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
$16.46
Each
units
Single 22 mm BSP Female Brass 10 bar 22mm BSP
RS Stock No. 794-8356
Mfr. Part No.FLOW230001
$14.06
Each
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Double 15 mm BSP Female Brass 10 bar 15mm BSP
RS Stock No. 340-3339
BrandRS PRO
$40.06
Each
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Single 1-1/2 in BSP Brass 16 bar 1-1/2in BSP
RS Stock No. 794-8384
Mfr. Part No.FLOW230910
$177.89
Each
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Double 2 in BSP Female Brass 10 bar 2in BSP
RS Stock No. 138-5656
Mfr. Part No.340055
BrandSferaco
$20.02
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Double 3/4 in BSP Female, 3/4 in BSP Male Brass 10 bar 3/4in 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. 510-3766
BrandRS PRO
$51.51
Each
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Single 1 in BSPT Bronze 20 bar 1in BSPT
RS Stock No. 178-0060
Mfr. Part No.2224110
BrandWatts
$11.07
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- 3/4 in Brass 10 bar - -
RS Stock No. 367-9441
Mfr. Part No.222000
$214.60
Each
units
Single 1/2 in BSPP Brass 3.5 bar 1/2in BSPP
RS Stock No. 720-9305
BrandRS PRO
$181.56
Each
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Single - Stainless Steel 40 bar 50mm ANSI
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. 720-9291
BrandRS PRO
$109.77
Each
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Single - Stainless Steel - 32mm -
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. 340-3323
BrandRS PRO
$24.95
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Single 1-1/4 in BSP Brass 16 bar 1-1/4in BSP
RS Stock No. 720-9273
BrandRS PRO
$132.70
Each
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Single 3/4 in BSP Stainless Steel 25 bar 3/4in BSP
RS Stock No. 794-8381
Mfr. Part No.FLOW230009
$151.56
Each
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Double 1-1/2 in BSP Female Brass 10 bar 1-1/2in BSP
RS Stock No. 214-0649
Mfr. Part No.161561066
$184.65
Each
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Single - PVC-U 16 bar - -
RS Stock No. 486-233
BrandRS PRO
$40.66
Each
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Single 2 in BSPP Brass 12 bar 2in BSPP
RS Stock No. 486-237
BrandRS PRO
$32.37
Each
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Single 1-1/2 in BSPP Brass 12 bar 1-1/2in BSPP
RS Stock No. 365-6684
Mfr. Part No.293200
$166.07
Each
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Single 3/4 in BSPP Bronze 14 bar 3/4in BSPP
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