METHOD OF MOULDING A BALL VALVE BY MOUNTING ELEMENTS HELD BY CORES CONSTITUTING TOOLS TO PRACTICE THE METHOD

摘要

In a valve (31) with a valve body (7) which is movably embedded in an inner valve housing (36) and which can be moved between the shown open position and a not shown closed position, one of the two parts sliding against each other when actuating the valve, namely the inner valve housing (36) and the valve body (7), is moulded against the other part. In a ball plug valve (31) preferably the inner valve housing (36) is as shown moulded around the ball plug (7) and within the outer valve housing (32). For moulding the said moulded part there is used a tool comprising partly two cores (50, 51) which may engage each its end of a flow passage (11) designed in a valve housing and being cylindrical in the open position of the valve and partly a plug (57) which may grip a control lever (15) on the valve body (7). There is thereby obtained a considerable simplification of the manufacture of the valve in that complicated operations by assembling many small parts and adjustment of packings are avoided.