the preferred embodiment , a reciprocating downhole tubing pump generally identified by reference numeral 10 , will now be described with reference to fig1 through 5 . referring to fig1 , reciprocating downhole tubing pump 10 has a barrel 12 . a piston 13 transports a travelling ball valve 14 having a first ball seat 16 and a first ball 18 is axially movable along barrel 12 . a standing ball valve assembly 20 having a second ball seat 22 and a second ball 24 is positioned within barrel 12 . second ball 24 is confined within a ball cage 26 . an upstanding first pin 28 , in axial alignment with first ball seat 16 and first ball 18 of travelling ball valve 14 , is secured on top of standing ball valve assembly 20 . standing ball valve assembly 20 is further adapted with a rigid pivot linkage 30 , an offset transfer body 31 and a screen 32 . referring to fig3 , rigid pivot linkage 30 has a first end 33 and a second end 34 . a fulcrum 36 is positioned between first end 33 and second end 34 . when a downward force 38 is exerted on second end 34 , linkage 30 pivots about fulcrum 36 , lifting ball cage 26 and second ball 24 from an operative position to a circulating position . an upstanding second pin 40 is secured to second end 34 of linkage 30 and extends above standing ball valve assembly 20 adjacent to first pin 28 . referring to fig2 , when piston 13 transports travelling ball valve 14 onto standing ball valve assembly 20 , first pin 28 extends through first valve seat 16 , preventing first ball 18 from engaging first ball seat 16 in travelling ball valve 14 . upon contact with travelling ball valve 14 , second pin 40 acts upon pivot linkage 30 , pivoting ball cage 26 to a circulating position by preventing second ball 24 from engaging second ball seat 22 of standing ball valve assembly 20 , allowing an unfettered circulation of fluids through both travelling ball valve 14 and standing ball valve assembly 20 . referring now to fig4 , there is shown another embodiment of the reciprocating downhole tubing pump 10 . as in the embodiment shown in fig1 to 3 , reciprocating downhole tubing pump 10 has barrel 12 , travelling ball valve 14 having first ball seat 16 which receives first ball 18 , and standing ball valve assembly 20 having second ball seat 22 which receives second ball 24 . in this embodiment , axial travel of standing ball valve assembly 20 is limited by an underlying axial stop 42 . upstanding first pin 28 is secured on top of standing ball valve assembly 20 . first pin 28 is in axial alignment with first ball seat 16 on travelling ball valve 14 . an upstanding second pin 44 , positioned below standing ball valve assembly 20 , protrudes above axial stop 42 and is in axial alignment with second ball seat 22 on standing ball valve assembly 20 . a spring 46 is positioned between standing ball valve assembly 20 and axial stop 42 . a spring sealer 48 seals spring 46 at axial stop 42 . spring 46 biases standing ball valve assembly 20 in an operative position spaced above second pin 44 . referring to fig2 , where travelling ball valve 14 contacts standing ball valve assembly 20 and a compressive force 50 is exerted upon spring 46 , standing ball valve assembly 20 is moved to a circulating position with first pin 28 preventing first ball 18 from engaging first ball seat 16 on travelling ball valve 14 . further , second pin 44 prevents second ball 24 from engaging second ball seat 22 on standing ball valve assembly 20 , thereby permitting an unfettered circulation of fluids 52 through both travelling ball valve 14 and standing ball valve assembly 20 . the use and operation of the first embodiment of reciprocating downhole tubing pump 10 in accordance with the teachings of the preferred method , will now be described with reference to fig1 through 3 . referring to fig1 , where a blockage of sand or other impediment occurs below standing ball valve assembly 20 , piston 13 with travelling ball valve 14 is positioned within barrel 12 above standing ball valve assembly 20 as provided . referring to fig3 , as piston 13 with travelling ball valve 14 is lowered and contact is made with standing ball valve assembly 20 , upstanding second pin 40 exerts downward force 38 onto second end 34 of rigid pivot linkage 30 , lifting ball cage 26 and unseating second ball 24 from second seat 22 and opening standing ball valve 20 for circulation . referring to fig2 , similarly , upstanding first pin 28 unseats first ball 18 , opening travelling ball valve 14 for circulation . as both valves are in a circulating position , any blockages may then be cleared by the flow of fluid . the blockage is then removed from the tubing at surface . very little extra preparation is required to get the well into production again . this concept saves the need of removing the reciprocating downhole tubing pump , circulating or running a sand bailer , and then reinstalling the reciprocating downhole tubing pump . the use and operation of the second embodiment will now be described with reference to fig3 and 4 . referring to fig3 , where a blockage of sand or other impediment occurs below standing ball valve assembly 20 , travelling ball valve 14 is lowered onto standing ball valve assembly 20 and a compressive force 50 is exerted upon spring 46 to move standing ball valve assembly 20 to the circulating position as shown in fig4 . referring to fig4 , first pin 28 prevents first ball 18 from engaging first ball seat 16 on travelling ball valve 14 , and second pin 44 prevents second ball 24 from engaging second ball seat 22 on standing ball valve assembly 20 . it should be noted that compressive force 50 may be provided by the weight of a tubing string or by fluid under pressure . it should be noted that the dislodging and disabling of the ball on the travelling valve and the ball on the standing valve can be done in either order or simultaneously . in field trials the ball on the standing valve was dislodged and disabled first . the reason for this was that the ball on the standing valve is not subjected to the same fluid pressure , as the ball on the travelling valve is generally holding the fluid weight in the tubing . it is desirable to place a screen below the standing ball valve assembly . the screen serves two valuable functions . when fluid is flowing in an upward direction through the standing ball valve assembly , it prevents debris which cannot be pumped from entering and acts as a vortex to break up fluid composition prior to entering pump . when fluid is flowing in a downward direction , it acts as a spray nozzle . there are a number of advantages obtainable through the use of the method and apparatus , as described above : 1 . at the present time hours of rig time are spent during pump installation to circulate fluids to clean out sand fill or using bailers to bail sand accumulations to clean up the cellar . with the present invention , one can circulate the reciprocating downhole tubing pump into the desired landing depth . one way this may be done is by pinning the pump with shear screws . once in position , an anchor can be set and a force can be exerted upon the pump to shear the shear screws to open up the pump stroke . 2 . the ability to circulate enables you to pump fluid into the formation , to assist in opening up the perforations or the formation . 3 . if the formation is tight , you could circulate the entire hole over by sending fluid down tubing and up and out the casing . 4 . if a blockage should occur in the pump , above the pump or below the pump , the blockage can be addressed by direct circulation of fluids which flushes the tubing string of blockages . while blockages mainly occur below the pump , they sometimes occur elsewhere in the tubing string . 5 . the described invention can be used in conjunction with other tools , such as a scraper , a casing swabbing device or drill out equipment to accomplished several tasks in one operation . in this patent document , the word “ comprising ” is used in its non - limiting sense to mean that items following the word are included , but items not specifically mentioned are not excluded . a reference to an element by the indefinite article “ a ” does not exclude the possibility that more than one of the element is present , unless the context clearly requires that there be one and only one of the elements . it will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the claims .