referring now to the drawings , trapping assembly 10 contains a column 12 which is filled with packing material 14 . suitable packing material includes a wide variety of materials , e . g ., metal cylinders , beads , spheres or particles which can suitably be made of stainless steel , nickel , nickel - copper , nickel chrome , cobalt chrome , etc . other packing materials are glass or resin beads , particles , etc ., sintered porous metal matrix of irregular or spherical metal , or silica or bonded - phase - silica and polymeric particles , beads , etc . it is also possible that the column can be unpacked and / or have an interior coating of a polymer such as are known in the art of chromatography . the column 12 is provided at top and bottom with suitable layers of frit 16 and 18 which can be a porous layer of stainless steel particles . the column 12 is shown encased in housing 20 which is provided with electric heating element 22 and thermocouple 24 . at the top of housing 20 is plate 23 . mounted atop plate 23 is solenoid 26 shown partially cut away in fig1 revealing windings 28 and axially moving shaft 30 reactive to the electric current flowing in the solenoid 26 . axially extending from shaft 30 is a pin 32 which extends through an axially located opening 34 in threaded bushing 36 . the bushing 36 is threadably engaged in a central opening located in valve block 38 located within housing 20 atop column 12 . located within valve block 38 below the bushing 36 is valve chamber 40 . at the top of valve chamber 40 is diaphragm 42 which is held in sealed engagement between the end of bushing 36 and annular shoulder 44 of the valve block 38 surrounding valve chamber 40 . the diaphragm 42 is ordinarily formed from a hard metal material . the annular edges of the pin 32 and opening 34 are rounded at the diaphragm end thereof . located within the valve chamber 40 in fig1 is a spherical metal ball 46 , e . g ., a ball bearing , the apex of which is welded to the center of the bottom side of diaphragm 42 . the ball 46 is adapted to engage and seal fluid exit orifice 48 located centrally at the base of valve chamber 40 . the metal of the valve block at the top of orifice 48 should be softer than that of the ball 46 to permit the latter to form a seat . extending through the housing 20 and valve block 38 into said valve chamber 40 is inlet 50 which permits introduction of fluid at high pressure into the valve chamber 40 . at the bottom of orifice 48 is a conical diverging section 52 of the nozzle formed therefrom . it is preferred that the angle of the cone be between about 50 to 70 degrees . a design of 65 degrees has been found to be satisfactory . at one side of conical diverging section 52 a flushing port 54 is provided . at the base of column 12 is column outlet 56 . normally , flushing port 54 is closed . electrical actuation of solenoid 26 provides axial movement to pin 32 against diaphragm 42 . when pin 32 moves downward , ball 46 seals orifice 48 . when fluid under pressure flows into inlet 50 , pressure is exerted on the bottom of diaphragm 42 . fluid pressures between 1000 and 6000 psi are typical . if the pressure on the diaphragm is sufficient , it and the ball 46 are lifted from orifice 48 and a gap between the ball and the orifice is formed . the diaphragm directs the flow of fluid through the valve chamber 40 and the gap and out through orifice 48 . the diaphragm seals off the high pressure fluid from ambient pressure regions within the apparatus . the active diameter of the diaphragm may be about 5 mm and the thickness may be approximately 0 . 14 mm and made of havar cobalt - nickel - chrome alloy ( although other metals such as 440c and 17 - 7 ph stainless steel can be used ). the 440c stainless steel ball may be 2 . 5 mm in diameter and affixed to the diaphragm by means of brazing ( although spot welding or laser welding might be employed ). orifice 48 may be about 1 mm in diameter . the fluid passing through orifice 48 continues to expand in conical diverging section 52 to a region of lower pressure . if the fluid is a gas , e . g ., carbon dioxide , held at temperatures and pressures above its critical point , the high density thereof increases its solubility parameter for the dissolved solute therein . when the fluid passes into the column 12 at a much lower pressure , the solute comes out of solution and is removed and collected ( which includes being absorbed , or otherwise retained on the packing within the column ). the fluid , e . g ., carbon dioxide at lower pressure can be removed from the column through outlet 56 . thereafter , the column can be flushed by introducing fluid through flushing port 54 and removing it through outlet 56 or the direction of flow can be reversed if desired . referring now to fig2 a semi - schematic arrangement of a preferred valve means of this invention is shown . the main feature of this embodiment is the use of an inverted , flattened conical diaphragm 100 within valve chamber 102 . the solenoid 104 , pin 106 , bushing 108 , valve block 110 , inlet 120 and flushing port 117 are similar to those described in connection with fig1 . in the valve means shown in fig2 the flattened conical diaphragm 100 is held in sealing engagement between bushing 108 and valve block shoulder 112 in a similar fashion to diaphragm of fig1 . the diaphragm 100 is mounted so that the apex 114 of the conical portion is pointed downward within valve chamber 102 . the active diameter of diaphragm 100 may be about 8 mm with a thickness at the outer edge similar to diaphragm 42 of fig1 . at the center the thickness may be about 0 . 9 mm with an included angle of about 120 ° where it contacts orifice 116 . the material is typically 17 - 7 ph stainless steel but could also be havar or 440c stainless steel . apex 114 is adapted to engage the seat formed in the upper end of orifice 116 . again , the metal of diaphragm 100 is harder than that of the seat to provide for sealed engagement when closed . the bottom surface 118 of bushing 108 is formed hemispherically . in case of power failure in the solenoid , the force of the fluid in inlet 120 will force diaphragm 100 upward to be held securely against surface 118 without significant deformation . optionally , pin 106 may be secured to diaphragm 100 . referring to fig3 a valve means is shown wherein a metal ball 200 is shown located above diaphragm 202 . the bushing 203 , solenoid 204 , pin 206 , valve chamber 208 , and valve block 210 are similar to those described in connection with fig1 . in this embodiment the pin 206 acting on and through ball 200 , forces the depressed center of diaphragm 202 against the orifice 212 in sealing engagement . diaphragm 202 is of similar geometry and material to diaphragm 42 of fig1 . the design may be an inversion of that in fig1 so as to eliminate the need for attaching the ball to the diaphragm . the bottom surface of bushing 203 is formed hemispherically in the same manner as shown by 118 for fig2 for the same purpose . fluid inlet 214 and a flushing port 216 are also provided . referring to fig4 a valve means is shown wherein the pin 306 is shown to be actuated by solenoid 304 . the pin 306 has a conical point or apex 314 adapted to engage the seat formed in the upper end 316 of orifice 312 in sealed engagement when closed . fluid at high pressure may be introduced through inlet 320 and exit through orifice 312 and its conical expansion nozzle . a diaphragm 302 in the form of an o - ring seal or washer is shown to be attached to the interior chamber surface 308 . the diaphragm 302 has a central aperture through which the pin 306 is located . the diaphragm 302 surrounds the pin 306 in sealing engagement which permits the pin 306 to slide axially in its movement to open and close orifice end 316 . suitable materials for the diaphragm 302 include fluorocarbon polymers and elastomers such as those sold under the trademarks teflon , kel - f or peek . in each embodiment of valve means of this invention , the diaphragm separates high pressure fluids from ambient pressure regions , locates the means that blocks the orifice , and lifts the means that blocks the orifice in response to force from the high pressure fluid acting against the diaphragm . the valve means of this invention are especially useful in supercritical fluid trapping means described herein and especially for use in the invention of poole et al . u . s . pat . no . 4 , 500 , 432 . such valves are , however , useful in any device where high pressure fluids are to be directed through a variable orifice to a region of lower pressure , and which are to be operated by electronic control ( e . g ., the connection between the outlet of a supercritical fluid chromatograph column and a detection means ). the valves illustrated herein are actuated by solenoid means ; however , such valves can be also be axially driven by linear motors , piezo electric or magneto - strictive linear movement devices , and electrically actuated , thermally expanded linear movement devices . a function which can be achieved in accordance with this invention is the expansion of fluids and fluid mixtures from high pressures to low pressures where the range of said fluids and mixtures includes supercritical fluids , nearly critical fluids , subcritical fluids , gases and liquids . devices of this invention may be used to maintain or control pressure and / or to sample fluid from extraction devices , chromatographs , or fluid reservoirs . one feature of the design is to allow minimal distances from the annular throat of the nozzle to possible downstream devices , e . g ., detectors ( like mass spectrometer inlet systems , flame ionization detectors ), supersonic molecular beam formation systems , and / or effluent collection devices . nozzle designs may also include annular - orifice , variable annular orifice , open orifice , compliant open orifices , or slit aperatures .