Designed and manufactured by a new structure of medium-line disc and short-structure steel plate welding, the ventilated butterfly valve is compact in structure, light in weight, easy to install, small in flow resistance, large in circulation, avoiding the influence of high temperature expansion, and easy to operate. Ventilation butterfly valve is used in the dusty cold air or hot air gas pipeline of ventilation, environmental protection engineering in chemical industry, building materials, power station, glass and other industries. It is used as a gas medium to regulate the flow or cut off the pipeline control device. This type of valve should generally be installed horizontally in the pipeline.
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 hard sealing butterfly valve seat is welded with a temperature-resistant and corrosion-resistant alloy material. The opening and closing is convenient, labor-saving, and the fluid resistance is small, and it can be operated frequently. The structure is simple, small in size and light in weight. Mud can be transported, and the soft-seal butterfly valve accumulates the least amount of liquid at the pipe port. A good seal can be achieved at low pressure. The adjustment performance is good.
The butterfly valve can be divided into a bias plate type, a vertical plate type, a slant plate type and a lever type according to the structure. According to the sealing form, it can be divided into two types: a relatively sealed type and a hard sealed type. The soft seal type is generally sealed with a rubber ring, and the hard seal type is usually sealed with a metal ring. According to the connection type, it can be divided into flange connection and clip type connection; the butterfly valve is simple in structure, small in size and light in weight, and the two-way pressure butterfly valve is composed of only a few parts. Moreover, it can be quickly opened and closed by only rotating 90°, and the operation is simple, and the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the disc is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics. The butterfly valve has two sealing types: a spring seal and a metal seal. Elastomeric sealing valve, the sealing ring can be mounted on the valve body or attached to the periphery of the disc.
Reprinted: Yongjia Tezhong Valve Co., Ltd. specializes in the production of metal hard seal butterfly valves, three eccentric butterfly valves, ventilation butterfly valves, flange butterfly valves and other products, the company website address:
Steel poles are commonly used to carry several types of electric power lines, distribution lines and lighting system. Distribution lines carry power from local substations to customers. They generally carry voltages from 4.6 to 33kV for distances up to 30 miles, and include transformers to step the voltage down from the primary voltage to the lower secondary voltage used by the customer. A service drop carries this lower voltage to the customer's premises.
Lighting Pole,Street Lighting Poles,Traffic Signal Light Pole,High Mast Lighting Poles
Yixing Steel Pole International Trading Co., Ltd , http://www.yx-steelpole.com