Liquid or gas pressure regulating system - uses measurement of power absorbed by compressor motor to indicate instantaneous pressure of fluid

摘要

The system is designed to regulate non atmospheric pressures which are created or maintained by at least a motor (7) driven pump (3). The system has a device for controlling the pumps motor, and a circuit which automatically measures the load (absorbed power) of the pump motor during its operation. The load measurement is used for indirect measurement of the instantaneous pressure state in a pressure container (1). The system has a valve which is designed to limit the pressure difference from atmospheric. This valve is actuated by the load measuring circuit. A further circuit is used to stop the pump by mechanical or electrical decoupling of the motor from the pump.