Action and function
Character
Fast action speed
Principle of shutdown is that piston and valve is connected by lever. When molten metal collides on piston, piston and valve will be backward at the same time. Both NVV and SVV series share the same shutdown principle.
Easy to do maintenance
It is unnecessary to dismantle mold while do maintenance of valve. The main part of maintenance includes exchange the consumption parts like piston, valve, piston bush and valve bush.
Vacuum suction・Molten metal shutdown structure
Vacuum suction starts before injection of molten metal and finishes before molten metal comes into cavity of mold.
Explanation of vacuum valve structure and action summary
| 1 | After mold is closed, the lock of valve and piston is relieved and gets ready to do vacuum suction. |  |
|---|---|---|
| 2 | Gas of cavity discharges from the gate which connects valve and mold liner. When molten metal collides on piston, valve is backward at the same time. |