● Excellent fire and flame retardant performance: The valve is made of high-quality stainless steel, brass or Monel alloy and other materials, with good flame retardant and electrical conductivity.
● Oil-free design and cleaning requirements: All components are strictly degreased during the manufacturing process to ensure that there is no oil, the surface is smooth and no burrs, and the high cleaning standards for oxygen delivery are met.
● Compact structure, safe and reliable: the valve has compact design, fast heat transfer, easy operation, excellent sealing performance and long service life.
● Low torque operation: Valve with low torque design, flexible operation, reduce mechanical friction, reduce the risk of ignition.
● Fire safety Certification: compliant with API 607 and API 6FA fire safety standards.
Material: Carbon Steel, Stainless Steel, Alloy Steel
Nominal Size: DN10～DN400
Pressure Rate: ≤21MPa
Temperature Range: -29～200℃
Operator: Manual, Pneumatic,Electric, etc...
Application range: Oxygen with a dew point not exceeding -30 ℃ and a purity (volume fraction) greater than 23.5%
◎ Design Standard: GB/T12235,GB 50030-2013,JB/T12955
◎ Pressure Temperature Rate:GB/T12224
◎ Face to Face: GB/T12221
◎ Flange Standard: GB/T9113
◎ Butt Weld Standard: GB/T12224
◎ Fire Safe: API 607,API 6FA
◎ Pressure Test: GB/T26480
The Power Plant Check Valve has small fluid resistance, the medium channel inside the valve body is straight through, and the flow direction of the medium does not change when it flows through the check valve. The pressure self-tightening seal is used, and the two ends of the valve are usually welded. The valve flap closes quickly, the water hammer pressure is small, the body structure is simple, the production process is good, the sealing performance is good, and the sealing surface is less eroded when fully opened. A wide range of applications.
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.
RAYS cast steel check valves are designed and manufactured to provide maximum service life and dependability. All check valves meet the design requirements of American Petroleum Institute standard API600 & 6D.BS EN 13709 and generally conform to American Society of Mechanical Engineers standard ASME B16.34. Valves are available in a complete range of body/cover materials and trims.