FR2503826A1 - VALVE DISASSEMBLY TOOL - Google Patents

Abstract

THE OPERATING DEVICE OF A VALVE DISASSEMBLY TOOL 10 IS IN THE FORM OF TWO MUTUAL ELEMENTS: A TUBULAR PISTON 104 HAVING A WORKING HEAD 114 AT AN END, AND A ROTATING ROD, DOES NOT RISE 76. HOUSING 12 OF THE TOOL FORMS A CYLINDER 108 FOR THE PISTON AND SUPPORTS THE ROD. THE PISTON IS CLAVETE TO THE ROD IN 86 TO TURN WITH IT. THE PISTON IS ACTUATED BY A PRESSURIZED FLUID AND IS DOUBLE-ACTING, TWO PRESSURIZATION PORTS 88, 90 BEING CONVENIENT IN THE HOUSING. THEREFORE THE HEAD CAN BE ADVANCED AND BACKWARD WITHOUT BEING ROTATED, APPLYING THE FLUID TO THE AXIS OPPOSITELY SIDED FROM THE PISTON, AND THE HEAD MAY BE ROTATED WITHOUT BEING ADVANCED OR BACKWARDED, BY ROTATING THE ROD. A CRANK 78 ALLOWS TO ROTATE THE ROD. THE HOUSING HAS AN OBSERVATION ORIFICE 136 TO INSPECT THE POSITION OF THE PISTON IN SPACE AND TO ENSURE THE LONGITUDINAL AND ANGULAR POSITION OF THE HEAD.

Description

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  1. The present invention relates to a device which can be used in mounting and dismounting a valve,

  while the pressure control is maintained in a system

  pipe or the like located immediately upstream of the valve location. Common names for the device of this particular type are "plugging tool" and "valve disassembly tool". Typically, when a valve must be removed from a pipe, it is closed and the

  flange located at its downstream end is removed from the system

  me. The tool is fitted with a plug and tightly attached to the flange. The valve is then opened and the tool

  maneuvered so as to insert the plug, via-

  re of the section downstream of the through hole of the housing and the valve cavity, in the section located upstream of the through hole of the housing where it is held in place

  tightly in the bore of the pipe joint or ana-

  log located immediately upstream of the valve. For this purpose, the pipe joint, for example, may have been originally fitted with an internal thread intended to come to couple

  with the external thread of the pipe plug. The opera-

  Once the plug has been inserted, the head of

  the tool is removed from the cap, and the valve can be removed

  safely. When installing a repaired, reconditioned valve, from a different valve to a new valve in the pipe fitted with a plug, the tool

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  2. or a similar tool can be used in the same way to disassemble and remove the plug, whereupon the valve can be closed, and the downstream pipe reconnected to the valve. The actuator of a valve disassembly tool has two elements linked to each other: a tubular piston having a working head at one end, and a rotary rod which does not rise. The tool housing constitutes a cylinder for the piston and supports the rod. The piston is keyed to the rod to be able to turn

  with her. The piston is actuated by the pressure of a fluid.

  of and is double-acting, two respective pressurization orifices being practiced in the housing. Therefore, the working head can be advanced and moved back without being rotated, by applying the fluid pressure to the axially opposite sides of the piston, and be rotated

  without being advanced or concealed, by rotating the rod.

  A crank makes it possible to turn the rod. Housing

  has an examination hole to inspect the position

  tion of the piston in space, and thus ensuring the

  longitudinal and angular position of the working head.

  The present invention will be well understood when

  of the following description made in conjunction with the drawings

  attached in which: FIG. 1A is a longitudinal section view of an end (exterior) part of the valve disassembly tool; and Figure 1B is a longitudinal sectional view

  on the other extreme (inner) part of the removal tool

valve stage.

  Figures 1A and 1B can be joined together along the dashed lines A-A, B-B to give an indication of the appearance and structure of the tool. In practice, the tool can be relatively more

  long, or shorter, so as to obtain a long extension

  greater, or smaller, maximum gitudinal of the head

of work.

  The valve disassembly tool 10 has a 3. housing 12 which comprises a tubular body 14 having an inner end cap 16 and an end cap

  exterior 18. Each hat has a respective extreme wall.

  ve 20, 22 provided with a respective central opening 24, 26 and a respective tubular skirt 28, 30. The caps 16,

  18 are screwed onto the respective ends of the tu-

  bulaire 14 en 32, 34, hat-body ring seals

  being provided in 36, 38. The caps are held in place

  this by means of pressure screws 40, 42, respectively.

  Each cap has coaxially, a tubular boss 44, 46 extending from its end wall in the direction axially opposite to that of its skirt. The inside diameter of each boss 44, 46 is somewhat greater than the diameter of the opening central 24, 26 of the end wall of the respective cap, so as to form a

  annular support shoulder, respectively, for the ex-

  end of a respective stack 48, 50 of rolling elements

annular sealing.

  At the inner end, the stack 48 is now

  bare in place by a split retaining ring 52 which is mounted in an inner circumferentially extending groove, opening radially inward of the boss 44. At the outer end, the stack 50 is held in place by a member trim retainer 54 which sits on

  the axially outer end of the boss 46 and by cons

  sequent overflows from the boss along a limited extent.

  The packing retainer 54 is, in turn, held in place by another shaped bearing housing

  hat 56, which has an end wall 58 and a ju-

  eg tubular 60. The skirt 60 is internally threaded with

  so as to be screwed onto the boss 46 until its shoulder

  Lement interior 62 abuts against the lining retaining member 54. A pressure screw 64 blocks the housing 56 in position. The end wall 58 has a central opening 66. Inside the end wall, there is provided a circumferential groove opening radially inwards for the reception of an annular radial bearing 68 and an annular scraper of rod 70. The opening 66 has a

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  4. diameter smaller than the inside diameter of the skirt 60 so as to form a bearing chamber in which two stacks 72, 74 of bearing elements are received,

an axial gap separating them.

  The bearings 68 and 72, 74 support, respectively, radially and axially a rotary rod 76, not rising

  not, which protrudes from the bearing housing 5.6 in steps

  health through the central opening 66. Outside the accommodation,

  the rod 76 includes a means which allows the rotation thereof.

  pique, it consists of a hand crank 78 attached to the outer end of the rod at 80. (The means for rotation could be a flywheel, a motor

with gear or the like).

  The rod 76 extends axially inwardly passing through the boss 46 in which it is radially supported and sealed against the end cap 18 by the stacking 50 of annular rolling elements and sealing. The rod 76 extends on the other hand, axially inwards, passing through the central opening 26 of the

  end cap 18 for entering a cylindrical chamber

  that 82 formed inside the housing 14 between the cha-

  skins 16, 18. The inner end in the axial direction of the rod 76 is located at 84 near the end

  axially inside the chamber 82.

  Over substantially the entire length of the chamber 82, the rod 76 has a keyway 86 extending essentially in the longitudinal direction, which

  opens radially outwards.

  The housing has two pressurization orifices

  tion of chamber 82, one of the orifices (88) being located at

  the axially inner end of the chamber 82 and the au-

  orifice (90) at the axially outer end of this

this one.

  To form hole 88, the side of the wall ex-

  very 20 of the cap 16 opposite the chamber 82 is rai-

  in the perimeter direction of the central opening 24 of

  so as to form a recess which receives a sealing ring

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  5. annular tee 92 on which an annular element 94 which acts as a retaining member for the ring 92 rests and

  sliding bearing for the piston (description will be short

  you later). An annular, radial flange portion 96 of this annular element 94 sits on the wall 20 in the perimeter direction of the groove in which the ring 92 is received. This flange 96 extends radially outside the inner wall of the boss 44 so that, during the screwing of the cap 16 on the body 14, it is sandwiched between the axially inner end of the body 14 and the end wall 20 of hat 16.As

  we see on the left of Figure 1B, the axial face-

  outer flange 96 has a groove 98

  extending radially which forms a channel around the end

  axially interior of the body 14. This channel makes

  provide the chamber 82 with the interior wall of the boss 44. At the place where the channel 98 opens against the boss

  44, an opening 100 is made radially in the bos-

  wise. This opening 100 is internally threaded out

  You can connect a conduit communicating with a source of pressurized fluid (for example air or a

  hydraulic fluid). Opening 100 and channel 98 constitute

kill port 88 together.

  To form the orifice 90, an opening is internally threaded in the radial direction in the end wall 22 of the cap 18 at a level which communicates with the chamber 82 in line with the axially external end of the body 14. The internal thread serves to connect a pipe

  pressurized fluid supply.

  Inside the chamber 82 is received by coulis-

  in the axial direction a tubular piston element 102, This element comprises a tubular piston part

  104 which is externally provided with two circumferential seals

  differential 106 axially distant from each other, in

  sliding contact with the inner wall 108 of the body 14.

  Between the seals 106, the piston 104 includes a means of

  then radial, for example a segment 109. Inside, the piston 104 has a key which is trapped in

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groove 86.

  In FIGS. 1A and 1B, the piston element 102 is shown in the fully retracted position,

  that is to say with the piston 104 located at the axia-

  Lement exterior of the chamber 82. The piston element further comprises a tail

  monobloc tubular 110 which extends coaxially towards the

  from the piston portion 104. This tail

  has such a length that even when the piston is fully

  Lement brought back, as shown, it leaves the chamber through it and sliding in sealed contact with the ring 92, passing through the central hole 24 of the cap 16, in sliding contact, sealed and support with the stack 48 of annular rolling and sealing elements and at the level, axially inwards, of the axially inner end 112

  tubular boss: 44 of the inner end cap.

  Therefore, when the end 112 of the bossa-

  ge 44 is subject to the corresponding flange of the valve housing which must be installed or removed, the part

  of the piston tail shown in Figure 1B will be in sail-

binds in the valve housing.

  This exposed part of the piston tail com-

  takes the working head 114 from the tool. The details of this-

  The head will be given by way of illustration. Here, the head includes a ball check valve 116 screwed into a

  circumferential boss internally threaded in a bore

  longitudinal ge 118 of the tail 110. The valve 116 comprises a body 120 made tight vis-à-vis the bore by an annular ring 122. A channel 124 of the body 120 comprises a valve seat against which a ball is supported 126 under the effect of a spring 128 which is mounted in the body 120

  by a tubular valve retaining member 129, which

  titue an extension of the channel 124. The body 120 further comprises a rib 130 extending coaxially inwardly which has an end shaped surface 132

  used to grip the valve to be installed or removed

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  7. vee. All these elements are enclosed in the bore of the

  tail 110 of the piston although close to its short end

  free interior dialing. At surface 132, the

  piston rod is internally grooved and circumferen-

  so as to receive an O-ring 134, as well as to come circumferentially to engage in the valve

  which must be installed or removed.

  A typical tool 10 of the present invention has dimensions which allow a stroke of the piston of 30 cm between the completely recessed position shown in Figures 1A and 1B and the position of full thrust, easily imaginable the piston 104 would be located near the axially inner end of the chamber 82, for example near the cap 16, and the tail with its working head would protrude from the end 112 of the cap 16. Other lengths

  maximum extension are possible, for example by replacing

  erasing the body 14, the piston element 102 and the rod 75 by a longer assembly. The relationship of embedding the piston element and the rod, each being mounted mainly

  sliding in a cap opposite end of the lo-

  or on such a hat, constitutes a device to

  smooth operation, even when the thrust requires

  re is quite large. This allows access to locations

  plugs which are quite inaccessible, being located

  basically in a valve bore and bore housing

of conduct or the like.

  In operation, the work head is extended and

  retracted by pressurization of the respective orifice of the housing

  while allowing the other port to proceed

  evacuation or purge, and the head is rotated (in-

  depending on the extension / return operations

  re) by rotating the rod 76 (on which the piston is

  keyed). The rod 76 is rotated using the ac-

  outside holder, for example crank 78, mounted

  on the end of the tool opposite the head.

  For uses where, for one reason or another, the arrangement in the head space

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  8. work becomes an object of curiosity, while the tool is running, the cap 16 preferably comprises an examination orifice 136, for example extending radially

  in the end wall 20 so as to cut the tail of piss

  tone between the seals as shown. To facilitate this analysis, the piston tail can

  externally include markers (not shown) indi-

  as various longitudinal and angular positions. The ex-

  radially outer end of the orifice 136 is threaded and normally receives a closure plug 138 for the protection of the piston tail until it is necessary

  or that we wish to make an observation.

  There is no need to build in material.

  special riau any part of the device 10.

  The present invention is not limited to the examples

  ples of realization which have just been described, it is on the contrary

  susceptible to modifications and variations which appear

go to the skilled person.

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9.

Claims (4)

  1 - Valve disassembly tool, characterized in that it comprises: - a housing comprising - a tubular body having opposite end cap means forming a chamber inside the body;   - a tubular piston received in sliding at the   interior of the chamber and having a tail portion extending   sliding sliding, out of the housing passing through one of the end cap means; - A working head mounted on the tail part actually located outside the housing to grip a valve to be installed in a valve housing or to be extracted therefrom; - A non-rising rod mounted for rotation in the housing, this rod being received by fitting into the tubular piston and extending in leaktight manner outside the housing via the other end cap means; - a means mounted on the rod outside the housing of the tool to rotate the rod, - a means effectively keying the rod to the working head of the piston so that, during the rotation of the rod, the head of work turns accordingly; - first and second fluid pressurization orifices made in the housing so as to allow communication with the chamber on the effectively opposite sides of the piston so that, during the pressurization of the chamber, via an orifice while the other orifice is vented, the piston and working head move longitudinally in an axial direction and during pressurization of the chamber through the other port while the first port is vented, the piston and   working head move longitudinally in the direction   opposite axial tion, from which it follows that the working head can be extended and retracted without being rotated and   can rotate without being extended and retracted. $ 2503 82   10. 2 - Tool according to claim 1, characterized in that the means for rotating the rod comprises   a hand crank attached to the rod.   3 - Tool according to claim 1, characterized in that the rod is effectively keyed to the head of   work by being keyed to the piston.   4 - Tool according to claim 1, characterized in that it further comprises an observation orifice made in the housing in a place where the piston can be observed while the tool is running, so as to   have an indication of the layout of the work head-- vail in space.