VA series valve is an internal air guide stack valve. The valve is a stack valve with only the coil inserted. Valve can have 3/2, 5/2 single, double electromagnetic options. Each valve has a separate wire connection. A surge suppressor and LED display light are installed between coil and valve body. Internal pilot operation means that the supply pressure to the No.1 oil port is directed to the bottom of the valve, which is where the electromagnetic drive is located; The denier is driven, allowing pressure to pass through and then causing the spool to move.