| 摘要 |
A fluid flow control valve comprises a valve plug assembly (8) which is connected to a valve spindle (11) and which can be moved axially between a closure position in which it seats against a valve seat (2a) and a valve open position. The plug assembly comprises two main parts (9, 10), namely a hollow cylindrical body (9) and a plug slide (10) which is accommodated in the hollow cylindrical body (9). The cylindrical body (9) and the plug slide (10) have provided thereon, over an arcuate region which is smaller than the circumference thereof, port orifices (17, 18) which can be placed in different positions relative to one another, such as to vary the flow of fluid through the valve in a given valve-open position, and therewith also the capacity value of the valve. The plug slide (10) is connected to the spindle (11), by means of which the plug slide can be rotated to a selected one of, e.g. ten mutually different positions. The moveable part (10) of the plug assembly can be locked temporarily in relation to the fixed valve part (8) in the selected position of rotation, which is indicated on a scale (24). |
