Abstract: A sequencing valve and associated hydronic system are provided. The valve has first and second ports, which can be connected to a heat exchange device, and the valve is configured to selectively provide multiple fluids to the heat exchange device. For example, the valve can selectively connect hot and cold water supplies to the heat exchanger so that the heat exchanger can be used alternately to heat and cool air for a refrigeration system. The valve can include check valves that are adjusted by rotatable cams for controlling the flow of fluids into and out of the ports. Each cam can be mounted on a rotatable shaft so that the cams rotate to adjust the check valves between open and closed positions.

Abstract: A sequencing valve and associated hydronic system are provided. The valve has first and second ports, which can be connected to a heat exchange device, and the valve is configured to selectively provide multiple fluids to the heat exchange device. For example, the valve can selectively connect hot and cold water supplies to the heat exchanger so that the heat exchanger can be used alternately to heat and cool air for a refrigeration system. The valve can include check valves that are adjusted by rotatable cams for controlling the flow of fluids into and out of the ports. Each cam can be mounted on a rotatable shaft so that the cams rotate to adjust the check valves between open and closed positions.

Abstract: A bi-directional flow-control device includes a housing defining a flow passage and first and second orifices installed in the passage, each orifice being tubular and having a seat, each seat having a plurality of circumferentially spaced flow-control channels, the seat of the second orifice being axially spaced from and facing the seat of the first orifice. A resiliently deformable diaphragm is disposed between the seats, whereby flow through the passage in a first direction urges the diaphragm against the seat of the first orifice and flow through the passage in an opposite second direction urges the diaphragm against the seat of the second orifice. The diaphragm in each case deforms into the channels in the seat to varying degrees as a function of pressure differential such that in either flow direction the flow is regulated to a substantially constant volumetric flow rate over a range of pressure differentials.

Abstract: A fluid flow control valve comprises a housing defining a fluid flow passage extending longitudinally therethrough, the housing having opposite ends each defining an opening for flow into and out of the fluid flow passage, and an orifice and diaphragm disposed in the housing. The orifice has a seat at one end thereof facing the diaphragm. The diaphragm has one end face that opposes the seat of the orifice, the seat being configured such that one or more flow control passages are defined between the seat and the one end face of the diaphragm through which the fluid flows. The seat is contoured to include at least two different shapes of channels each promoting localized bending of the diaphragm at a different pressure differential, thereby permitting an expansion of the working pressure range to very low pressure differentials.