Pelton Turbine Needle Valve
Pelton Turbine Needle Valve
(OP)
We have a small Pelton Wheel type hydroelectric project with two needle valves. The needle valves have an internal hydraulic actuator and one of them has a compromised seal and is leaking oil. That is a big problem in the environmentally sensitive area. I've seen needle valves with a hydraulic spear actuators that were external so that a leaking seal would not get into the water. We are thinking this would be a good option for fixing the problem. I have not found many manufacturers of needle valves, are there any in the US? Any additional recommendation to fix this issue? Thanks!





RE: Pelton Turbine Needle Valve
RE: Pelton Turbine Needle Valve
RE: Pelton Turbine Needle Valve
RE: Pelton Turbine Needle Valve
The turbine is a Sanden from Norway from 1985. It's rated 850kW with 550Ft of head and 360RPM. I don't have the actual head available but it's at least several hundred feet.
I tried to attach two photos, one of the inside and one of the outside, but it may reduce to just one. I'll post the other one if need be.
RE: Pelton Turbine Needle Valve
RE: Pelton Turbine Needle Valve
Have you contacted the manufacturer to see if they have options available?
If you must use hydraulics, consider finding biodegradable fluids, or propylene glycol/water mixtures, to reduce environmental impacts.
RE: Pelton Turbine Needle Valve
RE: Pelton Turbine Needle Valve
What you have is an axial control valve or sometimes axial plug control valve.
Mokveld in Netherlands make very good ones, also petrolvalves, Dyna-flow and others, but use these search terms and you'll be better informed.
Most of these operate via a gear mechanism to an external actuator, but then have some interference with flow.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.