Rectangular Pneumatic ventilation valve is a pneumatic valve of ventilation, air ventilation valve flange opening is square, general orders to press the inner diameter. Rectangular ventilation valve with welded steel manufacturing, with short structure size, light weight, easy installation, low flow resistance, high turnover, avoid high temperature expansion effects, easy operation. Expansion gap between the disc and the body is large, can effectively prevent stuck phenomenon caused by thermal expansion and contraction. Rectangular Pneumatic ventilation valve is a non-sealed butterfly valve, widely used in metallurgy, teacher of, electricity, building materials, mining and other industrial pipelines, gas control or gas for media regulation. Rectangular Pneumatic ventilation valve ten characteristics: 1, rectangular ventilation pneumatic valve double eccentric structure, with more and more tightly sealed off function, a reliable sealing performance. 2, sealing materials made of stainless steel and nitrile rubber with matching, long service life. 3, rubber seals can be located on the body can also be located butterfly board, applicable to the different characteristics of the medium for users to choose from. 4, the disc with frame structure, high strength, flow area, flow resistance. 5, rectangular ventilation valve pneumatic overall paint, can effectively prevent corrosion and replace the seal as long as the seat material, can be used in different media. 6, rectangular ventilation valve with two-way pneumatic sealing function, the impact of the installation from the media flow control, are not subject to spatial location can be installed in any direction. 7, a unique rectangular pneumatic ventilation valve structure, flexible operation, labor-saving and convenient. 8, is no link, bolts, etc., reliable, long service life. You can multi-site installation, the flow of influence from the media. 9, rectangle manual ventilation valve is designed for environmental dust ventilation duct design. Has the structure of short, light weight, simple structure, flow resistance is small, easy to open and close flexible maintenance. 10, rectangle manual ventilation valve is widely used in power plants, metallurgy, mine ventilation and dust and environmental protection, heating and ventilation in the gas line to make traffic regulation and control media use. The circular butterfly light butterfly, rectangular board, multi-board valve in the form of a rectangle. And make other lightweight ventilation valve according to user requirements. Botou City Friends of Mine Machinery Co., Ltd., is a screw conveyor, dust humidifier mixer, shaftless screw conveyor, screw conveyor, FU chain conveyor, bucket elevator, buried scraper conveyor, ventilation research, design, manufacture and sale of butterfly, star discharge and other equipment for the integrated enterprise. The company has a professional R & D talent and technology specialist, has rich material and human resources. Companies with customer site requirements using computer-aided drafting, and whom the selection based on customer needs, providing effective design solutions to meet customer requirements.