Abstract: A combustible gas burner includes gas flow conduit or a housing having an outlet and a pressure relief valve. The pressure relief valve includes a valve seat at the outlet, a valve body and a valve body rotator. The valve body is configured to engage the valve seat and move along an axis relative to the valve seat in response to a pressure at the outlet. The valve body rotator is configured to rotate the valve body about the axis in response to movement of the valve body along the axis relative to the valve seat.

Abstract: A combustible gas burner includes gas flow conduit or a housing having an outlet and a pressure relief valve. The pressure relief valve includes a valve seat at the outlet, a valve body and a valve body rotator. The valve body is configured to engage the valve seat and move along an axis relative to the valve seat in response to a pressure at the outlet to regulate the flow of combustible gas through the outlet. The valve body rotator is configured to rotate the valve body about the axis in response to movement of the valve body along the axis relative to the valve seat.

Abstract: A pressure relief valve includes a valve seat at the outlet, a valve body, and an air dashpot damper. In some embodiments, the valve body is configured to engage the valve seat and move along a central axis relative to the valve seat in response to a pressure at the outlet to regulate a flow of combustible gas through the outlet. In some embodiments, the air dashpot damper includes a tubular member having a closed distal end and an open proximal end, and a piston member received within the tubular member. In some embodiments, the tubular member or the piston member is attached to the valve body, and the piston moves relative to the tubular member along an axis of the tubular member in response to movement of the valve body relative to the valve seat. In some embodiments, the pressure relief valve includes a plurality of the air dashpot dampers.

Abstract: A pressure relief valve includes a valve seat at the outlet, a valve body, and an air dashpot damper. In some embodiments, the valve body is configured to engage the valve seat and move along a central axis relative to the valve seat in response to a pressure at the outlet to regulate a flow of combustible gas through the outlet. In some embodiments, the air dashpot damper includes a tubular member having a closed distal end and an open proximal end, and a piston member received within the tubular member. In some embodiments, the tubular member or the piston member is attached to the valve body, and the piston moves relative to the tubular member along an axis of the tubular member in response to movement of the valve body relative to the valve seat. In some embodiments, the pressure relief valve includes a plurality of the air dashpot dampers.

Abstract: An air-assist flare includes a flare body, a gas feed pipe, and a pilot burner. The flare body includes a tubular body having a longitudinal axis and a fan adjacent to a proximal end of the tubular body. The fan is configured to drive a flow of air through the tubular body along the longitudinal axis. The gas feed pipe includes an output port within the tubular body. The pilot burner is configured to ignite a mixture of flammable gas discharged through the output port and the flow of air. The gas feed pipe supports at least a portion of the weight of the flare body.

Abstract: A combustible gas burner includes gas flow conduit or a housing having an outlet and a pressure relief valve. The pressure relief valve includes a valve seat at the outlet, a valve body and a valve body rotator. The valve body is configured to engage the valve seat and move along an axis relative to the valve seat in response to a pressure at the outlet. The valve body rotator is configured to rotate the valve body about the axis in response to movement of the valve body along the axis relative to the valve seat.

Abstract: A combustible gas burner includes gas flow conduit or a housing having an outlet and a pressure relief valve. The pressure relief valve includes a valve seat at the outlet, a valve body and a valve body rotator. The valve body is configured to engage the valve seat and move along an axis relative to the valve seat in response to a pressure at the outlet to regulate the flow of combustible gas through the outlet. The valve body rotator is configured to rotate the valve body about the axis in response to movement of the valve body along the axis relative to the valve seat.

Abstract: Apparatus and methods for hitching and unhitching of trailers or other towed devices are disclosed. The hitch assemblies may include alignment features to correct for errors in alignment of the hitch and trailer tongue during the hitching process. The hitch assemblies may compensate for vertical as well as horizontal misalignment. In addition, the hitch assemblies may include automated capture and release of the tongue on the hitch. The hitch assemblies may also disengage integral braking systems that are present on the trailer during the hitching process and re-engage the brakes after unhitching. All of these operations may be accomplished without requiring the driver of the towing vehicle to leave the driving position.

Abstract: Apparatus and methods for hitching and unhitching of trailers or other towed devices are disclosed. The hitch assemblies may include alignment features to correct for errors in alignment of the hitch and trailer tongue during the hitching process. The hitch assemblies may compensate for vertical as well as horizontal misalignment. In addition, the hitch assemblies may include automated capture and release of the tongue on the hitch. The hitch assemblies may also disengage integral braking systems that are present on the trailer during the hitching process and re-engage the brakes after unhitching. All of these operations may be accomplished without requiring the driver of the towing vehicle to leave the driving position.

Abstract: A container assembly for transporting bulk materials that includes a molded, one-piece completely integral non-metallic container insert and a frame supporting the container insert. The container insert can be molded of polyolefin. It can include walls having varying thicknesses, a bottom wall having a thickness greater than the side walls, and/or reinforcing structures molded within the walls. The container assembly can be constructed to provide a fixed truck box or dump truck box.

Abstract: A container assembly for transporting bulk materials that includes a molded, one-piece completely integral non-metallic container insert and a frame supporting the container insert. The container insert can be molded of polyolefin. It can include walls having varying thicknesses, a bottom wall having a thickness greater than the side walls, and/or reinforcing structures molded within the walls. The container assembly can be constructed to provide a fixed truck box or dump truck box.

Abstract: A container assembly for transporting bulk materials that includes a molded, one-piece completely integral non-metallic container insert and a frame supporting the container insert. The container insert can be molded of polyolefin. It can include walls having varying thicknesses, a bottom wall having a thickness greater than the side walls, and/or reinforcing structures molded within the walls. The container assembly can be constructed to provide a substantially enclosed tank, a roll-off container, intermodal container, fixed truck box, or dump truck box.

Abstract: An intermodal container having a non-metallic tuner receptacle in an external frame, where the inner receptacle has a bottom wall and side walls formed of a one-piece, completely integral sheet.