Abstract: A twist locking connector for a steam humidifier. The steam humidifier includes a tank for heating water to generate steam and a steam tube receiver structure in fluid communication with the tank. The steam tube receiver structure has an opening configured to receive a steam tube, where the opening has a plurality of ramp structures about the opening on a side facing the tank. The steam humidifier also includes a steam tube for transmitting steam from the tank to a duct, the steam tube having a plurality of locking tabs adjacent to an end and a flange adjacent to, but separated by a distance from, the locking tabs. The steam tube is assembled to the steam tube receiver by inserting the steam tube through the opening in the steam tube receiver structure and rotating the steam tube to cause the locking tabs to engage with the ramp structures.

Abstract: A steam humidifier having a water tank with a quick assembly feature. The steam humidifier includes a removable tank, where the removable tank is configured to contain water to be heated to generate steam and a handle that is configured to selectively secure the removable tank to the humidifier. The handle defines at least a first rotational position in which a tank support feature on the tank is engaged with a handle support feature on the handle such that the tank is attached to the humidifier. The handle further defines at least a second rotational position in which the tank support feature is disengaged from the handle support feature such that the tank is unattached from the humidifier. Additional embodiments are disclosed.

Abstract: A twist locking connector for a steam humidifier. The steam humidifier includes a tank for heating water to generate steam and a steam tube receiver structure in fluid communication with the tank. The steam tube receiver structure has an opening configured to receive a steam tube, where the opening has a plurality of ramp structures about the opening on a side facing the tank. The steam humidifier also includes a steam tube for transmitting steam from the tank to a duct, the steam tube having a plurality of locking tabs adjacent to an end and a flange adjacent to, but separated by a distance from, the locking tabs. The steam tube is assembled to the steam tube receiver by inserting the steam tube through the opening in the steam tube receiver structure and rotating the steam tube to cause the locking tabs to engage with the ramp structures.

Abstract: A twist locking connector for a steam humidifier. The steam humidifier includes a tank for heating water to generate steam and a steam tube receiver structure in fluid communication with the tank. The steam tube receiver structure has an opening configured to receive a steam tube, where the opening has a plurality of ramp structures about the opening on a side facing the tank. The steam humidifier also includes a steam tube for transmitting steam from the tank to a duct, the steam tube having a plurality of locking tabs adjacent to an end and a flange adjacent to, but separated by a distance from, the locking tabs. The steam tube is assembled to the steam tube receiver by inserting the steam tube through the opening in the steam tube receiver structure and rotating the steam tube to cause the locking tabs to engage with the ramp structures.

Abstract: A humidifier for direct low pressure injection of steam into a duct. A source of steam is provided, and a steam tube is in fluid communication with the source of steam. A distal end segment of the steam tube is inclined with respect to the horizontal when the system is mounted to a duct to cause condensation within the steam tube to drain back to the source of steam under the force of gravity. The distal end of the steam tube includes an opening having a lip on an inside surface of the opening, where the lip directs condensation formed at the opening to flow back into the steam tube and back to the source of steam.

Abstract: In one aspect, a steam humidifier is disclosed. The steam humidifier includes a tank for containing water to be heated to generate steam and a water connection manifold that has a manifold chamber in fluid communication with a water supply passage and a water drain passage. The steam humidifier further includes a rotary valve that is configured to control a fluid passage between the tank and the manifold chamber and that is further configured to control the position of one or more locking features. The rotary valve is rotatable between a first locked position and a second unlocked position. In the first locked position, the fluid passage between the tank and the manifold chamber is open and the one or more locking features are engaged with a structure of the steam humidifier. In the second unlocked position, the fluid passage between the tank and the manifold chamber is closed and the one or more locking features are disengaged from the structure of the steam humidifier. Other aspects are disclosed.

Abstract: A steam humidifier having a water tank with a quick assembly feature. The steam humidifier includes a removable tank, where the removable tank is configured to contain water to be heated to generate steam and a handle that is configured to selectively secure the removable tank to the humidifier. The handle defines at least a first rotational position in which a tank support feature on the tank is engaged with a handle support feature on the handle such that the tank is attached to the humidifier. The handle further defines at least a second rotational position in which the tank support feature is disengaged from the handle support feature such that the tank is unattached from the humidifier. Additional embodiments are disclosed.

Abstract: In one aspect, a steam humidifier is disclosed. The steam humidifier includes a tank for containing water to be heated to generate steam and a water connection manifold that has a manifold chamber in fluid communication with a water supply passage and a water drain passage. The steam humidifier further includes a rotary valve that is configured to control a fluid passage between the tank and the manifold chamber and that is further configured to control the position of one or more locking features. The rotary valve is rotatable between a first locked position and a second unlocked position. In the first locked position, the fluid passage between the tank and the manifold chamber is open and the one or more locking features are engaged with a structure of the steam humidifier. In the second unlocked position, the fluid passage between the tank and the manifold chamber is closed and the one or more locking features are disengaged from the structure of the steam humidifier. Other aspects are disclosed.

Abstract: A twist locking connector for a steam humidifier. The steam humidifier includes a tank for heating water to generate steam and a steam tube receiver structure in fluid communication with the tank. The steam tube receiver structure has an opening configured to receive a steam tube, where the opening has a plurality of ramp structures about the opening on a side facing the tank. The steam humidifier also includes a steam tube for transmitting steam from the tank to a duct, the steam tube having a plurality of locking tabs adjacent to an end and a flange adjacent to, but separated by a distance from, the locking tabs. The steam tube is assembled to the steam tube receiver by inserting the steam tube through the opening in the steam tube receiver structure and rotating the steam tube to cause the locking tabs to engage with the ramp structures.

Abstract: A humidifier for direct low pressure injection of steam into a duct. A source of steam is provided, and a steam tube is in fluid communication with the source of steam. A distal end segment of the steam tube is inclined with respect to the horizontal when the system is mounted to a duct to cause condensation within the steam tube to drain back to the source of steam under the force of gravity. The distal end of the steam tube includes an opening having a lip on an inside surface of the opening, where the lip directs condensation formed at the opening to flow back into the steam tube and back to the source of steam.

Abstract: An electrohydraulic valve pilot stage for controlling differential pressure is disclosed. The electrohydraulic valve pilot stage has a housing for protecting the valve; a first and second inlet capable of connection to fluid supplies; a first nozzle and a second nozzle fluidly connected to the inlets; a baseplate attached to the housing and the nozzles; a restraining member attached to the baseplate at a position between the first nozzle and the second nozzle; a pivot pin; a flapper restrained by the restraining member and having a first end and a second end, the flapper pivotably mounted on the pivot pin; and a null adjust pin mounted in a pivot pin contact capable position for adjusting the position of the ends of the flapper relative to the nozzles.

Abstract: An improved pilot stage includes a flapper having first and second ends, first and second nozzles in fluid communication with the first and second ends, and a magnetic torque motor having a first coil which is magnetically coupled to the first end of the flapper. An input current to the first coil creates a magnetic torque on the flapper, causing the flapper to pivot. The torque input from the magnetic circuit is reflected through the pivot to create a balancing differential pressure output at the nozzles proportional to the input electrical signal. The flapper does not require a torsion bar (or tube) pivot or a separate armature, as required by functionally similar pilot stages.

Abstract: An improved pilot stage includes a flapper having first and second ends, first and second nozzles in fluid communication with the first and second ends, and a magnetic torque motor having a first coil which is magnetically coupled to the first end of the flapper. An input current to the first coil creates a magnetic torque on the flapper, causing the flapper to pivot. The torque input from the magnetic circuit is reflected through the pivot to create a balancing differential pressure output at the nozzles proportional to the input electrical signal. The flapper does not require a torsion bar (or tube) pivot or a separate armature, as required by functionally similar pilot stages.

Abstract: An electrohydraulic valve pilot stage for controlling differential pressure is disclosed. The electrohydraulic valve pilot stage has a housing for protecting the valve; a first and second inlet capable of connection to fluid supplies; a first nozzle and a second nozzle fluidly connected to the inlets; a baseplate attached to the housing and the nozzles; a restraining member attached to the baseplate at a position between the first nozzle and the second nozzle; a pivot pin; a flapper restrained by the restraining member and having a first end and a second end, the flapper pivotably mounted on the pivot pin; and a null adjust pin mounted in a pivot pin contact capable position for adjusting the position of the ends of the flapper relative to the nozzles.

Abstract: A bio regeneration air filter having a pot for holding a filtering media and plant. The filtering media traps contaminates from air circulated therethrough and microorganisms associated with the root system break down the contaminates to convert them to plant food whereby the filtering media regenerates and need not be replaced. Air intake tubes draw air to or force air through the filtering media and communicate with a motor driven fan located in a base assembly which is removable from the pot. The fan can push air upwardly through air intake tubes, or reversely, draw air downwardly through the air intake tubes, whereby in either direction to bring ambient indoor air through the filtering media for bio regeneration filtering to occur. The pot may have an integrally formed air chamber for the air intake tubes or the system may include a separate air pan assembly forming a chamber below the pot and between the pot and the fan in the base.

Abstract: A septic tank is formed from a plurality of tank modules each of which comprises a substantially closed container. Each tank module is bolted to a next adjacent tank module at a flat end wall thereof with the bolts being of large diameter and in some cases including a central longitudinally extending opening so that the bolts act to communicate fluid from one tank module to the next adjacent tank module. Each tank module is shaped with an upper wall part which is of parabolic arch shape and a base wall which is substantially flat. This defines the optimum shape for strength to accommodate the forces when the tank is buried. Tanks can thus be formed in modular parts so that various different size modules can be connected together by the above coupling technique to form a multitude of different sizes of tank.

Abstract: A turbo fan vent for use on the roof of a building and having a close-louvered low profile turbine affixed to a rotary shaft which is rotationally supported by bracing and bearing means associated with a lower concentric collar. The collar is spaced inwardly of said turbine and is vertically overlapped by the turbine. The rotary shaft carries a large fan blade assembly arranged within said collar. The collar has a diameter substantially less than the side wall of the turbine whereby to create a large passageway for effective air ventilation. The turbine is freely rotatable by wind currents to rotate the exhaust fan assembly to draw air upwardly through said collar and outwardly through the passageway. The collar is adapted to be mounted onto a complementarily shaped stack adaptor affixed to the roof of a structure and communicative interiorly thereof.

Abstract: The present invention is directed to a two stage hydraulic servo amplifier wherein the boost stage valve comprises two separate valve members, each individually controlling one of a pair of controlled outputs and wherein the position of each valve member is modulated by inputs from a pilot stage acting against separate biasing forces for each valve member.