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. 486-211
BrandRS PRO
$32.54
Each
units
Single 1-1/4 in BSPP Brass 16 bar 1-1/4in BSP
RS Stock No. 499-2622
BrandRS PRO
$73.96
Each
units
Single 1/2 in BSP Stainless Steel 14 bar 1/2in BSP
RS Stock No. 720-9295
BrandRS PRO
$132.69
Each
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Single - Stainless Steel - 40mm -
RS Stock No. 486-182
BrandRS PRO
$53.78
Each
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Single 2 in BSPP Brass 16 bar 2in BSP
RS Stock No. 284-2727
BrandRS PRO
$128.90
Each
units
Single 1 in BSPT Bronze 25 bar 1in BSPT
RS Stock No. 720-9305
BrandRS PRO
$181.56
Each
units
Single - Stainless Steel 40 bar 50mm ANSI
RS Stock No. 365-6690
Mfr. Part No.293300
$237.70
Each
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Single 1 in BSPP Bronze 14 bar 1in BSPP
RS Stock No. 720-9279
BrandRS PRO
$107.10
Each
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Single 1/2 in BSP Stainless Steel 25 bar 1/2in BSP
RS Stock No. 720-9298
BrandRS PRO
$79.64
Each
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Single - Stainless Steel - 25mm -
RS Stock No. 340-3345
BrandRS PRO
$55.16
Each
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Single 2 in BSP Brass 16 bar 2in BSP
RS Stock No. 917-1934
Mfr. Part No.445631
$106.03
Each
units
- - Stainless Steel - 3/4in -
RS Stock No. 499-2666
BrandRS PRO
$104.28
Each
units
Single 1-1/4 in BSP Stainless Steel 14 bar 1-1/4in BSP
RS Stock No. 794-8362
Mfr. Part No.FLOW230004
$46.45
Each
units
Double 28 mm BSP Female Brass 10 bar 28mm BSP
RS Stock No. 458-6794
Mfr. Part No.4890 17 17
BrandLegris
$192.69
Each
units
Single 3/8 in G Stainless Steel 40 bar 3/8in G
RS Stock No. 720-9336
BrandRS PRO
$101.38
Each
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Sight Glass 1/2 in BSP Brass 12 bar 1/2in BSP
RS Stock No. 366-4657
Mfr. Part No.223300
$371.45
Each
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Single 3/4 in BSPP Bronze 3.6 bar 3/4in BSPP
RS Stock No. 794-8378
Mfr. Part No.FLOW230907
$56.18
Each
units
Double 1 in BSP Female Brass 10 bar 1in BSP
RS Stock No. 284-2733
BrandRS PRO
$204.95
Each
units
Single 1-1/4 in BSPT Bronze 25 bar 1-1/4in BSPT
RS Stock No. 510-3788
BrandRS PRO
$46.51
Each
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Single 3/4 in BSPT Bronze 20 bar 3/4in BSPT
RS Stock No. 138-5656
Mfr. Part No.340055
BrandSferaco
$20.02
Each
units
Double 3/4 in BSP Female, 3/4 in BSP Male Brass 10 bar 3/4in BSP
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