The butterfly valve is a simple regulating valve and can also be used for switching control of low pressure pipeline media. The ventilation butterfly valve produced by Yongjia County Tezhong Valve Factory is a non-closed butterfly valve. 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.
The ventilation valve of the special valve has several features:
1. It is convenient, quick, labor-saving, and has low fluid resistance. It can be operated frequently.
2. Simple structure, small size and light weight.
3, can transport mud, the least amount of liquid accumulated in the pipe mouth.
4, under low pressure, can achieve a good seal.
5, the adjustment performance is good.
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Door Viewers
The door observer is a small optical instrument installed on the door of a residence, which is convenient for residents to observe the outdoor situation. Has become a necessity for home safety.
It is composed of a concave lens (objective lens) and a convex lens. The focal length of the objective lens is extremely short, it makes the outdoor person or object into an upright and reduced virtual image, which falls just within the focus of the eyepiece, and finally a reduced upright virtual image is obtained, which is exactly at the clear viewing distance of the human eye. Nearby, you can see the situation outside the door clearly.
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