| 摘要 |
<p>Single annular membrane type of pneumatic positioner associated with a servo control comprising a cylinder-piston assembly, feedback connected to the positioner, which includes a hollow body, internally of which there is provided at one side a reverse feedback spring controlled by the servo control, and at the other side a slide or distributing valve is provided, the inner cavity of the pneumatic positioner being separated by a single annular membrane, capable of being displaced under the action of an adjusting signal, said annular membrane being provided at the center with a hole through which a stem of the slide or distributing valve frictionessly slides, which stem bears against a dish-like member resting on the reverse feedback spring, while at the opposite side the slide or distributing valve bears on a low load spring.</p> |
