초록 ▼

A dispensing valve suitable for food processing and other applications has a valving plunger formed as an integral part of a pneumatic piston. A valve seat receives the plunger end of the piston to perform a valving operation. The remainder of the piston includes chambering for pressurized air flow,

A dispensing valve suitable for food processing and other applications has a valving plunger formed as an integral part of a pneumatic piston. A valve seat receives the plunger end of the piston to perform a valving operation. The remainder of the piston includes chambering for pressurized air flow, moving the piston back and forth so as to operate the valve between closed and open positions.

대표청구항 ▼

[ What is claimed is:] [1.] A valve and valve operator apparatus, comprising:a housing having a first end with a valve seat and a second end, and a housing wall therebetween;a valve assembly including a piston having a first end with a plunger for engaging the valve seat to block flow therethrough,

[ What is claimed is:] [1.] A valve and valve operator apparatus, comprising:a housing having a first end with a valve seat and a second end, and a housing wall therebetween;a valve assembly including a piston having a first end with a plunger for engaging the valve seat to block flow therethrough, a second end and a piston wall therebetween;a sealing ring outwardly extending from the piston wall;a cylinder surrounding said piston, having a fist end adjacent said valve seat and a second end remote from said valve seat;a mounting means for mounting the cylinder about said piston;first signal connection means for connecting a first pressure signal between said sealing ring and the second end of said cylinder;second signal connection means for connecting a second pressure signal between said sealing ring and the first end of said cylinder;at least a portion of said piston movable back and forth in said cylinder with pressure signals alternately applied to said first and said second signal connection means, whereby said plunger is moved into and out of engagement with said valve seat; andwherein said sealing ring is L-shaped cross-section with one leg of the L extending along the cylinder wall in sliding sealing contact therewith.