Feed and Expansion float valve still leaking

[jbolland]

I've an open vented heating system with a red polytank for F & E. It was leaking at the overflow last month, and I thought it easiest just to replace the float valve (a Pegler Prestex float valve part 2 from Screwfix). Everything was OK for a few days, then it started a steady drip drip every 5 secs or so. I adjusted the ball float down to the end of the right angle lever arm and again all OK for few days. Now the drip drip is back. Should I bend the arm for increased closing force, or could the mains pressure be too high? A PRV is quite expensive!

 

[Neil K]

Is the drip definitely from the ballvalve. If yes make sure nut that forms part of the ballvalve (the one you have to open to get to the orifice /washer) is tight to the rest of the ballvalve. Give the arm of it a little bend by putting 2 pairs of upside down stilsons on it.

 

[Whyme]

The diaphragm washer could have a bit of muck between it and the high pressure seating.

 

[doitmyself]

then it started a steady drip drip every 5 secs or so.

Can you confirm that you mean a drip from the valve, not from the overflow pipe.

 

[Destroyer2813]

Turn off the water to f&e tank and see if it continues to overflow you may have yourself a split coil on your hot water cylinder

 

[Whyme]

Can you confirm that you mean a drip from the valve, not from the overflow pipe.

Good point, bit more info me thinks.

 

[happyflyer]

Photos please or we are all guessing..