Simultaneous control of multiple liquid level settings in a diaphragm valve, using a single rotatable control shaft

摘要

A method and apparatus are provided for simultaneously changing multiple liquid level settings in a liquid-level switch including a diaphragm actuated pressure switch apparatus having a first and a second switch, through use of an actuator apparatus including a single control knob shaft rotatably connected to the pressure switch apparatus and having a first and a second cam fixedly attached to the shaft for rotation therewith, the first cam being operatively connected to provide a biasing force against actuation of the first switch, and the second cam being operatively connected to provide a biasing force against actuation of the second switch.