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A mixing apparatus includes a mixing tube, a liquid inlet, a dry substance inlet and a recirculation mixture inlet. The mixing apparatus is utilized with a tub. A liquid and a dry substance may be mixed in the mixing tube and the mixture may be recirculated so that a liquid, a dry substance and a re

A mixing apparatus includes a mixing tube, a liquid inlet, a dry substance inlet and a recirculation mixture inlet. The mixing apparatus is utilized with a tub. A liquid and a dry substance may be mixed in the mixing tube and the mixture may be recirculated so that a liquid, a dry substance and a recirculated mixture may all be mixed in a mixing tube and subsequently utilized in a wellbore. The mixing apparatus includes a valve connected to the liquid inlet. The valve comprises a cylindrical outer housing, a jetting sleeve and a rotatable plug therein. The jetting sleeve is disposed in the outer housing and has a plurality of ports which will direct liquid downwardly and inwardly so that it mixes with the dry substance as the dry substance passes downwardly in the mixing tube. The plug may be rotated in the jetting sleeve to completely cover all the jetting ports to prevent flow into the mixing tube and is rotatable to an open position in which liquid may be allowed to flow through the jetting ports. The valve is positioned at the exit of the liquid inlet.

대표청구항 ▼

1. A mixing apparatus for forming a mixture of a liquid and a dry substance, the mixing apparatus comprising:a mixing tube; a liquid inlet member for conveying the liquid into the mixing tube; a bulk inlet member for conveying the dry substance into the mixing tube; and a jetting valve disposed betw

1. A mixing apparatus for forming a mixture of a liquid and a dry substance, the mixing apparatus comprising:a mixing tube; a liquid inlet member for conveying the liquid into the mixing tube; a bulk inlet member for conveying the dry substance into the mixing tube; and a jetting valve disposed between the liquid inlet member and the mixing tube for regulating the flow rate of the liquid into the mixing tube, the jetting valve comprising: an outer sleeve fixedly attached to the mixing tube, the outer sleeve having a first opening in communication with the liquid inlet member and a second opening in communication with the mixing tube; and a jetting sleeve disposed in the outer sleeve, the jetting sleeve having a entrance opening in communication with the first opening in the outer sleeve and a plurality of jetting ports defined therethrough in communication with the second opening in the outer sleeve; wherein in an open position of the jetting valve the liquid is permitted to flow from the liquid inlet member through the first opening in the outer sleeve and the entrance opening in the jetting sleeve and out through the jetting ports and the second opening in the outer sleeve into the mixing tube, and wherein in a closed position of the jetting valve no flow of the liquid is permitted through the jetting ports.