人妻中出无码一区二区三区_免费超爽大片黄_国产激情久久久久影院小草_日韩精品无码免费一区二区三区_亚洲欧美中文日韩V日本_人妻少妇一区二区三区_亚洲AV色香蕉一区二区三区_五月婷婷久久

1. The butterfly valve has novel design structure, small overall size and light weight.

2. The butterfly plate adopts double eccentricity, which can be opened and closed quickly, and the operation is light and labor-saving.

3. The butterfly plate adopts double eccentricity, so that there is no sliding friction between the butterfly plate and the sealing ring, which is sealed Wear resistance, long service life, reliable sealing and easy adjustment.

Rotate the handwheel of the butterfly valve, and drive the valve rod and butterfly plate to rotate freely within 90 degrees through the worm gear, so that the butterfly valve is in the open or closed state, so as to achieve the purpose of connecting or cutting off the medium.