Hydromechanical equipment
Engineered to manage extreme kinetic energy and safeguard penstock infrastructure during critical transient events.
Managing massive, pressurized water columns demands structural integrity and millisecond response. Litostroj Power Group engineers high-capacity Main Inlet Valves (MIV) and Energy Dissipation Systems (EDS)—protecting powerhouse machinery and downstream environments.
Synchronized with our digital governors, custom Pressure Regulating Valves (PRV) ensure fail-safe flow diversion and pressure stabilization during emergencies and grid rejections.
Operational parameters
Gatkeepers and guardians
Main inlet valves (MIV)
The primary mechanical isolation and protection for the hydromechanical unit.
Butterfly valves (low to medium head)
Turbine inlet valves for penstocks up to Ø3m, heads to 1000m, and velocities to 15 m/s. Streamlined obturator ensures minimal head loss.
Spherical / rotary valves (high head)
Turbine inlet valves for penstocks up to Ø3m, heads to 1000m, velocities to 15 m/s.
The metal sealing system
The metal sealing system (fixed + movable ring) guarantees drop‑tight closure every time. Need low downtime? The optional double seal lets you replace the maintenance seal without emptying the penstock – activated by pressurized water, mechanically locked, and monitored by limit switches for full peace of mind.
Built to last
Welded steel construction from forgings, plates, and castings. Closing options include a weighted lever or a double‑acting hydraulic actuator – perfect even for the tightest spaces.
Less spray. Zero leakage. Total peace of mind.
Pressure regulating valves (PRV) & bypass
Master high-head flow with fixed cone (Howell-Bunger) valves.
Howell-Bunger Valves (Fixed Cone)
Built for penstocks up to 2.75 m and heads up to 275 m, they deliver rugged, reliable performance in the most demanding conditions.
The conical jet releases into open air for efficient energy dissipation, while our optional baffled hood maximizes dispersion – ideal for submerged or splashing applications.
Choose soft rubber for drop‑tight sealing or metal seals for extreme durability. Welded steel construction ensures decades of service.
