US389737A - Balanced slide-valve - Google Patents

Balanced slide-valve Download PDF

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US389737A
US389737A US389737DA US389737A US 389737 A US389737 A US 389737A US 389737D A US389737D A US 389737DA US 389737 A US389737 A US 389737A
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Prior art keywords
valve
slide
steam
chest
view
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/16—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with special arrangements for separating the sealing faces or for pressing them together
    • F16K3/18—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with special arrangements for separating the sealing faces or for pressing them together by movement of the closure members
    • F16K3/184—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with special arrangements for separating the sealing faces or for pressing them together by movement of the closure members by means of cams
    • F16K3/186—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with special arrangements for separating the sealing faces or for pressing them together by movement of the closure members by means of cams by means of cams of wedge from

Definitions

  • the object is to produce a slide-valve which shall be so constructed that the friction and consequent wear of the parts while working will be greatly reduced, if not entirely over-v come; furthermore, to produce a slide valve in which steam leakage will be obviated, thus rendering frequent packing of the stuffingboxes unnecessary; furthermore, to produce a slide-valve in which but a very small proportion of the steam-power will'be lost from condensation of the steam; and, finally, to produce a slide valve which shall be simple of construction, eflicient and durable in use, and comparatively inexpensiveof production.
  • the invention con sists in the combination, with the cylinder,ofa valve-chest seated thereon,and having suitable openings formed in the bottom to allow the steam to enter the cylinder, and an opening for the escape of the exhaust-steam; furthermore, in the combination,with the said valve-chest,of a sliding valve designed to fit within and move upon the bottom of the valve-chest,and having openings corresponding to those in the valveseat,whereby upon each stroke of the piston the valve will be made to open and close the parts alternately, and thus supply the steam to the cylinder at proper intervals; furthermore, in the combination, with the said valve-chest, of a bonnet or plate secured thereto and designed to hold the slide-valve in position within the said chest; furthermore, in the combination, with the slide-valve, of a valve-stem connected therewith and extending to and connecting with the crank-levers operated by the piston, whereby the said valve may be made to perform the function for which it is designed; and, fiually
  • Figure l is a perspective view of the valvechest with the top and one side removed,showing the arrangement of the ports.
  • Fig. 2 is a perspective view of the slide-valve, also showing the arrangement of the ports.
  • Fig. 3 is a vertical sectional view of the valve, showing the openings for the bolts used in securing the valve-stem in position. view of the same, showing the grooves for supplying oil to the valve-seat.
  • Fig. 5 is a top 'plan view of the bonnet or plate for holding the valve in place.
  • Fig. 6 is a side elevation of one of the sides of the valve'chest.
  • Fig. 7 is a side elevation of the valve-stem.
  • Fig. 8 9, 10, 11, and 12 are detail views of various parts of the apparatus, which will be described as they occur in the specification.
  • Fig. 13 is a side elevation showing the apparatus put together.
  • Fig. 14 is a sectional detail view of the end of the head of the valve-stem, and
  • Fig. 15 is a vertical sectional view of the device with theparts assembled.
  • Fig. 4 is a top plan

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)
  • Sliding Valves (AREA)

Description

(No Model.) 4 Sheets-Sheet '1.
BALANGED SLIDE VALVE.
' No. 389,737. Petented Sept. 18,1888.
WITNESSES IN T e7 '80 MM.
(No Model.) 4 Sheets-Sheet 2.
G. W. CISCO.
A BALANCED SLIDE VALVE. "No; 389,737. Patented Sept. 1,8,1888.
WITNES- N. PETERS. Pvwm-Limu nphar, Walhinglnn, 0.42.
(No Model.) 4 Sheets- Sheet 3.
G. W. 01800.- V BALANCED SLIDBVALVE. 188889.787] 8 Patented Sept. 18, 1888.
(No Model.) 4 sheets sh'et 4.
G. W.. 01800. BALANCED SLIDE VALVE. No. 889,737. l Patented Sept. 1.8, 1888.
, WITNESSES UNITED STATES PATENT OFFICE.
GEORGE WASHINGTON OISGO, OF MONTVALE, NEW JERSEY.
BALANCED SLIDE-VALVE.
SPECIFICATION forming part of Letters Patent No. 389,737, dated. September 18, 1888.
Application filed April 2, 1888. Serial No. 260,288.
employed on railway-locomotives.
The object is to produce a slide-valve which shall be so constructed that the friction and consequent wear of the parts while working will be greatly reduced, if not entirely over-v come; furthermore, to producea slide valve in which steam leakage will be obviated, thus rendering frequent packing of the stuffingboxes unnecessary; furthermore, to produce a slide-valve in which but a very small proportion of the steam-power will'be lost from condensation of the steam; and, finally, to produce a slide valve which shall be simple of construction, eflicient and durable in use, and comparatively inexpensiveof production.
Heretofore slide-valves as constructed have been defective in that the steam, entering from the top of the chest, presses on the valve and tends to grindit upon its seat, and thus create a large amount of friction, also in rushing from one port to another to lift the valve from its seat, causing it to press the Valverstem against the stuffingboX, resulting in uneven wear. Furthermore, the large amount of space in the steam chest tends to facilitate the rapid condensation of steam, a very troublesome feature and one that is a source of constant annoyance to engineers. I
It' is the object of the present invention to overcome the objections by doing away with all of thespace in the steam-chest not actually employed by the valve and in constructing a steam-chest in which only the amount of steam requisite to drive the engine will be admitted; furthermore, to supply means for the escape of the condensed steam at all times without the necessity of the engineer having to attend to it,
(No model.)
With these objects in view the invention con sists in the combination, with the cylinder,ofa valve-chest seated thereon,and having suitable openings formed in the bottom to allow the steam to enter the cylinder, and an opening for the escape of the exhaust-steam; furthermore, in the combination,with the said valve-chest,of a sliding valve designed to fit within and move upon the bottom of the valve-chest,and having openings corresponding to those in the valveseat,whereby upon each stroke of the piston the valve will be made to open and close the parts alternately, and thus supply the steam to the cylinder at proper intervals; furthermore, in the combination, with the said valve-chest, of a bonnet or plate secured thereto and designed to hold the slide-valve in position within the said chest; furthermore, in the combination, with the slide-valve, of a valve-stem connected therewith and extending to and connecting with the crank-levers operated by the piston, whereby the said valve may be made to perform the function for which it is designed; and, fiually,in the various novel details of construction whereby its objects are attained.
In the accompanying drawings, forming part of this specification, like letters of reference indicate corresponding parts wherever they occur.
Figure l is a perspective view of the valvechest with the top and one side removed,showing the arrangement of the ports. Fig. 2 is a perspective view of the slide-valve, also showing the arrangement of the ports. Fig. 3 is a vertical sectional view of the valve, showing the openings for the bolts used in securing the valve-stem in position. view of the same, showing the grooves for supplying oil to the valve-seat. Fig. 5 is a top 'plan view of the bonnet or plate for holding the valve in place. Fig. 6 is a side elevation of one of the sides of the valve'chest. Fig. 7 is a side elevation of the valve-stem. Figs. 8, 9, 10, 11, and 12 are detail views of various parts of the apparatus, which will be described as they occur in the specification. Fig. 13 is a side elevation showing the apparatus put together. Fig. 14 is a sectional detail view of the end of the head of the valve-stem, and Fig. 15 is a vertical sectional view of the device with theparts assembled.
Fig. 4 is a top plan
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