| 摘要 |
The controller has a diaphragm box comprising a spring-biassed diaphragm rod (20). The pressure prevailing in a control pressure chamber (S) of the box is controlled by the provision of two electromagnetic valves (34, 36) in the box which reduce delays in response and line losses. In addition, the valves and the control pressure chamber are designed to have the least possible dead space. In order to obtain optimum resolution, the diaphragm rod guide (22) which is preferably based on polytetrafluoroethylene, provides the least possible difference between static and sliding friction. The valves are preferably mounted firmly in receiving pockets (38, 40) and are in the form of quick-response, low- mass hinged armature valves. An electromechanical position repeater (46) coupled for movement with the diaphragm is integrated with contact springs in the diaphragm box and is also mounted in a receiving pocket (48). <IMAGE> |
