Liquid discharge system including liquid product pump having vibration sensor

A hydraulic discharge system for discharging a liquid product from a tank trailer of a tank truck, comprising:

• a hydraulic pump operably coupled to a power take-off (PTO) from the tank truck;
• a first hydraulic motor operably coupled to the hydraulic pump to receive fluid pressure produced by the hydraulic pump;
• a liquid product pump operably coupled to the first hydraulic motor to receive mechanical power produced by the first hydraulic motor;
• a vibration sensor operably coupled to the liquid product pump and operable for monitoring vibrations within the liquid product pump and for producing a vibration signal corresponding to a level of cavitation within the liquid product pump;
• a speed control module operably coupled to the vibration sensor and operable for receiving the vibration signal produced by the vibration sensor and for producing a speed control signal corresponding to the vibration signal;
• an actuator operably coupled to the speed control module and operable for receiving the speed control signal and for actuating the first hydraulic motor to adjust an operating speed of the liquid product pump;
• a second hydraulic motor operably coupled to the hydraulic pump to receive fluid pressure produced by the hydraulic pump;
• an air compressor operably coupled to the second hydraulic motor to receive mechanical power produced by the first hydraulic motor;
• a selection valve in fluid communication with the hydraulic pump and operable to select one of the liquid product pump and the air compressor to discharge the liquid product from the tank trailer of the tank truck;
• and
• a pressure sensor for measuring a flow rate and for producing a pressure signal corresponding to the flow rate through the liquid product pump;
• wherein the pressure signal produced by the pressure sensor operates to override the vibration signal produced by the vibration sensor and cause the speed control module to ignore the vibration signal produced by the vibration sensor that actuates the first hydraulic motor to adjust the operating speed of the liquid product pump.

A liquid discharge system for a tank truck, comprising:

• a hydraulic pump operably coupled to a power take-off (PTO) from the tank truck;
• an enclosure containing a liquid product pump and a first hydraulic motor operably coupled to the hydraulic pump for providing mechanical power to the liquid product pump, the enclosure further containing an air compressor and a second hydraulic motor operably coupled to the hydraulic pump for driving the air compressor;
• a selection valve in fluid communication with the hydraulic pump, the selection valve operably coupled to the liquid product pump and the air compressor, the selection valve operable to select one of the liquid product pump and the air compressor for discharging a liquid product from a tank trailer of the tank truck;
• a vibration sensor operably coupled to the liquid product pump for monitoring vibration within the liquid product pump and producing a vibration signal corresponding to a level of cavitation within the liquid product pump;
• a speed control module that actuates the first hydraulic motor to adjust an operating speed of the liquid product pump in response to the vibration signal corresponding to the level of cavitation within the liquid product pump;
• and
• a pressure sensor for measuring a flow rate and for producing a pressure signal corresponding to the flow rate through the liquid product pump;
• wherein the pressure signal produced by the pressure sensor operates to override the vibration signal produced by the vibration sensor and cause the speed control module that actuates the first hydraulic motor to adjust the operating speed of the liquid product pump to shut down.

A hydraulic discharge system for discharging a liquid product from a tank trailer of a tank truck, comprising:

• a hydraulic pump operably coupled to a power take-off (PTO) from the tank truck;
• a first hydraulic motor operably coupled to the hydraulic pump to receive fluid pressure produced by the hydraulic pump;
• a liquid product pump operably coupled to the first hydraulic motor to receive mechanical power produced by the first hydraulic motor;
• a vibration sensor operably coupled to the liquid product pump and operable for monitoring vibrations within the liquid product pump and for producing a vibration signal corresponding to a level of cavitation within the liquid product pump;
• a speed control module operably coupled to the vibration sensor and operable for receiving the vibration signal produced by the vibration sensor and for producing a speed control signal corresponding to the vibration signal;
• an actuator operably coupled to the speed control module and operable for receiving the speed control signal and for actuating the first hydraulic motor to adjust an operating speed of the liquid product pump;
• a second hydraulic motor operably coupled to the hydraulic pump to receive fluid pressure produced by the hydraulic pump;
• an air compressor operably coupled to the second hydraulic motor to receive mechanical power produced by the first hydraulic motor;
• a selection valve in fluid communication with the hydraulic pump and operable to select one of the liquid product pump and the air compressor to discharge the liquid product from the tank trailer of the tank truck;
• and
• a pressure sensor for measuring a flow rate and for producing a pressure signal corresponding to the flow rate through the liquid product pump;
• wherein the pressure signal produced by the pressure sensor operates to override the vibration signal produced by the vibration sensor and cause the speed control module that actuates the first hydraulic motor to adjust the operating speed of the liquid product pump to shut down.