US129794A - John h - Google Patents

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Publication number
US129794A
US129794A US129794DA US129794A US 129794 A US129794 A US 129794A US 129794D A US129794D A US 129794DA US 129794 A US129794 A US 129794A
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Prior art keywords
steam
ring
slide
valve
valves
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K39/00Devices for relieving the pressure on the sealing faces
    • F16K39/02Devices for relieving the pressure on the sealing faces for lift valves
    • F16K39/022Devices for relieving the pressure on the sealing faces for lift valves using balancing surfaces

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  • Our invention has for its object the improvement, both as regards simplicity in construction and practical efficiency, of disburdened in g, in which the line Arepresents the face of the steam-cylinder; B, the inner face of the steam-chest cover; and D, the slide-valve, on the back of which is cast an annular rib, an, adapted to the plain cylindrical ring-b, the pressure of steam ,on the lower edge of the latter being exerted on an area equal to that of the upper edge of the ring, which bears
  • the French patent of Disgrange (March 10, 1851) affords an early example of disburdened or so-called It will be understood, therefore, that no new principle is involved in our invention, which is restricted to a specific construction of parts and adaptation of these parts to each other.
  • the ring b unlike the rings heretofore used for removing the excess of pressure from slide-valves, is perfectly plain and cylindrical; hence it is easily cast and readily finished by boring and turning.
  • a ringfitted to the interior of this rib would demand a flange against which the steam could exert an upward pressure, and one of the objects of our invention is to dispense with this .fiange.
  • a spring, G bears upon a central projection, h, of the valve, extends across the annular rib a, and each end enters a groove in the ring 12, upon which the spring exerts a constant upward pressure, the spring being always maintained in its proper position by its adaptation to recesses a: in the upper edge of the annular rib.
  • the ring a extends very nearly to the steamchest cover; hence the valve is prevented from being forced from its seat when steam is excluded from the chest, and the movement of the engine is continued, as in case of locomotives running down grade.
  • valve In case of any derangement of the ring it can be readily removed, and the valve may be permitted to operate as an ordinary slide-valve until it is convenient to replace the ring or apply a new one.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Turbines (AREA)

Description

' v J. H. COOPER & A. n. E MERY.
Improvement in Slide-Valves for Steam-Engines. No. 129,794.
Patented July 23,1872.
1 Witnesses. I
against the steam-chest cover.
balanced slide-valves of this class.
IMPROVEMENT IN SLIDE-VALVES FOR STEAM-ENGINES.
Specification forming part of Letters Patent No. 129,794, dated July 23, 1872.
Specification describing Improvements in Slide-Valves for Steam-Engines, invented by JOHN H. Ooornn and ABRAM DEMERY,
. both of Philadelphia, Pennsylvania.
Improvements in Slide-Valves for Steam- Engines.
Our invention has for its object the improvement, both as regards simplicity in construction and practical efficiency, of disburdened in g, in which the line Arepresents the face of the steam-cylinder; B, the inner face of the steam-chest cover; and D, the slide-valve, on the back of which is cast an annular rib, an, adapted to the plain cylindrical ring-b, the pressure of steam ,on the lower edge of the latter being exerted on an area equal to that of the upper edge of the ring, which bears The French patent of Disgrange (March 10, 1851) affords an early example of disburdened or so-called It will be understood, therefore, that no new principle is involved in our invention, which is restricted to a specific construction of parts and adaptation of these parts to each other. The ring b, unlike the rings heretofore used for removing the excess of pressure from slide-valves, is perfectly plain and cylindrical; hence it is easily cast and readily finished by boring and turning. We are enabled to make the ring of this simple and inexpensive shape by adapting it to the exterior of the rib a. A ringfitted to the interior of this rib would demand a flange against which the steam could exert an upward pressure, and one of the objects of our invention is to dispense with this .fiange. While the ring I) can slide freely on the rib a it is accurately fitted to the latter, so that there is but little chance of the steam penetrating between the two; but to prevent the possibility of such penetration of the steam we place, in grooves formed in the rib a, light rings, which, owing to their expansible property, bear with a constant pressure against the interior of the ring b. In order to insure the contact of the ring against the steam-chest cover under all circumstances-a spring, G, bears upon a central projection, h, of the valve, extends across the annular rib a, and each end enters a groove in the ring 12, upon which the spring exerts a constant upward pressure, the spring being always maintained in its proper position by its adaptation to recesses a: in the upper edge of the annular rib. The ring a extends very nearly to the steamchest cover; hence the valve is prevented from being forced from its seat when steam is excluded from the chest, and the movement of the engine is continued, as in case of locomotives running down grade.
In case of any derangement of the ring it can be readily removed, and the valve may be permitted to operate as an ordinary slide-valve until it is convenient to replace the ring or apply a new one.
We claim-- 1. The combination, with a slide-valve, of a plain cylindrical ring, b, adapted to the exterior of an annular rib on the said valve, as set forth. I
2. The spring G, adapted to the valve and to the ring 12, as specified.
In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.
JOHN H. COOPER. ABRAM D. EMERY.
Witnesses WM. A. STEEL, H. HoWsoN.
US129794D John h Expired - Lifetime US129794A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110131389A1 (en) * 2008-07-24 2011-06-02 Nagravision Sa Method for updating data in memories using a memory management unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110131389A1 (en) * 2008-07-24 2011-06-02 Nagravision Sa Method for updating data in memories using a memory management unit

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