Abstract:
A valved tap is disclosed comprising a tap body having a through bore from a threaded input end to an output end thereof. A globe valve is positioned in the valve body so as to interrupt the flow of fluid in the through bore. The output end of the tap body may comprise a flanged portion connectable to a manifold.

Description:
FIELD OF THE INVENTION 
       [0001]    The invention relates to taps for attaching to a pipeline containing a flowing fluid, such as oil or gas, as a means of connecting the pressure in the pipeline to a measuring instrument, such as a pressure transmitter. Recently, a new class of measuring instruments to measure a differential pressure, have been introduced to the market. These differential pressure transmitters record a high and a low pressure, taken by taps placed upstream and downstream of an orifice plate, placed in the flow in the pipeline. While it is possible to connect the differential pressure transmitters directly to the high and low pressure taps by means of piping and fittings, it has been found beneficial to interpose a manifold between the taps and the transmitter. The manifolds may be unvalved or valved to interrupt or control the flow to the transmitter. However, if maintenance, leaks or damage occurs to the manifold requiring it to be removed, repaired and/or replaced, it is difficult to exchange the manifold without shutting down the flow in the pipeline. This invention provides a valved tap to interrupt the flow through the tap in order to permit installation, removal, maintenance, replacement or repair of downstream equipment, such as piping, fittings, manifolds, transmitters and the like without the need to interrupt fluid flow in the pipeline. 
       BACKGROUND OF THE INVENTION 
       [0002]    Taps for connection to a pipeline are generally known. The taps usually comprise a tap body, one end of which terminates in an NPT thread, and the other end of which is designed to mate with a pressure measuring instrument, a manifold, or an adapter. Indeed, some of these taps were stabilized to transfer some of the stress on the NPT threads to the tap body. Several variations are described in U.S. Pat. Nos. 4,974,308; 6,871,881; 7,562,907, and U.S. D541,645, the disclosures of each of which are herein incorporated by reference. However, none of these taps provide a structure, or permit a method, of interrupting the flow through the tap. 
         [0003]    The valved tap of the invention may be used as a replacement for any tap, including the stabilized taps of the prior art noted above, in order to cause the interruption of flow through the tap and facilitate downstream installation, removal, maintenance, replacement or repair of downstream equipment, such as piping, fittings, manifolds, transmitters and the like without the need to interrupt fluid flow in the pipeline. 
       SUMMARY OF THE INVENTION 
       [0004]    The present invention provides a globe valve as an integral part of a tap, thereby providing both a method and apparatus for interrupting the flow through the tap to facilitate downstream installation, removal, maintenance, replacement or repair of downstream equipment, such as piping, fittings, manifolds, transmitters, and the like without the need to interrupt fluid flow in the pipeline. 
         [0005]    In the tap of the invention, the globe valve is preferable provided with opposing stems, connectable to handles to open, close, or control fluid flow through the valve. In practice, most installations will permit only the use of one handle due to the close proximity in which the high and low pressure taps are mounted not only in proximity to each other, but also to surrounding equipment, including supporting pipes, mounting brackets and related structure necessary to ultimately mount and secure the differential pressure transmitters. Thus, in actual use, only one of the opposing handles need be used in practice when the tap is installed for use in the field. However, the provision of two, opposing stems, provides the installer the option of connecting the handle at different positions, depending on the installed orientation of the tap to other taps or equipment. The tap of the invention may be provided with two installed handles at the factory, or each, or only one, handle may be provided in a kit with the tap of the invention, such that the positioning of the handle is left entirely to the installer in order to provide the option of positioning the handle on the tap after the tap in its actual operative position. Of course, the shape of the handle may be modified from that illustrated without departing from the spirit or scope of the invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]      FIG. 1  is a schematic, partially cross-sectional view illustrating the tap of the invention as provided with a globe valve having opposing stems, and at least one handle attached to the stem; 
           [0007]      FIG. 2  is a perspective view of the tap of  FIG. 1 ; 
           [0008]      FIG. 3  is an exploded view of the tap of  FIG. 2  according to the invention, in combination with one form of stabilizing element; 
           [0009]      FIG. 4  is a schematic representation of the tap of the invention, installed on a pipeline in a vertical orientation relative to the pipeline and connected to a manifold, and in proximity to a second tap according to the invention; 
           [0010]      FIG. 5  is a schematic view of the tap of the invention, installed on a flange of a pipeline, showing operation of the handle; 
           [0011]      FIG. 6  is a perspective view of  FIG. 4 ; 
           [0012]      FIG. 7  is a schematic representation of the taps of the invention, installed in a horizontal orientation to a pipeline; and, 
           [0013]      FIG. 8  is an exploded view of  FIG. 7  to further illustrate the details of the connection of the taps of the invention to a pipeline on the NPT end of the tap and to a manifold on a flanged end of the tap. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0014]    Throughout the specification and drawings, the same numeral will be used to denote the same element. Referring to  FIG. 8 , there are two taps  2 ,  3  required for each manifold  4  installation. The taps  2 ,  3  comprises a male NPT threaded end  1  and a flanged end  12 . The flanged end  12  is for attachment to a conventional valved manifold  4 . However, it also may be directly connected to an adapter or directly to a pressure measuring device. The male NPT threaded end  1  of taps  2 ,  3  can be directly threaded into the orifice fittings  5 ,  6 . The same tap  2 ,  3  can be used with shoes  7 ,  8  ( FIG. 8 ) in order to stabilize the taps on the curved surfaces  9 ,  10  of the pipe flange  11  containing the orifice taps  5 ,  6  shown in  FIG. 8 . 
         [0015]    Turning now to the inventive apparatus of  FIG. 1 , a tap  3  is provided comprising a tap body  13 , the tap body  13  having a through bore  14  therein for communicating the source of pressurized fluid from an orifice fitting  5  ( FIG. 8 ) in a flange  11  to a conventional manifold  4  ( FIG. 8 ). The manifold  4  can be secured to the flange  12  of tap  3  by use of bolts  16  (four of which are shown in  FIG. 8 ). One end of the tap body  13  is provided with threads  1 , preferably NPT, so as to mate with the threads in orifice fitting  5  in flange  11 . The other end of the tap body  13  is provided with a flange  12  for mounting to a conventional manifold  4  in  FIG. 8 . Interposed in through bore  14  is globe valve  18  ( FIG. 3 ), which is mounted on opposing stems (one of which 17 is shown in  FIG. 3 ), preferably operated by at least one of opposed handles  50 ,  52 . The provision of opposing stems permits the option of connecting the handle to the stem most conveniently located for operation, taking into account the close proximity of the taps of the invention to another tap, other equipment or supporting structure. Nuts  60 ,  62 , can be provided for securing the handles  50 ,  52  to the stems  17 ,  19 . It should be here noted, that it is not critical to the invention that both handles  50 ,  52  are supplied with the tap of the invention, as the globe valve  18  is suitably operable with only one handle. However, the provision of two handles as a kit with the valved tap of the invention facilitates the installation of the tap in the field, by allowing the installation technician to attach, and/or remove, any handle which is in too close in proximity to adjacent structure or equipment, including another tap. This is illustrated in  FIGS. 4 and 6-8 . Of course, the globe valve  18  could be operated with both handles  50 ,  52  ( FIG. 3 ), with handles of different design, or even with the handles removed so long as the force operating on at least one of the stems  17 ,  19  can rotate the globe valve  18  within its seat  54 ,  55 . Seal  57 , preferably formed of a high temperature material, such as GRAFOIL™ is provided to prevent leakage. Of course, as the globe valve  18  rotates, the fluid flowing through the bore  51  in the globe  18  can be regulated to the point of complete interruption of flow. In such a condition, the manifold  4 , and/or any other downstream equipment, such as a pressure transmitter  61 ,  FIG. 5  can be serviced, replaced, or repaired without interrupting the fluid flow in the pipeline  60 . 
         [0016]    As in the earlier patents referenced above, the tap body  13  may be provided with means to transfer the load from the NPT threads  1  to the body of the tap. One such manner is by use of the combined nut/sleeve  40 ,  42  ( FIGS. 3 and 8 ) in combination with shoes  7 ,  8 . Additionally, other manners of transferring the load from the NPT threads  1  to the tap body  13  as shown, for example in my U.S. Pat. Nos. 6,871,881; 7,458,614, or U.S. D541,645, or others, may be employed in connection with the claimed invention. 
         [0017]    The invention finds particular utility in pipeline transmission of fluids, especially in the oil and gas industry, but those skilled in the art, having studied the disclosure in connection with the appended drawings, may readily envision other fields of use. 
         [0018]    As many possible embodiments may be made of the invention without departing from the scope thereof, it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative, and not in a limiting sense.