| 摘要 |
A thrust assembly for a valve is disclosed which has a bonnet (3) and a stem (7) for rotation in the bonnet. A collet (8) formed from two halves is arranged in the bonnet to secure the valve stem (7) in position and a housing (9) having a groove (30, 77) is provided for locking the collet (8) and therefore the stem (7) in the bonnet. The bonnet has a groove (32, 77) corresponding to the groove (32, 79) to form a passage so that a thrust element in the form of a rod (10) or a thrust pin (81) can be inserted into the passage to thereby retain the housing in place and lock the collet in position to in turn retain the collet (8) in position when thrust is applied by rotation of the valve stem (7). |
