shown in the fig1 and fig2 a seal ring 40 is installed between the upper diaphragm seat 121 and the body 110 in order to protect the gas from leaking from between the upper diaphragm seat 121 and the body 110 as shown in the fig1 and fig2 in some embodiments of the invention the kicker pin 220 crosses through the coil 230 and the magnetic core 150 and the valve core component 20 also comprises a second diaphragm 240 the outer side of the second diaphragm 240 connects to the magnetic core 150 and the inner side of the second diaphragm 240 connects to the part of the kicker pin 220 crossing through the magnetic core 150 in other words both the first diaphragm 30 and the second diaphragm 240 support the valve core component 20 in order to improve the stability of the valve core component 20 during the movement along the up down direction and achieve higher precision and the better repeatability of the proportional valve 1 specifically as shown in the fig1 and fig2 the valve body 10 also includes a diaphragm support plate 160 the diaphragm support plate 160 being installed on the magnetic core 150 since the outer side of the second diaphragm 240 may be clamped between the magnetic core 150 and the diaphragm support plate 160 the second.