Safe closing skills of river valves

This video shares the safe closing skills of river valves, the core of which is using woven bags for sealing and leak prevention, with simple and efficient operation. First, lay a woven bag flat at the valve opening to ensure it covers the junction of the valve and the opening. When the river water comes into contact with the woven bag, it will seep into the bag, making it full and heavier, and firmly attached to the valve opening without displacement. Then put the valve cover and press it down at a constant speed. The wetted woven bag is soft and tough, and can closely fit irregular gaps and water leakage points. With the pressure of water, the woven bag is firmly pressed against the opening, effectively preventing the internal water from seeping out and completing the safe closing. Note: The woven bag must be laid flat, and the valve cover should be put down gently; for larger gaps, multiple layers of woven bags can be laid overlappingly.