Triple eccentric butterfly valve, D343H butterfly valve, cast steel butterfly valve, hard seal butterfly valve, Zhejiang butterfly valve,

Zhejiang Putian triple eccentric butterfly valve is suitable for flow regulation. Due to the significant pressure loss of butterfly valves in pipelines, the robustness of the disc when subjected to pipeline media pressure during closure must also be considered. Additionally, the limitations of the elastic seat material under high temperatures must be taken into account. Butterfly valves feature a compact structure length and overall height, fast opening and closing speeds, and fluid control characteristics, making their structural principle suitable for large-diameter valves. When using butterfly valves for flow control, it is crucial to correctly select the size and type to ensure proper and efficient operation.

Zhejiang Putian triple eccentric butterfly valve is typically recommended for applications involving throttling, regulation control, and slurry media where short structure length and rapid opening/closing (1/4 turn) are required, as well as for low-pressure shut-off (small pressure difference).

Zhejiang Putian triple eccentric butterfly valve can be selected for applications such as dual-position regulation, constricted channels, low noise, cavitation and vaporization phenomena, minor leakage to the atmosphere, and abrasive media.

For special operating conditions involving throttling regulation, strict sealing requirements, severe wear, or low temperatures (cryogenic conditions), specially designed triple or double eccentric butterfly valves with metal sealing and regulation devices are required.

Zhejiang Putian triple eccentric butterfly valve is suitable for applications requiring complete sealing, zero gas test leakage, high lifespan, and operating temperatures between -10°C and 150°C in pipelines handling freshwater, sewage, seawater, saline water, steam, natural gas, food, oil, various acids and alkalis, and other media.

Zhejiang Putian soft seal eccentric butterfly valve is suitable for bidirectional opening/closing and regulation in ventilation and dust removal pipelines, widely used in gas pipelines and water channels in metallurgical, light industrial, power, and petrochemical systems.

Zhejiang Putian triple eccentric metal-to-metal line seal double eccentric butterfly valve is suitable for urban heating, gas supply, water supply, and other pipelines handling gas, oil, acids, alkalis, etc., serving as regulation and throttling devices.

Zhejiang Putian triple eccentric metal-to-metal surface seal triple eccentric butterfly valve, in addition to being used as program control valves in large pressure swing adsorption (PSA) gas separation units, is widely applicable in petroleum, petrochemical, chemical, metallurgical, and power industries.

Working principle of Zhejiang Putian triple eccentric metal hard seal butterfly valve: A typical triple eccentric metal seal butterfly valve features two eccentricities in the stem and disc, with the sealing surfaces of the disc and seat forming an inclined conical shape (the third eccentricity). When closed, the disc is pushed forward due to eccentricity, avoiding friction during closure and ensuring direct pressure on the seat, thereby extending valve lifespan.

Additionally, the sealing ring (whether mounted on the seat or disc) of Zhejiang Putian valves has certain elasticity, with a small gap between the inner protrusion and the elastic ring allowing slight displacement. During closure, the elastic seal ring automatically adjusts to evenly distribute force, achieving sealing through minor deformation.

Performance variations of triple eccentric metal hard seal butterfly valves with different eccentric structures: Traditionally, butterfly valves were limited to常溫, low-pressure, and low-sealing applications.

With advancements in modern technology and materials, Zhejiang Putian butterfly valves now surpass previous limitations, replacing most traditional valves and widely used across industries. Triple eccentric metal seal butterfly valves are particularly notable.

Similar to gate valves, triple eccentric butterfly valves rely on torque for closure, with higher torque ensuring better seat sealing. Hence, they are sometimes called 90° rotating gate valves. In factory overhauls, triple eccentric butterfly valves increasingly replace gate valves, with some manufacturers producing triple eccentric butterfly valves matching gate valve dimensions, dubbing them triple eccentric gate valves.

As the number of eccentricities increases in Zhejiang Putian valves, disc thickness and fluid resistance also increase. Performance varies significantly with the number of eccentricities.

Comparison of four different butterfly valve structures shows that triple eccentric valves can achieve high pressure drops, suitable for use as control valves. Pressure drop increases with the number of eccentricities but remains lower than many non-butterfly valves. Seat sealing performance improves with eccentricity, and torque required for operation decreases, making triple eccentric valves easier to operate.

With changes in eccentricity, the temperature-pressure rating and applicable temperature range of butterfly valves also vary significantly. Triple eccentric butterfly valves offer the broadest range among butterfly valve types.

Advantages of triple eccentric butterfly valves: Excellent shut-off performance. Utilizing torque for closure, triple eccentric metal seal butterfly valves provide superior seat sealing, often termed zero-leakage valves. Solid particles or contaminants in the media have minimal impact on shut-off performance due to high flow velocity near closure preventing accumulation.

Features of metal hard seal butterfly valves:

1. Zhejiang Putian triple eccentric multi-layer metal hard seal butterfly valve features a disc seal ring composed of laminated metal sheets, combining the advantages of metal and elastic seals, ensuring excellent sealing performance across low and high temperatures.

2. Bushings installed on the upper and lower parts of the stem minimize wear and friction, preventing adhesion and extending service life.