US118340A - Improvement in cut-off valves for steam-engines - Google Patents

Improvement in cut-off valves for steam-engines Download PDF

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US118340A
US118340A US118340DA US118340A US 118340 A US118340 A US 118340A US 118340D A US118340D A US 118340DA US 118340 A US118340 A US 118340A
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steam
cut
cylinder
valve
engines
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/02—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables
    • B24B47/06—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables by liquid or gas pressure only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/046—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed depending on the position of the working member
    • F15B11/048—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed depending on the position of the working member with deceleration control

Definitions

  • My invention consists in a valve with a loose self-adjustable face, for the purpose of saving steam by cutting the steam oif from the cylinder at half-stroke, more or less, as desired, and holding it in the cylinder on the piston to the end of the stroke without cramping the exhaust.
  • Figure l is a sectional side elevation,showing the openings in an ordinary steam-cylinder with steam-chest, valve-seat, valve, and rod, 850.
  • Fig. 2 is a top view of the loose face P P, showing its construction.
  • the loose face P P and piece V are fitted and ground together, and provided with flanges l and l at the ends, for the purpose of allowing the valve to lengthen and shorten itself at each end alternately while in operation, and also to give to the loose face PP its proper movement.
  • the loose face P P is provided with two openings, B and B, for admitting the steam to the cylinder, and one opening, M, for exhausting it from the cylinder.
  • This loose face P P is intended to move about one-half, (15,) more or less, of the distance moved by the piece V, and is determined by the space between the flanges l and Z.
  • This loose face P P is intended only to admit the steam to the cylinder through the openings B and B, and to exhaust it from the cylinder after it has done its Work through the opening M into the exhaust-port E of the engine, while the piece V is intended to cut the steam off from passing into the cylinder only by moving over the openings B and B alternately, thus making the lead ing-on and cutting-off points independent of each other.
  • This valve,V and P P combined, can be made to cut the steam off from the cylinder at any desired point of the stroke and equally at both ends,
  • the piece V can be set to cut off, without regard to leading-on or exhausting, as the loose face P P performs both these operations itself when moved by the pieceV coming in contact with the flan ges l l, or their equivalent.
  • the position of the valve V P P is supposed to have been drawn by the valve-rod to the end of its movement, admitting the steam to the cylinder through opening Binto steam-channel 0.
  • the first movement from its present position would be for the valve-rod to force the piece V back, (the loose face P P standing still and holding open the exhaust with the steam-channel'ofl) pass over the opening B, and cut ofi the steam from passing into the cylinder through 0, uncovering opening B, and then coming in contact with.
  • flange I move the loose face P P until opening M leaves steam-channel 0, closing it, and opening communication between exhaust-port E and steam-channel 0, and admitting the steam to the other end of the cylinder by bringing opening B over steamchannel 0.
  • the effect of the return movement of the valve would, of course, be similar to that of the forward movement just described.
  • valve V P P with self-adjustable face,provided with flanges Z l, or their equivalent, for the purpose of allowing the valve to shorten and lengthen itself at each end alternately while in operation, substantially and for the purpose hereinbefore set forth.

Description

SAMUEL? MQCAYRTERS mPRovto CUT-OFFVALVL Pawnee Aug. 22,3371.
' INVEN'TOR,
WITNESSESfl PATENT QFFICE.
SAMUEL MCOARTER, OF NORB'ISTOWN, PENNSYLVANIA.
IMPROVEMENT IN CUT-OFF VALVES FOR STEAM-ENGINES.
Specification forming part of Letters Patent No. 118,340, dated August 22, 1871.
To all whom it may concern:
Be it known that I, SAMUEL MGGARTER, of N orristown, in the county of Montgomery and State of Pennsylvania, have invented a certain Improvement in Gut-01f Valves for Steam-Engines, of which the following is a specification:
My invention consists in a valve with a loose self-adjustable face, for the purpose of saving steam by cutting the steam oif from the cylinder at half-stroke, more or less, as desired, and holding it in the cylinder on the piston to the end of the stroke without cramping the exhaust.
Figure l is a sectional side elevation,showing the openings in an ordinary steam-cylinder with steam-chest, valve-seat, valve, and rod, 850. Fig. 2 is a top view of the loose face P P, showing its construction.
The loose face P P and piece V are fitted and ground together, and provided with flanges l and l at the ends, for the purpose of allowing the valve to lengthen and shorten itself at each end alternately while in operation, and also to give to the loose face PP its proper movement. The loose face P P is provided with two openings, B and B, for admitting the steam to the cylinder, and one opening, M, for exhausting it from the cylinder. This loose face P P is intended to move about one-half, (15,) more or less, of the distance moved by the piece V, and is determined by the space between the flanges l and Z. This loose face P P is intended only to admit the steam to the cylinder through the openings B and B, and to exhaust it from the cylinder after it has done its Work through the opening M into the exhaust-port E of the engine, while the piece V is intended to cut the steam off from passing into the cylinder only by moving over the openings B and B alternately, thus making the lead ing-on and cutting-off points independent of each other.
This valve,V and P P combined, can be made to cut the steam off from the cylinder at any desired point of the stroke and equally at both ends,
and hold it in the cylinder on the piston to the end of the stroke and then exhaust freely, keeping open a wide communication with the exhaustport E, thus allowing the piston to return without being retarded in the least, thereby getting the full benefit of the expansive force of the steam on the opposite side or end of the piston.
The piece V can be set to cut off, without regard to leading-on or exhausting, as the loose face P P performs both these operations itself when moved by the pieceV coming in contact with the flan ges l l, or their equivalent.
The position of the valve V P P, as shown in the drawing, is supposed to have been drawn by the valve-rod to the end of its movement, admitting the steam to the cylinder through opening Binto steam-channel 0. Now, the first movement from its present position would be for the valve-rod to force the piece V back, (the loose face P P standing still and holding open the exhaust with the steam-channel'ofl) pass over the opening B, and cut ofi the steam from passing into the cylinder through 0, uncovering opening B, and then coming in contact with. flange I, move the loose face P P until opening M leaves steam-channel 0, closing it, and opening communication between exhaust-port E and steam-channel 0, and admitting the steam to the other end of the cylinder by bringing opening B over steamchannel 0. The effect of the return movement of the valve would, of course, be similar to that of the forward movement just described.
I claim The combined valve V P P with self-adjustable face,provided with flanges Z l, or their equivalent, for the purpose of allowing the valve to shorten and lengthen itself at each end alternately while in operation, substantially and for the purpose hereinbefore set forth.
SAML. MGGARTER.
Witnesses:
R. S. NEwBoLD, J. D. NEW'BOLD.
US118340D Improvement in cut-off valves for steam-engines Expired - Lifetime US118340A (en)

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