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Valve Tech / Low pressure

« on: October 28, 2012, 09:58:00 AM »

Hi.  In August I replaced my Grundfos pump with a  Webtrol WT18102C, 18 gpm 1HP pump, 40/60 pressure switch, 44 Gallon pressure tank and CSV1W valve.  My well is approx. 35' deep with the cycle stop valve about 5' below the pitless and 100' of 1" to the house.   When I first installed it, the pressure in my house was constant at a little under 50psi.   Now, when there is a draw, heat pump starts, the pressure drops to 40psi.  If I run another tap, it'll drop lower.  I'm using a liquid filled pressure gauge, not a cheap plastic piece of crap.   The pump starts at 40 and stops at 60, so I'm sure it's not the gauge.   Could this valve be faulty?  My big fear is a damaged pump just before snow starts to fly.