A height adjustable hitch receiver is disclosed and described.

A height adjustable hitch receiver is disclosed and described.

A pressure indicator, including: a check valve; an upper cover; an intermediate member; an elastic pressure-sensing diaphragm; a transmission indication rod; and a lower cover. The check valve is disposed in the upper cover, and the inner wall of the upper cover and the check valve are assembled to form an upper opening. The opening of an air channel which communicates with the air is disposed inside the circular groove. The positioning bulge of the upper cover is connected to the positioning groove of the intermediate member. The lower port of the intermediate member is bonded with the circumferential flange of the elastic pressure-sensing diaphragm. The lower surface of the elastic pressure-sensing diaphragm is provided with a groove configured to coordinate with the support end of the transmission indication rod. The connection rod is connected to the top and bottom of the support end.

A pressure indicator, including: a check valve; an upper cover; an intermediate member; an elastic pressure-sensing diaphragm; a transmission indication rod; and a lower cover. The check valve is disposed in the upper cover, and the inner wall of the upper cover and the check valve are assembled to form an upper opening. The opening of an air channel which communicates with the air is disposed inside the circular groove. The positioning bulge of the upper cover is connected to the positioning groove of the intermediate member. The lower port of the intermediate member is bonded with the circumferential flange of the elastic pressure-sensing diaphragm. The lower surface of the elastic pressure-sensing diaphragm is provided with a groove configured to coordinate with the support end of the transmission indication rod. The connection rod is connected to the top and bottom of the support end.

An air data probe includes a probe head and an air data sensing port. The probe head defines a longitudinal axis extending from a forward tip of the probe head to an aft end of the probe head. The probe head has an elliptical cross section orthogonal to the longitudinal axis. The air data sensing port is disposed in the probe head aft of the forward tip. A length of a major axis of the elliptical cross section and a length of a minor axis of the elliptical cross section can be configured to cause boundary layer separation of airflow across the probe head at a flow separation region that is aft of the air data sensing port.

An air data probe includes a probe head and an air data sensing port. The probe head defines a longitudinal axis extending from a forward tip of the probe head to an aft end of the probe head. The probe head has an elliptical cross section orthogonal to the longitudinal axis. The air data sensing port is disposed in the probe head aft of the forward tip. A length of a major axis of the elliptical cross section and a length of a minor axis of the elliptical cross section can be configured to cause boundary layer separation of airflow across the probe head at a flow separation region that is aft of the air data sensing port.

A pressure indicator includes a body, a piston, first and second biasing elements, and a rotatable disc. The piston is disposed at least partially in a bore of the body at a first longitudinal axial position relative to the body when pressure of fluid acting on the base is below a threshold pressure. The first biasing element is disposed between a base of the piston and a shoulder of the body, wherein a force of the first biasing element is overcome by pressure of fluid acting on the base at or above the threshold pressure, thereby allowing the piston to move to a second longitudinal axial position. The rotatable disc has a first rotational position when the piston is in the first axial position. The second biasing element is configured to urge the disc to a second rotational position when the piston is in the second axial position.

An air operated diaphragm pump is provided a housing having an orifice formed therein; a gas passageway configured to provide gas through the air operated diaphragm pump in order to pump syrup through the air operated diaphragm pump; a syrup passageway configured to provide the syrup through the air operated diaphragm pump when the gas is passed though the gas passageway, part of the syrup passageway configured in fluidic communication with the orifice of the housing with an inside pressure greater than an external pressure of the outside atmosphere when the syrup is provided through the air operate diaphragm pump; and an indicator arrangement configured or arranged in the orifice of the housing to communicate with the syrup passageway, and to respond or activate when a vacuum force exceeds a predetermined level and provide a visual indication when the syrup is no longer provided through the air operated diaphragm pump.

An air operated diaphragm pump is provided a housing having an orifice formed therein; a gas passageway configured to provide gas through the air operated diaphragm pump in order to pump syrup through the air operated diaphragm pump; a syrup passageway configured to provide the syrup through the air operated diaphragm pump when the gas is passed though the gas passageway, part of the syrup passageway configured in fluidic communication with the orifice of the housing with an inside pressure greater than an external pressure of the outside atmosphere when the syrup is provided through the air operate diaphragm pump; and an indicator arrangement configured or arranged in the orifice of the housing to communicate with the syrup passageway, and to respond or activate when a vacuum force exceeds a predetermined level and provide a visual indication when the syrup is no longer provided through the air operated diaphragm pump.

To improve connectivity with tubes to be connected to an inlet and an outlet of a flow passage, while increasing the rapidity of an operation of changing a fluid to be passed through the flow passage and also increasing the safety. Provided is a pressure detecting device including a pressure detecting unit detecting a pressure transmitted to a diaphragm, a flow passage unit having a diaphragm for transmitting a pressure of a fluid flowing through the flow passage to the diaphragm, and a nut for removably mounting the flow passage unit onto the pressure detecting unit. The nut mounts the flow passage unit onto the pressure detecting unit when a position of a positioning groove of the pressure detecting unit about an axis coincides with a position of a positioning projection of the flow passage unit about an axis.