●Adopting a lifting design, the valve disc slides along the vertical centerline of the valve body and automatically opens/closes based on the pressure difference of the medium. The structure is compact and suitable for horizontal pipeline installation. It can still maintain flexible opening and closing in low temperature environments, ensuring normal flow of the medium.
●It can automatically open and close without external power, and achieve rapid response through the pressure difference of the medium. Support manual or electric operation, equipped with safety valves and leakage valves to ensure system safety.
◎ Material: Stainless Steel
◎ Nominal Size: NPS 1/2*~24*,DN15~600
◎ Nominal Pressure: Class 150~2500, PN10~420
◎ Applicable Temperature: -196℃~+150℃
◎ Operator: Manual, Pneumatic, Electric, etc...
◎ Application Range: LNG, LPG, LNG low temperature conditions and long-distance pipelines such as oil, gas, and natural gas.
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.
When the disc of the lift check valve slides along the vertical center line of the valve body and the medium flows forward, the disc is lifted by the fluid thrust and the medium passes smoothly; When the medium stops flowing or reverse flowing, the valve disc quickly closes under the action of its own gravity and the reverse thrust of the fluid to prevent the medium from flowing back. This valve is usually equipped with a guide sleeve to ensure that the disc remains smooth during lifting and accurately falls back onto the seat.
RAYS manufactures high-quality fully welded ball valves, forged from premium materials with side-mounted balls. The valves are available in two designs: cylindrical and spherical fully welded bodies. RAYS is particularly known for its cylindrical valve bodies.