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. 458-6788
Mfr. Part No.4890 13 13
BrandLegris
$156.88
Each
units
Single 1/4 in G Stainless Steel 40 bar 1/4in G
RS Stock No. 340-3301
BrandRS PRO
$18.62
Each
units
Single 3/4 in BSP Brass 16 bar 3/4in BSP
RS Stock No. 720-9285
BrandRS PRO
$63.40
Each
units
Single - Stainless Steel - 15mm -
RS Stock No. 365-6678
Mfr. Part No.293100
$95.50
Each
units
Single 1/2 in BSPP Bronze 14 bar 1/2in BSPP
RS Stock No. 896-8355
Mfr. Part No.1/4SCV
BrandJohn Guest
$128.74
1 Bag of 10
Bag(s)
Single 1/4 in Push Fit Acetal Copolymer 10 bar - -
RS Stock No. 486-205
BrandRS PRO
$24.30
Each
units
Single 1 in BSPP Brass 16 bar 1in BSP
RS Stock No. 754-987
Mfr. Part No.15DCV
$23.67
Each
units
Double - POM 12 bar - -
RS Stock No. 917-1943
Mfr. Part No.445752
$144.99
Each
units
Sight Glass 3/4 in Rp Female Brass 12 bar 3/4in BSP
RS Stock No. 340-3317
BrandRS PRO
$18.47
Each
units
Single 1 in BSP Brass 16 bar 1in BSP
RS Stock No. 486-209
BrandRS PRO
$12.20
Each
units
Single 1/2 in BSPP Brass 16 bar 1/2in BSP
RS Stock No. 486-158
BrandRS PRO
$13.74
Each
units
Single 3/4 in BSPP Brass 12 bar 3/4in BSPP
RS Stock No. 214-0605
Mfr. Part No.161561063
$157.00
Each
units
Single 3/4 in Socket PVC-U 16 bar 3/4in -
RS Stock No. 214-0627
Mfr. Part No.161561065
$162.01
Each
units
Single - PVC-U 16 bar 1 1/4in -
RS Stock No. 510-3744
BrandRS PRO
$83.76
Each
units
Single 1-1/2 in BSPT Bronze 20 bar 1-1/2in BSPT
RS Stock No. 486-170
BrandRS PRO
$13.09
Each
units
Single 3/8 in BSPP Brass 12 bar 3/8in BSPP
RS Stock No. 486-215
BrandRS PRO
$14.64
Each
units
Single 3/4 in BSPP Brass 16 bar 3/4in BSP
RS Stock No. 510-3722
BrandRS PRO
$30.39
Each
units
Single 1/2 in BSPT Bronze 20 bar 1/2in BSPT
RS Stock No. 282-0828
BrandRS PRO
$77.94
Each
units
Single 1/2 in BSPT Bronze 25 bar 1/2in BSPT
RS Stock No. 510-3738
BrandRS PRO
$95.02
Each
units
Single 2 in BSPT Bronze 20 bar 2in BSPT
RS Stock No. 720-9295
BrandRS PRO
$141.90
Each
units
Single - Stainless Steel - 40mm -
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