2011年8月5日 · Hello, I'm trying to change the pressure relief valve on my Megaflo. I've got the right replacement part, I've drained the boiler. The old valve has corroded so when i unscrewed it, the black plastic housing came away from the rest, leaving most of the valve stuck in.

The pressure relief valve helps to eleviate pressure build up within a central heating system. It is set to open proportionally to increasing pressure to prevent pressure causing the system to malfunction or break . Ideal for Heatrae Sadia Megaflo Cylinder Internal Air Gap; Ideal for Heatrae Sadia Megaflo Eco Unvented Cylinder

2014年1月10日 · The pressure relief valve on the side of the cylinder vents (fast at first and then a trickle) for a few minutes starting about 10 minutes after the boiler comes on to heat the hot water as the pressure rises. This is because the air gap in the cylinder has gone. As the cylinder gets up to temperature the valve stops venting.

2009年10月8日 · Turn the valve off above the leaking part (this is the mains inlet). 2. Turn on a hot water tap in your house - this releases the pressure. Only a little water will come out before it stops. 3. Unscrew the centre section of the valve (you'll need a big spanner/mole wrench). It comes out very easily. 4.

2010年12月6日 · Perfectly safe to reduce the pressure via a rad bleed valve. As to why it has shot up it's possible the iso valve is letting by raising the water pressure or the expanssion vessel may have lost it's charge or may need replacing. Get a G3 competant engineer to check it over