penstock, or flat gate valve, valve … are usually made of stainless steel combines Super durable polymer plastic HDPE or completely made of steel. Operating under the resources off the slide up and down, close the open a manhole top or plumbing. Rotation axis is controlled by or associated with moto drivers open close operation of the gate.
Van door fading is usually applied in water supply and drainage works, water moderator. Small size type valve is often the application for protection, shielding the drainage Portal aims to protect ngặn prevent garbage, object from entering the inside of the pipe. Large size valve used to build these dams regulate or the portal screen filter in water supply plants 1.
Due to work in the environment, the waste water contains many hazardous chemicals should van door fade must be made from stainless steel or plastic material to ensure durability of works, in addition to regular hygiene maintenance.