As applications for rectangular gate valves keep getting larger, Kurt J. Lesker is meeting the demand by offering wider rectangular valve openings commonly used for solar panels, semiconductor processing, LCD/flat panel and other applications. The new valves are rated up to 2 million cycles and available with 200 mm through 2,000 mm openings. These rectangular valves are proven ideal for vacuum applications which require large valve openings. The bellows-sealed rectangular gate valves feature a patented L-Motion link assembly and dual shafts without springs in the actuator to enable faster, smoother actuation with significantly reduced vibration. This design also results in less wear, less particulate generation and faster cycle times. The dust seal on the vacuum side of the bonnet flange virtually eliminates process particulate from entering the bellows, leading to long cycle life. Our valves feature mechanical locking, so that at the end of blade travel during valve closure, the valve locks into position. The benefit of this design is that any back pressure on the gate will not affect sealing properties. Our design has a proven track record of having greater ability to handle backpressure: between 15 % to 30 % greater than the competitors product. Also, upon loss of operating air pressure, our valves remain shut – a more reliable design feature, compared to valves which use check valves in the air-supply line. With ease of service in mind, our bonnet flange bolts are designed with retainers to eliminate bolts falling out upon disassembly.
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