Introduction
Plunger or needle valves are specifically designed to regulate water flow, ensuring optimal control even under heavy hydrostatic loads and variable operating pressures. Thanks to a special balancing chamber, these solutions eliminate vibrations and anomalous fluid dynamic loads, effectively preventing the onset of cavitation. Further details on performance and accurate sizing based on real flow conditions are available within the downloadable catalog.
Key Features
Robust construction in high-strength ductile iron, horizontal slider movement of the obturator for a smooth closing mechanism in the flow direction without effort, sealing ring protected from the main flow to minimize maintenance interventions, optimized design for downstream sealing ring disassembly without removing the valve body from the pipeline, anti-corrosive epoxy coating certified for drinking water, full compatibility with multiple actuation systems and remote control accessories.
Technical Data Table
Applications and Benefits
- Aqueduct and irrigation networks: precise control of upstream or downstream pressure and programmed flow modulation;
- Dams and hydropower plants: excellent reliability as bottom outlet, turbine safety valves, and energy dissipation;
- Industrial systems and water treatment: secure isolation under high operating pressure and high fluid velocity;
- Cavitation management: use of perforated or slotted cylinders to collapse vapor bubbles at the center of the flow avoiding wall damage.
Why Choose Our Products
Di Nicola manufactures free discharge valves type Plunger in ductil iron EN GJS 400 and EN GJS 500, in malleable cast iron GJL 250, in high-nickel NI resist, in carbon steel ASTM 216 WCB / GP 240GH + N, in construction of steel EN S275J0 and stainless steel 1.4404 and 1.4462 for over forty years with sizes between 100 and 1600 mm and nominal pressures from 2.5 bar to 40 bar and ANSI Class 125 to Class 300 .The collaboration with Eng. Onelio Sala, chief designer Riva Calzoni spa, since the 70s, has led to the development of a valve with performance in reducing cavitation phenomenon unique in the world because in 90% of cases the cavitation phenomenon is neutralized by the special shape inside the valve body, drastically reducing the use of external accessories anti cavitation and resulting in higher flow capacity in cubic meters / second compared to valves manufactured by the competition. Control valves type Plunger Di Nicola respond to major international standards such as EN 593, EN ISO 1074-1, EN ISO 1074-5, DIN 3202. With marked according to EN ISO 19 and flanges according to EN 1092-2, ISO 2531, BS4504, ANSI B16.10, test according to EN 12266-1. Plunger valves Di Nicola come with a range of accessories such operating headstocks, mechanical position indicators, electrical and hydraulic actuators, anti cavitation holed rings , anti cavitation vaned cylinders and others.
Contact our technical department to receive a personalized engineering consultation on the ideal sizing for your hydraulic system. Request a dedicated quote now or consult the product brochure to analyze flow charts and cavitation coefficients.
