| 摘要 |
<p>An apparatus for actuating a proportioning valve is presented. The valve consists of a pair of registers, each register having a cut-out portion defining a variable area orifice which is generally symmetrical about a central longitudinal axis through the orifice. The registers are respectively connected to a first and second drive shaft, the drive shafts being mounted about a common axis and being mounted in bearings in a frame such that by pivoting about the common axis, the drive shafts will urge the registers to simultaneously move in opposite directions. Each of the two drive shafts are provided with an arm which are pivotably connected to a tilting lever via a connecting rod. The two tilting levers are mounted on a pivot shaft which is parallel to the common axis of the two drive shafts. The tilting levers are also connected to a driving device, i.e., a hydraulic jack which acts to pivot them about their pivot shaft so that the registers are simultaneously actuated in opposite directions. Preferrably, one of the tilting levers is a substantially straight bar while the other of the tilting levers is a bent bar, the pivot shaft being connected between about the center portion of the straight bar and the bend portion of the bent bar.</p> |
