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US 5,287,890 AGranted
Directional gate valve
AssigneesMaatschap J. A. Grotenhuis c.s., De Van Mullekom Family Trust
InventorsJosef A. Grotenhuis, Arnold P. Van Mullekom
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AssigneesMaatschap J. A. Grotenhuis c.s., De Van Mullekom Family Trust
InventorsJosef A. Grotenhuis, Arnold P. Van Mullekom
Estimating the term…
In the present valve, the valve housing consists parts, namely a block (10) having a through-hole (11) which is preferably conical and a sleeve (20) which fits, with at least the essential part of its lateral surface, tightly and in a self-sealing manner in this hole and contains the cylindrical through-hole for the control piston (35) of the valve and, in its lateral surface, at least one groove (33 and 34) connecting to one another the two windows (27 and 29) furthest away from one another. This design makes it possible on the one hand for the connecting line between the two windows furthest apart to be produced in a substantially simpler manner than in the past. Since the life of a valve is limited by the leakage resulting from the wear between the slide and the longitudinal hole, in the valve according to the invention it is possible on the other hand, after leakage occurs, to replace the sleeve and the slide so that the expensive replacement of the entire valve can be dispensed with, permitting a substantial reduction in the maintenance costs.
A directional gate valve which can be used as a control element and consists of a housing and a control piston and in which the housing is formed from two parts, namely a block (10), provided with a through-hole having a circular cross-section and effective connections P, T, A and B transverse to said through-hole and entering the latter, and an integral one-piece sleeve (20) arranged in a conical through-hole (11), removable therefrom and provided with five windows coordinated with effective connections, the control piston (35) being mounted in an axially displaceable manner, wherein the sleeve (20) fits, with at least the essential part of its lateral surface, tightly and in a self-sealing manner in the through-hole (11) and has, in its lateral surface, at least one groove (33, 34) connecting to one another two windows furthest away from one another and the generating lines of the through-hole make an angle of 1.degree. to 4.degree. with the axis, the sleeve has two transverse holes ((31) and (32)) which are connected to a radial incision (26) via grooves ((33) or (34)), made in the conical lateral surface.
Dependencies are inferred from the claim text.