Whats the difference between Part 1 and Part 2 Float Valves

Whats the difference between Part 1 and Part 2 Float Valves

It is very easy to spot the difference between a Part 1 and Part 2 ball float valve. A part 1 Valve has the water outlet spout on the underside of the float valve and a part 2 has it on top of the body with a plastic nozzle which directs the water downwards into the tank. Both types are typically found in loft cold water tanks or feed and expansion tanks

The reason there are two different types is because Part 1 are now obsolete for new installations. Water regulations do not allow them to be fitted on new installs and if the opportunity arises they should be changed for Part 2 float valves. This is because if the float valve fails then the water level will submerge the outlet nozzle, and then if there is a pressure drop then the water in the tank can siphon back into the mains water system. This is a big no-no for Water Regulations, hence why the Part 2 float valve was introduced where the nozzle is on the upper side of the valve and should not get submerged

Another difference between a Part 1 and Part 2 ball float valve is the way they can be adjusted. A Part 2 float valve has the float ball fixing on a lockable collar which allows it to be moved up or down to suit the water shut off level. A Part 1 float valve has no such adjustment and relies on bending the arm to adjust the water shut off level

We sell all different types of Ball Float Valves which can be found on this link

4th Mar 2020

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