WO2002050458A1 - Soupape etanche avec force d'obturation a auto-regulation - Google Patents

Soupape etanche avec force d'obturation a auto-regulation Download PDF

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Publication number
WO2002050458A1
WO2002050458A1 PCT/RO2001/000003 RO0100003W WO0250458A1 WO 2002050458 A1 WO2002050458 A1 WO 2002050458A1 RO 0100003 W RO0100003 W RO 0100003W WO 0250458 A1 WO0250458 A1 WO 0250458A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
stopcock
fiie
shutting
fluid
Prior art date
Application number
PCT/RO2001/000003
Other languages
English (en)
Inventor
Matei Cojocaru
Original Assignee
Matei Cojocaru
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matei Cojocaru filed Critical Matei Cojocaru
Priority to AU2001241303A priority Critical patent/AU2001241303A1/en
Publication of WO2002050458A1 publication Critical patent/WO2002050458A1/fr

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Classifications

    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/12—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with streamlined valve member around which the fluid flows when the valve is opened
    • F16K1/123—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with streamlined valve member around which the fluid flows when the valve is opened with stationary valve member and moving sleeve

Definitions

  • the present invention is about aleak-proof valve with self-controlling shutting force, designed for use in installations for fluid transport and distribution- It is known a valve whose shutting element is a metallic membrane (patent France - no. 2677424). A piston acts on the surface of the metallic membrane, displacing it towards the seat of the inlet pipe duct and accomplishing the closing.
  • the valve is highly leak-proof with respect both to environment and to the driving mechanism, and it is used especially in installations for highly pure and very noxious fluids. It presents die following drawbacks: — the membrane is subjected to high elastic deformation, by means of both the piston action and the pressure of the fluid; — for large cross-sections of the valve and high pressures of the fluid, the force acting on the membrane is very high; — the limited possibilities of membrane elastic deformation cause the increasing of the valve overall dimensions; — file shutting force bringing the membrane into contact with the seat isn't controlled, therefore the possible overloads and its deformation on the sealing surface may cause its exfoliation.
  • the technical problem solved by the present invention is the construction of a highly reliable, easy to handle leak-proof valve having a large field of application in installations for fluid transport and distribution.
  • the valve comprises a valve casing with a shutting force control mechanism acting on it.
  • This mechanism is handled by a driving mechanism and wrapped in a protective casing.
  • valve is highly leak-proof with respect both to its component mechanisms and to environment; — file shutting force is self-controlling and is maintained to a value established by design; — it reduces the force necày to drive the valve to a value close to the one of the force that seals the shutting element; — quick and convenient handling;
  • — fig. 2 — comptural scheme of the shutting force control mechanism shown with the stopcock in its closed position
  • — fig.3 structural scheme of the shutting force control mechanism shown with the stopcock in its opened position
  • — fig.4 structural scheme of the shutting force control mechanism shown with the stopcock in its closed position and having the upstream levers inclined with an initial angle
  • — fig. 5 structural scheme of the shutting force control mechanism shown with the stopcock in its opened position and having the upstream levers inclined with an initial angle
  • . fig.6 mounting drawing of the metallic elastic membranes for high-temperature fluids
  • the valve comprises a valve casing A with a shutting force control mechanism B acting on it.
  • This mechanism is handled by a driving mechanism C and wrapped in a protective casing D — fig. 1.
  • the valve casing A is ent to ensure the connection between the valve and the pipe duct, to conduct the fluid through the valve section and to physically support the other component elements of the valve.
  • the valve body 1 is connected to the pipe duct by means of two flanges 2 fastened to the valve body by two threaded joints.
  • the sealing rings 3, pressed down by the special nuts 4, ensure the leak-tightness with respect to the valve body.
  • the valve bod is fitted with a shutter wall a and communication passages b, through which the fluid flows.
  • Two guidance cones S used for fluid-flow conduction, are installed within the valve body and on the outside the body is fitted with a stopcock seat c that has a sealing gasket 6 mounted on it.
  • the fluid passes through the comunication passages and enters a shutting force control mechanism B whose body 7 is fitted with a stopcock disk d.
  • a cap 8 fastened by a retaining snap ring 9 and a retaining nut 10, is mounted at the upstream extremity of the shutting force control mechanism.
  • the inner surface of the cap has longitudinal grooves e, in order to prevent the rotation movement of the protective casing.
  • a cap 11 is mounted at fiie downstream extremity of the shutting force control mechanism.
  • the caps are used to guide and position the mechanism in its translation movement.
  • the mechanism has a system that takes over and distributes the axial forces exerted by the pressure of the fluid.
  • the pressure of fiie fluid acts upon an elastic membrane 14 that ensures efficient leak-tightness with respect both to environment and to the other component parts of the mechanism.
  • the elastic membrane is fastened to the mechanism body on a sealing surface f by a securing ring 15 fitted with a limiting spur g used to limit the force that compresses the membrane.
  • the securing ring is pressed down by a half-bearing 16 fitted with a woridng surface h shaped like a toroidal sector pressed down, in its turn, by another half-bearing 17 fitted with a working surface i also shaped like a toroidal sector and fastened by a retaining nut 18.
  • the elastic membrane is supported by coaxial pressure rings: 19, 20, 21, 22 fitted with driving spurs: j, k, 1, m and a limiting spur n. These spurs are used to induce the translation movement of the rings, within established limits, when there is no pressure inside the mechanism.
  • the pressure rings take over the forces exerted by fiie elastic membrane and transmit them to the levers 23 fitted with a working surface o shaped like a sector of a barrel.
  • the sectors of the barrel and the bearing shaped like a toroidal sector form toghether the hinges of the levers.
  • the membrane is fastened to the valve body on a sealing surface p by a securing ring 24 fitted with a limiting spur r pressed down, in its turn, by a supporting ring 25.
  • This supporting ring is fitted with a surface s supporting the levers and a retaining nut 26 fastens it.
  • the lever axis is perpendicular to the valve axis, making together a plane disk.
  • the levers are fitted with woridng surfaces whose sections are shaped like special curves. This particular shape ensures the tangential contact between these working surfaces and several established points on fi e rings, even when file levers become inclined with respect to the valve axis.
  • a spring 27 mounted at the downstream extremity of the shutting force control mechanism maintains the stopcock closed.
  • the valve opening is made by a driving mechanism C.
  • the frame 28 of this mechanism is fastened to the valve body by a retaining snap ring 29, a guide bush 30 and a retaining nut 31.
  • a key 32 prevents fi e rotation movement of both the guide bush and file driving mechanism frame.
  • a bush 33 driven by a driving nut 34, acts like a piston, sliding along a grooved surface t machined on the driving mechanism frame. The translation movement of the bush causes an axial translation movement of the shutting force control mechanism.
  • the driving nut is fastened to the driving mechanism frame by a shding fit u and it may be engaged in a rotation movement by means of several folding handles 35.
  • An adjusting washer 36 fitted with outer grooves v and fastened by a retaining nut 37, controls the axial clearance of the nut
  • the shutting force control mechanism is wrapped in a protective casing D that prevents both the acces of impurities and the damage of the working surfaces.
  • the protective casing body 38 is fastened to the driving nut by a shding fit w.
  • the protective casing body is fitted with a protective cap 39 mounted by a threaded joint.
  • the cap is fastened to the valve body by a retaining snap ring 40, a grooved bush 41 that guides the shutting force control mechanism and a retaining nut 42.
  • a key 43 prevents fiie rotation movement of the grooved bush.
  • the valve is shown with the stopcock in its closed position.
  • the elastic membranes are subjected to stresses that are considerably diminished by the system that takes over and distributes the axial forces exerted by the pressure of the fluid.
  • This system also mainta nes a constant value and fiie same direction of the forces transmitted from the pressure rings to the levers, and finally it controls the points where these forces are applied.
  • the shape of the elastic membranes and the materials they are made of are established according to fiie actual woridng conditions of the valves.
  • the pressure rings are considered to work as a single ring whose frontal area A is equal to the sum of the pressure rings frontal areas and to transmit a single concentrated load F, taken over by a single lever — fig. 2.
  • F ' d + F ' c F ' d + F ' c , with : F A , F - the axial forces acting on the hinges ; F R , F ' R > - fiie axial forces acting on the supports; F d , F 'd - the axial forces acting on the stopcock disk ; F c , F ' c - the axial forces acting on the stopcock seat.
  • sin ⁇ -— - F - co ⁇ + ⁇ l ⁇ . - F -sin 2 ⁇ ;
  • the above mentioned methods may be combined with a change of the flowing direction of the fluid, in accordance to the actual expected results.
  • three cases are analysed: one of them is for a valve with self-regulating sealing force and the other two are for a valve that starts working as a safety valve when fiie pressure surpasses the critical value.
  • the value of the angle ⁇ may be limited, either by changing fi e connection between the driving mechanism C and fiie shutting force control mechanism B or by using other methods.
  • safety valves may function either as regular valves that start working as safety valves only determined by an accidental increase of pressure, or as safety relief valves mounted at the delivery points.
  • Metallic elastic membranes 14 whose shapes ensure a good resistance and elasticity, are used for fluids with high temperatures and pressures — fig.6.
  • the valve is mounted in vertical position and the metallic elastic membranes 14, the stopcock seat c and the stopcock disk d have suitable shapes, allowing the /Ml J* ni ⁇ nr of fluid when the installation is emptied — fig. 7.
  • additional advantage namely the surfaces of the inlet and outlet pipes may achieve a M gh finish by means of a convenient machining procedure.
  • fiie securing ring 15 that fastens the elastic membrane 14 to the mechanism body 7 and the securing ring 24 that fastens the elastic membrane to fiie valve body I have their shapes modified and are rigid supports that take over fiie forces transmitted by the membrane — fig.8.
  • the above simplified mechanism presents the following advantages: considerably simplified construction practice, reduced dimensions and lower costs.
  • drawbacks namely the high stresses the elastic membranes are subjected to and the disturbed operation of the controlling forces.
  • a valve with a simplified shutting force control mechanism may also be used for fluids having good lubricating properties.
  • valve body 1 is fitted with a slot x where a sealing gasket 44 is installed, and the mechanism body 7 is fitted with a cylindrical sealing surface y — fig.9.
  • This mechanism presents the following advantages: good dimensioning and distribution of the controlling forces, simplified construction practice, reduced dimensions and lower costs.
  • the drawback of this mechanism is the possible damage of sealing, due to wear.
  • the valve features have been experimented on a model fitted with a simplified shutting force control mechanism, according to fig. 8, and they fully correspond to the stipulations.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Lift Valve (AREA)

Abstract

Cette invention porte sur une soupape étanche ayant une force d'obturation à auto-régulation et conçue pour être utilisée dans des installations de transport et de distribution de fluide. Cette soupape est constituée d'un corps cylindrique (1) équipé d'une paroi d'obturation (a), de passages de communication (b) et d'un siège de robinet (c) commandé par un mécanisme de contrôle (B) de la force d'obturation, ce dernier étant actionné par un mécanisme de commande (C). Le mécanisme de contrôle de la force d'obturation est pourvu d'un disque (d) de robinet et de deux systèmes qui réceptionnent et répartissent les forces axiales exercées par la pression du fluide et agissent en continu sur la force d'obturation du robinet, la maintenant à une valeur établie selon la conception. Ce paramètre caractéristique permet de réaliser une soupape dont la force d'étanchéité peut avoir une valeur constante, peut être autorégulatrice ou faire fonctionner la soupape comme soupape de sécurité lorsque la pression dépasse la valeur critique.
PCT/RO2001/000003 2000-12-21 2001-02-14 Soupape etanche avec force d'obturation a auto-regulation WO2002050458A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001241303A AU2001241303A1 (en) 2000-12-21 2001-02-14 Leak-proof valve with self-controlling shutting force

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ROA200001263 2000-12-21
ROA200001263A RO119480B1 (ro) 2000-12-21 2000-12-21 Robinet etanş cu forţa de închidere autocontrolată

Publications (1)

Publication Number Publication Date
WO2002050458A1 true WO2002050458A1 (fr) 2002-06-27

Family

ID=20129411

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RO2001/000003 WO2002050458A1 (fr) 2000-12-21 2001-02-14 Soupape etanche avec force d'obturation a auto-regulation

Country Status (3)

Country Link
AU (1) AU2001241303A1 (fr)
RO (1) RO119480B1 (fr)
WO (1) WO2002050458A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB551475A (en) * 1941-08-21 1943-02-24 Joseph Malkin White Glandless streamline valve
US3253608A (en) * 1961-04-27 1966-05-31 Davis Albert Henry Control of liquid distribution
FR1600112A (fr) * 1968-12-30 1970-07-20
FR2677424A1 (fr) 1991-06-07 1992-12-11 Transfluid Sa Embase pour vanne dont l'obturateur est constitue par une membrane metallique.
US5261442A (en) * 1992-11-04 1993-11-16 Bunnell Plastics, Inc. Diaphragm valve with leak detection
DE4445589A1 (de) * 1994-12-20 1996-06-27 Danfoss As Membrangesteuertes Ventil

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB551475A (en) * 1941-08-21 1943-02-24 Joseph Malkin White Glandless streamline valve
US3253608A (en) * 1961-04-27 1966-05-31 Davis Albert Henry Control of liquid distribution
FR1600112A (fr) * 1968-12-30 1970-07-20
FR2677424A1 (fr) 1991-06-07 1992-12-11 Transfluid Sa Embase pour vanne dont l'obturateur est constitue par une membrane metallique.
US5261442A (en) * 1992-11-04 1993-11-16 Bunnell Plastics, Inc. Diaphragm valve with leak detection
DE4445589A1 (de) * 1994-12-20 1996-06-27 Danfoss As Membrangesteuertes Ventil

Also Published As

Publication number Publication date
RO119480B1 (ro) 2004-11-30
AU2001241303A1 (en) 2002-07-01

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