Hi,
Suggestions as to how I might cure this.
The layout is that the vent pipe is on the inlet side of the pump as in the header feed. The feed comes in looping under then up and the vent comes straight out and up. There is a auto bypass valve around the pump. So all is as it should be.
When the pump turns off there is a whoosh of water into the header tank. I can reduce that by lowering the pump speed. I've raised the overflow pipe as high as I can (low roof). If I only crack a valve in the feed in from the header tank then I think this helps. What it looks like is that the pump stops dead when it turns off and the inertia of the water pushes the pressure up causing a cup of water to go into the header tank.
I was thinking of a check valve so that the water could continue to flow round the pump but the pressure increase may not be enough to over come the spring. The overflow is about 2ft over the header tank water.
I was wondering if a mini-arrestor for water hammer might do the trick?
Suggestions as to how I might cure this.
The layout is that the vent pipe is on the inlet side of the pump as in the header feed. The feed comes in looping under then up and the vent comes straight out and up. There is a auto bypass valve around the pump. So all is as it should be.
When the pump turns off there is a whoosh of water into the header tank. I can reduce that by lowering the pump speed. I've raised the overflow pipe as high as I can (low roof). If I only crack a valve in the feed in from the header tank then I think this helps. What it looks like is that the pump stops dead when it turns off and the inertia of the water pushes the pressure up causing a cup of water to go into the header tank.
I was thinking of a check valve so that the water could continue to flow round the pump but the pressure increase may not be enough to over come the spring. The overflow is about 2ft over the header tank water.
I was wondering if a mini-arrestor for water hammer might do the trick?