The effect of new automatic filter and pressure relief valve are intr.

It can simplify the fire supply system of highrise building by applying pressure relief valve to vertical compartment.

First, a mathematical model of the pressure relief valve is built, and then curves of the throttle area ratio of the pilot valve vs the pressure of the pilot valve cavity as well as its temperature are obtained by simulation, and the critical area ratio of the 2nd and 3rd grade air source is found to be 1.

Improving on the structure of pressure reducing valves used for oxygen collecting bar;

Simulation on reverse balanced pneumatic pressure reducing valve dynamic characteristic;