Safety valve structure has two main categories: spring type and lever type. Spring type refers to the disc and seat seal by the force of the spring. The lever is the force of the lever and the hammer. With the need of large capacity, there is a pulse type safety valve, also known as pilot safety valve, by the main safety valve and auxiliary valve composition. When the medium pressure in the pipeline exceeds the specified pressure value, the auxiliary valve is opened first, the medium enters the main safety valve along the conduit, and the main safety valve is opened, so that the increased medium pressure is reduced.
The discharge of the safety valve is determined by the diameter of the seat and the opening height of the disc, which can also be divided into two kinds: the opening height of the micro-opening is the inner diameter of the seat (1/15) ~ (1/20), and the full-opening is (1/3) ~ (1/4).
In addition, there are closed and non-closed depending on the usage requirements. Closed discharge medium does not leak, all along the specified outlet discharge, generally used for toxic and corrosive media. Non-enclosed is generally used for non-toxic or non-corrosive media.
