F.Nencini Srl products

We engineer and produce several kinds of air valves, based on different operating principles : air release valves,  vacuum breakers,  combination air valves.

Main features : significant reduction in turbulence, vibration and noise. Fine regulation of the entire range of flow, made possible by the customized trim. High precision in the flow control. High rangeability.

The discharge of the flow is controlled by the movement of the sleeve of the valve against the fixed cone. The fixed cone valve discharges the raw water of dams to free air, chamber or underwater level. This valve is especially suitable to dissipate very high energy without any cavitation when discharge is made into free air. In the case when the water is discharged into chamber or underwater, Nencini is capable of designing the stilling pool or basin which are of primary importance for the effectiveness of the discharging and dissipation system.

Valves for maintenance or safety purposes, they are engineered and customized to the special needs of hydroelectric power plants. Used as isolation device, they provide tight shut-off when closed and little pressure loss when open. Relatively easy to operate, they require limited room for installation. Large sizes are designed with biplane disc, lattice type, double eccentric and triple eccentric execution. We produce single or double seat type valves.

One-way valves allowing the fluid to flow in only one direction and preventing the backflow.

Generally used as guard valves in high-pressure outlet for dams, the gates operate in wide open or full closed position and therefore are suitable for all on/off applications.

The simplicity of the design allows this valve to work under heavy flow condition for a long time. It is composed by one multi-hole plate assembled between two propeller-shaped plates, one fixed and the other rotating on the common axis.