Our Spear Valves are a valve and a nozzle in one fitting that gives a continuous control over the flow of water. We build and provide a motorized spear valve which can be controlled by a logic circuits to maintain constant water level in your intake and maximize energy production even on very low part load, below 5% of design flow on a multi jet machine.
Fabricated from 304 SS, TiG welded in South Wales, we currently produce 3″, 4″, 5″, 6″ and 8″ spear valve Assembly. All our spear valves come motorized with a 12v DC actuator operating 6 Nm of force at 25 RPM. Higher capacity motors are available for higher head schemes.
Every runner is bespoke to a scheme, the size will have an effect on the speed it rotates. This needs to be matched up with the rated speed of the generator.
Higher power turbines require larger, therefore stronger runners, which will rotate at a slower rpm, the speed will then be dictated by the amount of spoons in the runner.
In certain circumstances there isn’t a maintenance port at the intake. This will be problematic when it comes to pig the pipe in the future. A pig launcher will allow pigging access without health and safety risk, often overseen in early developments.
When it comes to sites that have public right of way, it is normally a planning requirement to have hand rails to provide a safety barrier between the public and anything that could be a danger.
Normal planning requirements state that the tail-race must be inaccessible to fish and other animals. We can fabricate a suitable solution.