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LINUO Valves Butterfly Valves


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LINUO Valves butterfly valve catalog.

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LINUO Valves Butterfly Valves

  1. 1. The Linuo butterfly is a quarter-turn valve suitable for both on/off and throttling service. The triple offset design offers torque seating for tight shut off and minimal friction. Where traditional butterfly valve discs are in contact with the seat throughout the first 10 degrees of opening, the triple offset means that as soon as the valve begins to open, the disc surface moves away from the seat. Less friction means not only less wear, but also less torque, and longer life. Linuo valves are used extensively in industries such as pulp and paper, chemical processing, petroleum, chemical fiber, powder processing, pharmaceutical, and environmental protection. Butterfly valves by their nature have a small face-to-face dimension and are much lighter in weight than equivalent service ball valves. Less metal means butterfly valves are a much more economical option than ball valves. SEAL DESIGN OPTIONS Various seat seal designs are available: resilient metal seal, laminated metal seal, and PTFE seal. The type of seal to be selected is dependent on the specific process and shut off requirements. The upper and lower shafts are held by double bearings that provide excellent stability and low torque. Bearings are made of a composite plastic material that is sintered on the loading surfaces to make them abrasion resistant and improve the self-lubricating aspect. The disc of the triple-offset design butterfly valve is torqued into the seat. This is a significant advantage over standard butterfly valves where the disc can spin 360º, and seating only takes place when the disc is perfectly aligned with the body seat centerline. The torque in seat of the Linuo means tight shutoff is easily achieved, even at low differential pressures or with reverse flow. FIRST OFFSET: Shaft centerline is offset from that of the valve and the pipe. SECOND OFFSET: Shaft is offset behind the disc face. THIRD OFFSET: Disc sealing surface of the disc is offset in the shape of an oblique cone. The first and second offsets, ensure that at the moment of the valve opening, the disc is instantly removed from contact with the body seating surface. Without contact at that point, abrasion and torque are low. The third offset means that the disc sealing surface is similar to an oblique slice taken out of a metal cone. This produces a separation angle between the tangent of the disc motion curve and the body sealing surface. It enables uniform pressure sealing around the entire sealing surface, for the best shutoff.
  2. 2. Sizes: 2" through 48" Pressure Class: ANSI 150 and ANSI 300 End Connections: Lug, Wafer, or Flanged Temperature Range: For soft seat: -4ºF to 320ºF, For metal seat: -4ºF to as high as 800ºF Face-to-face Dimensions: Per GB/T12221 Leakage: For soft seat: zero leakage, For metal seat: Class V Pressure Testing: Each Linuo valve undergoes Hydraulic testing with 1/5 X pressure rating for the shell test, and 1.1 X pressure rating for the seat tightness test. Testing medium is water. Flow Characteristic: Approximately equal percentage. NOTE: ZSQ and ZDQ series actuators are developed and manufactured by Linuo. For actuator particulars, please refer to the Z Series Piston Actuator Catalog or consult Linuo. The actuators above are recommended for Class 150 valves with process pressure of 232 psi and normal temperature, with a minimum air supply pressure of 72 psi. For actuator selection for operation at different process conditions, consult Linuo.