| 摘要 |
<p>A control valve comprising; a wall defining a chamber, the chamber having an inlet end (8) a middle portion (48) and an outlet end (46) in axial alignment, a valve seat (16) and a valve plug (4, 21, 20, 19, 11) proportioned to fit the valve seat (16) arranged in axial alignment within the chamber and at least one of the valve seat (16) and valve plug (4, 21, 20, 19, 11) configured for axial movement towards the other, relative movement between the valve plug and valve seat being enabled by means of a cam mechanism comprising, a first shaft assembly (14, 15, 28) extending axially along the chamber and fixed to one of the valve plug (4, 21, 20, 19, 11) and vlave seat (16), a cam (24) operable with the first shaft assembly (14, 15, 28) to separate or draw together the valve seat and valve plug along the axis of the chamber, a second shaft assembly (2) coupled to the cam (24) and extending through the middle portion (48) of the chamber wall terminating in a free end, the free end being configured for attachment to a rotary actuator (50). The novel control valve can be made pressure independent by enclosing in a common valve body in line with and in-line differential pressure controller.</p> |
