Fuel or DEF dispenser having fluid temperature conditioning and control system

A fluid dispenser for dispensing fluid from at least one fluid storage tank into a vehicle, comprising:

• a housing in which fluid flow control components are located;
• a control system;
• a first fluid conduit completing a first flow path between said at least one fluid storage tank and a nozzle coupled to said housing;
• a second fluid conduit completing a second flow path between said nozzle and said at least one fluid storage tank;
• at least one controllable valve located along said second flow path;
• wherein the temperature of flowing fluid is conditioned upstream of a fluid flow meter inside said fluid dispenser housing, the fluid is diesel exhaust fluid and or liquid fuel;
• and
• said control system is adapted to selectively actuate said at least one controllable valve such that said flowing fluid flows to said at least one fluid storage tank when said fluid dispenser is not in use.

A fluid dispenser for dispensing fluid from at least one fluid storage tank into a vehicle, comprising:

• a housing in which fluid flow control components are located;
• a control system;
• a first fluid conduit adapted for fluid communication with a nozzle, said first fluid conduit completing a first flow path through said fluid dispenser;
• a second fluid conduit adapted for fluid communication with said nozzle, said second fluid conduit completing a second flow path through said fluid dispenser;
• a junction at which said first fluid conduit and said second fluid conduit are in fluid communication with each other, said junction being spaced apart from said nozzle;
• said junction further defining an inlet for fluid communication with said at least one fluid storage tank;
• a valve in fluid communication with said inlet upstream of said junction;
• and
• a recirculation pump coupled to said second fluid conduit;
• said control system being operative to actuate said valve and said recirculation pump such that fluid recirculates through said housing when said fluid dispenser is not in use, wherein the fluid is diesel exhaust fluid and or liquid fuel.

A fluid dispenser for dispensing a first fluid from at least one fluid storage tank into a vehicle, comprising:

• a housing in which fluid flow control components are located;
• a control system;
• a first fluid conduit completing a first flow path between said at least one fluid storage tank and a nozzle;
• a second fluid conduit completing a second flow path between said nozzle and said at least one fluid storage tank;
• a first controllable valve located along said first flow path;
• a fluid inlet for an evacuation fluid, said fluid inlet located along said first flow path downstream of said first controllable valve;
• and
• a recirculation pump coupled to said second flow path;
• said control system being operative to close said first controllable valve and cause a first fluid to be evacuated from said first and second fluid conduits when said fluid dispenser is not in use by a flow path from said first fluid conduit to said second fluid conduit and back to said at least one fluid storage tank, wherein the fluid is diesel exhaust fluid and or liquid fuel.

A method of measuring the flow rate of a fluid in a fluid dispenser for dispensing fluid to a vehicle in a fueling environment, comprising the steps of:

• providing a fluid dispenser defining a fluid conduit connectable to a fluid flow path between at least one fluid storage tank and a nozzle coupled to said fluid dispenser;
• providing a fluid flow meter located along said fluid flow path;
• providing a fluid temperature conditioning subsystem positioned in housing of said fluid dispenser, said fluid temperature conditioning subsystem located along said fluid flow path upstream of said fluid flow meter and downstream of a shear valve;
• measuring the temperature of said fluid;
• comparing the temperature of said fluid to a predetermined temperature;
• and
• if the temperature of said fluid differs from said predetermined temperature, conditioning the temperature of said fluid upstream of said fluid flow meter, wherein the fluid is diesel exhaust fluid and or liquid fuel.