Remotely operable cap assembly for a tanker trailer

A tanker trailer for transporting liquid materials, comprising:

• a tank comprising an external fixture;
• a hydraulic system operatively associated with the tank;
• and
• a cap assembly, comprising:
• a collar configured to secure the cap assembly to the tank external fixture and defining a collar opening aligned with an opening of the external fixture;
• a lid that is moveable between a closed position where the lid covers the collar opening and is in sealing engagement with the collar and an open position where the lid is vertically raised and pivoted laterally away from the collar opening;
• and
• an actuator assembly comprising a piston disposed in a cylinder, wherein movement of the piston effects movement of the lid from the closed position to the open position, wherein the piston is biased toward a bottom of the cylinder and when so biased the lid is biased in the closed position,
• wherein the hydraulic system is configured to permit operation of the actuator assembly from a location off of the tank.

A cap assembly for attachment to an external fixture on a tank of a tanker trailer, comprising:

• a collar configured to secure the cap assembly to the tank external fixture and defining a collar opening concentrically aligned with an opening of the fixture;
• a lid that is moveable between a closed position where the lid covers the collar opening and is in sealing engagement with the collar and an open position where the lid is vertically raised and pivoted laterally away from the collar opening;
• and
• an actuator assembly comprising a piston disposed in a cylinder, wherein movement of the piston effects movement of the lid from the closed position to the open position during a single stroke of the piston, wherein the piston is biased toward a bottom of the cylinder and when so biased the lid is biased in the closed position;
• and
• wherein the actuator assembly is configured to be remotely operable from a location off of the tanker trailer.