Valve arrangement for intermittent application of a fluid adhesi

Details Valve arrangement for intermittent application of a fluid adhesi Valve arrangement for intermittent application of a fluid adhesi

1989-01-27

1991-02-05

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Including valve means in flow line

Reciprocating

251 31, B05B 130

Patent

active

049897926

ABSTRACT:
A valve arrangement for intermittent application of a liquid adhesive, in particular a thermoplastic high-polymer material, to a substrate comprises a valve body with a bore therein terminating in an outlet nozzle, a conduit for supplying the adhesive to the bore, a valve needle reciprocable in the bore for opening and closing the outlet nozzle and a step or differential piston connected to the valve needle. The lower surface of the differential piston faces the outlet nozzle and is smaller; it is subjected to a permanently applied gas pressure which brings the valve needle into the opened position. A controllable, usually constant gas pressure applicable via a solenoid valve acts on the upper larger surface of the differential piston; and upon subjection of the differential piston to the gas pressure, the gas pressure overcomes the force generated by the continuously applied, permanent gas pressure and brings the valve needle into the closed position.

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