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White concealed washing machine dishwasher waste pipe drain trap kit self cutting out
£10.99 Ex VAT: £9.16
Its made to hide all plumbing fittings inside the wall. This..
Its made to hide all plumbing fittings inside the wall. This.....
1 1/4 bsp female check foot valve suction brass non return valve for pump
£19.99 Ex VAT: £16.66
Suitable for suction lines on top-offtake tanks (where an an..
Suitable for suction lines on top-offtake tanks (where an an.....
3/4 swing clack non-return check valve brass one-way valves
£13.99 Ex VAT: £11.66
The Swing Check Type Non Return Valve prevents water from re..
The Swing Check Type Non Return Valve prevents water from re.....
1" Inch Brass Check Non-return Valve Female With Brass Insert
£15.99 Ex VAT: £13.33
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
White washing machine dishwasher waste pipe drain trap kit self cutting out nozzle
£10.99 Ex VAT: £9.16
This kit prevents smells from your sink going back into your..
This kit prevents smells from your sink going back into your.....
Chrome washing machine dishwasher waste pipe drain trap kit self cutting out nozzle
£11.99 Ex VAT: £9.99
This kit prevents smells from your sink going back into your..
This kit prevents smells from your sink going back into your.....
Chrome concealed washing machine dishwasher waste pipe drain trap kit self cutting out
£11.99 Ex VAT: £9.99
Its made to hide all plumbing fittings inside the wall. This..
Its made to hide all plumbing fittings inside the wall. This.....
6/4 (1 1/2) swing clack non-return check valve brass one-way valves
£28.99 Ex VAT: £24.16
The Swing Check Type Non Return Valve prevents water from re..
The Swing Check Type Non Return Valve prevents water from re.....
6/4" (1 1/2") Inch Brass Check Non-return Valve Female With Brass Insert
£23.99 Ex VAT: £19.99
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
5/4 (1 1/4) swing clack non-return check valve brass one-way valves
£22.99 Ex VAT: £19.16
The Swing Check Type Non Return Valve prevents water from re..
The Swing Check Type Non Return Valve prevents water from re.....
5/4" (1 1/4") Inch Brass Check Non-return Valve Female With Brass Insert
£19.99 Ex VAT: £16.66
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
3/4" Inch Brass Check Non-return Valve Female With Brass Insert
£12.99 Ex VAT: £10.83
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
3/4 Inch BSP Brass Check Non-Return Valve Female With Plastic Insert
£11.99 Ex VAT: £9.99
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
3 Inch BSP Brass Check Non-Return Valve Female With Plastic Insert
£52.99 Ex VAT: £44.16
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
2 swing clack non-return check valve brass one-way valves
£43.99 Ex VAT: £36.66
The Swing Check Type Non Return Valve prevents water from re..
The Swing Check Type Non Return Valve prevents water from re.....
2" Inch Brass Check Non-return Valve Female With Brass Insert
£33.99 Ex VAT: £28.33
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
2 Inch BSP Brass Check Non-Return Valve Female With Plastic Insert
£26.99 Ex VAT: £22.49
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
2 1/2 (10/4) Inch BSP Brass Check Non-Return Valve Female With Plastic Insert
£47.99 Ex VAT: £39.99
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
1/2 swing clack non-return check valve brass one-way valves
£11.99 Ex VAT: £9.99
The Swing Check Type Non Return Valve prevents water from re..
The Swing Check Type Non Return Valve prevents water from re.....
1/2" Inch Brass Check Non-return Valve Female With Brass Insert
£10.99 Ex VAT: £9.16
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
1/2 Inch BSP Brass Check Non-Return Valve Female With Plastic Insert
£10.99 Ex VAT: £9.16
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
1 swing clack non-return check valve brass one-way valves
£15.99 Ex VAT: £13.33
The Swing Check Type Non Return Valve prevents water from re..
The Swing Check Type Non Return Valve prevents water from re.....
1 caleffi 3230 ballstop ball valve with check non-return valve
£29.99 Ex VAT: £24.99
The ballstop range of in line lever ball valves with an inte..
The ballstop range of in line lever ball valves with an inte.....
1 bsp female check foot valve suction brass non return valve for pump
£16.99 Ex VAT: £14.16
Suitable for suction lines on top-offtake tanks (where an an..
Suitable for suction lines on top-offtake tanks (where an an.....
1 Inch BSP Brass Check Non-Return Valve Female With Plastic Insert
£13.99 Ex VAT: £11.66
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
1 1/4 (5/4) Inch BSP Brass Check Non-Return Valve Female With Plastic Insert
£17.99 Ex VAT: £14.99
Check valve non-return valve female to female. Suitable for ..
Check valve non-return valve female to female. Suitable for .....
1 1/2 bsp female check foot valve suction brass non return valve for pump
£25.99 Ex VAT: £21.66
Suitable for suction lines on top-offtake tanks (where an an..
Suitable for suction lines on top-offtake tanks (where an an.....

Check valves

Check valves
A check valve, clack valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.
Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.
An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.


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