Structural features of air duct ventilation butterfly valve 1. Designed and manufactured by adopting a new structure of medium-line disc plate and short-structure steel plate welding, compact structure, light weight, easy installation, small flow resistance, large circulation, avoiding the influence of high temperature expansion, operation Lightweight 2, no connecting rods, bolts, etc., reliable operation and long service life. Can be installed in multiple stations, independent of media flow
working principle:
The ventilating butterfly valve is driven by the motor to drive the actuator, so that the disc can rotate freely within the range of 90° to achieve the purpose of opening and closing or regulating the flow of the medium. At present, the fluorine-lined butterfly valve and the rubber-lined butterfly valve have been widely used in many fields such as petroleum, chemical, metallurgy, and hydropower as a component for implementing the on-off and flow control of the pipeline system. In the well-known butterfly valve technology, the sealing form is mostly sealed, and the sealing material is rubber, polytetrafluoroethylene or the like. Due to structural limitations, it is not suitable for industries such as high temperature resistance, high pressure, corrosion resistance and wear resistance. A relatively advanced butterfly valve is a three-eccentric metal hard sealing butterfly valve. The valve body and the valve seat are connected members, and the sealing surface layer of the valve seat is welded with a temperature-resistant and corrosion-resistant alloy material.
The multi-layer soft stack sealing ring is fixed on the valve plate. Compared with the traditional butterfly valve, the butterfly valve has high temperature resistance, light operation, no friction in opening and closing, and the seal is compensated with the increase of the torque of the transmission mechanism when closing, and the butterfly valve is improved. The sealing performance and the advantage of extending the service life. Ventilation butterfly valve classification construction, installation points 1), installation position, height, import and export direction must meet the design requirements, pay attention to the direction of the medium flow should be consistent with the arrow direction of the valve body, the connection should be firm and tight.
The visual inspection must be carried out before the valve is installed. The nameplate of the valve should comply with the current national standard "General Valve Mark" GB12220. For valves with a working pressure greater than 1.0 MPa and a shut-off function on the main pipe, the strength and rigorous performance tests shall be carried out before installation, and shall be used after passing the test. In the strength test, the test pressure is 1.5 times the nominal pressure, the duration is not less than 5 min, and the valve casing and the packing should be free of leakage. In the rigorous test, the test pressure is 1.1 times the nominal pressure; the duration of the test meets the requirements of GB50243.
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The Product of Caijian Plastic Masterbatch Co. was used the new technology Product and the Special Production Prosess, and add les 1--2%, 8--10 square of product surface resistance of up to 10, It does not affect the transparencey of Products, and can make the Product surface smooth and bright.It has good effect on the surface dustproof of the products. This product has good antistatic effect, long lasting effect, good dispersibility, small amount of adding, no toxic substance.
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