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
  • F16K47/00—Means in valves for absorbing fluid energy
  • F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
• • 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
  • Y10T137/8593—Systems
  • Y10T137/86493—Multi-way valve unit
  • Y10T137/86718—Dividing into parallel flow paths with recombining
  • Y10T137/86734—With metering feature
• • 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
  • Y10T137/8593—Systems
  • Y10T137/86493—Multi-way valve unit
  • Y10T137/86718—Dividing into parallel flow paths with recombining
  • Y10T137/86759—Reciprocating
  • Y10T137/86791—Piston

Definitions

• This invention relates to a valve for regulating and/or shutting off the liquid flow in a conduit, com ⁇ prising a stationary cylinder tube incorporated in a valve housing for the conduit and having a series of through holes through which liquid can pass in radial jets from an inlet member of the valve housing surround- ing the cylinder tube to an outlet member communicating with the interior of the cylinder tube; a reciprocating piston mounted in the cylinder tube and comprising a body member and a cylindrical member projecting axially there ⁇ from, said body member and said cylindrical member together defining an open cavity within the piston; and a distributing means fixedly mounted in the cylinder tube and receivable in said cavity, said distributing means consisting of a plurality of walls (e.g.
• valve piston is connected by means of a spindle to a compressed-air-operated setting mechanism serving to move the piston not only to its clos- ing and opening end positions, but also to optional inter ⁇ mediate positions in which the piston but partially covers the cylinder-tube holes.
• Valves of this type are especially well suited for regulating and shutting off the liquid flow in conduits at extremely high liquid pressures.
• Such valves are advantageously used in feed water conduits of nuclear reactors, where the pressure of the water often amounts to 25 bar or more.
• An important advantage of the valve arrangement described is that the reciprocating piston can be rapidly and accurately moved to its closing position also at extremely high liquid pressures. This is due to the fact that the piston moves perpendicularly to the liquid jets entering radially through the cylinder-tube holes and successively closes the holes. Thus, the setting mechanism will not be exposed to the full force of the liquid rushing through the conduit at high pressures.
• the piston will be acted upon by comparatively important forces from the part flows with which it comes into contact, and the piston and the asso- ciated spindle may then be set in self-oscillation. If the oscillations in the piston are intensified and propagated to the conduit system, it may become necessary to close the valve and put it out of use temporarily.
• the object of the present invention is to obviate the above inconvenience in prior-art valves of the type described, providing a valve which cannot be set in vibration. According to the invention, this object is achieved by a valve having the characteristics recited in appended claim 1.
• FIG. 1 is an axial, partly simplified section of a valve according to the invention, the valve piston being shown in opening position
• FIG. 2 is a similar section
• the valve piston being shown in closing position
• FIG. 3 is an enlarged cross-section of a cylinder tube forming part of the valve and equipped with a distributing means
• FIG. 4 is a perspective view of the distributing means
• FIG. 5 is a longitudinal section of the distributing means.
• a valve housing generally designated 1 comprises an inlet member 2 adapted for connection to an incoming conduit (not shown) , and an outlet member 3 adapted for connection to an outgoing conduit.
• a partition 5 having an opening 4 separates the inlet member 2 from the outlet member 3.
• a cylinder tube 6 is incorporated in the inlet member 2 and has, at its lower part, a plurality of small through holes 7 which are distributed along the periphery of the tube according to a specific pattern (the holes may be of different size and shape, but are usually of circular cross-section).
• the cylinder tube 6 is main ⁇ tained in place in the valve housing by an end wall 8 secured to the valve housing by a screw joint.
• the inlet member 2 has such a shape that the incoming liquid can flow all around the lower part of the cylinder tube 6. In this manner, the incoming liquid will pass through all the open holes 7 in radial jets directed towards the centre axis of the cylinder tube.
• An axially reciprocating piston 9 is arranged in the cylinder tube 6 and comprises a body member 10 and a cylindrical member 11 projecting axially downwards there ⁇ from. Together, these two members define an open cavity 12 in the- iston; -By s. spindle or shaft 13, the piston is connected to a setting mechanism (schematically illustrat- ed at 14) which is driven by compressed air and serves to move the piston axially inside the cylinder tube.
• a distributing means, generally designated 15, is fixedly mounted in the lower part of the cylinder tube 6 and consists of a plurality (in this case four) walls 16 extending radially from a central connecting point and dividing the interior of the cylinder tube into a number of sector-shaped compartments 17.
• the radial walls 16 are kept together by a lower ring 18 which is immobilised between an internal shoulder on the cylinder tube and a seating adjacent to the opening 4 in the partition 5.
• the outer edges of the radial walls 16 are bevelled so as to correspond to the conicity of a bevel 19 on the inside of the cylindrical member 11 of the piston.
• the transitional area 22 between the plate and the annular flange 21 is gently rounded, at least on the inside.
• the diameter of the plate 20 is so large that the plate entirely covers the upper end edges of the radial walls 16, the outer diameter of the annular flange 21 suitably being but slightly smaller than the inner diameter of the cylindrical member 11 of the piston. In practice, the.
• annular flange 21 may have an outer diameter of 210 mm, while the smallest inner diameter of the cylindrical mem ⁇ ber 11 is 215-220 mm. If so, the plate 20 may have a thickness of about 10 mm, and the height of the annular flange 21 may then amount to 40-50 mm, conveniently about 45 mm.
• the described valve operates as follows.
• the piston 9 When the piston 9 is set in a completely or partly opening position in which all or some of the holes 7 are uncovered below the lower edge of the cylindrical member 11, the liquid entering the inlet member 2 will pass through the holes 7 in radial jets which, as a function of the current liquid pressure, impinge upon the radial walls 16 of the distri ⁇ buting means 15 with great force. In doing so, the jets disintegrate to form smaller part flows directed both downwards towards the outlet member 3 and upwards towards the cover plate 20.
• the part flows directed towards the cover plate 20 will, when impinging upon the plate, first be directed radially outwards and subsequently be diverted by the annular flange 21 and guided in substantially axial, downwardly-directed paths of motion inwardly of the cylindrical member 11.
• these axial liquid part flows will in turn be hit by the incoming radial liquid jets from the holes 7 and thus be further divided into diffuse or indifferent flows, which are still further divided.
• the latter will not possess any great inherent force capable, when contacting the piston, of setting it in vibration.
• the annular flange 21 of the invention ensures that the comparatively strong part flows which are directed upwards towards the cover plate 20 when the incoming radial jets come into contact with the radial walls 16, will be diverted in axial, downward ⁇ ly-directed paths of motion at a distance inwardly of the cylindrical piston member, which will thus not be exposed to any considerable forces by the liquid flowing through the valve.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Nozzles (AREA)
• Fluid-Driven Valves (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

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ID=20383794

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (12)

Citations (2)

Family Cites Families (2)

• 1991
  • 1991-09-23 SE SE9102745A patent/SE469088B/sv not_active IP Right Cessation
• 1992
  • 1992-08-20 WO PCT/SE1992/000561 patent/WO1993006400A1/en active Application Filing
  • 1992-08-20 US US08/193,067 patent/US5427147A/en not_active Expired - Fee Related
  • 1992-08-20 AU AU26731/92A patent/AU2673192A/en not_active Abandoned
  • 1992-08-20 GB GB9405686A patent/GB2275523B/en not_active Expired - Fee Related

Patent Citations (2)

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