| 摘要 |
The invention pertains to a hygienic vacuum valve for use in sterile environments such as food processing, medical and pharmaceutical applications where a vacuum valve is advantageously utilized in situ on processing equipment to eliminate multiple vacuum lines and valves remotely located from the processing equipment. The novel evacuation valve and method for evacuating, providing a sterilized environment and then sealing the package is accomplished by utilizing a vacuum valve having a housing which accommodates a first piston for opening and closing a vacuum inlet ported to a vacuum outlet and a second piston disposed between the housing and the vacuum outlet for rapidly releasing the vacuum after the package has been sealed. The first and second pistons each preferably include a sealing head which seats in a tapered frusto-conical shaped seat for positively sealing the vacuum inlet and the vent port in the operation of the valve. |
