PLUNGER-TYPE DISPENSING VALVE FOR THE RAPID DEPOSITION OF ADHESIVE TO ROAD PAVEMENT SURFACES FOR ENABLING THE FIXATION OF PAVEMENT MARKERS TO ROAD PAVEMENT SURFACES

摘要

A reciprocating plunger-type valve mechanism or assembly, which can be utilized in conjunction with adhesive dispensing applicators to control the dispensing of adhesive compositions which are to be used in connection with the bonding, securing, or fixation of pavement markers to road pavement surfaces, is disclosed. The mechanism or assembly comprises dual shutoff locations in connection with the supply of the incoming adhesive material so as to effectively reduce the prevailing pressure upon the shutoff blade controlling the adhesive material dispensing/discharge port whereby soft pressure starts and controlled deposition quantities are enabled while the generation of residual adhesive material or splatter is avoided.

主权项

1. A dispensing valve assembly for dispensing material,
a valve housing; a material inlet supply port; a material outlet recirculation port fluidically connected to said material inlet supply port; a material output dispensing/discharge port; a valve plunger reciprocally movable within said valve housing between first and second end movement positions and through at least one intermediate TRANSITION position; and a valve member mounted upon and operably movable with said valve plunger and operatively cooperable with said material output dispensing/discharge port so as to be seated within said material output dispensing/discharge port when said valve plunger is disposed at said first end movement position such that said dispensing valve is CLOSED, and to be unseated from said material output dispensing/discharge port when said valve plunger is disposed at said second end movement position whereby said dispensing valve is OPEN; wherein dual material shutoffs are defined at said material inlet supply port and at said material output dispensing/discharge port, respectively, by said valve plunger and said valve member for terminating flow of the material from said material input supply port and said material output dispensing/discharge port when said valve plunger and said valve member are moved from said second end movement OPEN position, through said at least one intermediate TRANSITION position, and to said first end movement position corresponding to said CLOSED position of said dispensing valve such that minimal pressure is exerted upon said valve member and prevails at said material output dispensing/discharge port when said valve plunger and said valve member are to again be moved to said second end movement OPEN position whereby soft pressure dispensing starts are enabled.