Embodiments of a propane tank valve are provided. In one embodiment, the propane tank valve includes a plug with a tapered portion, the plug moveable between closed and open positions relative to a valve passageway. Upon the plug being in the closed position, the tapered portion of the plug is positioned within the valve passageway. Upon the plug being initially moved from the closed position to the open position, the tapered portion of the plug is sized and configured to initially minimize the gas flow from the valve passageway and through a flow limiting device configured to be coupled to the propane tank valve such that movement of the tapered portion from the closed plug position initially forms a gap between a tapered surface of the tapered portion and an internal surface of the valve passageway.

An overfill protection device includes first and second bodies, a piston slidably mounted within the first body, a spring arranged within the first body and fitted over an intermediate portion of the piston, first and second O-rings respectively fitted in first and second neck portions of the piston, a spindle arranged within the second body and located under the piston, a rod having a cam plate abutted against the spindle, and a float fixedly connected with a lower end of the float rod, whereby no fluid will be allowed to flow through the overfill protection device when the pressure within the vessel exceeds a predetermined level. The first and second bodies are made of plastic and bonded with each other via high frequency welding to prevent a pressurized fluid leak.

A tank with an angled indicator assembly is disclosed. A flexible membrane may be connected to an inner wall of a shell of the tank and separates a tank cavity into a first chamber sealed to contain a pressurized gas and a second chamber sealed to contain a pressurized fluid. The tank may include an indicator assembly that includes a coupling connected to an exterior of the shell. A sight cap with a transparent viewing window can operably connect to coupling. The coupling and the sight cap define an internal viewing pocket in fluid communication with the first chamber of the tank cavity. The coupling may connect to the shell at an angle defined by the angle of a longitudinal axis of the coupling relative to a longitudinal axis of the tank.

The present disclosure provides systems and methods for refilling fluid containers. A fluid container may include a bottle and a valve assembly. The valve assembly may include two valves and be configured to engage with the bottle and a filling head or dispensing head. A system is configured to provide pressurized fluid to the refillable container, monitor filling, determine when to stop filling, and determine how much fluid was provided. The valve assembly may include a float mechanism coupled to one of the valves of the valve assembly to ensure fluid flow is stopped when the fluid container is full. The fluid, which can include carbon dioxide, is stored in a storage tank. A flow system provides the fluid to a filling head, which engages with the fluid container. The flow system includes a transfer pump, valves, and sensors configured to provide the fluid to the filling head.

An exemplary portable pressure vessel apparatus includes a cylinder body, an undercarriage subassembly, and a collar subassembly. The undercarriage subassembly includes a foot portion, one or more wheel mount brackets, two wheels, and a forward tilt stabilizer. The collar subassembly is attached to the top dome of the cylinder body, and includes a collar, one or more rear support feet, and one or more collar brackets. The wheels are removably mountable to respective wheel mount brackets. The forward tilt stabilizer is removably securable to the foot portion. The wheels and the forward tilt stabilizer are configured to stably support the cylinder body on a local horizontal surface in a vertical position when the wheels are mounted and the forward tilt stabilizer is secured. The foot portion is configured to stably support the cylinder body in a vertical position when the forward tilt stabilizer and the wheels are removed.