The U-type butterfly valve is a butterfly valve type with the U-shaped valve body flow channel as its core feature. It optimizes fluid control performance through special structural design. Its technical points are as follows:
1. Core definition and structural characteristics
Construction principle
The U-type butterfly valve is designed based on the three-dimensional eccentric principle. The butterfly plate movement trajectory forms a progressive sealing contact with the valve seat. When closed, it achieves a tighter and tighter effect, and there is no wear interference on the sealing surface. The valve body has a U-shaped flow channel structure, which reduces fluid resistance and turbulent noise, and the flow efficiency is improved by 15%-20% compared with ordinary butterfly valves.
Key component design
Top-mounted structure: Under high-pressure and large-diameter working conditions, the design of installing the butterfly plate on the top of the valve body is adopted to reduce the number of valve body connection bolts and enhance overall reliability; Double sealing system: Two elastic sealing rings (EPDM or PTFE) are set between the valve seat and the butterfly plate to form a redundant sealing barrier; Reinforced butterfly plate: The edge of the butterfly plate is often covered with nickel-based alloy coating or nylon material to withstand the erosion of solid particle-containing media.
2. Performance Advantages
Adaptability to Special Working Conditions
The temperature range is extended to -196℃~600℃, and the pressure resistance level is up to PN100, which is suitable for harsh media such as high-temperature steam and coal gas;
The U-shaped flow channel design can transport slurry media containing up to 30% solid particles, and the valve seat wear rate is reduced by 40% compared with the V-shaped valve body.
Operational Efficiency
The three-dimensional eccentric structure reduces the opening and closing torque by 50%, and supports the rapid response of electric and pneumatic actuators (90° rotation time ≤10 seconds);
The leakage level meets the ANSI Class VI standard and is suitable for pharmaceutical and food-grade clean pipelines.
3. Typical Application Scenarios
Energy and Chemical Industry
Controlling the diversion/merging of syngas in coal gasification units, and withstanding high-temperature gas flow (450℃) containing 10% ash;
Ultra-low temperature cutoff of liquefied natural gas (LNG) pipelines, the valve body material is austenitic stainless steel + cryogenic treatment.
Environmental protection and infrastructure
Regulate the flow of circulating slurry in the desulfurization system, resistant to corrosive media with pH 2-11;
Balance control of steam pressure in urban heating pipe networks to avoid water hammer effect.
4. Selection and maintenance
Installation specification: Preferentially use clamp-type connection, flange surface parallelism deviation must be <0.2mm/m;
Maintenance cycle: Under conditions containing solid particle media, it is recommended to check the wear of the sealing surface every 8000 hours, and replacement is required if the thickness loss is >1.5mm.
U-type butterfly valves have shown significant technical advantages in high pressure, high wear and extreme temperature scenarios through flow channel optimization and material innovation.
