A fluidics module rotatable about a rotational center includes first and second chambers and a compression chamber. First and second fluid channels are provided between the first and second chambers and the compression chamber, respectively. The flow resistance of the second fluid channel is smaller, for a flow of liquid from the compression chamber to the second chamber, than a flow resistance of the first fluid channel for a flow of liquid from the compression chamber to the first chamber. Upon rotation at a high rotational frequency, liquid is initially introduced from the first chamber into the compression chamber via the first fluid channel, so that a compressible medium is compressed within the compression chamber. Subsequently, the rotational frequency is reduced, so that the compressible medium within the compression chamber will expand and so that, thereby, liquid is driven into the second chamber via the second fluid channel.

An inflating device includes a bottle for containing a pressurized air, a housing is secured to the bottle and includes an orifice communicating with an inner chamber of the bottle, a valve piece is engaged in the housing and includes a shank engaged in the orifice of the housing, and a spring biasing member is engaged with the valve piece for biasing the valve piece to engage with the housing and to make an air tight seal between the housing and the valve piece. The pressurized air and a fluid contained in the bottle are allowed to flow out through the orifice of the housing when the pressurized air includes a pressure greater than a spring biasing force of the spring biasing member.

A unique piping arrangement of a water pump system is designed to prevent backflow of non-potable liquid into a potable water source thereby complying with plumbing codes to provide a safe cross connection. These codes are required when a water ejector uses pressurized potable water as an energy source. When the water ejector valve is open due to a high sump level and when the potable water pressure drops below atmospheric, the non-potable liquid can be siphoned into the potable water source thereby causing contamination, a significant unsafe health hazard to consumers. The present invention complies with plumbing codes by creating the required vertical air gap from the potable water source down to the non-potable liquid in the discharge piping as well as the inlet piping, the sources of contamination. In the piping arrangement are vents and drains to create the required air gap and transparent piping to provide required inspection and verification of proper operation. The water ejector is commonly used as a back-up to a traditional electric sump pump. The invention provides simplicity to maximize system reliability. Two kits of commonly used applications, a residential full basement back-up water ejector sump pump and a residential crawlspace back-up water ejector sump pump, are described.

This invention provides pneumatic pump cycle counters, methods for assembling pneumatic pump cycle counters, and methods for obtaining pump counts with the pneumatic pump cycle counters for wells and other systems that are equipped with pneumatic pumps.