Patent ID: 6591868
Filing Date: 2003-07-15
Classification: F16K,Y10T

Abstract:
A food product machine positive control valve comprising:(a) a disassemblable food product valve housing having a detachable first piston chamber, a detachable second piston chamber, a vacuum inlet, a combination evacuating and venting outlet and a vent port; (b) a common evacuation and venting chamber connected by a first passage to said vacuum inlet and a second passage connected to said combination evacuating and venting outlet; (c) a first piston disposed in said detachable first piston chamber, said first piston having a substantially cylindrical elastomeric sealing end disposed intermediate said vacuum inlet and a tapered portion of said first passage disposed on said first passage on a side of said first passage opposite to said common evacuation and venting chamber; (d) a second piston disposed in said detachable second piston chamber, said second piston having a substantially cylindrical elastomeric sealing end disposed intermediate said second piston chamber and a tapered portion of said second passage disposed on a side of said second passage opposite to said common evacuation and venting chamber; (e) pneumatic means for activating said first piston to open and close said tapered portion of said first passage between said vacuum inlet and said common evacuation and venting chamber to positively control the position of said first piston both in an open position and in a closed position with air pressure; and (f) pneumatic means for activating said second piston to open and close said tapered portion of said second passage between said vent port and said common evacuation and venting chamber.