The self discharging valve seat (Figure 1) is also called the upstream sealing automatic pressure relief valve seat. Upstream sealing means that the upstream valve seat plays a sealing role when the gate is used. When the pipeline is under low pressure or no pressure, the spring set at the back of the valve seat provides the initial sealing preload to ensure the sealing performance under this state. When the pipeline is under normal pressure, the upstream valve seat is pushed to the spherical surface by the medium pressure to form a seal. Automatic pressure relief means that when the pressure in the middle chamber of the valve rises (usually 1.33 times higher than the nominal pressure according to API6D), the pressure in the middle chamber reverses the valve seat,

Electromagnetic flowmeter has a wide range of applications. It is an instrument to measure the flow of conductive fluid according to the principle of electromagnetic induction and the aerodynamic force generated when the conductive fluid passes through an external magnetic field. Now let's learn some knowledge about electromagnetic flowmeter;