US715707A - Safety-valve. - Google Patents

Safety-valve. Download PDF

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Publication number
US715707A
US715707A US1902101518A US715707A US 715707 A US715707 A US 715707A US 1902101518 A US1902101518 A US 1902101518A US 715707 A US715707 A US 715707A
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Prior art keywords
valve
stem
safety
ports
piston
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Harold P Tippett
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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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
    • F16K17/105—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve using choking or throttling means to control the fluid operation of the main valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7762—Fluid pressure type
    • Y10T137/7764—Choked or throttled pressure type
    • Y10T137/7765—Pilot valve within main valve head

Definitions

  • This invention relates to steam engine valves, and particularly to a safety-valve for locomotive and other boilers.
  • the invention embodies various improvements in safety-valves, and especially in the safety-valve covered by Letters Patent issued to me May 11, 1897, numbered 582,445, and in the valve covered by my application led March 18, 1902, ySerial No. 97,320.
  • the first or principal object of this invention is to provide in a safety-valve a construction and arrangement of parts to effect the closing or seating of -a vertically slidable main valve in the direction of the ow of steam from a boiler instead of against such steam Iiow, as covered by the above-mentioned patent.
  • Afurther purpose of the invention is to provide in a safety-valve a vertically-slidable main valve having a central opening around which is formed a valve-seat, the bottom of the main valve being solid or closed, except for said opening, and Without a port or ports, as shown in my patent hereinbcfore referred to.
  • the main valve has an open top and is cup-shaped, so that the bottom is of smaller area than the top; but in this application I provide the main valve with a sleeve having a piston of larger area than the said valve.
  • Figure l is a perspective view, partly broken away, of a valve constructed under this application.
  • Fig.'2 is a central vertical section without muftiers.
  • Fig. 3 is a cross-section on the plane indicated by the line Fig.2.
  • Fig. 4 is a perspective view of the main valve.
  • Fig. 5 is 'a central vertical section of a modification.
  • Fig. 6 is a section of modified form of main valve.
  • the valve-body consists of an outer casing 1, adapted to be attached to a locomotive or other steam boiler, and having valve-guides 2, and a valve-seat 3; an inner shell 4, having a central valve-sleeve, bearing 5, and joined to the casing bya series of ribs 6, which form with the casing and shell, a series of exhaustports 7.
  • the main valve comprises a hollow sleeve 8, working steam-tight in the bearing 5 and opening through an otherwise closed 0r solid bottom 9, which works between the guides 2 and has a valve-seat 10 formed upon its upper surface to coperate with the vseat 3 and a piston 11, secured to the top of the stem 8 and making a steam-tight bearing against the shell 4.
  • the shell 4 is provided with a cover 12, having a hollow depending stem 13, over which the sleeve is fitted steam-tight.
  • the stem 13 is provided with a valve-seat 14, and adjacent to the latter are ports 15 through the stem.
  • the cover I12 has one or more ports 1G anda head 17 to receive a nut 18, having inside and outside screw-threads.
  • a hood 19- is screwed to the top of the nut 18 and holds the outer muffler 20 and the inner conical muffler 21 to the nut and in position on the valve-casing.
  • the controlling-valve 22 has an open top and a closed bottom and is provided With a valve-seat 23 to engage the valve-seat 14. From the seat 23 to the top of the valve 22 the latter makes a steamtight joint with the cover l2 and the stem 13, and from the said seat 23 the controlling-valve 22 is reduced to the bottom thereof to leave a live-steam passage between the controlling-valve and the stem 13.
  • the means for regulating the spring 24 and adjusting'the valve 22 is disclosed in my application hereinbefore referred to, but not therein claimed specifically. It consists of a hollow bolt 25, held to the nut 18 by a nut 26, a rod 27, having a shoulder 28 to engage the spring, and a set-bolt 29 to Work the rod 27 in the hollow bolt 25.
  • the hood 19 covers this mechanism and protects it from accidental movement.
  • valve-casing is the same as that before described herein, except it is .without valve-guides and has an external thread 30 for attaching the muftlers 31 and 32 instead of attaching them as already de IOO scribed.
  • Thecover33 hasnodependingstem; but a central flange 34 is formed on the top of the cover, through which a stem 35 of the main-valve piston 36 works, so as to leave an exhaust-passage 37.
  • the said stem has ports 38 adjacent to a valve-seat 39 formed on the cap 36, and the stem 35 has an internal thread by which the nut 40 is attached and is free to be moved under the action of the main valve vertically through the mulilers.
  • a spring 41 may be employed to hold the main valve seated when there is no pressure on a boiler.
  • the main valve and all of its connections are slidable vertically through the shell and shell-cover, so that when the main valve lifts all of its parts are lifted with it, and the controllingvalve is also lifted within and by the main valve.
  • Fig. 6 shows a stem 42 integral with the top of the main valve and screwed into a iange 44 of the bottom 45 of said valve.
  • the operation of the preferred form of valve is as follows: Steam from the boiler inducts against the bottom of the main valve and holds it toits seat, while the same steampressure raises the controlling-valve and permits such steam to pass from around the controlling-valve through the stem-ports and eX- erts itself upon the top of the main piston, and the latter being of greater area than the bottom of the main valve the latter is forced open or downwardly unseated, which permits the exhaust to be made through the ports of the valve-casing.
  • the boiler-pressure is reduced sufficient to seat the controllingvalve, the steam above the main Valve discharges through the port or ports inthe casing-cover, and the main valve is again seated by the boiler-pressure.
  • the main valve having a sleeve making a steam-tight bearing on the body of the safety-valve and open at each end, a piston on the sleeve of greater area than the main valve, and means for admitting steam-pressure above the piston.
  • a safety-valve a projecting stern provided with a Valve seat and ports, a controlling-valve operated by steam in the stem to open and close the said ports, and a main valve having a piston of larger area than the valve.
  • a controlling-Valve slidable in the stem to open and close the said ports and a main valve having a sleeve slidable on the stem and connecting the piston and Valve of the main Valve.
  • a valve-cover having steam-exits, a stem depending from the cover and provided with a valve-seat, and ports, a controlling-valve slidable in the stem to open and ⁇ close the ports, a main valve having a piston of greater area than the valve, and a sleeve connecting the piston to the valve, and slidable on said stem.
  • a safety-valve a stem having ports projecting from the cover thereof, a safetyvalve proper having a sleeve open at each end and Working on the stem, a piston on the sleeve of larger area than the valve, and means for admitting steam-pressure above the piston.
  • a safety-valve a stem having ports and projecting through and from the cover thereof, a safety-valve proper having a sleeve open at each end, and a piston on the sleeve of larger area than the valve, combined with a controlling-valve Working in the stem.
  • a safety-valve the combination of the casing having a valve-seat, a piston, valveguides depending from the seat, a shell supported in the casing so as to form ports between the casingand the shell, and means for admitting steam-pressure above the piston.
  • a safety-valve the combination, with the casing having a valve-seat, the shell having a central bearing, and the casing-cover having a depending stem provided with a seat and ports, of a spring-controlled valve slidable in the stem so as to leave a steam-passage around the valve to said ports, and a main valve working in said bearing and having a removable piston of larger area than the main valve, and a sleeve forming the only opening in the main valve and connecting the piston therewith.

Description

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(Application filed Apr. 5, 1902.)
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UNITED STATES PATENT OFFICE.
HAROLD P. TIPPETT, OF COLUMBUS, OHIO. I
SAFETY-VALVE.
SPECIFICATION forming part of Letters Patent No. 715,707, dated December 9, 1902.
Application tiled April 5, 1902. Serial No. 101,518. (No model.)
To all whom it may concern.:
Be it known that I, HAROLD P. TIPPETT, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Safety-Valves, of which the following is a specication.
This invention relates to steam engine valves, and particularly to a safety-valve for locomotive and other boilers.
The invention embodies various improvements in safety-valves, and especially in the safety-valve covered by Letters Patent issued to me May 11, 1897, numbered 582,445, and in the valve covered by my application led March 18, 1902, ySerial No. 97,320.
The first or principal object of this invention is to provide in a safety-valve a construction and arrangement of parts to effect the closing or seating of -a vertically slidable main valve in the direction of the ow of steam from a boiler instead of against such steam Iiow, as covered by the above-mentioned patent.
Afurther purpose of the invention is to provide in a safety-valve a vertically-slidable main valve having a central opening around which is formed a valve-seat, the bottom of the main valve being solid or closed, except for said opening, and Without a port or ports, as shown in my patent hereinbcfore referred to. In said patent the main valve has an open top and is cup-shaped, so that the bottom is of smaller area than the top; but in this application I provide the main valve with a sleeve having a piston of larger area than the said valve.
In the accompanying drawings,` forming part of this application, Figure l is a perspective view, partly broken away, of a valve constructed under this application. Fig.'2 is a central vertical section without muftiers. Fig. 3 is a cross-section on the plane indicated by the line Fig.2. Fig. 4is a perspective view of the main valve. Fig. 5 is 'a central vertical section of a modification. Fig. 6 is a section of modified form of main valve.
The same numeral references denote the same parts throughout the several views of the drawings.
The valve-body consists of an outer casing 1, adapted to be attached to a locomotive or other steam boiler, and having valve-guides 2, and a valve-seat 3; an inner shell 4, having a central valve-sleeve, bearing 5, and joined to the casing bya series of ribs 6, which form with the casing and shell, a series of exhaustports 7.
The main valve comprises a hollow sleeve 8, working steam-tight in the bearing 5 and opening through an otherwise closed 0r solid bottom 9, which works between the guides 2 and has a valve-seat 10 formed upon its upper surface to coperate with the vseat 3 and a piston 11, secured to the top of the stem 8 and making a steam-tight bearing against the shell 4. The shell 4 is provided with a cover 12, having a hollow depending stem 13, over which the sleeve is fitted steam-tight. The stem 13 is provided with a valve-seat 14, and adjacent to the latter are ports 15 through the stem. The cover I12 has one or more ports 1G anda head 17 to receive a nut 18, having inside and outside screw-threads. A hood 19-is screwed to the top of the nut 18 and holds the outer muffler 20 and the inner conical muffler 21 to the nut and in position on the valve-casing.
The controlling-valve 22 has an open top and a closed bottom and is provided With a valve-seat 23 to engage the valve-seat 14. From the seat 23 to the top of the valve 22 the latter makes a steamtight joint with the cover l2 and the stem 13, and from the said seat 23 the controlling-valve 22 is reduced to the bottom thereof to leave a live-steam passage between the controlling-valve and the stem 13.
The means for regulating the spring 24 and adjusting'the valve 22 is disclosed in my application hereinbefore referred to, but not therein claimed specifically. It consists of a hollow bolt 25, held to the nut 18 by a nut 26, a rod 27, having a shoulder 28 to engage the spring, and a set-bolt 29 to Work the rod 27 in the hollow bolt 25. The hood 19 covers this mechanism and protects it from accidental movement.
Referring to the modification shown in Fig. 5 of the drawings, the valve-casingis the same as that before described herein, except it is .without valve-guides and has an external thread 30 for attaching the muftlers 31 and 32 instead of attaching them as already de IOO scribed. Thecover33 hasnodependingstem; but a central flange 34 is formed on the top of the cover, through which a stem 35 of the main-valve piston 36 works, so as to leave an exhaust-passage 37. The said stem has ports 38 adjacent to a valve-seat 39 formed on the cap 36, and the stem 35 has an internal thread by which the nut 40 is attached and is free to be moved under the action of the main valve vertically through the mulilers. A spring 41 may be employed to hold the main valve seated when there is no pressure on a boiler. In the construction shown in Fig. 5 the main valve and all of its connections are slidable vertically through the shell and shell-cover, so that when the main valve lifts all of its parts are lifted with it, and the controllingvalve is also lifted within and by the main valve.
Fig. 6 shows a stem 42 integral with the top of the main valve and screwed into a iange 44 of the bottom 45 of said valve.
The operation of the preferred form of valve is as follows: Steam from the boiler inducts against the bottom of the main valve and holds it toits seat, while the same steampressure raises the controlling-valve and permits such steam to pass from around the controlling-valve through the stem-ports and eX- erts itself upon the top of the main piston, and the latter being of greater area than the bottom of the main valve the latter is forced open or downwardly unseated, which permits the exhaust to be made through the ports of the valve-casing. When the boiler-pressure is reduced sufficient to seat the controllingvalve, the steam above the main Valve discharges through the port or ports inthe casing-cover, and the main valve is again seated by the boiler-pressure.
Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is
l. In a safety-valve, the main valve having a sleeve making a steam-tight bearing on the body of the safety-valve and open at each end, a piston on the sleeve of greater area than the main valve, and means for admitting steam-pressure above the piston.
2. In a safety-valve, a projecting stern provided with a Valve seat and ports, a controlling-valve operated by steam in the stem to open and close the said ports, and a main valve having a piston of larger area than the valve.
3. In a safety-valve, a stern depending from the valve-cover and having a seat and ports,
a controlling-Valve slidable in the stem to open and close the said ports, and a main valve having a sleeve slidable on the stem and connecting the piston and Valve of the main Valve.
4. In a safety-valve, a valve-cover having steam-exits, a stem depending from the cover and provided with a valve-seat, and ports, a controlling-valve slidable in the stem to open and `close the ports, a main valve having a piston of greater area than the valve, and a sleeve connecting the piston to the valve, and slidable on said stem.
5. In a safety-valve, a stem having ports projecting from the cover thereof, a safetyvalve proper having a sleeve open at each end and Working on the stem, a piston on the sleeve of larger area than the valve, and means for admitting steam-pressure above the piston.
6. In a safety-valve, a stem having ports and projecting through and from the cover thereof, a safety-valve proper having a sleeve open at each end, and a piston on the sleeve of larger area than the valve, combined with a controlling-valve Working in the stem.
7. In a safety-valve, the combination of the casing having a valve-seat, a piston, valveguides depending from the seat, a shell supported in the casing so as to form ports between the casingand the shell, and means for admitting steam-pressure above the piston.
8. In a safety-valve, the combination, with the casing having a valve-seat, the shell having a central bearing, and the casing-cover having a depending stem provided with a seat and ports, of a spring-controlled valve slidable in the stem so as to leave a steam-passage around the valve to said ports, and a main valve working in said bearing and having a removable piston of larger area than the main valve, and a sleeve forming the only opening in the main valve and connecting the piston therewith.
9. The combination, with the shell and casing, of a main valve having a piston of larger area than the valve, a stem provided with ports and a valve-seat and projecting from the piston slidably through the top of the shell, and a controlling-valve operated in the stem to open and close said ports.
In witness whereof I hereunto set my hand in the presence of two witnesses.
' HAROLD P. TIPPETT.
l/Vitnesses: l
CHARLES S. M. TRUMAN, NORMAN L. I-IAYDEN.
US1902101518 1902-04-05 1902-04-05 Safety-valve. Expired - Lifetime US715707A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2520893A (en) * 1944-03-16 1950-08-29 Merit Engineering Inc Relief valve
US2680453A (en) * 1950-04-13 1954-06-08 Borg Warner Safety relief valve
US2774373A (en) * 1954-01-30 1956-12-18 Tech Et Commerciale D Installa Safety valve, notably for hydrocarbon reservoirs and pipings

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2520893A (en) * 1944-03-16 1950-08-29 Merit Engineering Inc Relief valve
US2680453A (en) * 1950-04-13 1954-06-08 Borg Warner Safety relief valve
US2774373A (en) * 1954-01-30 1956-12-18 Tech Et Commerciale D Installa Safety valve, notably for hydrocarbon reservoirs and pipings

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