Based upon model tests, the lens type and lattice door ( through flow ) type valves are optimized and a minimum flow head loss coefficient of 0.07 can be guaranteed.
This type of valve is mainly used as safety valve or as a turbine inlet valve and pump valve. They are operated by oil hydraulic systems for opening and closing or closing weight and hydraulic pressure for opening. For turbine inlet valves oil pressure can be taken also from the governor hydraulic oil system. The sealing system is of flexible adjustable type - rubber/metal or metal/metal. The lattice door type valves can be also equipped with a maintenance seal. The hydraulic and electric / electronic control system is part of the delivery. Auxiliary equipment like bypass, air and vacuum valve, pipe rupture device, connecting pipes are usually in the scope of supply. Water flow through the valve in both directions is principally possible.
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