WO2010129669A1 - Appareil et procédé d'isolation de positionneur de valve de système de commande de fluide compressible - Google Patents

Appareil et procédé d'isolation de positionneur de valve de système de commande de fluide compressible Download PDF

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Publication number
WO2010129669A1
WO2010129669A1 PCT/US2010/033723 US2010033723W WO2010129669A1 WO 2010129669 A1 WO2010129669 A1 WO 2010129669A1 US 2010033723 W US2010033723 W US 2010033723W WO 2010129669 A1 WO2010129669 A1 WO 2010129669A1
Authority
WO
WIPO (PCT)
Prior art keywords
isolation
valve
valve positioner
fluid
fluid communication
Prior art date
Application number
PCT/US2010/033723
Other languages
English (en)
Inventor
Richard James Colony
Victor D. Bruzas
John Leslie Rodgers Iv
Original Assignee
Siemens Industry, Inc.
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 Siemens Industry, Inc. filed Critical Siemens Industry, Inc.
Publication of WO2010129669A1 publication Critical patent/WO2010129669A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0878—Assembly of modular units
    • F15B13/0896—Assembly of modular units using different types or sizes of valves

Definitions

  • the invention relates to compressible fluid control systems, including pneumatic control systems, which utilize valve positioners to operate actuators by regulating fluid flow properties, such as flow rate or pressure.
  • the present invention relates more particularly to methods and apparatus to isolate a valve positioner from its associated control circuits, so that the valve positioner can be removed from the system while maintaining pre-isolation fluid flow properties in the control circuits.
  • a valve positioner can be removed for repair or replacement while maintaining operational status quo in the associated control circuits, without the need to shut down the entire control system.
  • Pneumatic control systems employing compressible fluid media other than air, employ control circuits with actuators that perform control functions.
  • Actuators can regulate operation of remote devices in manufacturing or other process control environments in response to changes in the fluid properties within the control circuit that are regulated by a valve positioner.
  • an actuator is responsive to changes in pneumatic pressure or airflow rate initiated by the valve positioner.
  • Such a typical pneumatic control environment provides a pressurized air supply upstream of the valve positioner. Downstream the valve positioner there are often one or two control circuits coupled to the associated actuator.
  • a bi-directional actuator has a piston, diaphragm or the like pressure transducer that moves in response to variations in pressure supplied from respective control circuits on either or both sides of the transducer.
  • pressure is supplied by a single control circuit to one side of the transducer against counter-biasing force of a spring or other biasing element.
  • the service technician When servicing or replacing a valve positioner, the service technician first shuts down all existing and potential energy sources that are coupled to the positioner. In a typical pneumatic control system this would include all control circuits coupled to the positioner that potentially might contain pressurized air: the upstream air supply as well as related downstream single- or bi-directional actuators that are controlled by the valve positioner. This necessitates placing all related upstream and downstream control circuits at ambient or zero gauge - pressure: effectively shutting down the control system operation. In a factory or other working process control environment, this results in complete shut-down of the controlled environment.
  • each compressible fluid state in each control circuit for example maintaining air pressure at an existing assigned level within a downstream pneumatic actuator circuit, so that an associated valve maintains a designated flow rate within a controlled process
  • shut down the related portion of the factory for example maintaining air pressure at an existing assigned level within a downstream pneumatic actuator circuit, so that an associated valve maintains a designated flow rate within a controlled process
  • lockout devices are provided for each control circuit between the potential energy source and the valve positioner.
  • a lockout device comprises a form of lockable shut-off valve to which the technician applies a servicing lock that prevents unauthorized change in the associated lockout valve status (e.g., unauthorized re-pressurization of the associated control circuit) .
  • the lockout device requires installation and ongoing maintenance of additional components within the control circuit.
  • Each circuit requires a separate lockout device and associated lock, necessitating inspection and confirmation of locked-out status of multiple lockout devices for ' each serviced valve positioner.
  • valve positioner isolation apparatus and method that facilitates isolation of compressible fluid control circuits associated with a valve positioner, so that status quo operational condition of each such circuit can be maintained during valve positioner maintenance or replacement, without need to shut down related control circuits to zero pressure or fluid flow condition.
  • valve positioner isolation apparatus and method that facilitates simultaneous isolation of a plurality of, and more desirably, all control circuits coupled to a valve positioner, so that the entire valve positioner is isolated from all associated control circuits by a single operational step.
  • valve positioner isolation apparatus and method that facilitates lockout of the valve positioner during servicing operations, and preferably prevents unauthorized change of isolation status of the control system.
  • an object of the present invention is to create a valve positioner isolation device that facilitates maintenance or replacement of a valve positioner without shutting down control circuits that are coupled to the valve positioner.
  • Another desirable and complimentary, but not required, object of the present invention is to create a valve positioner isolation device that isolates a plurality, and even more desirably, all control circuits that are coupled to the valve positioner.
  • Another desirable and complimentary, but not required, object of the present invention is to create a valve positioner isolation device that selectively locks out one or more, and even more desirably all control circuits that are coupled to the valve positioner during valve positioner maintenance or replacement operations.
  • An associated, but not required object is ability to prevent unauthorized change of valve positioner isolation status by optional use of a locking device during all operational modes of the valve positioner and associated control system.
  • valve positioner isolation apparatus and methods of the present invention that facilitate isolation of one or more control circuits from their associated valve positioner, so that compressible fluid flow properties therein can be maintained during valve positioner maintenance or replacement.
  • Isolation of the valve positioner from associated control circuits de-couples the valve positioner from any associated energization sources. Isolation thereby accomplishes the need to de-energize all potential energy sources coupled to the valve positioner without shutting down all ongoing processes associated with the control circuit.
  • One aspect of the present invention is a compressible fluid control system comprising a plurality of compressible fluid control circuits.
  • a valve positioner is in fluid communication with each respective control circuit, for regulating fluid flow properties therein.
  • An isolation valve is interposed between each respective control circuit and the valve positioner, having a first operational state that is capable of enabling fluid communication between each respective control circuit and the valve positioner, and a second operational state capable of isolating respective fluid communication there between, while maintaining pre-isolation fluid flow properties in at least one of the control circuits.
  • Isolation valves for a plurality or all of the control circuits optionally may be configured for simultaneous operation in common operational states.
  • the isolation valves for a plurality or all of the control circuits optionally may be incorporated in a common manifold interposed between the valve positioner and the associated control circuits .
  • Another aspect of the present invention is directed to a compressible fluid control system having a plurality of compressible fluid control circuits, and a valve positioner for regulating fluid flow properties within each respective control circuit in fluid communication therewith, and more particularly to a method for selectively isolating fluid communication there between.
  • the method comprises providing an isolation valve interposed between each respective control circuit and the valve positioner, having a first operational state capable of enabling fluid communication between each respective control circuit and the valve positioner, and a second operational state capable of isolating respective fluid communication there between; selectively placing the isolation valve in the first operational state; and selectively placing the isolation valve in the second operational state, while maintaining pre-isolation fluid flow properties in the respective control circuits.
  • a plurality or all of the control circuits may be simultaneously in communication with or isolated from the isolation valve in tandem.
  • one or more of the isolation valves may be locked in a desired operational state with a lockout device.
  • FIG. 1 shows an exploded view of the compressible fluid control system of the present invention in an exemplary industrial process control environment
  • FIG. 2 is a fluid schematic of the present invention in a control circuit for a bi-directional actuator
  • FIG. 3 a partial fluid schematic of the present invention, showing a single-direction actuator embodiment
  • FIG. 4 is a front elevational perspective view of the present invention disconnected from associated control circuits
  • FIG. 5 is a rear elevational perspective view of the invention of FIG. 4;
  • FIGs. 6 and 7 are cross-sectional elevations of the invention of FIG. 4, showing the isolation valve thereof in respective closed and open positions;
  • FIG. 8 is a front elevational perspective view similar to FIG. 4, showing lockout covers
  • FIGs. 9-11 show an alternative embodiment of a rotary lockout valve
  • FIGs. 12-13 show a fragmentary elevational view an alternative embodiment of a linear motion lockout valve.
  • the compressible fluid control system of the present invention is depicted in an exemplary pneumatic control system 20 environment. It should be understood by those skilled in the art that other types of compressible fluid other than air may be utilized as an energy transfer medium within the system.
  • FIGs. 1 and 2 compressed air within the control system 20 control circuits S, 01 and 02 is in communication with a known actuator 30.
  • the exemplary actuator 30 in FIGs. 1 and 2 is a bi-directional type that is used to regulate flow within a pipe of a controlled process.
  • the actuator 30 includes a pair of chambers 32 and 35 with a diaphragm, piston or the like 34 that translates in response to the differential pressure between Pi and P 2 provided by respective associated control circuit lines 01 and 02.
  • Diaphragm 34 translation in turn causes translation of the shaft 36 along axis A, thereby generating the mechanical force needed to change actuation status of the ultimately controlled device within the controlled industrial process (e.g., to open, close or regulate partial throttling of a supply pipe within an industrial process) .
  • FIG. 3 an alternative single-direction actuator 30" is shown that has a single pressurized chamber 32", which causes translation of the piston 34" as a function of the pressure differential between pressurized air P 1 supplied by control circuit 01' and the resetting biasing force F ⁇ 3 ⁇ generated by biasing springs 37' .
  • the pressure P A ⁇ v in the spring chamber is understood to be localized atmospheric pressure that is vented to ambient air or via a return blow-off line 02 (not shown) .
  • Isolation manifold 40 includes a manifold body 42 that is coupled to the valve positioner 80.
  • the manifold body defines internal ports 4S, 401 and 402 that are respectively coupled to and in fluid communication with the control circuits S, 01 and 02.
  • Valve positioner 80 receives compressed air from the supply 38 via port 4S and throttles it to lower pressures Pj, P_> that are routed to the respective control circuits 01, 02 via ports 401 and 402 (assuming for simplified presentation herein that the control circuits 01, 02 experience little or minimal relative pressure losses) .
  • isolation valve 60 is interposed between the valve positioner 80 ports 4S, 401, 402 and the respective control circuits S, 01 and 02.
  • the valve 60 is shown as a linearly actuated spool valve assembly having corresponding valves VS, VOl, V02 for each control circuit.
  • One, a plurality, or advantageously all of the valves VS, VOl and V02 of the spool valve assembly 60 may be independently or simultaneously controlled as a matter of design choice.
  • simultaneous actuation of all isolation valves associated with control circuits coupled to the valve positioner 80 allows the service technician to isolate the valve positioner from the entire control system with minimal effort.
  • FIG. 1 and 2 is shown as an integrated structure that controls all related control circuit valves in a single actuation.
  • Other isolation valve assembly embodiments will be described below, it being understood that one skilled in the art may choose any valve design ' that performs the intended isolation functions of the present invention that are described herein.
  • Isolation manifold 40 is shown in greater detail in FIGs. 4-3.
  • the manifold body 42 is an interface component between the valve positioner 80 and the related control circuits S, 01 and 02.
  • Valve positioner 80 abuts against a front engagement surface of the manifold body 42; a fluid seal between those components is maintained by exemplary o-rings 43 that circumscribe each of the ports 4S, 401 and 402 on the front engagement surface.
  • the manifold is in fluid communication with respective control circuits S, Ol and 02 via threaded outlets 44, 45, 46 for mating with corresponding male fluid fittings of the control circuits.
  • Alternative known fluid connection to the control circuits may be accomplished by quick-disconnect fittings (not shown) .
  • each control circuit may incorporate pressure gauges GS, GOl, GO2 that may be coupled directly to the manifold body 42.
  • the isolation valve assembly spool valve 60 embodiment is shown in respective closed and open positions in FIGs. 6 and 7.
  • the spool valve 60 has a shaft 62 with respective end stops 63, 64 that limit linear motion of the valve assembly.
  • Shaft 62 has necked portions 66, 67 and 68 with paired o-rings 65 axially displaced above and below each necked portion, for preservation of fluid sealing properties in each separate control circuit.
  • the valve is in a closed position when the neck portions are axially displaced from respective pairs of ports and control circuits S-44-4S, 01-45-401 and 02-46-402.
  • the necked portions 66, 67, and 68 are aligned with their respective pairs of ports and control circuits, enabling fluid communication across the isolation valve 60.
  • the isolation valve shaft 62 defines recesses 70, 72 for receipt of a lockout pin 90.
  • the isolation valve 60 is locked in it chosen open or closed position, thereby preventing unauthorized change of isolation status.
  • Pin ring 91 may be attached to the pin 90 for ease of insertion or removal.
  • the pin circumference may include a threaded portion for threaded insertion into mating threads formed in the manifold body 42 for secure affixation.
  • a lockout cap 92 may be provided to inhibit unauthorized access to the locking pin 90, so that the isolation valve may be maintained in either closed or open operational status at the choice of the field technician.
  • the field technician may secure a lock 93 to the lockout cap 92, using known techniques.
  • Additional covers 94, 96 may provided on the ends of the isolation valve 60 for weather or other environmental protection purposes.
  • FIGs. 9-11 show an alternative embodiment of isolation valve 60' employing rotary on-off motion.
  • FIGs. 12 and 13 are fragmentary elevational views of a cage-type linear isolation valve 60".
  • the cage valve 60" has a generally annular outer cage 6OA” having radially staggered ports that mate with corresponding manifold ports 4S and control circuit S.
  • O-rings 65" are oriented above and below each port/control circuit.
  • a necked reciprocating valve 60" is translated to align a necked portion with each respective port/control circuit to establish fluid communication when the valve is open.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention porte sur un appareil d'isolation de positionneur de valve (40) et sur des procédés associés qui facilitent l'isolation d'un ou plusieurs circuits de commande de fluide compressible (S, O1, O2, par exemple, dans des systèmes de commande pneumatiques) à partir de leur positionneur de valve associé (80), de telle sorte que les propriétés d'écoulement de fluide compressible dans ceux-ci peuvent être maintenues lors de l'entretien ou du remplacement d'un positionneur de valve. L'isolation du positionneur de valve (80) par rapport à des circuits de commande associés (S, O1, O2) découple le positionneur de valve de sources d'excitation associées. L'isolation ainsi remplit le besoin de désexcitation de toutes les sources d'énergie potentielles couplées au positionneur de valve sans arrêter tous les processus en cours associés au circuit de commande. Des caractéristiques de verrouillage associées (90, 92, 93) de la présente invention, conjointement avec la valve d'isolation (60, 60', 60''), empêchent un accès et un changement non autorisé de l'état fonctionnel de la valve d'isolation.
PCT/US2010/033723 2009-05-08 2010-05-05 Appareil et procédé d'isolation de positionneur de valve de système de commande de fluide compressible WO2010129669A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17661909P 2009-05-08 2009-05-08
US61/176,619 2009-05-08

Publications (1)

Publication Number Publication Date
WO2010129669A1 true WO2010129669A1 (fr) 2010-11-11

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PCT/US2010/033723 WO2010129669A1 (fr) 2009-05-08 2010-05-05 Appareil et procédé d'isolation de positionneur de valve de système de commande de fluide compressible

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011128345A1 (fr) * 2010-04-12 2011-10-20 Siemens Aktiengesellschaft Ensemble comprenant un régulateur de position électropneumatique et un entraînement pneumatique et dispositif d'arrêt pour un tel ensemble
WO2019094354A1 (fr) 2017-11-07 2019-05-16 Black Diamond Engineering, Inc. Système de positionneur/régulateur de soupape de commande remplaçable à la chaîne
US10670054B2 (en) 2017-10-25 2020-06-02 Dresser, Llc Constructing valve positioners for hazardous areas
US11306748B2 (en) 2017-10-25 2022-04-19 Dresser, Llc Constructing valve positioners for hazardous areas

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2701654A1 (de) * 1977-01-17 1978-07-20 Brill Ingenieur Ges Mbh Aufbauplatte fuer hydraulische und pneumatische systeme
JPH1038119A (ja) * 1996-07-26 1998-02-13 Ckd Corp マニホールド
EP1041325A2 (fr) * 1999-03-31 2000-10-04 Festo AG & Co Assemblage de soupapes
EP1780421A1 (fr) * 2005-10-26 2007-05-02 Festo Ag & Co. Batterie de soupapes
WO2007101506A1 (fr) * 2006-03-09 2007-09-13 Festo Ag & Co. Kg Batterie de distributeurs à distributeur de sécurité

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2701654A1 (de) * 1977-01-17 1978-07-20 Brill Ingenieur Ges Mbh Aufbauplatte fuer hydraulische und pneumatische systeme
JPH1038119A (ja) * 1996-07-26 1998-02-13 Ckd Corp マニホールド
EP1041325A2 (fr) * 1999-03-31 2000-10-04 Festo AG & Co Assemblage de soupapes
EP1780421A1 (fr) * 2005-10-26 2007-05-02 Festo Ag & Co. Batterie de soupapes
WO2007101506A1 (fr) * 2006-03-09 2007-09-13 Festo Ag & Co. Kg Batterie de distributeurs à distributeur de sécurité

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011128345A1 (fr) * 2010-04-12 2011-10-20 Siemens Aktiengesellschaft Ensemble comprenant un régulateur de position électropneumatique et un entraînement pneumatique et dispositif d'arrêt pour un tel ensemble
US10670054B2 (en) 2017-10-25 2020-06-02 Dresser, Llc Constructing valve positioners for hazardous areas
US11306748B2 (en) 2017-10-25 2022-04-19 Dresser, Llc Constructing valve positioners for hazardous areas
WO2019094354A1 (fr) 2017-11-07 2019-05-16 Black Diamond Engineering, Inc. Système de positionneur/régulateur de soupape de commande remplaçable à la chaîne
EP3707417A4 (fr) * 2017-11-07 2021-02-24 Black Diamond Engineering, Inc. Système de positionneur/régulateur de soupape de commande remplaçable à la chaîne

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