PRESSURE SWITCH DEVICE

摘要

A pressure switch device (1) is disclosed in which an electrical switch (3) is operated when a fluid pressure (P) in a working pressure chamber (34) acting on an operating diaphragm (9) exceeds a limit value. A pivotally mounted T-shaped switch actuator (4) has its main limb extending generally along the longitudinal axis of the switch device when no fluid pressure is received in the working pressure chamber. A compression spring (5), when adjusted, acts against the indicator (4), thereby changing the resistance force acting against the fluid pressure (P) and therefore providing adjustment for the pressure limit value at which the pressure switch device responds. The switch (3) and the compression spring (5), are arranged on opposite sides of the T main limb, thereby providing a compact arrangement for the switch device. The main limb of the T-actuator includes a cantilevered actuating arm (40) which can be laterally deflected by a setting screw (52), for factory adjusting the position of an actuating part or operating tongue (22) of the switch (3) when no fluid pressure is admitted to the working pressure chamber (34).