If you have the head, yet another solution (and one which I successfully used at a site with 115psi) is to use the pressure in the penstock to drive a quarter turn actuator (via needle valves to control the open/close rate). These can be found in scrap yards and if you use a "leaking" needle valve, can work with a single solinoid valve controled by a pump float switch which then gives the heristeris(spel?).The controls were run off the generator with a bat to supply the few seconds of power until the turbine spun up.
On Wed, 2004-12-08 at 09:44, BjornOlaf wrote: > Here is another suggestion, avoiding emptying the supply tube and having the > associated clearing of air problems. > It involves some simple circuitry and a valve near the nozzle. > Suppose you have a float in the tank with a magnet on a stick, all being > guided by a tube and that you sense the lower and upper position by the > magnet closing a contact, cheep to get hold of used in alarm systems. > Then on an existing manual valve you use a linear actuator, (you get cheap > ones used for driving a satelite dish), to drive the valve open and shut as > required, using micro switches at each extreme end to indicate stop driving > when fully shut or fully open. The closing speed will be slow enough to > prevent any "waterHammer" action. > Best of luck. > /Bjorn > > "Hall,Clarrie" <[EMAIL PROTECTED]> wrote: > > > Another possible method which might be useful if you want relatively > short bursts of power and happen to like loud noises would be an > overbalancing bucket arrangement. > > Clarrie Hall > > > > luxury villa south of Torrevieja to let.. > http://www.holidaylets.net/prop_detail.asp?id=1482 > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > [Non-text portions of this message have been removed] > > > > > > > > Does your company feature in the microhydro business directory at > http://microhydropower.net/directory ? If not, please register free of charge > and be exposed to the microhydro community world wide! > > NOTE: The advertisements in this email are added by Yahoogroups who provides > us with free email group services. The microhydro-group does not endorse > products or support the advertisements in any way. > > More information on micro hydropower at http://microhydropower.net > > To unsubscribe: send empty message to [EMAIL PROTECTED] > Yahoo! Groups Links > > > > > -- Stuart Fraser (from remote server...) ------------------------ Yahoo! Groups Sponsor --------------------~--> $4.98 domain names from Yahoo!. Register anything. http://us.click.yahoo.com/Q7_YsB/neXJAA/yQLSAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
