Embodiments of the invention are directed toward a novel pressurized vapor cycle for distilling liquids. In some embodiments of the invention, a liquid purification system is revealed, including the elements of an input for receiving untreated liquid, an evaporator condenser (600) coupled to the input for transforming the liquid to vapor and for transforming compressed vapor into a distilled liquid produce, a head chamber (300) for collecting the vapor from the evaporator condenser (600), a regenerative blower in communication with the head chamber for compressing the vapor, wherein the evaporator condenser (600) comprising a plurality of parallel core evaporator tubes, each tube having a first open end in communication with the input and a second open end in communication with the head chamber (300). Other embodiments of the invention are directed toward heat management, and other process enhancements for making the system especially efficient.

A liquid ring compressor (10), wherein the gas distribution is obtained by means of a central stator (11), which has a frusto conical shape, comprising at least a rotor (12A, 12B), provided with a plurality of radial blades (14) mounted on a shaft (13), which is concentric with the longitudinal axis (25) of the compressor (10); the configuration of the blade (14) is such that performances, substantially higher than the performances of the traditional compressors, can be obtained at relatively high working pressures; finally, in order to obtain higher working pressures, two rotors (12A, 12B) of the above described type are positioned one after the other and a hydraulic barrage is created between first and second stage, in order to oppose the natural gas flow from the second stage rotor (12B), at high pressure, to the first stage rotor (12A), at a lower pressure.

In a liquid ring pump having a port member (50) with at least one auxiliary gas discharge port (58a) in addition to the main gas discharge port, an auxiliary gas discharge conduit (68) is provided to extend the auxiliary gas discharge port so that a relatively large check valve (78) can be more easily provided for the auxiliary port. The auxiliary discharge conduit (68) is preferably provided in the head member of the pump, and it preferably extends away from the auxiliary port in a generally radial direction. This allows the check valve to be placed at a less congested location in the pump, which facilitates provision of a larger check valve and also access to the check valve for such purposes as maintenance of the check valve.

A double-lobe liquid ring gas compressor includes a port member having two circumferentially spaced intake ports and two circumferentially spaced discharge ports. The intake ports are axially offset from the discharge ports. The intake ports are connected to a common intake passage in the port member, and the discharge ports are similarly connected to a common discharge passage in the port member. These passages respectively communicate with intake and discharge manifolds in a head member which can be identical to the head member of a single-lobe liquid ring vacuum pump.