Differential pressure fitting

Abstract

A pipe connection fitting having at one end a tapered edge ( 1 ) which communicates at its base with tightening nut ( 2 ) which communicates with male pipe threads ( 3 ) which communicates with extension member ( 4 ) having an angle cut ( 6 ) with a flow port ( 5 ) through the center of the fitting. Positive differential pressure is created by installing a differential pressure fitting facing into the fluid stream of a flow line. Negative differential pressure is created by installing a differential pressure fitting facing away from the fluid stream of a flow line. Tubing connects the fittings to a pressure tank containing the fluid to be injected in the flow line. Fluid flow past the fittings in the flow line motivates flow from the flow line to the pressure tank and from the pressure tank back to the flow line. The fitting being made of rigid plastic or metal.

What is claimed is:  
     
         1 ) An injection system for use in connection with a flow line, comprising: 
 an injection tank;    a hose connection adapted to mate with the flow line having first and second, separate and identically constructed differential pressure fittings defining a flow passage intermediate a first opening and a second opening wherein the first opening is in fluid communication with the hose connection; and    first and second flexible tubes removeably matable with a respective one of the differential pressure fittings over the second opening to connect the injection tank between the first and second differential pressure fittings.    
     
     
         2 ) The system as recited in  claim 1 , further comprising a flow restrictor formed within the hose connection intermediate the first opening of the first differential pressure fitting and first opening of the second differential pressure fitting.  
     
     
         3 ) The system as recited in  claim 2 , wherein the first and second differential pressure fittings each include an extension portion, having the first opening, that extends into the hose connection and wherein the first opening of the extension portion of the first differential pressure fitting faces in a direction that is generally opposite from the direction in which the first opening of the extension portion of the second differential pressure faces.  
     
     
         4 ) The system as recited in  claim 3 , wherein an end of the extension portion of each of the first and second differential pressure fittings is provided with an angled cut to create the first opening.  
     
     
         5 ) The system as recited in  claim 4 , wherein each of the first and second differential pressure fittings comprises a barbed portion in which the second opening is formed.  
     
     
         6 ) The system as recited in  claim 5 , wherein the first and second differential pressure fittings are generally cylindrical in shape.  
     
     
         7 ) The system as recited in  claim 1 , wherein the first and second differential pressure fittings are in welded engagement with the hose connection.  
     
     
         8 ) The system as recited in  claim 1 , wherein the first and second differential pressure fittings are in threaded engagement with the hose connection.  
     
     
         9 ) The system as recited in  claim 1 , wherein the flow line includes a hose bib and the hose connector is adapted to mate with the hose bib.