US3557826A - Safety valve for protecting hydraulic mine props against overloads - Google Patents

Safety valve for protecting hydraulic mine props against overloads Download PDF

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Publication number
US3557826A
US3557826A US755350A US3557826DA US3557826A US 3557826 A US3557826 A US 3557826A US 755350 A US755350 A US 755350A US 3557826D A US3557826D A US 3557826DA US 3557826 A US3557826 A US 3557826A
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US
United States
Prior art keywords
piston
hollow piston
block
guide
safety valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US755350A
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English (en)
Inventor
Heinz Albrecht
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Individual
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Individual
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Publication date
Priority claimed from DE19671583109 external-priority patent/DE1583109A1/de
Application filed by Individual filed Critical Individual
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Publication of US3557826A publication Critical patent/US3557826A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/025—Check valves with guided rigid valve members the valve being loaded by a spring
    • F16K15/026—Check valves with guided rigid valve members the valve being loaded by a spring the valve member being a movable body around which the medium flows when the valve is open
    • 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
    • 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
    • F16K17/20—Excess-flow valves
    • 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
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7866—Plural seating
    • Y10T137/7867—Sequential
    • Y10T137/7868—Resilient gasket
    • 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
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7905—Plural biasing means
    • 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
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7922—Spring biased
    • Y10T137/7929—Spring coaxial with valve
    • Y10T137/7937—Cage-type guide for stemless valves

Definitions

  • a safety valve which is adapted to protect hydraulic mine props against overloads. This valve has an elastomeric block which is supported at one end by a gas pressure cushion and the other end engages a seat and is adapted to regulate slots on the seat through which the liquid pressure medium can flow out of the pressure chamber of the prop.
  • rock burst safety valves are known, but are con sidered superfluous by some experts (see Spruth Strebeausbau in Stahl andchtmetall", Verlag Glueckauf G.m.b.I-I., Essen, 1963, p. 102 and following), because, according to the opinion of these experts permanent deformations of the prop can be explained as being caused by it having been given the wrong dimensions. This has, on the other hand, not prevented the development of rock burst valves for mine props.
  • a rock burst valve for example, which consists of two conventional pressure relief valves of varying cross section in which construction the valve with the larger cross section is intended for the high pressure occurring in the liquid pressure medium due to rock bursts (German published specification No. 1,078,516).
  • it is known to arrange the large cross section required for compensating the high pressures occurring in the liquid pressure medium during rock bursts, by opening the exhaust valve of the prop by making provision for additional piston ring surface on this valve body German published specification No. 1,195,251
  • the invention overcomes these problems in that the block is movably guided in an axial direction inside a hollow piston which on its annular surface and supported on the seat is provided with grooves and in that the ability of the block to move axially within the hollow piston is sufficient in order to permit the surface facing the annularly constructed seat to be withdrawn behind the grooves in the hollow piston.
  • This safety valve acts under normal loads like a conventional gas pressure valve, that is to say by means of elastic deformation of the block in order to release the capillary currents of liquid pressure medium.
  • a large load exceeding the carrying capacity of the prop is applied with great velocity, the block as a whole is lifted off the seat of the valve and opens the path for a correspondingly strong current of liquid from the pressure chamber outwardly of the prop.
  • Such a strong flow of liquid pressure medium flowing at considerable speed would under normal circumstances on account of its eroding ability destroy the elastic block.
  • the invention prevents this because the elastic block is able to withdraw behind the grooves.
  • the invention therefore achieves the result of a complete safeguarding of the prop against load with the aid of a novel safety valve while at the same time avoiding excessive loads on vital parts of this valve.
  • the arrangement can be made in such a manner that the hollow piston receives a guide piston which braces the block and together with the guide piston encloses the chamber which contains the gas pressure cushion.
  • This arrangement makes it possible to add to the two previously mentioned opening stages of the valve, a third one.
  • this third opening stage not only is the elastic block complete ly lifted from the seat, but in addition the annular surface of the guide piston provided with slots is lifted off its seat.
  • Such supporting spring becomes necessary when the effective surface of the guide piston which is subjected to the gas pressure happens to be comparatively small. Under such circumstances it is advisable to let the supporting spring act upon the guide piston and to provide on the guide piston and hollow piston supporting surfaces with the aid of which the guide piston can deflect the hollow piston after having lifted it from its seat, against the spring.
  • FIGURE is a longitudinal sectional view of the safety valve showing the characteristics of the invention.
  • the safety valve has a housing 1 which has a portion 2 of reduced dimensions.
  • the housing can be fitted with the part 2 extending into a drill hole provided in a hydraulic mine prop where it is locked in position. Then there is provided a sealed connection to the pressure chamber of the prop, and among other elements for this purpose, an O-shaped ring 3 may be provided on the outer surface of the housing portion 2.
  • the housing 1 is closed at one end by a screw-threaded closure cap 4 which is sealed to the housing 1 by a sealing ring 5.
  • an axially movable hollow piston 6 in which a guide piston 7 is axially movable.
  • the hollow piston 6 is equipped at its end with a block 10 of elastomeric material, for example of plastic or some other material having a suitable coefficient of elasticity.
  • the block I0 bears at one end against an annular seat 11.
  • a washer 9 is interposed between the end of the block 10 and the guide piston 7 and an O-ring I2 provides a seal between the block 10 and the inner walls of the hollow piston 6.
  • the block 10 is screwed onto the guide piston 7 by means of a thread 13.
  • the block 10, washer 9 and the O-ring 12 are introduced from the left-hand side into the hollow piston 6.
  • the guide piston 7 has an O-ring 8 which seals against the walls of the hollow piston 6 and this assembly can be inserted into the hollow piston.
  • chamber 14 disposed between the closure cap 4 and the two pistons 6 and 7 constituting a gas pressure cushion containing a gas under high pressure.
  • the gas is introduced to the chamber 14 through the drill hole 15 which is sealed by a disc 16 provided with an O-ring 17 and having a guide extension projecting into the hole.
  • a coil spring 18 exerts pressure against the guide piston 7 and in turn urges the block 10 through the washer l6 against the annular seat ll. lf desired a spring (not shown) may be arranged between the cap 4 and the hollow piston 6 for urging it against the seal 11. Normally the elastomeric block l and the hollow piston 6 are urged against the seat 11 by the high pressure gas in the chamber 14.
  • the numeral 19 designates shoulders arranged on the guide piston 7 and on the hollow piston 6.
  • This axial movement of the block 10 within the hollow piston 6 is sufficient to withdraw its surface 23 which faces the annularly shaped seat ll behind several radial slots 21 in the ring-shaped surface of the hollow piston 6 which faces the annular seat and in this manner to withdraw the block 10 from the direct action of the flowing pressure medium.
  • a seal 24 seals the chamber 14 against a discharge port 22 in the housing 1 through which the liquid pressure medium can escape after passing through the slots 21.
  • the hollow piston can at this time move axially.
  • the technical advance which is achieved with the above described safety valve consists mainly in that the valve, while maintaining the particular advantages inherent in the gas pressure valves, protects the prop even during extraordinary loads which are encountered with rock burst.
  • a safety valve for protecting hydraulic mine props against overloads comprising a housin provided with an inlet opening at one end adapted to receive ydraulic pressure from a mine prop, a hollow piston having axial movement within said housing, means closing the opposite end of said housing, a chamber between said housing closing means and the end of said piston containing gas under pressure to provide a gas pressure cushion yieldably resisting retracting movement of said piston, an annular valve seat about said opening, an elastomeric block mounted for axial movement on the end of said piston and having an annular surface seating against said valve seat, a discharge opening in the sidewall of said housing spaced from said chamber, a seal between said piston and the walls of said housing to prevent the escape of gas from said chamber to said discharge opening, and slots in said piston extending from said valve seat to the region of said discharge opening to provide fluid communication between said inlet opening and said discharge opening, said gas pressure cushion resisting movement of said block away from said valve seat, said block being mounted for covering said slots and arresting flow therethrough in a valve closed
  • a safety valve as claimed in claim 2 comprising a shoulder on said hollow piston, and a washer abutting the inner end of said elastomeric block and adapted to engage said shoulder upon axial movement of said block relative to said hollow piston, thereby to limit the movement of the block and guide piston assembly relative to said hollow piston and to cause said hollow piston to be shifted thereafter by the guide piston assembly.
  • a safety valve as claimed in claim 3, comprising facing abutment surfaces on said hollow piston and guide piston for limiting the axial movement of the hollow piston with respect to said guide piston and to enable the guide piston thereafter to be shifted by the hollow piston.
  • a safety valve as claimed in claim 4 in which the area ex posed to the pressure of the gas cushion is greater with respect to said guide piston, than said hollow piston, whereby said elastomeric block may be deformed to uncover said slots without moving axially but axial movement may at that time be imparted to said hollow piston for enabling hydraulic pressure release.
  • a safety valve as claimed in claim 2 comprising a coil spring interposed between said housing closing means and said guide piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)
  • Lift Valve (AREA)
  • Check Valves (AREA)
  • Fluid-Damping Devices (AREA)
  • Lining And Supports For Tunnels (AREA)
US755350A 1967-09-06 1968-08-26 Safety valve for protecting hydraulic mine props against overloads Expired - Lifetime US3557826A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671583109 DE1583109A1 (de) 1967-09-06 1967-09-06 Sicherheitsventil zum UEberlastungsschutz von hydraulischen Grubenstempeln

Publications (1)

Publication Number Publication Date
US3557826A true US3557826A (en) 1971-01-26

Family

ID=5679422

Family Applications (1)

Application Number Title Priority Date Filing Date
US755350A Expired - Lifetime US3557826A (en) 1967-09-06 1968-08-26 Safety valve for protecting hydraulic mine props against overloads

Country Status (3)

Country Link
US (1) US3557826A (enrdf_load_stackoverflow)
JP (1) JPS5018210B1 (enrdf_load_stackoverflow)
GB (1) GB1231626A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716070A (en) * 1970-03-14 1973-02-13 Gewerk Eisenhuette Westfalia Non-return valve devices
DE2535385A1 (de) * 1975-08-08 1977-02-24 Banyaszati Kutato Intezet Gasfeder-gegenstrom-druckbegrenzungsventil, insbesondere fuer hydraulische grubenstempel
US4091838A (en) * 1975-09-09 1978-05-30 Dowty Mining Equipment Limited Pressure relief valve
US4252476A (en) * 1978-09-12 1981-02-24 Bochumer Eisenhutte Heintzmann Gmbh & Co. Hydraulically operated mine prop with safety valve
FR2504974A1 (fr) * 1981-04-30 1982-11-05 Bennes Marrel Valve hydraulique de coulissement pour verin de mine
US4450859A (en) * 1981-10-05 1984-05-29 Mechanical Technology Inc. Safety valve
US5323686A (en) * 1988-09-01 1994-06-28 Halliburton Company Tube jetting apparatus
US5694969A (en) * 1996-01-22 1997-12-09 Devuyst; Christopher Pressure relief tire valve
CN104153795A (zh) * 2014-08-06 2014-11-19 巨隆集团芜湖兴隆液压有限公司 一种安全阀
CN108019541A (zh) * 2016-10-31 2018-05-11 株式会社捷太格特 阀装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1623431A (en) * 1920-07-03 1927-04-05 Vincen P Mcvoy Combined cylinder cock and relief valve
US2556867A (en) * 1946-03-29 1951-06-12 Carlisle Willis Calvert Flow valve
US2595012A (en) * 1947-04-03 1952-04-29 Maytag Co Spring biased valve seat seal
US2912001A (en) * 1955-04-04 1959-11-10 Donald C Green Check valves

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1623431A (en) * 1920-07-03 1927-04-05 Vincen P Mcvoy Combined cylinder cock and relief valve
US2556867A (en) * 1946-03-29 1951-06-12 Carlisle Willis Calvert Flow valve
US2595012A (en) * 1947-04-03 1952-04-29 Maytag Co Spring biased valve seat seal
US2912001A (en) * 1955-04-04 1959-11-10 Donald C Green Check valves

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716070A (en) * 1970-03-14 1973-02-13 Gewerk Eisenhuette Westfalia Non-return valve devices
DE2535385A1 (de) * 1975-08-08 1977-02-24 Banyaszati Kutato Intezet Gasfeder-gegenstrom-druckbegrenzungsventil, insbesondere fuer hydraulische grubenstempel
US4091838A (en) * 1975-09-09 1978-05-30 Dowty Mining Equipment Limited Pressure relief valve
US4252476A (en) * 1978-09-12 1981-02-24 Bochumer Eisenhutte Heintzmann Gmbh & Co. Hydraulically operated mine prop with safety valve
FR2504974A1 (fr) * 1981-04-30 1982-11-05 Bennes Marrel Valve hydraulique de coulissement pour verin de mine
US4450859A (en) * 1981-10-05 1984-05-29 Mechanical Technology Inc. Safety valve
US5323686A (en) * 1988-09-01 1994-06-28 Halliburton Company Tube jetting apparatus
US5694969A (en) * 1996-01-22 1997-12-09 Devuyst; Christopher Pressure relief tire valve
CN104153795A (zh) * 2014-08-06 2014-11-19 巨隆集团芜湖兴隆液压有限公司 一种安全阀
CN108019541A (zh) * 2016-10-31 2018-05-11 株式会社捷太格特 阀装置

Also Published As

Publication number Publication date
GB1231626A (enrdf_load_stackoverflow) 1971-05-12
JPS5018210B1 (enrdf_load_stackoverflow) 1975-06-27

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