK$479.56
Each
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Single 3/4 in BSP Stainless Steel 14 bar 3/4in BSP
RS Stock No. 458-6794
Mfr. Part No.4890 17 17
BrandLegris
HK$772.31
Each
units
Single 3/8 in G Stainless Steel 40 bar 3/8in G
RS Stock No. 284-2755
BrandRS PRO
HK$3,556.20
Each
units
Single 2 in BSPT Bronze 25 bar 2in BSPT
RS Stock No. 794-8366
Mfr. Part No.FLOW230005
HK$98.16
Each
units
Double 1/2 in BSP Female Brass 10 bar 1/2in BSP
RS Stock No. 214-0611
Mfr. Part No.161561064
HK$797.48
Each
units
Single - PVC-U 16 bar 1in -
RS Stock No. 499-2650
BrandRS PRO
HK$644.76
Each
units
Single 1 in BSP Stainless Steel 14 bar 1in BSP
RS Stock No. 365-6684
Mfr. Part No.293200
HK$757.90
Each
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Single 3/4 in BSPP Bronze 14 bar 3/4in BSPP
RS Stock No. 510-3738
BrandRS PRO
HK$904.87
Each
units
Single 2 in BSPT Bronze 20 bar 2in BSPT
RS Stock No. 214-0598
Mfr. Part No.161561062
HK$624.74
Each
units
Single - PVC-U 16 bar 1/2in -
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