WO1998005892A1 - Structure renforcee pour robinet a manchon - Google Patents

Structure renforcee pour robinet a manchon Download PDF

Info

Publication number
WO1998005892A1
WO1998005892A1 PCT/FI1997/000463 FI9700463W WO9805892A1 WO 1998005892 A1 WO1998005892 A1 WO 1998005892A1 FI 9700463 W FI9700463 W FI 9700463W WO 9805892 A1 WO9805892 A1 WO 9805892A1
Authority
WO
WIPO (PCT)
Prior art keywords
hose
pinch valve
similar
valve
foregoing
Prior art date
Application number
PCT/FI1997/000463
Other languages
English (en)
Inventor
Jukka Aaltonen
Jarmo Partanen
Original Assignee
Larox Flowsys Oy
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
Priority claimed from FI963082A external-priority patent/FI963082A0/fi
Application filed by Larox Flowsys Oy filed Critical Larox Flowsys Oy
Priority to AU37719/97A priority Critical patent/AU3771997A/en
Publication of WO1998005892A1 publication Critical patent/WO1998005892A1/fr

Links

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
    • F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/02—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm
    • F16K7/04—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force
    • F16K7/06—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force by means of a screw-spindle, cam, or other mechanical means

Definitions

  • the present invention relates to a valve structure according to the preamble of claim 1
  • Pinch valves are conventionally used in the piping of process industry as stop and/or control valves
  • the main elements of a typical pinch valve are shown in Fig 1 comprising a valve body, an elastic hose and an actuator
  • Fig 1 comprising a valve body, an elastic hose and an actuator
  • Fig 1 To close the valve, two parallel jaws moved by an actuator are pressed against the hose simultaneously from both sides, whereby the lumen of the hose is obstructed thereby cutting off the flow along the piping
  • the elastic hose is conventionally made from rubber into which reinforcements, typically woven textile fabric plies are embedded.
  • the reinforcing layers act as the strength-imparting component of the hose serving to resist the internal pressure, and their quantity is dependent on the pressure rating of the hose
  • the inner rubber lining of the hose both forms the seal zone during the closing of the valve and protects the reinforcing plies against the physical wear and chemical attack imposed by the medium contained in the hose
  • the outer rubber lining surrounding the hose perimeter protects the reinforcing plies against mechanical wear by the pressing jaws
  • the fabrication process of the valve hose requires a great amount of physical labour, because the rubber compound and reinforcing plies must be placed manually over the manufacturing tool While the rubber compound is most conventionally natural rubber or similar, chemically and/or thermally stressing operating conditions of the pinch valve may necessitate the use of special rubber compounds.
  • problems may arise in the adherence of the rubber layers to each other or the reinforcing plies.
  • the hose is a consumable element of the pinch valve that must be replaced when damaged. Eroding media usually invoke the replacement need due to abrasion of the hose inner lining, whereby the valve fails to close tightly. Progress of inner lining abrasion may also expose the reinforcing fabrics, which can cause bursting of the hose.
  • the chemicals passed by and/or elevated operating temperature of the pinch valve may lead to embrittlement of the hose inner lining.
  • pressure shocks travelling in the piping can cause damage to the hose reinforcing fabrics particularly if the reinforcing plies are subjected to chemical attack due to damage in the hose inner lining.
  • hose failure will become evident only through the bursting of the hose or as incomplete closing of the pinch valve.
  • a local hose damage e.g., abrasion damage in the hose inner surface
  • the full length of the hose must be replaced even if otherwise in good condition or not.
  • the entire valve body must be dismantled to carry out the replacement of the relatively stiff hose.
  • a pinch valve according to the invention comprises a body part, an actuator and a valve hose formed by at least two parts including a pressure-resistant hose and an easily replaceable protective hose, or alternatively, components acting as an equivalent lining surface or protective structure.
  • Said replace- able protective hose or equivalent lining surface or protective structure can be inserted inside the lumen of the pressure-resistant valve hose so as to receive therein the erosive/chemical/thermal stresses imposed by the medium contained in the valve hose.
  • a detachable hose can be pulled over the perimeter of the actual valve hose to receive the abrasive action of the pinching jaws.
  • the invention is characterized by having the valve hose assembled into an entity formed from a two or a greater number of detachable parts. This arrangement makes it possible to indicate the need for the protective hose replacement and simplify the servicing operations. As explained above, the valve hose according to the invention is repaired by replacing the damaged component of the hose assembly only, instead of installing an entirely new hose.
  • detachable protective hose according to the invention becomes damaged, it can be readily replaced by a new insertable protective hose element without the need for removing the pressure-resistant reinforced hose element.
  • hose replacement in conventional structures is a relatively uncom- plicated operation, which can be carried out without the use of special tools, the novel hose structure makes valve maintenance still faster.
  • the inside protective hose can be replaced without dismantling the pinch valve, simply by inserting a new inner protective hose element into the lumen of the reinforced hose element. This facility shortens the servicing downtime of the valve appreciably.
  • the manufacturing costs of the detachable protective hose element according to the invention become advantageous, because the hose element can be normally fabricated without any reinforcing plies, whereby its manu- facture will be simplified. Further, the use of a detachable hose element permits the conventional rubber compounds to be replaced by special materials, since no adherence problems with reinforcing plies will be encountered. As such special compounds (e.g. , silicone rubber and fluoro- elastomer compounds) generally are expensive, the valve hose structure according to the invention offers significant savings. To resist chemical attack, a special material is needed for making the detachable inner hose element only, not for the entire thickness of a reinforced integral hose.
  • a detachable inner protective hose element permits the hose structure to be complemented with different kinds of damage indication systems to detect a failure of the inner hose element. If the inner hose element is punctured due to mechanical wear, for instance, the liquid medium contained in the piping can enter the space between the concentric hose elements. By inserting a moisture detector in the interhose space, an immediate indication of inner hose element failure can be obtained.
  • One alternative option is to place a dye in the interhose space. Then, an inner hose element failure will release the dye into the liquid medium contained in the piping, thereby giving a visual indication of a hose damage.
  • the arrangement according to the invention makes it easy to test the compatibility of different elastomer compounds with the medium contained in the piping as the inner hose element is easy to fabricate, the material quantity required for the hose element is small and no adherence problems typically associated with the use of special materials will be met.
  • the pinch valve according to the invention is particularly characterized in that the valve is implemented with standardized hose dimensions, which means that the cross section of the valve hose lumen to flow will not be reduced nor the valve hose length increased.
  • the detachable inner hose element will not be an accessory to be inserted in the lumen of a standard hose, but rather forms a single complementary structure with the pressure-resistant hose element.
  • Figure 1 shows a conventional pinch valve equipped with a single-element integral valve hose viewed from two directions;
  • Figure 2 shows an equivalent pinch valve equipped with a valve hose structure according to the invention.
  • a prior-art pinch valve comprising a body part 1 , an elastic fabric-reinforced hose 2 and an actuator 3, which can be a pneumatic cylinder, for instance.
  • the pinch valve hose 2 has flanges 4, which simultaneously perform a sealing function during the connection of the pinch valve to a piping 5.
  • the actuator closes the lumen of the elastic hose 2 by applying a pressure thereon with the help of parallel jaws 6 placed on both sides of the hose.
  • a valve embodiment according to the present invention comprising a conventional body part 7, an actuator 8 and two parallel pinching jaws 9.
  • the elastic valve hose according to the invention is formed by a body hose 10 capable of resisting the operating pressure of the piping and by at least one detachable inner protective hose element 1 1 inserted in the lumen of the body hose, thus facilitating an easy replacement of the inner hose element(s) .
  • the end of the inner hose element 1 1 is advantageously extended past the flange 12 of the body hose 10 so as to form a sealing flange 1 3.
  • the material of the inner hose element 1 1 can completely protect the other elements of the pinch valve against chemical attack of the medium contained in the piping, simultaneously acting as a seal in the connection of the pinch valve to the piping.
  • This arrangement provides a simple and reliable method of fixing the inner hose element to the pinch valve structure If required, more than one inner hose element 1 1 can be inserted in the lumen of the body hose 1 0, whereby the wall thickness, composition,
  • the inner hose sections 1 1 can be designed to protect either the entire body hose 10 or only a certain section of the body hose
  • the inner hose elements can be arranged in superimposed layers and/or successively extended along the hose length to protect a ⁇ o partial section or sections of the body hose 1 0. If one or a greater number of additional hoses are used to protect only a partial section or sections of the body hose, they are advantageously placed in the interhose space between the full-length inner hose section protecting the body hose and the body hose proper.
  • the detachable inner protective hose element 1 1 provides the required resistance to the mechanical wear and/or chemical attack caused by the medium contained in the piping, as well as a portion of the required thermal resistance.
  • the inner protective hose element 1 1 can be advantageously
  • valve body 1 requires the dismantling of the valve body 1 to permit the replacement of a stiff, pressure-resistant, reinforced valve hose 2
  • a moisture detector can be readily mounted in the interhose space between the inner protective hose element 1 1 and the body hose 1 0, whereby a
  • Such a detector is simply formed by two insulated electrical conductors introduced from outside into the interhose space with the conductor ends left void of insulation in the interhose space. As the interhose space is normally dry, the resistance between the spaced-apart conductor ends will be high. When the interhose space becomes filled with a liquid during a hose failure, the 5 resistance between the conductor ends will be reduced thus indicating a hose failure.
  • a failure detection system based on resistance change can be replaced by other methods such as a system based on capacitance change.
  • the interhose space between the inner protective hose 1 1 and the body hose 10 can be filled with a dye, which is released into the flowing medium during an inner hose element failure.
  • the jaws 9 may cause a failure of the body hose 10 due to external abrasion.
  • the body hose 10 can be protected according to the invention against such external wear by placing a separate detachable sheath element 1 4 at
  • the body hose 10 may in principle be made from a metal wire braid, textile 25 fabric or similar material. Then, the detachable inner protective hose 1 1 conducts the liquid, gas or other medium carried by the piping, while the woven-fabric-reinforced body hose receives the mechanical stresses.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipe Accessories (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

L'invention concerne un robinet, notamment un robinet à manchon comprenant un corps (7) ainsi qu'un ensemble tuyau (10), lequel peut être un tuyau à armature textile, un tuyau à tresse métallique, un tuyau en textile ou en matériau similaire pouvant résister à la pression de fonctionnement de la tuyauterie. Selon l'invention, le tuyau (10) est pourvu d'au moins un chemisage séparé ou d'une structure protectrice similaire (11, 14), laquelle protège l'ensemble tuyau (10).
PCT/FI1997/000463 1996-08-05 1997-08-04 Structure renforcee pour robinet a manchon WO1998005892A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU37719/97A AU3771997A (en) 1996-08-05 1997-08-04 Reinforced pinch control valve structure

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI963082A FI963082A0 (fi) 1996-08-05 1996-08-05 Ventil
FI963082 1996-08-05
FI973140 1997-07-29
FI973140A FI973140A (fi) 1996-08-05 1997-07-29 Venttiili

Publications (1)

Publication Number Publication Date
WO1998005892A1 true WO1998005892A1 (fr) 1998-02-12

Family

ID=26160194

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1997/000463 WO1998005892A1 (fr) 1996-08-05 1997-08-04 Structure renforcee pour robinet a manchon

Country Status (3)

Country Link
AU (1) AU3771997A (fr)
FI (1) FI973140A (fr)
WO (1) WO1998005892A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6991209B2 (en) 2002-12-04 2006-01-31 Tom Ball Flow-regulating device
CN102943895A (zh) * 2012-11-25 2013-02-27 蚌埠新奥燃气有限公司 一种手动pe管止气夹

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI114410B (fi) 1999-04-21 2004-10-15 Larox Flowsys Oy Letkuventtiili

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1079909B (de) * 1955-06-08 1960-04-14 Rene Anrep Schlauchventil mit loesbarer Verriegelungsvorrichtung fuer das Verschlussstueck
US3811649A (en) * 1972-07-20 1974-05-21 Resistoflex Corp Constrictable tube valve with plural wall tube
DE3102363C2 (de) * 1981-01-24 1983-11-03 Deutsche Itt Industries Gmbh, 7800 Freiburg Pneumatisch gesteuertes Ventil
EP0175028A1 (fr) * 1984-09-19 1986-03-26 Mil Mutzarim Techniim (1971) B.M. Vanne hydraulique d'arrêt et d'étranglement
GB2274326A (en) * 1993-01-18 1994-07-20 Kodak Ltd Pinch valve with adjustable reaction member

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1079909B (de) * 1955-06-08 1960-04-14 Rene Anrep Schlauchventil mit loesbarer Verriegelungsvorrichtung fuer das Verschlussstueck
US3811649A (en) * 1972-07-20 1974-05-21 Resistoflex Corp Constrictable tube valve with plural wall tube
DE3102363C2 (de) * 1981-01-24 1983-11-03 Deutsche Itt Industries Gmbh, 7800 Freiburg Pneumatisch gesteuertes Ventil
EP0175028A1 (fr) * 1984-09-19 1986-03-26 Mil Mutzarim Techniim (1971) B.M. Vanne hydraulique d'arrêt et d'étranglement
GB2274326A (en) * 1993-01-18 1994-07-20 Kodak Ltd Pinch valve with adjustable reaction member

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6991209B2 (en) 2002-12-04 2006-01-31 Tom Ball Flow-regulating device
CN102943895A (zh) * 2012-11-25 2013-02-27 蚌埠新奥燃气有限公司 一种手动pe管止气夹

Also Published As

Publication number Publication date
FI973140A0 (fi) 1997-07-29
AU3771997A (en) 1998-02-25
FI973140A (fi) 1998-02-06

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