advantages: double-acting cylinder is mainly used for air inlet control valve, easy to operate, flexible. Cylinder medium: compressed air, nitrogen. Simple structure, convenient manufacture and maintenance, small job schedule, opening and closing time is short. The valve body ( Disc) And seat sealing surface by cone seal, seal force is small, corrosion resistant, reliable seal. The seat can be replaced, and can be combined with any sealing material, in order to satisfy the requirement condition, prolong service life. 1. Simple structure, easy manufacture and maintenance. 2. The second step. Working stroke is small, start-stop time is short. 3. Good sealing, sealing surface friction small, long service life. 4. Pneumatic cut-off valve body structure for straight-through, once-through, right Angle type. Straight-through structure is the most common structure, but the fluid resistance is the largest. Dc small fluid resistance, mainly used for solid particles or high viscosity fluid. Rectangular body is usually forging, suitable for small size, high pressure cut-off valve. 5. In the process of opening and closing, sealing surface friction is less than gate valves, wearability. 6. Usually only a sealing surface, easy to maintenance and manufacturing. The advantage of use: 1. Double seal design ( Bellows + packing) If the bellows failure, will also avoid stem packing. 2. Leakage and to international standard for seal; 3. No fluid loss, reduce energy loss and improve plant safety; 4. Long service life, less maintenance, low operating costs; 5. Durable bellows seal design to ensure that the valve stem of zero leakage, and provide free maintenance conditions. Working principle: the cut-off valve opens, when the disc height is opened - 25% of nominal diameter 30%, reach maximum flow, valve has reached the full open position. Cut-off valve fully open position, therefore, should be decided by the disc of travel.

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