Colloidal mixing of cementitious material into a liquid such as water to form a grout slurry for pumping to a location for use includes a mixing tank and a colloidal mixing mill which grinds and pumps the mixed material with the material being repeatedly circulated between the mill and the tank. The colloidal mixing mill includes a housing defining a generally cylindrical chamber containing a rotor shaped to define a clearance of the order of 3 mm between the front and rear wall of the housing and the rotor with holes from a dished front face of the rotor to the rear face to carry the mixed materials to the clearance where a shearing action takes place to shear the particles in the mixed materials prior to exit through the outlet.

A micronizing device including a positive displacement pump configured to rotate a vaned wheel from a side of a suction port of a case to a side of a delivery port of the case opposite to a partitioning wall, transport fluid to a rotation direction of the vaned wheel, pressure the fluid in a pump chamber which converges from the side of the suction port of the case to the side of the delivery port, and deliver the fluid from the delivery port of the case, and a side end surface reaching a vane from a boss portion of the vaned wheel and a side end surface of the partitioning wall of the case include grinding surfaces, and the sample is micronized by way of grinding caused by rotation of the vaned wheel and by way of shearing caused by the vane of the vaned wheel on these grinding surfaces.

A system for mixing fracturing gel includes a dry gel mixing chamber having a bladed impeller carried to rotate in the mixing chamber. The mixing chamber has a dry gel inlet and hydrating fluid inlet. A valve is fluidically coupled to the hydrating fluid inlet to automatically maintain a specified flow condition of hydrating fluid into the mixing chamber over multiple different values of the flow condition to the hydrating fluid inlet.

A bathwater circulating system has a pump operable to draw fluid in at an intake port and expel it under pressure at an output port. Water- and air-supply conduits feed water and air to the intake port at a rate determined by a flow-restricting air-intake valve so that the pump mixes the water and the air, pressurizes the mixture and thereby dissolves the air in the water, and expels the air/water mixture at the output port. A pressure-reducing valve is connected by an output conduit that extends from the output port to the pressure relief valve and conducts the water/air-bubble mixture from the pump to the pressure-reducing valve without separation of the air from the water and such that the mixture is at least partially depressurized at the pressure-reducing valve such that the air forms microbubbles in the water.

A combination water and air pump and method of use, for simultaneously circulating and aerating water. The pump including a housing, a first chamber for circulating water, having an inlet for water to be drawn into the first chamber and an outlet for water to exit the first chamber, a second chamber for aerating water, having an inlet for water to be drawn into the second chamber, an apparatus to draw air into the second chamber, and an outlet for aerated water to exit the second chamber. A rotatable shaft connected to a first rotatable impeller in the first chamber and a second rotatable impeller in the second chamber. In use, rotation of the shaft simultaneously rotates the impellers to circulate water within said first and second chambers.

A vapor hood for a proppant blending system, with a proppant entrance port to receive proppant, the proppant entrance port having a one way valve to allow the flow of proppant but prevent the backflow of vapor when the proppant is not entering the vapor hood.

A system for mixing fracturing gel includes a dry gel mixing chamber having a bladed impeller carried to rotate in the mixing chamber. The mixing chamber has a dry gel inlet and hydrating fluid inlet. A valve is fluidically coupled to the hydrating fluid inlet to automatically maintain a specified flow condition of hydrating fluid into the mixing chamber over multiple different values of the flow condition to the hydrating fluid inlet.

A pump device (1) comprises a centrifugal pump (2) and a mixing unit (4) in which two fluids are mixed. The mixing unit (4) comprises a flapper valve (10) configured to move between a first and a second position in which it closes a first inlet (7) and a second inlet (8) of the mixing unit, respectively. At least one of the inlets houses a movable piston (13) which is biased towards being in contact with the flapper valve. The piston has at least one piston channel (15) or annular space (23) through which the fluid flows in to the mixing unit in a controlled manner.

A pump device (1) comprises a centrifugal pump (2) and a mixing unit (4) in which two fluids are mixed. The mixing unit (4) comprises a flapper valve (10) configured to move between a first and a second position in which it closes a first inlet (7) and a second inlet (8) of the mixing unit, respectively. At least one of the inlets houses a movable piston (13) which is biased towards being in contact with the flapper valve. The piston has at least one piston channel (15) or annular space (23) through which the fluid flows in to the mixing unit in a controlled manner.

A mixing unit for mixing a flow of liquid product is provided. The mixing unit comprises a stator forming a hollow sleeve, and a rotor having a circular displacement plate with two opposite sides, wherein at least one side has at least two chambers formed by a plurality of vanes extending in a direction being parallel with a longitudinal axis of the stator, wherein the rotor is arranged within the stator for rotating liquid product arranged in said chambers relative the stator. The displacement plate is tilted relative a longitudinal axis of the stator such that said at least two chambers have different volumes, and a side wall of the stator has at least one exit area comprising at least one through hole for allowing liquid product to exit the stator.