Feature 1. The press-in sealing rubber is more durable than the sling type sealing rubber and has a longer duty cycle (filling and unloading air work duty cycle) 2. The discharge method at the bottom of the valve takes away the heating to cool the valve and prolong the service life. 3. At 85Ω higher resistance value, the amplifier and power consumption is really smaller, keeping the overall system cost and heating lower, saving energy. Of course the performance cost is better.