| 摘要 |
<p>The valve device comprises a housing (1), a vent channel (5) disposed in a vent valve of a cylinder, a vent located in the channel, and a guided plunger (7) serving as an operating device to open and close the vent valve. The operating device is recoverable at a disc spring supported on the housing, and is provided with a pressurized air operating device. The plunger includes a closure head (8) at its locking end. An annular recess of the plunger acts as a part of the vent channel. The valve device further comprises pressurized air channels arranged in the housing. The valve device comprises a housing (1), a vent channel (5) disposed in a vent valve of a cylinder, a vent located in the channel, and a guided plunger (7) serving as an operating device to open and close the vent valve. The operating device is recoverable at a disc spring supported on the housing, and is provided with a pressurized air operating device. The plunger includes a closure head (8) at its locking end. An annular recess of the plunger acts as a part of the vent channel. The valve device further comprises pressurized air channels arranged in the housing. The pressurized air channel is opened for supplying pressurized air for a short time into the vent channel during the opening the valve device. The annular recess is formed as a cross-sectionally arc-shaped recess. The pressurized air channel opens the arc-shaped recess in the proximity of the valve head end. The pressurized air channels are evenly distributed around the annular recess. A lubricant mist is added to the pressurized air, which is supplied to the pressurized air channel. An independent claim is included for a method for ventilation of molds of a metal pressure casting machine.</p> |
