US663936A - Balanced slide-valve. - Google Patents

Description

No. 663,936. Patented nec. la, |900.

' w. scHMoLKA.

BALANCED SLIDE VALVE.

(Application led Apr. 12, 1900.)

Patented Dec. I8, |900.

w. scHmoLKA, BALANCED SLIDE VALVE.

(Application led Apr. 12, 1900.)

2 Sheets-Sheet 2.

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UNTTED STATES y PATENT Ustica.

VILHELM SCHMOLKA, OF POLA, AUSTRIA-HUN GARY.

BALANCED S LlDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 663,936, dated December 18, 1900.

Application filed April 12, 1900. Serial No. 12,513. (No model.)

To @ZZ whom t may concern:

Be it known that I, WILHELM SCHMOLKA, engineer in the Royal Imperial Navy, a citizen of the Empire of Austria-Hungary, residing at Pola, Austria-Hungary, have invented certain new and useful Improvements in Balanced Slide-Valves, of which the following is a specification.

This invention relates to improvements in slide-valves, the object being to provide means for balancing plane slide-valves in engines of great horse-power, and more especially those used in connection With marine engines.

The invention contemplates arranging the valve and slide in such Way as to effect the steam admission from beneath or from Within the valve, While the exhaust is effected outside the valve. The valve is thus given a tendency to move outwardly instead of being compressed upon its seat, as heretofore, under the tremendous pressure of live steam to which it has been subjected. This outward movement, as it were, is retarded or balanced by what I term pistons, which are pressed in any suitable manner upon the valve, so that the latter is in perfect equilibrium between these two opposing forces.

The invention thus consists in the particular arrangement and combination of parts of the slide valve hereinafter described With reference to the accompanying drawings, which illustrate the invention in its preferred form embodied in the Well-known Penn slidevalve, and Wherein- Figure l is a longitudinal section through the steam-chest and slide-Valve. Fig. 2 is a plan view thereof, some of the parts appearing in section; and Fig. 3 is a cross-section on line A B,` Fig. 2. l

While I have mentioned steam as being the motive fluid, I have done so merely as an example for convenience in setting forth the nature of the invention, it being obvious that any motive iiuid applicable to the present system of slide-valves can be employed with my improved system.

Referring to the drawings, a is the slidevalve, b the steam-chest, and CZ the condenser or exhaust-receiver. The valve a has the central port c, Which serves as the admission-port for the live steam, and the steam-chest communicates with the exhaust or with a condenser d.

The constructional modications resulting from the reversing of the ordinary arrangement of the slide-valve consist merely in adapting the admission and exhaust ports to the same reversed order and causing the external lap of the steam-ports to take the place of the internal lap, and vice versa. The steam enters from the steam-chest b through port c, enters the cylinder by ports fu o, and is exhausted by ports w w.

To prevent the live steam Within thevalve ct from raising t-he latter from its seat on the cylinder-face, I provide a novel means, which in the present instance consists of four pistons h, arranged in the form of a square and having guides 'i fitting into stuffing-boxes in the upper portion of closed cylinders la, which latter are fixed in apertures of the valve-chest cover Z and adapted to be supplied with pressure by means of Water,compressed air, steam, or the like through suitable ducts t. The pistons 7L are made hollow and have inner ribs or splines h and rectangular base plates or shoes r, the latter extending beyond and laterally of the cylinders. Said base-plates are further reinforced by ribs m and move in suitable guides n. The under surface of the shoes r are made plane and perfectly smooth to reduce friction to the least possible minimum, and suitable grooves are provided, as shown, for lubricating purposes. The pressure upon the pistons 7i is so regulated as to balance the internal steam-pressure of the valve acting as a cushion for the valve and at the same time forcing the latter upon its seat with a suitable amount of pressure. The upwardly-directed pressure of the steam in the interior of the valve is balanced by the pistons h, and the pressure exerted by these latter upon the valve exceeds the internal pressure by from five to ten per cent.

Having thus described my invention, I claim- 1. The combination with a cylinder and a valve-chest, of a slide-valve provided with a cavity to receive the motive fluid, ports to permit of the passage of the fluid from the cavity into the cylinder, and ports to permit of the passage of the exhaust fluid from the IOO cylinder through channels in the valve to the exhaust or condenser, a rectangular cover for the Valve-chest havin g apertures, four closedtop cylinders fixed in apertures of the valvechest cover arranged in the form of a square, four pressure-pistons in said cylinders, and means for actuating said pistons, substantially as described.

2. The combination with the valve-chest cover having apertures, of the closed-top pressure-cylinders fixed in said apertures, stuffing-boxes in the upper portions of said cylinders,holloW pistons in said cylinders, guides on the pistons extending into the stuffingboxes, rectangular base-plates on the bottoms of said pistons below and extending laterally beyond the cylinders, and suitable guides and reinforcing-ribs for said shoes, the under surfaces of said shoes being smooth and provided with lubricating-grooves, substantially as described.

In witness whereof I have hereunto signed my name, this 13th day of February, 1900, in the presence of two subscribing Witnesses. WILHELM SCHMOLKA. Witnesses:

LEONHARD RoEsLERZ, HANS HOFMANN.

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