EP1266143B1 - Robinet sans fil, a securite intrinseque - Google Patents

Robinet sans fil, a securite intrinseque Download PDF

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Publication number
EP1266143B1
EP1266143B1 EP01918848A EP01918848A EP1266143B1 EP 1266143 B1 EP1266143 B1 EP 1266143B1 EP 01918848 A EP01918848 A EP 01918848A EP 01918848 A EP01918848 A EP 01918848A EP 1266143 B1 EP1266143 B1 EP 1266143B1
Authority
EP
European Patent Office
Prior art keywords
signal
valve
transmitter
optical
receiver
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP01918848A
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German (de)
English (en)
Other versions
EP1266143A2 (fr
EP1266143B2 (fr
Inventor
Richard E. Schnell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ross Operating Valve Co
Original Assignee
Ross Operating Valve Co
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Filing date
Publication date
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Application filed by Ross Operating Valve Co filed Critical Ross Operating Valve Co
Publication of EP1266143A2 publication Critical patent/EP1266143A2/fr
Publication of EP1266143B1 publication Critical patent/EP1266143B1/fr
Application granted granted Critical
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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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/0426—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with fluid-operated pilot valves, i.e. multiple stage valves
    • 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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means

Definitions

  • the present invention relates generally to intrinsically safe valves and, more particularly, to valves that employ a piezo-electric element that operates using minimal electrical energy.
  • Chemical management systems require significant consideration towards minimizing the potential for igniting such chemicals. Chemical management systems typically are designed so that arcing and sparks which often result from connecting and disconnecting electrical circuits is minimized. Presently, such chemical management systems utilize expensive wiring and switch elements in order to achieve this goal.
  • a valve system employs a low voltage element, such as a piezo-electric element, to activate a fluid flow valve so as to use a minimal amount of electrical energy.
  • the piezo-electric element activates a pilot pressure valve, which allows a control fluid to pass to a main control valve.
  • the control fluid causes the main control valve to activate a pneumatic rotary operator, which is turn operates the fluid flow valve.
  • a switching assembly is employed to activate the piezo-electric element.
  • the switching assembly can include various types of switching devices, such as RF switching devices, optical switching devices, infrared switching devices and low voltage electrical switching devices, to allow the valve to be controlled from a remote location.
  • FIG. 1 is a plan view of an intrinsically safe valve system 10 according to the invention.
  • the valve system 10 includes a valve activation assembly 12, a transmitter 14, a working element 16 and a fluid valve 18.
  • the transmitter 14 transmits a signal 24 from an antenna 26 that is received by an antenna 30 associated with the valve assembly 12.
  • the signal 24 is an RF signal, but as will be discussed in more detail below, other signals can be used, such as optical signals, infrared signals, and low voltage signals.
  • the signal 24 may be encoded by the transmitter 14 so that only a particular valve assembly 12 operates in response to the signal 24.
  • the valve assembly 12 may be addressable to distinguish a particular valve assembly 12 from other valve assemblies.
  • valve assembly 12 When the valve assembly 12 receives the signal 24, it activates the working element 16, which opens or closes the fluid valve 18 depending on its normal state.
  • the valve 18 controls the flow of chemicals between a first side 20 and a second side 22.
  • the valve 18 can be any type of actuator that operates under low voltage. Particularly, the valve 18 can be any actuation device that can benefit from the system described herein.
  • the receiver 28 includes a detector 30 that detects the signal 24 from the antenna 30.
  • a battery 32 provides electrical energy to the receiver 28.
  • the receiver 28 includes a non-contacting switch 34 responsive to the signal 24 from the antenna 30. If the transmitter 14 encodes the signal 24, the non-contacting switch 34 responds only if the receiver 28 is the properly addressed receiver.
  • the pilot valve 36 includes a piezo-electric switch assembly 38 attached to a valve body 40 of the valve 36.
  • the switch assembly 38 includes a piezo-electric element whose structural configuration changes in response to a voltage, as is well understood in the art .
  • the piezo-electric element can be any piezo element suitable for the purposes described herein. In alternate embodiments, the piezo-electric element can be other types of low voltage elements suitable for the purposes described herein, such as those that employ bending element technology, such as ceramic elements.
  • the valve 36 is a two position valve which supplies input air at a pilot pressure to a pilot line 42.
  • the assembly 38 includes a baffle (not shown) which deflects upon application of a voltage. Deflection of the baffle opens a small orifice to allow air at the pilot pressure to be applied to the pilot line 42, which is then applied to a main spool or poppet valve 44.
  • the pilot valve 36 is embodied as a commercial available valve.
  • the main valve 44 controls application of input air and exhaust to the working element 16.
  • the main valve 44 applies input air to displace the working element 16.
  • the working element 16 may be embodied as a pneumatic, rotary operator for the valve 18.
  • the valve 18 may be embodied as a butterfly valve so that displacement of the working element 16 opens and closes the valve 18.
  • the pilot valve 36 cuts off the supply of pilot pressure to the pilot line 42. This in turn displaces the main valve 44 to a deactuated position, which displaces the working element 16 to its initial position, thereby closing the valve 18.
  • FIG. 2 depicts an intrinsically safe valve system 50, according to another embodiment of the present invention.
  • the valve system 50 is arranged similarly to the valve system 10, and like reference numerals will be used to designate like elements. Such like elements will not be described with respect to Figure 2 as they operate as described with respect to Figure 1.
  • an optical actuation system 52 replaces the transmitter 14 and the receiver 28 of the system 10.
  • the system 52 includes a fiber optic switch 54 that outputs an optical signal on a fiber optic cable 56.
  • the fiber optic cable 56 applies the optical signal to a fiber optic detector 58.
  • the fiber optic detector 58 converts the optical signal from the switch 54 to a voltage for operating the assembly 38 of the pilot valve 36.
  • the fiber optic detector 58 outputs the electrical signal on conductors 60.
  • utilizing a piezo-electric element and the pilot valve 36 eliminates the opportunity for arcing due to electrical switch connection and disconnection. Only a minimal amount of electrical energy is needed to actuate the pilot valve 36, thus providing an intrinsically safe valve system. Further yet, because the receiver 28 and the assembly 38 only require a minimal amount of energy, the battery 32 provides substantial battery life for operating the valve system 10 over an extended period of time. With respect to Figure 2, the battery 32 may be eliminated because the optical signal provide sufficient voltage for operating the assembly 38.
  • FIG. 3 is a schematic block diagram of a valve switching system 70 that can replace certain switching devices of the valve systems 10 and 50, as will become apparent from the discussion herein.
  • the valve switching system 70 can replace the transmitter 14 and the receiver 28 in the system 10, and replace the optical switch 54 and the fiber optic detector 58 in the system 50.
  • the pilot valve 36, the main valve 44, the working element 16 and the fluid valve 18 would operate in the manner discussed above.
  • the system 70 includes a control board 72 that controls the piezo-electric element within the assembly 38.
  • the valve 18 is open or closed, depending on its normal position, by an optical signal from a light source 74.
  • the light source 74 can be any selectively activated light source suitable for the purposes described herein.
  • the optical signal generated by the light source 74 propagates down optical fibers 76 arranged in a fiber bundle 78. Light emitted from the ends of the fibers 76 opposite the source 74 is received by a plurality of solar cells 80 arranged in a cell bank 82.
  • the solar cells 80 convert the optical energy to an electrical signal that is provided on line 84.
  • the electrical signal on line 84 is amplified by a DC-DC converter circuit 86 to amplify the signal level suitable for a particular application.
  • the DC-DC converter circuit 86 amplifies the.signal level to 7.5 volts.
  • the converter circuit 86 is shown by way of a non-limiting example in that any amplifier circuit suitable for the purposes described herein can be used.
  • the amplified electrical signal on line 84 is then sent to the control board 72 that activates the piezo-electric element to switch the pilot valve 36 in the manner as discussed above.
  • the solar cells 80, the converter circuit 86 and the control board 72 could be internal to the assembly 38.
  • FIG. 4 is a schematic block diagram of a valve switching assembly 92 that is a variation of the switching assembly 70 discussed above.
  • the switching assembly 92 powers a control board 94 to control the piezo-electric element within the assembly 38.
  • a 1.2 volt signal is used to control the piezo-electric element.
  • the system 92 has particular application where a single light source powers many low voltage valve assemblies, and a separate low power optical signal is used to independently control each separate valve.
  • a light source 96 provides an optical signal on a plurality of optical fibers 98 and 100, where the optical fiber 98 powers the control board 94 and the fiber optical cable 100 powers another valve switching assembly (not shown).
  • the light source 76 can be any light source capable of providing optical signals to a plurality of switching assemblies consistent with the discussion herein.
  • the light source 76 controls two separate valve switching assemblies in this embodiment, but as will be appreciated by those skilled in the art, more optical fibers connected to the light source 96 can be provided to control more valve switching assemblies.
  • the light source 96 is maintained on so optical power is continually available to any of the several valve switching assemblies that may at any time require optical power.
  • the optical signal on the fiber cable 98 that is emitted from an end of the cable 98 opposite the source 90 is received by a plurality of solar cells 104 arranged in a solar cell bank 106.
  • the solar cells 104 convert the light energy to electrical energy available on line 108.
  • a photodiode 110 is positioned in the electrical line 108, and conducts when it receives an optical signal.
  • a fiber transmitter 112 such as an LED, is activated to provide an optical signal on a fiber optical cable 114.
  • the photodiode 110 receives the light from an end of the cable 114 opposite the transmitter 112, and conducts so that the electrical signal generated by the solar cells 104 activates the control board 94.
  • the control board 94 activates the piezo-electric element in the assembly 38 to control the pilot valve 36, as discussed above.
  • the solar cells 104, the photodiode 110 and the control board 94 can be internal to the assembly 38.
  • FIG. 5 shows a schematic block diagram of another valve switching system 120 for activating the valve 18 in the manner discussed herein.
  • the system 120 includes a control board 122 that operates with a 1.2 volt signal to activate the piezo-electric element in the assembly 38.
  • the switching system 120 includes an optical transmitter circuit 124 that includes a manual switch 126, a DC voltage source 128, for example a 9 volt DC source, and a fiber transmitter 130, such as an LED. When the switch 126 is closed, the voltage provided by the source 128 causes the transmitter 130 to transmit light down a fiber optic cable 132.
  • the system 120 further includes a switch assembly 136 including a DC voltage source 138, such as a 1.5 DC voltage source, and a photodiode 140.
  • a DC voltage source 138 such as a 1.5 DC voltage source
  • a photodiode 140 When the photodiode 140 receives light from an end of the optical cable 132 opposite the transmitter 130, it conducts which causes the DC voltage from the source 138 to energize the control board 122.
  • the control board 122 activates the piezo-electric element in the assembly 38 which controls the pilot valve 36.
  • the switch assembly 136 and the control board 122 can be internal to the assembly 38.
  • Figure 6 shows a schematic block diagram of a valve switching system 144 having a control board 146 that is the same as the control board 122, and a switch assembly 148 similar to the switch assembly 136.
  • the switch assembly 148 includes a DC voltage source 150 and an opto-coupler 152 that replaces the photodiode 140.
  • the opto-coupler 152 receives a low voltage signal from a suitable voltage source 154 that causes the opto-coupler 152 to conduct and energize the control board 146.
  • FIG. 7 is a schematic block diagram of a valve switching system 158 that includes a control board 160 that is the same as the control boards 122 and 146 above, and a switch assembly 162 that is similar to the switch assemblies 136 and 148.
  • the switch assembly 162 includes a DC voltage source 164, a capacitor 166 and an infrared source 168. A low voltage signal is applied to the infrared source 168 that causes the capacitor 166 to conduct which energizes the control board 160.

Claims (11)

  1. Système de soupape dans un système de gestion de produits chimiques pour contrôler l'écoulement d'un produit chimique volatile, comportant
       un transmetteur à distance (14), ledit transmetteur générant un signal d'activation de soupape (24);
       un récepteur (28), ledit récepteur générant un signal d'élément piézoélectrique en réponse au signal d'activation ;
       un assemblage comprenant un élément piézoélectrique (38), ledit assemblage générant un signal pilote en réponse au signal d'élément piézoélectrique ;
       une soupape pilote (36), ladite soupape pilote laissant passer une pression d'air pilote en réponse au signal pilote ;
       une soupape principale (44), ladite soupape principale générant une pression d'air de fonctionnement en réponse à la pression d'air pilote ;
       un opérateur pivotant pneumatique (16) sensible à la pression d'air de fonctionnement ; et
       une soupape d'écoulement de fluide (18) pour contrôler l'écoulement du produit chimique volatile depuis un premier côté (20) vers un second côté (22), ladite soupape d'écoulement de fluide étant déplacée par l'opérateur pivotant pneumatique.
  2. Système selon la revendication 1, caractérisé en ce que le récepteur (28) est une partie d'un circuit de commutation (92) qui comprend en outre une photodiode (110) et le transmetteur à distance est un transmetteur optique (112), ladite photodiode étant positionnée sur une ligne électrique (108) entre au moins une cellule solaire (104) et l'élément piézoélectrique (38), ladite photodiode étant sensible à un signal optique agissant comme signal d'activation de soupape provenant du transmetteur optique, ladite photodiode conduisant en réponse au signal optique pour permettre au signal de photodiode d'activer l'élément piézoélectrique (38).
  3. Système selon la revendication 1, caractérisé en ce que le transmetteur est un transmetteur RF (14), le signal d'activation de soupape est un signal RF (24) et le récepteur est un récepteur RF (28).
  4. Système selon la revendication 1, caractérisé en ce que le transmetteur à distance comprend un transmetteur optique (130), une source de tension continue (128), et un commutateur manuel (126), ledit commutateur manuel étant activé afin d'amener la source de tension continue à activer le transmetteur optique et à générer le signal d'activation de soupape.
  5. Système selon la revendication 1, caractérisé en ce que le transmetteur est un transmetteur optique (112), le signal d'activation est un signal optique, et le récepteur est un détecteur optique (110).
  6. Système selon la revendication 5, caractérisé en ce que le détecteur optique est sélectionné parmi le groupe constitué de photodiodes (110) et de cellules solaires (104).
  7. Système selon la revendication 5, caractérisé en ce que le transmetteur (112) est sélectionné parmi le groupe constitué de dispositifs infrarouges, dispositifs LED et sources lumineuses.
  8. Système selon la revendication 1, caractérisé en ce que le transmetteur est un circuit de transmetteur optique qui comprend un dispositif optique (152) et une source d'alimentation continue (150), ladite source d'alimentation continue délivrant le signal d'activation de soupape et ledit dispositif optique laissant passer le signal d'activation de soupape en réponse à un signal de transmetteur.
  9. Système selon la revendication 8, caractérisé en ce que le dispositif optique est une photodiode (110, 140) et le signal de transmetteur est un signal optique.
  10. Système selon la revendication 8, caractérisé en ce que le dispositif optique est un optocoupleur (152) et le signal de commutateur est un signal à basse tension.
  11. Système selon la revendication 8, caractérisé en ce que le dispositif optique est un dispositif infrarouge (168) et le signal de commutateur est un signal à basse tension.
EP01918848A 2000-03-21 2001-03-20 Robinet sans fil, a securite intrinseque Expired - Lifetime EP1266143B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US19106600P 2000-03-21 2000-03-21
US191066P 2000-03-21
PCT/US2001/008869 WO2001071198A2 (fr) 2000-03-21 2001-03-20 Robinet sans fil, a securite intrinseque

Publications (3)

Publication Number Publication Date
EP1266143A2 EP1266143A2 (fr) 2002-12-18
EP1266143B1 true EP1266143B1 (fr) 2005-08-24
EP1266143B2 EP1266143B2 (fr) 2010-01-20

Family

ID=22704000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01918848A Expired - Lifetime EP1266143B2 (fr) 2000-03-21 2001-03-20 Robinet sans fil, a securite intrinseque

Country Status (10)

Country Link
EP (1) EP1266143B2 (fr)
JP (1) JP4798922B2 (fr)
CN (1) CN1288355C (fr)
AU (1) AU2001245873A1 (fr)
BR (1) BR0102829B1 (fr)
CA (1) CA2356753C (fr)
DE (1) DE60112904T3 (fr)
ES (1) ES2247084T3 (fr)
MX (1) MXPA01007353A (fr)
WO (1) WO2001071198A2 (fr)

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
DE102006041601A1 (de) * 2006-09-05 2008-03-06 ITW Oberflächentechnik GmbH & Co. KG Steuereinrichtung eines Druckluftmotors, insbesondere in Kombination mit einer Pumpe und einer Sprühbeschichtungsanlage
US8814133B2 (en) * 2011-06-23 2014-08-26 General Equipment And Manufacturing Company, Inc. Automatic speed searching device and method for a partial stroke test of a control valve
DE102013007927B4 (de) * 2013-05-10 2014-12-24 Hoerbiger Automatisierungstechnik Holding Gmbh Antriebseinheit
GB201313804D0 (en) * 2013-08-01 2013-09-18 Moog Controls Ltd Improvements in hydraulic servovalves
JP6007922B2 (ja) 2014-01-07 2016-10-19 横河電機株式会社 接点信号変換装置
US9958880B2 (en) * 2015-09-16 2018-05-01 Fisher Controls International Llc Wireless valve actuator system and method
SE541705C2 (en) * 2016-10-10 2019-12-03 Aaloe Ab An implement and method for controlling the implement

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AT407432B (de) * 1998-03-18 2001-03-26 Hygrama Ag Piezoelektrisches ventil

Also Published As

Publication number Publication date
CA2356753C (fr) 2006-10-03
EP1266143A2 (fr) 2002-12-18
AU2001245873A1 (en) 2001-10-03
DE60112904D1 (de) 2005-09-29
WO2001071198A3 (fr) 2002-04-18
ES2247084T3 (es) 2006-03-01
MXPA01007353A (es) 2003-06-06
JP4798922B2 (ja) 2011-10-19
WO2001071198A2 (fr) 2001-09-27
BR0102829A (pt) 2002-04-23
DE60112904T3 (de) 2010-08-05
CN1288355C (zh) 2006-12-06
BR0102829B1 (pt) 2011-09-06
DE60112904T2 (de) 2006-06-08
CN1380948A (zh) 2002-11-20
JP2003528269A (ja) 2003-09-24
EP1266143B2 (fr) 2010-01-20
CA2356753A1 (fr) 2001-09-21

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