Many valves are directional, such as globe valves, butterfly valves, pressure reducing valves, check valves, etc. If it is installed backwards, it will affect the use effect and service life, or it will not work at all, and even cause danger. Ordinary valves have direction marks on the valve body; otherwise, they should be correctly identified according to the working principle of the valve. The cavity of the globe valve is asymmetrical. The fluid should pass through the valve port from bottom to top, so that the fluid resistance is small, the opening is labor-saving, and the maintenance is easy after the medium is not pressed and the packing is closed. This is also the reason why the shut-off valve cannot be reversed. Other valves also have their own characteristics.Many valves are directional, such as globe valves, butterfly valves, pressure reducing valves, check valves, etc. If it is installed backwards, it will affect the use effect and service life, or it will not work at all, and even cause danger. Ordinary valves have direction marks on the valve body; otherwise, they should be correctly identified according to the working principle of the valve. The cavity of the globe valve is asymmetrical. The fluid should pass through the valve port from bottom to top, so that the fluid resistance is small, the opening is labor-saving, and the maintenance is easy after the medium is not pressed and the packing is closed. This is also the reason why the shut-off valve cannot be reversed. Other valves also have their own characteristics.