Molecular formula :
nature : Spring sent to the pressure and the valve was closed as a safety valve, valve seat. Similar to the angle-cut-off valve, pressure valve disk media at the bottom, when the medium pressure exceeding a specified value, the valve will be set up in the top to vent to the outside world. The compression spring change, change that is to compress the valve disk, and can adjust the pressure safety valve. To prevent casually adjusting spring, it is Seal device. The advantage of compact structure, accounting for a small position. But it will not work under high temperature.
Notice:Each item can have many explanations from different angels. If you want grasp the item comprehensively,please see below "more details data".