Патент USA US2133983код для вставки
Oct. 25, 1938. A. D. GASTON 2,133,983 _ VALVE Filed Aug. 26,- 1956 3 Sheets-Sheet 1 46 45 44 42 ~24 Z13’ / z . 49 _ \ '\ J - J \ ‘ ' 6- ,3 l4 , k9 A? I a‘ .60 zz - .___ 7 I \\\\ ‘\ a \'\\\ ~ ‘ ‘Li 9 m // " 5? . _. /5 )7 4.9‘ FIGURE-1 INVENTOR._ Oct. 25, 1938. 2,133,983 A. D. GASTON VALVE Filed Aug. 26, 1936 3 Sheets-Sheet 2 65 G IV/I I 12/726. I WW 4.§. . a 1 I 2%Z FIGURE-Z , INVENTOR. I Oct. 25,- 1938. A. D. GASTON ' ' 2,133,983 VALVE Filed Aug. 26, 1936 E , . s Sheets-Sheéi s -28 33 43 23 4:6 - - 32 44 24 4 FIGURE-4'. 4140 - a9 a .‘ I A 2 > 8 | *2? ':\26 / £30 @ $22 .'| ’ 4. 15 u 1" 2\\ 4' “w \ v//////// //,,, ' FTGLJRE- 3 INVENTOR. 2,133,983 Patented Oct; 25, .1938 UNITED STATES2,133,983PATENT- OFFICE VALVE Audley D. Gaston, IBaytown, Tex. _Application August 26, 1936, Serial No.,98,051 (CI. 137-139) of illustration only, it being understood that 18 Claims. This invention concerns valves for the control either type of end connection may be used with either type of stem. of the ?ow of ?uids in piping systems, and is intended to provide a valve for general indus trial service, so arranged that the valve may be ‘ The corresponding parts in all views of the ' drawings bear identical reference numbers. , 5 conveniently and economically lined throughout Referring now to the several ?gures, part 2 the ?uid passageway with suitable corrosion and, or, erosion resisting metals or alloys, the con is a valve body or housing provided with a boss 22, and ?anges I or conically tapered threads 4, ‘said body 2 being suitably machined to receive struction' being preferably adapted to permit the introduction of the proper type of lubricant back 10 of the parts comprisirg the lining to further and retain the various component parts. Part 10 segregate and protect the ‘body and operating ‘I is an inlet bushing or tubular member of cor parts from the harmful effects of the ?uid being handled, and to accomplish this purpose with the least possible turbulence in the ?owing l5 stream and therefore the least possible loss of rosion and, or, erosion ‘resisting material, pro ‘ vided with a seat 6, threads 5 and bearing 9. Part I1 is an outlet bushing or tubular member, sim ilarly of corrosion and, or, erosion resisting ma 15 terial provided with a bearing l6. Parts ‘I and I1, the inlet and outlet bushings respectively will be head, the valve being conveniently arranged for manual operation and control. , machined and ?tted as shown in Fig. 1 or Fig. 3 Thus, among the ultimate objects of this in vention is to provide a valve for general use 20 which shall have a greatly increased life in serv- ‘ ices handling ?uids of a more or less corrosive or chemically active nature, or which may be. depending upon the type of end connection de sired. In the ?anged design as shown in Fig. 1 20 parts 1 and I1 are provided with lugs 49 and ?at headmachine screws 50 to secure them in place in body 2,'whereas in_ the screw end de abrasive due to extremely high velocities or be cause they carry particles of hard substance or ' sign shown in Fig. 3 parts 1 and I1 are secured and made tight in body 2 by means’. of conically 25 tapered threads 4. Lugs 49 and ?at head ma chine screws 50 are not necessarily intended to have sufficient ‘strength to compress gaskets 3’ and I 8 to complete closure of the joint between " bushings I and I1 and body 2, chief reliance in 30 this, respect being placed in the customary com panion ?anges and bolts by, means of ‘which the 26 substances tending to cut or erode parts con tacted at intermediate velocities, or in services handling ?uids which may combine these cor rosive and erosive characteristics, and to accom— plish the desired increase in life with small by 30 draulic losses, all of which is brought out more particularly and in detail in the description hereinafter given of several embodiments of the valve is installed’in- the piping system. Part 8 invention illustrated in the accompanying draw ings, in which drawings is a cage or sleeve, or tubular body, also of suit‘ able corrosion and, or, erosion resisting material, 35 provided with internal ribs l I, which in turn sup port internal hub 14. Cage 8, ribs ll andhub It may be cast in one. integral part or may be sepa ' Fig. 1 shows a valve, embodying the features and objects" of. this invention in sectional ele vation, the section being taken along the longi tudinal center line of the valve. Fig. 2 is a sectional elevation of the same valve 40 as shown in Fig. l, the section being taken nor mal to the center line of the valve and through rately provided and assembled by welding or, other means, but in‘ any event they are prefer ably of a suitable corrosion and,_or erosion re sis‘ting material. Part 8 is machined to provide. threads 5, meshing with corresponding threads the center of the operating mechanism. - Figs. 1 and 2 show‘a valve having ?anged end 45 connections and rising stem. . on part ‘I, helical gear teeth l5, meshing with a 45 companion helix on solid stem 20, and'bearing , Fig. 3 is a similar view to Fig. 1 except that it illustrates a valve having screwed ends and non ~ rising .stem. ' Fig. 4 is a sectional elevation of the' valve shown in Fig. 3, the section being taken normal to the center line of the valve and through the center of the operating mechanism. ' > 40 _ surfaces at 9 and I6 whereguiding bearings are respectively provided on inlet bushing ‘I and outlet bushing IT. The hub I‘ is machined and provided with threads 5| to receive and retain 50 ' valve bolt l3. Disc I0 is fastened to bolt [3,» by means of the retaining nut l2. Bolt I3 is' screwed into threads 5| in the hub I 4 by means The combination of ?angedfend connections with rising stem and of screwed end connection ,of screw driver slot in its end and locked in position by lock nut l9- which is also provided 55 55 with non-rising stem were selected for purposes ~ 2 2,188,988 with screw driver slot. Disc l8, bolt l3, retaining nut l2 and lock nut l8 are also to be of suitable corrosion and, or, erosion resisting material, thus providing a passageway in which all parts that are contacted by the moving ?uid are of materials especially suited to give long life in the particular service. Moreover disc l8, hub 14 and lock nut l9 are so shaped as to provide, when assembled, a con 10 tour commonly known as streamlined, which, in combination with the carefully proportioned annular passageway between parts l8, I4 and I8, as assembled, and cage 8, forms a fluid passage way through the valve which causes the least 15 possible turbulence, the least possible deviation of the fluid particles from a straight line, and the least possible velocity changes, thus reducing hydraulic losses to a minimum. The annular space between cage 8 in combina 20 tion with inlet bushing 1 and outlet bushing l1, which will be made of suitable corrosion and. or erosion resisting material and which form a pro tective lining throughout the length of the ?uid passageway, and body 2 is advantageously ?lled 25 with a suitable grease or lubricant not only to facilitate the operation of the valve but also to serve as additional means for protectingbody 2 and external operating parts against any harmful eifects arising from or owing to the nature of the fluid being handled by the valve and the piping system in which it is used. A suitable grease or lubricant applied to the surface of a metal or ‘ alloy and so located that it cannot be readily re moved by dissolution or washing away is in itself an excellent protection against corrosion and it is one of the purposes of this invention to provide the annular space above mentioned and suitable means for replenishing the lubricant from time to time, which means will be described in further . detail later. - The cage 8 together with its integral parts II and I4, and the removable parts I8, l2, l3 and I8, constitute a revolving, endwise movable mem ber under control of the handwheel 28 through 45 valve stem 28 and helical gear thereon. It will be evident upon referring to the several ?gures, that turning handwheel 28 rotates cage 8 on bearings 8 and I8, bymeans of helical gear I5 and valve stem companion helix, thus‘ bringing into play rotation of handwheel 28 causes cage 8 to move to the open position, shoulder 52 on outlet bushing l1 being provided as a stop to limit the opening movement to the full open position beyond which no further gain in flow can be expected. Any further counterclockwise rotation of handwheel 28 will lift valve stem 28 until its shoulder con tacts shoulder 26 forming an auxiliary seal under packing 21. Since both in the case of screw threads 5 and helical gear I5 the tangent of the 10 helix' angle is less than the coeil‘lcient of friction valve stem 28 is locked with its shoulder tightly closed against shoulder 26 on bonnet 24 and pack ing 21 may be safely'removed for renewal while the valve is in service and wide open under full 15 pressure. In this design handwheel 28 is mounted on solid valve stem 28 and secured in the usual ’manner by means of a key, washer and nut. In Figures 1 and 2 illustrating the rising stem design, the valve stem is divided into two parts, 20 solid stem 28 and hollow stem 31, which are keyed. together by means of sliding key 34 and keyways provided therefor. Bonnet 24 is provided with in ternal threads 25 and machined shoulder 26, and the hollow stem 31 is provided with companion 25' threads and shoulder, so that upon clockwise ro tation of handwheel 28 the hollow ‘stem 31 moves down and upon counterclockwise rotation moves up, the upward movement being stopped upon contact of the shoulder on the stem with shoulder 30 26, when the valve is in the wide open position. Contact of shoulder on the stem with shoulder 26 forms an auxiliary seal under packing 21 mak ing it possible to remove gland'follower 33 and gland 32 and renew packing 21 with the stem in 35 this position and the valve wide open and under full pressure. ,Key 34 is a long key arranged to ,slide in both the keyway in solid stem 28 and hollow stem 31. . Key 34 is provided with a hook on its upper end so as to be readily removable 40 through top of hollow stem '31 upon removal of lubricating plug body 42. In assembling the valve, key 34 isv temporarily inserted in the key ways and handwheel 28 is rotated counterclock wise until cage 8 contacts shoulder 52. Then they 45 handwheel is rotated clockwise a suilicient amount to back cage 8 away from shoulder 52 approxi mately one eighth of an inch; Key 34 is then removed and handwheel 28 rotated counter screw threads 5 between inlet bushing 1 and cage 8 causing an endwise movement of the valve disc l8 to its seat 6, and conversely an opposite clockwise until shoulder 28 is contacted by the shoulder on hollow stem 31. Key 34 is then 50 permanently inserted at the ?rst angular match rotation of handwheel 28 reverses the function of ing point of keyways in solid stem 28 and hollow the helical gears and screw thread 5, causing valve. stem 31. Thus the opening of the valve is limited 55 disc l8 to move away from its seat, thus closing by shoulder 28 which forms the auxiliary seal 55 under packing 21 making it possible to repack or opening the valve as the operator may desire. The tangent of the helix angle of thread 5 and the gland when the valve is wide open and in the tangent of the helix angle of helical gear 15 _ service under pressure. Since the tangent of the may be, and preferably will be, selected'to be less helix angle of screw threads 25 is less than the than the coe?icient of friction of the contacting _ coefilcient of friction, hollow stem 31 when in this materials so, that ‘when valve is closed with valve top position is locked,with its shoulder in contact 60 disc 18 firmly seated against valve seat 6, cage 8 against shoulder 28 en- bonnet 24, and yoke 35 is doubly locked against any change in position ‘may safely be removed if desired to facilitate the‘ through the locking action of threads 5-and of removal of gland parts 32 and 33 for renewing 65 ‘ packing 21. Part 48' is an end thrust washer or Part 24 is a valve bonnet held in place by ca’p screws or studs 23 and "provided with gasket 2|, gland 32, gland packing 21 and gland'i'ollower 33. Gland follower 33 is provided with studs 48 bearing limiting the movement of solid stem 28 in helical gear l5. _, '_ j and nuts 41- for adjustment or removal for re packing as the case may be. - In Eigures 3 and 4, illustrating the non-rising stem design, bonnet 24 is provided with a ma an upward direction. "Referring to Figures 1 and 2,,a top ?ange and bearing is provided on bonnet 24 to receive hand wheel 28, which is secured by means of handwheel retaining ring 29 and cap screws 38. Yoke 35 is fastened to handwheel 28 bymeans of cap screws 3| and fitted with feather keys 33 which are chined shoulder 28, a, companion shoulder being ' engaged in keyways 38 in hollow stem 31. Thus 75 machined on‘ solid stem 20. A counterclockwise the operation of handwheel 28 in either clockwise 5, 2, 133,988 3, or counterclockwise direction causes a‘ corre sponding rotation of hollow stem 31 and of solid of the operator by means of the handwheel 28 stem 20, thereby controlling the movement of the valve ‘within the body. In practice, hollow rising stem 31 may be cali brated‘and marked along the edges ‘of keyways Attention is threads 5 may bushing l1 and cage 8, without and helical gear I5. ‘ called to the fact that screw‘ be introduced connecting outlet cage 8, or connecting body 2 and destroying the functional opera 38 from zero to one hundred percent in suitable tion of' the various parts, the'location shown~ subdivisions thereof, using top of key 38 as an ‘being chosen because expansion strains due to indicator, to show percentage opening of valve 10 disc It) with respect to valve seat 6. Thus, hollow temperature differences are eliminated. The following are given as examples of the rising stem 31 becomes an indicator which may corrosion and, or erosion resisting metals or alloys be observed from a distance to tell whether the of which parts 1, 8, III, II, l2, l3, l4, l1 and valve is in the closed or open position, and, upon I9 may be made: Monel metal; eighteen eight‘ closer inspection, the percentage opening at which chrome nickel steel; ‘stainless steel of either the the'valve is set. ’ - Hollow stem 31 is provided with conically ta~ pered threads in its top to accommodate lubri hardenable or non-hardenable variety; acid re 15 sisting brass, that is to say brass of the type composition copper, 10% tin and 5% lead; cating plug body 42. This plug body 42 is ?tted ulow chrome 85% nickel cast iron; high chrome cast with, lubricating plug 45 which is held in place 20 by means of conically tapered threads 39... Gland ,1’ iron; cast hard chemical lead; hard'brass or Feast iron. For corrosive services where erosion is 44 is provided with a shoulder 43 which prevents oi‘ consequence the hardenable stainless steels- or the plug 45 from beingtotally unscrewed‘ from high chrome, cast iron, may be used and heat plug body 42. Lubricating plug 45 is sealed by treated for extremely high resistance to abrasion. gland packing 41 and gland 44 and is ?tted with Although the parts 1, 8, 10, ll, l2, l3, I4, l1 and a lubricating ?tting 46, comprising a ball check‘ I9 have been described above as being formed of (not shown) and a lubricant passageway 40. corrosion or erosion resisting metals, it will be Thus, to lubricate the inside working parts of evident from the foregoing description that the the valve, lubricating plug 45 is ‘partially un invention is not confined to use of the said metals, " screwed" from conically tapered threads 39 and 30 seated against shoulder 43. A lubricating pres‘ since it is evident from the foregoing description’ that the said parts may be formed from any sure gun is then applied in the usual manner‘ metal or material suitable for use under the con forcing lubricant through tapered threads 39 _- which-are in a partially opened position. Since keyways in'solid stem 20 and hollow stem 81 are ditions under which the device is to be vused. ‘The following services in which metals or alloys of the above type maybe expected to greatly pro- " slightly deeper than necessary to accommodate long'the useful life of ‘the valve over what is cur the key 34, passageway is,provided for lubricant rently obtained arev given as examples: natural from the space below lubricating plug 42 to-the gasoline, natural 'gas and absorber oil, produced space below hollow stem 31. Thrust washer 49’ or circulated innatural gasoline plants particu is loosely ?tted in boss. 22 and around solid stem ; larly if the ?eld is in a sour crude district; inter 28 so that lubricant may pass through to all the space around the helical gears and between inlet bushing 1, outlet bushing 11 and body 2. After ~ replenishing the lubricant as above set forth plug 45 is returned by means of wrench or pliers to a 45 tight ?t in tapered threads 39, thus closing the system without placing ?nal reliance on the ball check, which is part of lubricating ?tting 46. An mediate products-in an oil re?nery such as un treated naphtha or refined oil distillates, acid sludge, water washafter acid treating, caustic 40 and doctor solution lines and weak acid; mine waters; chemical plant products handling ?uids -which are destructive to-iordina'ry iron or steel 45 parts; salt water from salt wells; sea water in marine services; sour crudes from oil wells or crudes from wells where salt water and gritty particles of sand are entrained; gas repressuring important feature of the construction is that gland packing 21 is separated from the corrosive ?uid by the lubricant interposed between it and ‘plants where the-gas is' not perfectlyfree from the ?uid passageway. Packing 2.1 is therefore sulphur compounds or hydrogen sulphide. kept lubricated and in an ideal operating condi The metals and alloys given above together tion. Although the lubricating device is shown with the services mentioned are merely intended mounted on the top of the stem, it need not to be illustrative since it is obvious that many necessarily be at that point but may be screwed ‘ other metals or alloys or other materials may be into the body as is shown in Fig. 4 or at any selected to meet the needs of a particular service other suitable location. It is to be understood and that there are many other services .wherein that any other- suitable means of introducing this invention will advantageously function. It lubricant‘may'be used in conjunction with this is, not the intention to limit the invention to 60 valve. ‘ the use of materials, or to the services to which In Fig. 4 illustrating the non-rising stem design ' it may be applied, given as examples. ~ the lubricating device will be screwed directly into body 2, as shown, or in any other convenient 65 Having described my invention, I claim: 1. A device for controlling the ?ow of ?uids ' locationrrbut functions otherwise in a similar comprising a housing provided with an external manner to the one described above. boss, the housing having secured therein inlet 65 and outlet bushings, one of said bushings being _. 1 I It is. to be noted that .the cage 8 is sup‘ rted internally of'the housing 2 by the bushings 1 provided with screw threads to mesh with an and I1 and that the longitudinal axes of the, internally supported and guided concentrically 70 cage 8', bushings 1 and I1 and the streamlined valve are-all‘ in the same straight line, so that upon rotation of the sleeve 8 about its'axis the streamlined valve is moved along the same axis by screw threads 5 towards or away from the valve seat 5, said movement being under control rotatable and endwise movable cylindrical cage provided with corresponding companion threads 70 and with a valve attached and ?xed concentri cally therein, said cage being further provided with helical gear teeth cut on the‘external cy lindrical surface thereof, the said-bushings and cage providing a lining through the housing 75 2,188,988’ 4 throughout the ?uid. passageway, a helix for the gear teeth on the cage, said helix being ?tted within said boss, and a stem attached to said helix for rotating said helix. ' 2. A device for controlling the ?ow of ?uids .comprising a housing, two ‘bushings extending within the body of said housing, one of said bushings serving as an inlet for ?uid and the other serving as an outlet for ?uid, a tubular body 10 within said housing connecting said two bushings, said two bushings and said tubular body' forming a continuous passageway and said tubular body being rotatable about its axis and endwise mov able; a valve in said tubular body, spaced from 15 the interior-wall thereof, and movable there with; a seat for said valve in said passageway, and means for rotating said tubular body and for imparting endwise motion thereto operable from the exterior of said housing to move said '20 valve towards or away from its seat. 3. A device for controlling the ?ow of ?uids comprising a housing, two bushings extending within the body of said housing, one of said bush ings serving as an inlet for ?uid and the other 25 serving as an outlet for ?uid, a tubular body within said housing connecting said two bush ings, said two bushings and said tubular body forming a continuous passageway and said tubu lar body being rotatable about its axis and end 30 wise movable; a, valve in said tubular body, spaced from the interior wall thereof, and movable outlet means extending within the said housing with their innermost ends separated, a tubular body within the housing connecting said tubular inlet and outlet means, said tubular inlet and outlet means and said tubular body forming a continuous passageway and said tubular body be ing endwise movable without destroying the con tinuity of said passageway; a valve in said tubu lar body, spaced ~from the interior wall thereof, and movable therewith; a seat for said valve in 10 said passageway, and means operable from the exterior of said housing for moving said tubular body endwise to move said valve towards or away from its seat. . '7. A device for controlling the flow of ?uids 15 comprising a housing, tubular inlet means and outlet means extending within the said housing with their innermost ends separatedya tubular body within the housing connecting said tubular inlet and outlet means, said tubular inlet and 20 outlet means and said tubular body forming a continuous passageway and said tubular body being rotatable about its axis and endwise mov able; a valve in said tubular body, spaced from the interior wall thereof, and movable therewith; 25 a seat for said valve in said passageway, and means for rotating said tubular body and for im— . parting endwise motion thereto operable from the exterior of said housing to move said valve to wards or away from its seat. 30 - 8. A device for controlling the ?ow of ?uids comprising a housing, tubular inlet means and therewith; a seat for said valve in said passage- _ way, means engaging the exterior of said tubular outlet means extending within the said housing body operable from the exterior of said ‘housing with their innermost ends separated, a tubular for rotating said tubular body, and means for body within the housing connecting said tubular 35 imparting endwise motion to the tubular body inlet and outlet means, said tubular inlet and outlet means and said tubular body forming a upon rotation thereof to move said valve towards or away from its seat.’ - 4. A device for controlling the ?ow of ?uids comprising a housing, two bushings extending 40 within the body of said housing, one of said bush ings serving as an inlet for ?uid and the other serving as an outlet for ?uid, a tubular body within said housing connecting said two bushings, said two bushings and said tubular body forming 45 a continuous passageway, said tubular body and each bushing with which'it is connected‘ ?tting one within the other in a relationship permitting continuous passageway and said tubular body be ing rotatable about its axis and endwise mov able; a valve in said tubular body, spaced from 40 the interior wall thereof, and movable therewith; a seat for said valve in said passageway, means engaging the exterior of said tubular body op erable from the exterior of said housing for ro tating said tubular body. and means for im 45 parting endwise motion to the said tubular body upon rotation thereof to move said valve towards or away from its seat. } ' / 9. A device for controlling the ?ow of ?uids comprising a housing, tubular inlet means and 50 to be moved endwise; a valve in said tubular ‘ outlet means extending within the said housing 50 body, spaced from the interior wall thereof, and their innermost ends, separated, a tubular movable therewith‘; a seat for said valve in said with body within the housing connecting'said ‘tubular passageway, means engaging the exterior of said tubular body operable from the exterior of said inlet and ‘outlet means, said tubular inlet'and housing for rotating said tubular body, and means outlet means and said tubular body forming a 55 for imparting endwise motion to the tubular body continuous passageway, said tubular body and of’ said tubular-inletand outlet means with upon rotation thereof tomove said valve towards each which it is connected ?tting one within the other or away from its seat. ' < in a relationship permitting said tubular body to 5. A device for controlling the ?ow of ?uids be rotated about its axis and to be moved end’ 60 comprising a housing, tubular inlet means and 60 wise; a‘valve in said tubular body, spaced from outlet means extending within the said housing interior wall thereof, and movable therewith; with their innermost ends separated, a tubular the a seat for said valve in said passageway; means body within the housing connecting said tubular engaging the exterior of said tubular body oper inlet and outlet means, said tubular inlet and able from the exterior of said housing for ro outlet means and said tubular body forming a tating said tubular body, and means for impart continuous passageway ‘and said tubular body be ing endwise motion to the tubular body upon ro ing endwise movable without destroying the con tation thereof to move said valve towards or away tinuity ' of said passageway; a valve and seat said tubular body to be rotated about itsaxis and therefor positioned in said passageway and one" from its seat; " - operablev from the exterior oi.’ said housing for moving said tubular body endwise to vary the dis three sections within said body, the central of 10. A device for controlling the ?ow 0i ?uids 70 70 of which moves with said tubular body, and means , comprising a body and conduit means comprising tance between said valve and valve seat. 6. A device for controlling the ?ow of ?uids 75 comprising a housing, tubular inlet means and said three sections being supported by the two > end sections and endwise movable without de stroying the continuity of said conduit means; a 75 5 2,138,983 valve within said movable section, spaced‘ from the interior wall thereof, and movable ‘there with,‘ a seat for said valve on one of said end sections within said conduit means, and means for moving said movable section endwise to move said valve towards or away from its seat. 11. A device for controlling the ?ow of ?uids comprising a body and conduit means comrising three sectionswithin said body, the central of '10 said three sections being supported by the two end sections and rotatable about its axis and end-_ wise movable without destroying the continuity of said conduit means; a valve within said mov able section, spaced from the interior wall there 15 of, and movable therewith, a seat for said, valve on one of said end sections within said conduit means, and means for rotating and endwise mov ing said rotatable section to move said valve to wards or away from its seat. 20 ' 12. A device as'de?ned in claim 2, in‘ which the two bushings, tubular body and valve are of corrosion resisting material. 13. A device as de?ned in claim 2, in which ‘the two bushings, tubular body and valve are of 25 erosion resisting material. . 14. A device as ‘de?ned in claim 5, in which the tubular inlet and outlet means, the tubular body and the valve are of corrosion resisting ma terial. 15. A device as de?ned in claim 5, in which the tubular inlet andioutlet means, the tubular body and the valve- are of erosion resisting ma terial. ' i 16. A deviceas de?ned in claim 10 in which the three sections and valve are of corrosion re sisting material. > 17. A device as de?ned in claim 10 m which‘ the three sections and valve are of erosion resist 10 ing material. 18. A device for controlling the ?ow of ?uids comprising a body and conduit means compris ing three sections within said body, the central of said three sections being supported by the two end sections and endwise movable without de 15 stroying the continuity of said conduit means; a valve within said movable section, spaced-from the interior wall thereof and movable therewith, ‘a seat for said valve on one of said end sections within said conduit means, means for moving 20 said movable section endwise to move said valve towards or away from its seat, the exterior sur face'of said conduit means being spaced from the interior surface of said body to provide a space - for the reception of lubricant and means for in troducing lubricant into said space. AUDLEY D. GASTON.