Traveller
Member
Hello valveman
Do they make cycle stop valve systems capable of handling 40-50 gpm from a submersible pump?
Do they make cycle stop valve systems capable of handling 40-50 gpm from a submersible pump?
Thank you for the reply. Unfortunately, only single phase power is available at this location. However, in order to make the well functional, the owner is willing to purchase a single phase motor for the pump. I had been looking at installing a 30-50 pressure switch and bladder tank but, considering the gpm potential of this pump, it would require a very large bladder tank(s) to allow the pump to have a 1-2 minute run time each time it came on.
I was looking at the animation comparing the CSV system to a regular pressure switch/large bladder tank system. From what I can gather, everything in the CSV system operates identical to a pressure switch system, when a tap is opened, until the pressure drops to the cut-in pressure of the CSV's pump switch. Correct me if I am misinterpreting what I see but, at this point, it appears access to the bladder tank is cut off and the CSV meters a constant flow, dictated by demand, to the house. It also appears that pressure between the pump and the CSV can go as high as 130 psi and will drop as low as 60 psi as more devices ask for more water.
Please understand that I mean no disrespect by the next question, and the fact that these devices have been successfully installed for 20 years speaks for itself but, is there not a great potential for a water hammer between the CSV and the pump at the moment of startup, with access to the bladder tank being shut off? I only ask this because of a similar experience I had with a 5 hp submersible pump. I operate the water system for the village of 300 I live in. We have three wells (entire system at sea level) that each feed into the main 10" pipeline through their own branchlines. We also have a 130,000 gallon reservoir 220' above sea level that gives us a static gravity feed pressure of 94 psi throughout the system. The three pumps are turned off and on by float switches in the reservoir set at 75% and 100%. When the pumps start, they are required to start against this 94 psi backpressure, with no relief from any kind of air tank or relief valve. When our largest pump, a 5 hp submersible, started up, there was a vicious water hammer that would rattle all the plumbing in the pumphouse and bury the needles in both directions on the pressure gauges repeatedly. This went on until underground piping in the contact chamber outside the pumphouse let go. To solve the problem, we installed a VFD and 3 phase motor, but not as a constant pressure system. The VFD is only programmed as a "soft start" to start and stop the pump over six seconds instead of having the pump trying to come up to 3450 rpm in a fraction of a second.
As I said, please do not take offense at my question regarding water hammer as I am sure there is something in the CSV application I am missing.
Very good explanation. I have just one more question regarding the CSV, before I am totally converted.
In the case of the customer I first discussed, the one with the 3 hp, 50 gpm submersible pump feeding his irrigation system and the house he lives in, if he was to open a tap on a sink and let it run until the cut in pressure of the pump was reached, the pump would be running but only a fraction of its 50 gpm potential would be coming out of the faucet on the sink. Would there be an adequate amount of water going past the motor on the submersible pump to keep it cooled?
This is awkward, but...
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