● The dual-plate wafer check valve consists of a valve body, discs, shaft, and springs, featuring a wafer-style connection for a compact structure.
● The butterfly plates are two semicircles, using spring-forced resetting. The sealing surfaces can be made from wear-resistant material welded onto the body or lined with rubber, offering a wide range of applications and reliable sealing.
● The closing stroke of the valve disc is short, and it is spring-loaded for quick closure, which can significantly reduce water hammer phenomena.
● Suitable for installations in spaces with limited access; it can be used in both horizontal and vertical pipelines and is easy to install.
● Applicable for various mediums including water, steam, oil products, nitric acid, acetic acid, and strong oxidizing agents.
● The product features a small size, light weight, sensitive action, reliable sealing, easy installation, and a long service life.
◎ Design Standard: API 6D, ASME B16.34, GB/T 12236
◎ Pressure Temperature Rate: ASME B16.34, GB/T 12224
◎ Face to Face: ASME B16.10, GB/T 12221, EN558
◎ Flange Standard: ASME B16.5, ASME B16.47, GB/T 9113, JB/T 79, HG/T 20592, EN 1092, GOST 33259
◎ Fire Safe: API 607
◎ Pressure Test: API 598, API 6D, GB/T 13927, JB/T 9092, GOST 9544
Material: Carbon Steel, Stainless Steel, Alloy Steel
Nominal Size: NPS 2"~ 64", DN 50~1600
Pressure Rate: Class 150~2500, PN 10~420
Temperature Range: -46°C~+200°C
Application range: Suitable for pipelines in various working conditions such as petroleum, chemical, pharmaceutical, fertilizer, power industry, and low temperature.
The working principle of the three eccentric butterfly valve is based on its unique structural design, which achieves sealing and flow control functions through three eccentric distances: Structural Design: Three Eccentric Structure: The valve stem axis deviates from the center of the butterfly plate and the body center, and the rotation axis of the valve seat is at an angle to the axis of the valve body channel. This design enables the butterfly plate to form a wedge-shaped space with the valve seat when closed, achieving sealing through friction. Conical Sealing Surface: The periphery of the butterfly plate is machined into an external inclined conical surface, and the valve seat is an internal inclined conical surface, forming an elliptical contact surface. When closed, the butterfly plate achieves sealing through the asymmetric pressing force in the up and down directions, and the sealing becomes tighter as the pressure increases. Working Mechanism: Open State: The butterfly plate is separated from the valve seat, and the fluid passes through the channel; due to the eccentric design, during the opening process, the butterfly plate gradually detaches from the valve seat, reducing friction and operating torque. Closed State: The butterfly plate rotates 90° to contact the valve seat, forming a wedge-shaped space and achieving sealing through torque. Flow Regulation: During the opening rotation of the butterfly plate, the valve's flow area gradually increases, reducing fluid resistance and improving the flow coefficient, achieving flow regulation. Technical Advantages: Sealing Performance: The metal-to-metal hard sealing method can still maintain good sealing performance in high-temperature and high-pressure environments; Low Friction Operation: The eccentric design significantly reduces the operating torque and extends the valve's lifespan; Self-Locking Function: When closed, the butterfly plate becomes tighter under pressure, preventing the phenomenon of over-positioning. This valve is widely used in the petroleum, chemical, and power industries, and common structural connection forms include double flange type, welding type, lug type, and socket type, etc.
There is an oil groove between the valve body and the sealing surface of the pressure-balanced plug valve, and sealing grease can be injected into the valve seat through the oil nozzle at any time to improve the sealing performance. The material of the parts and the size of the flange can be reasonably selected according to the actual working conditions or user requirements to meet various engineering needs.
Designed specifically for industrial ventilation and gas transportation systems, it features a high-strength carbon steel or stainless steel valve body, equipped with a low-torque sealing structure, enabling efficient regulation of large flow of gas media. The optimized butterfly plate design is combined with wear-resistant sealing rings, ensuring reliable performance under harsh conditions such as high temperatures and dust. It is suitable for ventilation and dust removal systems in industries such as power plants, metallurgy, and chemical engineering