A filter for liquids with a filter head provided with inlet and outlet channels and with a filter body arranged therebelow which is retained at the filter head by a central threaded connection, and in which the discharge of the liquid takes place centrally; a bolt engaging by means of a thread in the filter body is thereby provided to establish the threaded connection which is in communication by way of a coaxial dead-end bore and a cross bore, on the one hand, with the interior of the filter bo...

A filter for liquids and particularly coffee comprises a container having a planar horizontal base formed with at least one filtrate drainage opening, and on its inner face formed with a plurality of radial ribs and a central support member which together support a generally planar filter element of thin sheet material in spaced parallel relationship to the base. In use the arrangement produces a toroidal circulation of liquid which prevents compaction of the filter cake and reduces clogging of ...

There is disclosed a liquids container provided with duct means for conducting fluids into and out of the container, the container comprising head and base portions and side walls connecting the head and base portions, and the duct means being secured to and extending into the container from the head portion. The duct means comprises three concentric pipes, the outermost one of which opens into the container near its head portion and the other two of which open into the container near its base p...

In fractionating tower apparatus including a plurality of modules including multi-stage segments, the improvement comprising the combination of a plurality of vaporizers for heating feed liquid to different temperatures to vaporize fractions of correspondingly different volatilities, means for feeding the vaporized fractions to different multi-stage segments of the tower, means for withdrawing liquid sidestreams from a plurality of the segments, temperature control means for limiting the level o...

Electrostatic spraying of liquid compositions is carried out by supplying the liquid to a spray orifice, preferably of capillary dimensions, having a charged surface which is electrically conducting or semi-conducting and which is adjacent a field intensifying electrode, the arrangement being such that the liquid is drawn out primarily by electrostatic forces, atomized into electrically charged particles without substantial corona discharge and projected past the field intensifying electrode. Th...

Spraying apparatus for spraying liquid pesticides on to crops growing in the ground includes a plurality of electrostatic spraying devices mounted on a boom which can be mounted on a powered vehicle such as a tractor or an aircraft. Each spraying device includes a spray-head having an at least electrically semi-conducting surface charged to a potential of the order of 1-20 kilovolts, a field intensifying electrode mounted adjacent the spray-head surface and being so sited relative to the spray-h...

A continuous liquid/liquid or liquid/solids contactor consists of a rotary contactor having a near horizontal axis. The interior of the drum is divided axially into a number of compartments by spaced discs secured to the drum wall and having openings through which the materials to be contacted can pass from one end to the other of the drum. In each compartment, there are a number of buckets which are carried by the discs and which in operation serve to cause intermingling of the materials to be ...

A method for treating a body of liquid with a gas, which method comprises passing a stream of the liquid through a conduit, injecting gas intermittently into the stream at high pressure so as to dissolve at least some of the gas in the liquid stream, and introducing the stream containing dissolved gas and undissolved bubbles of gas into the main body of liquid under turbulent conditions such that the undissolved bubbles are shattered into even finer bubbles which dissolve in, or are consumed wit...

An improved flowmeter for liquids is provided of the type which includes a housing, a cylindrical chamber formed in the housing, a shaft rotatably mounted in the housing and extending coaxially through the chamber, an impeller mounted on the shaft and an inlet and outlet channel provided in the housing and communicating with the chamber. The impeller is provided with a coaxially disposed circular disc having a plurality of radiation-permeable passageways formed therethrough spaced about the peri...

Mixing of liquids by passing through space delineated by body of revolution and surrounding co-operating casing in relative rotation, the co-operating surface of rotating part having plurality of grooves at angle less than 80.degree. to its axis and one liquid being fed to grooved surface at point distance by less than distance between body and casing, and the liquids being immediately thereafter fed through zone providing high grade dispersive mixing.