High vacuum die-casting technology has developed rapidly, and has been widely used in aerospace, weapons, ships, instruments, valve bodies, household appliances, automobiles and other industries. The core of high vacuum die casting technology is the innovative design of vacuum exhaust valve. By accepting the die casting machine's opening, closing and injection signals, the operation procedures of vacuuming, measuring vacuum degree and blowing compressed air to clean vacuum valve are completed to ensure that the alloy liquid is pressed and formed under vacuum. The products formed by this vacuum die-casting technology have strong toughness and strength, which can enhance the core...