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Publication numberUS612627 A
Publication typeGrant
Publication dateOct 18, 1898
Filing dateApr 26, 1888
Publication numberUS 612627 A, US 612627A, US-A-612627, US612627 A, US612627A
InventorsLudwig- Hirt
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Nenfabrik grevenbroich
US 612627 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

No. 612,627. Patented ont. la; 189s,


(N0 Model.)


Tm: Nomus Ptfvzns co. Puojoumo.. wAsmNaToN, n4 c.






SPECIFICATION forming part of Letters Patent No. 612,627', dated October 18, 1898. Application filed April 26, 1898. Serial No. 678,888. (No model.)

that the said device will rapidly and thor-` oughly withdraw from the said opening, and thus completely expose the latter. In the closin g devices heretofore generally employed for this purpose the opening and vclosing of the discharge are usually effected by means of a piston or plunger operated by any suitable pressure medium, such as steam, water, air, and the like. In devices of this class it has been found dii'licult, however, to prevent the contents of the receptacle from entering the pressure-cylinder. It has been found necessary to provide stuffingboxes, but these have proven an inconvenience in the practical working of such devices.

The object of this invention is to provide improved means for avoiding these difficulties and inconveniencies and the invention, therefore, consists in a closing device adapted to be operated by the pressure of air, gas, or of some suitable liquid, and so constructed that the pressure-cylinder will be closed so as to prevent the admission of liquid there# into from the discharge-duct, this' being effected by so adapting the flap or valve or other part which closes the discharge-open ing of the respective receptacle that the said flapor valve or other part will, inthe opened position, cover the mouth of the pressurecylinder, and thereby keep olf the outowin g liquid.

In the accompanying drawings, Figures l and 2 are vertical central sections illustrating the improved device.

In Figl, a is a short pipe or elbow provided at the bottom of a receptacle for the discharge of the liquid therefrom. This pipe or elbow has the improved closing device combined with it, the latter, as shown, consisting of thecylinder c, havingthe plunger orlpiston d movable therein and being provided with an inlet e for the admission of a suitable pressure medium. By the latter the plunger or piston d is normally held pressed against the discharge-opening of the receptacle, so as to directly close the same. A three-Way cock in the conduit connected at e, but not shown in the drawings, :may be employed for controlling the admission and discharge of the pressureV medium.

In emptying the receptacle the pressure medium of the closing device is allowed to escape, thus causing the plunger or piston d 'to be automatically lowered and to thereby expose the discharge-opening. The plunger or piston thereby itself fills the space within the cylinder c, so that in the position shown in dotted lines the contents of the receptacle will be allowed to freely escape through the pipe a, but not to enter the cylinder c.

In the construction shown in Fig. 2 the clos-v ing part consists of a flap 7s, connected by a lever h with the plunger or piston d of the pressure-cylinder c, the latter here being snpposed to extend y in a horizontal direction. Vhen the pressure medium is allowed to escape, the excess of pressure acting from within the receptacle will cause the fiap, together with the plunger or piston, tobe pushedback, thereby opening the discharge. At the same time the flap will arrive in front of the mouth of the cylinder and close the same, as shown in `dottedlines in Fig. 2, thus comn pletely locking and separating the cylindern space from the discharge-duct a.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. A closing device operated by piston un der pressure and intended for use in receptacles having a lower discharge, the said device being characterized in that the closing organ,

in the opened position, closes the pressuren cylinder toward the discharge-duct, substan= tially as and for the purpose described.

2. A closingdevice operated by piston un- IOC) der pressure and intended for use in receptacles having a lower discharge, thc said device being characterized in that the piston is connected by a lever mechanism with the closing organ (such as the Hap 71;), the latter in the opened condition of the receptacle acting` to close the mouth of the pressure-cylinder t0- ward the discharge-duct, substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.


Witnesses: v WM. EssENWnIN, Jon. BERKEY.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4065097 *May 17, 1976Dec 27, 1977Airco, Inc.Slot sealing valve for vacuum coating apparatus
US4190074 *Jul 8, 1977Feb 26, 1980Paul Wurth, S.A.Pressure equalization valve and technique for shaft furnace
Cooperative ClassificationF16K31/1635