Introduction
Di Nicola double and triple eccentric butterfly valves represent the global benchmark for high-performance fluid isolation and regulation within aqueducts, municipal waterworks, and hydroelectric infrastructures. Specially engineered to eliminate seal friction and dragging against the body seat during motion, these advanced valves drastically lower internal component wear and operating torque requirements. The hydrodynamically optimized profile provides minimal pressure losses under fully open states paired with a reliable drop-tight, bubble-free chemical closure. Combining exceptional structural reliability with an array of flexible actuation options, they offer an unparalleled technical and financial benefit for heavy-duty pipeline management.
Key Features
Double or triple offset design carefully calculated to ensure instant seal detachment from the body seat and minimize closing torques , absolute bi-directional drop-tight flow sealing integrity , highly reduced face-to-face overall dimensions to streamline field installations in confined spaces , premium stainless steel seat deposited directly onto the valve body , single-piece main profile sealing ring retained on the disc edge and fully replaceable on-site without removing the disc assembly , high-tensile stainless steel upper and bottom drive shafts , low-friction self-lubricating bronze or heavy PTFE-composite guide bushings , integrated mechanical position indicator and fully adjustable open/close limit switches , native prearrangement for positive safety actuator groups using a lever and counterweight for automated gravity-driven emergency pipeline isolation upon electrical power loss or line ruptures.
Technical Data Table
Applications and Benefits
- Aqueducts and main water distribution grids: Premier flow isolation and precise modulation devices yielding minimized continuous head loss and time-tested zero-leakage performance;
- Hydroelectric assets and cooling plants: Critical application as main penstock positive safety valves for immediate pipeline shutdown upon turbine failures or sudden line over-velocity caused by pipeline fractures;
- Water lifting layouts and pumping networks: Advanced protection of moving mechanical elements against destructive fluid backflows during sudden power failures;
- Outstanding commercial cost-effectiveness: Specialized design practices that deliver a highly competitive, lighter weight, and easier to service product compared to traditional heavy valve designs under equal field conditions.
Why Choose Our Products
Di Nicola manufactures butterfly valves in single, double and triple offset in alloys of ductile iron EN GJS 400 to EN GJS 500, malleable cast iron GJL 250 and high- nickel NI resist , carbon steel ASTM 216 WCB / N + GP 240GH, under construction EN S275J0 steel and stainless steel with high nickel content from over fifty years with sizes between 150 and 3000 mm and nominal pressures from 2.5 bar to 64 bar and ANSI Class 125 to Class 600. Di Nicola butterfly valves answer to major international standards such as EN 593 , EN ISO 1074-1, EN ISO 1074-2 , DIN 3202 , BS 5150, ISO 5752 , ASME B16.10 and AWWA C – 504 . With marked according to EN ISO 19 and flanges according to EN 1092-2 , ISO 2531, BS4504 test according to EN 12266-1. The company Di Nicola produces non-standard on request of customers.
Examine the complete dimensional ranges, exact Kv flow factors, and cavitation coefficient limits of our double offset butterfly valves directly inside the technical catalog. Contact our technical sales experts today to receive a tailored quotation or to configure the ideal manual, electric, pneumatic, or oleodynamic actuator system for your pipeline.
