Penstock and Main Inlet Valves
The function of the penstock and main inlet valves is to isolate the unit and completely cut-off the water flow on the location where such valve is installed. The usual types of such valves are spherical valves and butterfly valves. They usually serve as a safety device and are capable of closing at the maximum water discharge.
Main inlet valves are positioned between the penstock and the turbine spiral case, while the penstock valves can be located anywhere inside the penstock.
- Spherical valve
- Solid-type butterfly valve
- Lattice-type (or biplane) butterfly valve
- Drop-tight leakage
- Single- or double-seal design