US1833981A - Valve - Google Patents

Description

Dec. 1, 1931.

VALVE Filed April 15. 1929 I I f .F'gk' a J 1? 16 5' v a1 1' j tl/////////////////z ///4I l //4 1 x @Im,

Jjzmzzhn- F. WAGNER 1,833,981

Patented Dec. 1, 1931 Fm'rz waeimiacr"nnnmmnrcnrrmrminnyenmmux, nssrenoamo raar zwaenanmp (BE IN.

i 'VALVE Application filed A ril 15, 1929, Serial No.

relates to valves of the types described in my Patent No. 1,605,880, and in my co-pending applications Nos. 162,122 and 162,123, and more particularly to the'passage between the fluid supply and the equalizing chamber of such valves. The passage, as described in the last-mentioned application, is restricted at the point where the fluid under pressure issues therefrom, and is throtlO tled by a dog on the valve spindle. I have found that such a passage, the cross-sectional area of which is smallest where the throttling action of the dog occurs,-is not always quite satisfactory but that when the largest cross-sectional area is at the throttling point and the passage is restricted at a point in front of the throttling. point, the main valve does not hammer or chatter on its seat.

The duration of the throttling period is too long with the restriction at the end of the passage and so the main valve may be'subjected to accelerations which may causetzhat tering.

The throttling action begins at a clearance between the dog on the spindle and the corresponding abutment at the mainvalve which for a passage of circular section is about one-fourth of the passage diameter; Consequently, it is necessary that the dog and the abutment should move through this distance with respect to each other before the throttling action ceases. p

The action of the throttling on the main valve is twofold: It reduces the load on the main valve by reducing the pressure in the equalizing chamber, and it produces a re- My invention action in'upward direction which further re- 7 duces the load.

It is obvious that t ese forces will impart "to the main valve an upward acceleration which is a function of the durationof the throttling period, or, which is the same, of the relative displacement of the dog on the spindle and its abutment on the main valve. Consequently, such relative displacement should be a minimum.

In a restricted passage as described the maximum amount of fluid which flows to the equalizing chamber per unit of time, is lim- 50 ited by the cross-sectional. area of the restricsure of the fiuid reacts tainedfbetween the do g and sssfiaaapna m {Germmi n rn 16, 1955.

tion. The flow velocity'inthe restriction,

however, is high. which conflicts with the C011]:-

dition of small relative displacement and,-in 7 order to eliminate this, I the passage a maximum atthe point where beyond the restriction and thereby reduce tjhe velocityrof-the emu tosuch a'liniit th at-when the flui'd impinges on the dog of fthe" valve spinclleiits velocity is quite; a secondary con--' sideration andpractically only the static presbetween the d-og audits abutment on the a an aim vaflve a passage which-is w dest at the throttling point, very small relative displacement is obits abutment. By suitably determining the ratio ofareas,

area ofthe passage and the area at -its end',

chattering or hammering of the main valvej is absolutelyeliminated; r

up the accompanying drawings, ymi

.tyhes 10f valves and pe SageS are "illust V the dog en the valve spindle cooperates with a hollow cell -on the main 7 valve," i y r Fig.2 is a longitudinal se ctionof-the ho llow check, r

'3 is a plan viewef the check, viewed from below,

Fig. i is .an end three fi gu'res" being drawn ,FigsJ- S and S are axial corresponding to my c'O-pending application No. 162,122, and jmy Patent respectively Throughout th e 'drawi ngs, 1 'is the i valve" casing, 2 1s a linerin the'casi'n g', :31is the main' valve 3i7=l1i6l1- 111&l8$7 a sliding fit in the "liner;

to a larger scale,

I is 'i-ts seat in thecasing'flk is the auxiliary; valvewhl-ieliis seated i'n the-inam valve above.

a port 16, 5 is the equaliairlg chainbezr, are holesdnrthe liner 2:: I 1 n .7 10 isthe. va-lve-s:pindle '14eisladog-on ithe; valve 1 spindle, means are-provided: .for conI-f:

e'levatioii o'fithe, M

"I make the area of 5. it .is rthrottled, 1. e.,= I provide an extension x Byiproviding a passage of 'this type, i.

that f is, the. ratio of" the restricted cross-sectional 7 sectionsof valves 1 with said equalizing chamber and having 1a.

tion and with the drawbacks "and the main 7 the holes 8; The 17 of each tube, i an extension 19 which may be rectangularasv .Iib

necting the Spindle with the auxiliary valve, valve is provided with a dog or check against which the dog 14 abuts.

Referring now to Fig. 1, the check at the mainvalve is constituted by tubes 12 to which the fluid is admitted from the pipe13 throughpassage aforesaid isthe bore having a restriction l8, and

shown I but may also be circular if desired. is a flat face against which the dog 14 may abut. a

ing application N 0. 162,128, the dog 14 is act- In the valve described inmy said co-penda spindle oper- 1 In testimony whereof I aflix my's ignature. v

FRITZ WAGNER.

mg on a restriction'in the cavity of the tubes I 12, that is, sage ,1312,5, as mentioned on the narrowest part of the pas 1n the introduc present instance, however, the extension 19 reduces the velocity of the fluid. Obviously the'extension may beof any suitable size and shape main valve of a bridge at the top. of a chamber 9 in the,

' main'valve, andp1'8 thechamber 9with the equalizing chamber 5.

, Referring nowto'Fi-g. 5, the check on the is constituted by the lower face 21 are passages connecting The dog 14 is here replaced by :apiston 81' -making a sliding fit in the chamber 9 and having passages or bores 32." The spindlel0 Pe tratesthe top, and the bottonr'plate 11 V I of thechamber 9. .The bores 32 constitute the extension of the passageas' their total area is Q I as upper faceof the piston 31.:, yReferringno at some clearance, and 161s an annular larger-than that ofthe passages 17' in the tubes 12. Throttling occurs between {the :face ,21'at the top; of the chamber w to. Fig. ,6, this shows 'asolid dog 14 and a cavity 15- in the top of the chamber 9 which the dog is adaptedto enter? V pasi I sagebetweenthe spindle-1O and a hole in operatively connected 7 valve, a hollow member in said main valve 'cross sectional area of area of said perforation.

the topof the chamber 9. The area of the annular passage total area of the cavities 17in the tubes 12, is

the extension which prevents hammering or chattering as described. j V Icl'aimzfl f 1. A valve,-comprising a casing, means for supplying fluid under pressure to said'casing,

an equalizing chamber, a main valveand an auxiliary valve in said casing, a spindle 1 V with said auxiliary adapted to connectsaid fluid-supplying means perforationat its inner' end, a dog on said spindle adapted to throttle at a steadily in creasing rate the fluid issuing'from said'per- I 1 foration, and a'r'estriction in said member the 2. A valve, comprising'a casing, means for supplyingflu d under pressure to said casing, an equahzlng chamber, a malnvalveand an ,9 and the V which'is less than the set out. In the g which 'is larger than the Y Ice:

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