Valves and valve actuation – Rotary valves – Ball valve
Patent
1985-12-17
1987-10-06
Chambers, A. Michael
Valves and valve actuation
Rotary valves
Ball valve
251151, 1374542, F16K 506
Patent
active
046977872
ABSTRACT:
A ball valve made entirely of plastics material comprising a tubular casing with connection pieces which are fastened to both its ends and which together form a through passage for a medium, a ball disposed in the through passage inside the casing and provided with a through opening, operating means formed by a spindle inserted into an opening in the casing, cooperating with the ball, and provided with an operating grip to enable the ball to be turned so as to close or open the through passage. The casing consists of a substantially cylindrical outer casing to each end of which the connection pieces are welded, and of an inner casing disposed therein. The inner casing being constructed of two parts each of which having a seat. Both parts are connected by means of a screwthread and enclose the ball in between them. The inner casing at each end being provided with an external cylindrical surface projecting out of the outer casing each of said surface cooperating with an internal cylindrical surface on the two connection pieces to form a guide for these connection pieces.
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Chambers A. Michael
Fox John C.
Jaskiewicz Edmund M.
Nederlandse Industriele Maatschappij Nefit B.V.
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