laffin_boy
New Member
I'm trying to put together a parts list for my water system and I have a question about Cycle Stop Valves.
I have a 100' well where I intend to set a Goulds 5GS series pump @ 70'. Just after the pitless adapter the 1" pvc will feed in this sequence:
-- the CSV (?)
-- several canister filters of various types (est total press drop approx 6 - 8 psi)
-- a 1.5 GPM dole valve (?)
-- then up 100' to a 2500 gal on the hill
The system will have very low usage - approx 25 gal / day - so once the tank is filled the pump *should* only run 15 min a day to top up the tank.
I've added the 1.5 GMP Dole Valve because I need the low flow rate to get sufficient "contact time" for the filter media to do it's job.
I added the CSV because at this flow rate the 5GS pump chart shows a TDH of 390' which would apply as much as 140 psi to the filters. (BB filter housings are rated @ 125 psi max) I probably don't need the CSV to prevent pump cycling for the little usage it's going to get.
I've scoured the 'net for info on the CSV and read most of the CSV website but I *still* don't understand how it works which is why i'm posting here. Nor do I understand how the DV works internally either.
OK, here's my question: The CSV and the Dole Valve are both variable inline restrictions but the CSV maintains (within design limits) a constant output *pressure* while the Dole Valve (again within design limits) maintains a constant flow rate. But do I need them both? Is there another way to reduce input pressure to the filters *and* maintain the 1.5 GPM flow rate I need? If I eliminated the CSV and moved the DV upstream of the filters would the pressure drop across the DV bring the inlet pressures down to a reasonable level? Any way to estimate the drop across the DV?
laffin_boy
I have a 100' well where I intend to set a Goulds 5GS series pump @ 70'. Just after the pitless adapter the 1" pvc will feed in this sequence:
-- the CSV (?)
-- several canister filters of various types (est total press drop approx 6 - 8 psi)
-- a 1.5 GPM dole valve (?)
-- then up 100' to a 2500 gal on the hill
The system will have very low usage - approx 25 gal / day - so once the tank is filled the pump *should* only run 15 min a day to top up the tank.
I've added the 1.5 GMP Dole Valve because I need the low flow rate to get sufficient "contact time" for the filter media to do it's job.
I added the CSV because at this flow rate the 5GS pump chart shows a TDH of 390' which would apply as much as 140 psi to the filters. (BB filter housings are rated @ 125 psi max) I probably don't need the CSV to prevent pump cycling for the little usage it's going to get.
I've scoured the 'net for info on the CSV and read most of the CSV website but I *still* don't understand how it works which is why i'm posting here. Nor do I understand how the DV works internally either.
OK, here's my question: The CSV and the Dole Valve are both variable inline restrictions but the CSV maintains (within design limits) a constant output *pressure* while the Dole Valve (again within design limits) maintains a constant flow rate. But do I need them both? Is there another way to reduce input pressure to the filters *and* maintain the 1.5 GPM flow rate I need? If I eliminated the CSV and moved the DV upstream of the filters would the pressure drop across the DV bring the inlet pressures down to a reasonable level? Any way to estimate the drop across the DV?
laffin_boy