WO2003100303A2 - Mesure de flux et systeme de commande pour pompes volumetriques - Google Patents

Mesure de flux et systeme de commande pour pompes volumetriques Download PDF

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Publication number
WO2003100303A2
WO2003100303A2 PCT/US2003/016574 US0316574W WO03100303A2 WO 2003100303 A2 WO2003100303 A2 WO 2003100303A2 US 0316574 W US0316574 W US 0316574W WO 03100303 A2 WO03100303 A2 WO 03100303A2
Authority
WO
WIPO (PCT)
Prior art keywords
check valve
poppet
pump
indicating
indicating check
Prior art date
Application number
PCT/US2003/016574
Other languages
English (en)
Other versions
WO2003100303A3 (fr
Inventor
George Jefferson Greene, Jr.
Original Assignee
Greene George Jefferson Jr
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 Greene George Jefferson Jr filed Critical Greene George Jefferson Jr
Priority to AU2003239888A priority Critical patent/AU2003239888A1/en
Publication of WO2003100303A2 publication Critical patent/WO2003100303A2/fr
Publication of WO2003100303A3 publication Critical patent/WO2003100303A3/fr

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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
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems
    • F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • 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
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/025—Check valves with guided rigid valve members the valve being loaded by a spring
    • 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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • 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
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • F16K37/0041—Electrical or magnetic means for measuring valve parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/09—Flow through the pump

Definitions

  • This invention relates to the process and oil industries and to chemical injection; in particular the device relates to positive displacement or diaphragm injection-type pumps providing a means for monitoring and controlling the output flow.
  • pump failures are caused by malfunctions of the suction or delivery check valve, packing leakage, mechanical drive failure, chemical supply blockage, electrical or gas interruption to the drive motor, or piping failures, just to name a few.
  • suction or delivery check valve packing leakage
  • mechanical drive failure mechanical drive failure
  • chemical supply blockage electrical or gas interruption to the drive motor
  • piping failures just to name a few.
  • Yoder et al. (U.S. Patent 6,135,719 and 6,135,724) disclose a more typical injection pump system.
  • a complex feedback control scheme is used to meter and monitor a series of chemical injection pumps by means of position control on the stroke control unit.
  • the present invention provides the missing link ("tell-tale") for the notification process that a positive displacement pump is, or is not, delivering fluid into the line.
  • the instant device is based about a simple differential pressure flow switch. It is known that a positive displacement pump is, in itself, a meter to measure delivery volume. Such a pump includes a plunger of a fixed diameter, a fixed stroke length and a constant stroking rate. Therefore, each stroke of the pump should deliver a fixed volume of liquid. Problems, such as check valve leakage, packing leakage, air leakage in suction piping, or partial blockage of the suction piping, can create a condition where partial, or no chemical delivery, even though the pump is mechanically operating, can occur.
  • the device makes it possible to determine what percentage of the fixed delivery stroke is actually delivering chemical, and the associated monitoring and control systems quantifies this percentage to the pumper.
  • the "tell-tale” device is a mechanical differential pressure switch specifically placed in the discharge line of the positive displacement pump that compares the pump discharge pressure with the pressure of the line into which chemical injection is desired. It is known that if a positive displacement pump is delivering fluid then the pressure within the pump must exceed the line pressure.
  • the actual mechanical device utilizes the discharge poppet (or check valve) in a positive displacement pump. If fluid is exiting the pump, then the poppet valve must lift: the instant device monitors the movement of outlet check valve (or poppet).
  • the device can be built into the pump or it may be a stand-alone valve added to the discharge port of the pump.
  • a standard discharge check valve is modified so that the mechanical motion of the valve may be monitored.
  • the standard poppet has a pin added to the valve. The pin is brought out of the valve body through a sealing means and the movement of the pin is monitored.
  • the associated flow control device is a variable volume chamber also connected to the discharge port of a positive displacement pump. The chamber volume may be varied from, essentially, zero to the same volume (or greater) that the pump is capable of delivering.
  • variable chamber is set at (or greater) than the volume of the pump chamber, then the discharge fluid is diverted into the variable chamber and no fluid is injected into the line.
  • Figure One is a cut-away illustration of the prototype mechanical indicating poppet (check) valve.
  • Figure Two is an isometric view of the preferred production mechanical indicating
  • FIG. 3 is a side view of the preferred production indicating check valve showing a completely assembled unit with a side mounted magnetic
  • Figure Four is a side view of the preferred production unit showing how the movement of the mechanical pin (poppet pin) is transferred to a side-mounted magnetic switch.
  • Figure Five is a top view of Figure Four.
  • Figure Six is a cut-a-way illustration of an alternate embodiment for the poppet seal.
  • Figure Seven is a system drawing showing the interconnection and interaction of the control and monitoring system. (Note the prototype mechanical limit switch shown on top of the indicating check valve.)
  • Figure Eight is a cut-away illustration of the variable volume chamber.
  • Figure Nine illustrates a mechanical indicating poppet (check) valve used directly within the body of a pump.
  • Figure Ten is a typical set of pump characteristics. Description of the Preferred Embodiment
  • a PD pump includes a plunger of a fixed diameter, a fixed stroke length, and a constant stroking rate. Therefore, each stroke of the pump should deliver a fixed volume of liquid.
  • Such problems as check valve leakage, packing leakage, air leakage in the suction piping, or partial blockage of the suction piping can create a condition of partial or no chemical delivery even though the pump is mechanically operating.
  • the instant device makes it possible to determine what percentage of the fixed delivery stroke is actually delivering chemical, and the associated control and monitoring system quantifies this percentage to the user.
  • the device, 1, used to determine the percentages of each delivery stroke of the pump is a simple mechanical differential pressure switch.
  • the pressure within the pump must exceed the pipeline pressure by a few pounds per square inch.
  • a sealing poppet, 13, which also serves as the discharge check valve is lifted a short distance (on the order of 0.040-inches or 0.010mm).
  • the check valve is acting as a differential pressure sensor - it will lift (or unseat) only when there is a positive differential pressure across the valve. This motion is transferred by the pin, 14, to a switch, mounted externally to the device.
  • the prototype uses an external mechanical switch, 2, mounted at the end of the plunger (see Figure 7); whereas the preferred device uses a standard off-the-shelf proximity switch, 20, mounted to the side of the unit. It is possible to use internal Hall- Effect type switches to sense the motion of the poppet thereby producing a sealed unit. The choices are up to the manufacturer.
  • the key to the invention is the use of the output check valve on a pump to sense positive differential pressure across the valve and using the mechanical motion of the check valve to provide an indication of positive differential pressure or flow out of the pump.
  • the switch, 20 or 2 in turn, starts a timer, which measures in milliseconds.
  • the poppet reseats, due to the suction phase of the cycle, and stops the timer.
  • the timer stops after each discharge stroke and the final duration of a fraction of a second reveals the percentage of the stroke that delivered liquid into the pipeline.
  • the timer is automatically reset to zero.
  • Figure 10 has been shown with a V -inch plunger at 35 strokes per minute, which was the system used in the prototype.
  • the remainder of table can be filled in by any person skilled in the art by careful measure of flow and timing.
  • the signal will sent over the telephone as a voice, which actually verbalizes the count once every 1.7 seconds.
  • variable chamber device, 6, (see Figure 8) connected directly into the pump chamber, which precedes the discharge check valve, 1, as shown in Figure 7.
  • the variable chamber device, 6, through a double floating piston, 65 and 66, and an adjustable stop screw, 64, allows a portion of the liquid on the discharge stroke to flow into the volume chamber until the floating piston, 66, is stopped by the adjustable screw, 64.
  • the adjustable screw, 64 is directly connected to a motorized controller, 7.
  • the chemical begins to exit the discharge check valve, 1, that activates the differential pressure flow switch, 2, (or if the production model is used 20) and the injection time is monitored by the timer.
  • a designated dial key is depressed and held.
  • a motor, 7, driving the adjustment screw moves the screw to a new position that the relative movement of the floating piston, 69, is changed.
  • the pump will announce the new flow rate back to the user or the pumper.
  • a SCADA system may remotely set the pump flow.
  • the volume adjustment motor, 7, is rotated forward or reverse by depressing a designated telephone key, for instance, depressing key "3" increases flow, depressing key "4" decreases flow.
  • the user or pumper would increase or decrease flow and monitor the flow rate. Once the desired flow is obtained the user would stop making the up/down adjustment.
  • a SCADA system would be similar.
  • a gas driven pump has a fixed plunger size and fixed stroke length but has a variable stroke time. Again, the basis for measuring the flow rate will rely upon the instant device with some differences in the flow rate calculation. It should be remembered that even if the electrical or gas-driven pump is operating it might be delivering partial or no chemical flow to the line.
  • the instant device is able to monitor the actual chemical delivery and immediately notify the pumper by telephone (or the SCADA network) if the delivery deviates between set limits or totally ceases to flow. At any time the pumper (or user) can remotely access the pump and instantly determine, or even change, the pumping rate.
  • the preferred embodiment for the indication check valve is shown in Figures 2 through 5, and the preferred embodiment for the variable volume chamber is shown in Figure 8.
  • the preferred indicating check valve production model
  • the top plate, 11, is screwed to the upper body, 12, and servers to hold the magnetic proximity switch, 20, the shim, 18, the shim alignment pins, 22a and 22b.
  • the poppet pin, 14, passes through and aperture, 24, in the top plate and through a corresponding aperture in the upper body, 34, thereby coming to rest against the shim, 18.
  • the shim is held in place by a shim screw or bolt, 19, which screws into a corresponding aperture in the top plate.
  • the two alignment pins (22) serve to keep the shim aligned over the proximity switch, 20, which screws into a corresponding aperture in the top plate. Naturally there would be corresponding alignment pin apertures bored in the top plate.
  • the top plate, 11, is secured to the upper body by securing bolt, 21, which passes through an aperture in top plate and into a bolt hole or aperture, 35, drilled in the upper body, 12.
  • a top plate alignment pin, 23, is located opposite the top plate securing bolt and on its underside. This pin passes into a corresponding aperture on the upper body, 33, and assures that the top plate and the upper body align and that the poppet pin, 14, can freely move through the associated apertures coming to rest on the underside of the shim, 18.
  • a cover, 10 screws onto the upper plate at threads 29 and protects all the (otherwise exposed) parts located on the upper plate. The cover 10 is placed on the unit after the top plate, 11, which is of necessity manufactured of aluminum, is attached to the upper body, 12. (Aluminum is required because magnetic sensing of poppet movement is employed - if another means were employed then the top plate could be manufactured from another material.)
  • the shim, 18, serves to translate the motion of the poppet pin, 14, over to the end of the proximity switch, 20.
  • the poppet and naturally the pin
  • This motion will be "amplified” by the shim (lever principal) and thus the movement of the poppet (going open) will be sensed by the proximity switch.
  • larger (or even smaller) motions of a mechanical check might occur and that that motion (or movement) will be determined by the size of the pump and output check valve.
  • the dimension given is for purposes of illustration only.
  • the upper body, 12 screws into the lower body, 17.
  • the lower body accepts the upper body and also the poppet assembly, 13.
  • the poppet assembly consists of a poppet (or valve), 16, a poppet pin, 14, which is secured into the valve, and a spring, 15.
  • This is a standard check valve BUT FOR the poppet pin, 14.
  • Associated with the valve are a spring lip, 41, and O-ring groove, 42, and an O-ring, 49.
  • the poppet pin is sealed by standard techniques, i.e., a Teflon washer, 45, and an O-ring, 46.
  • the sealing means is held in place by a spring washer, 47, against which the poppet spring, 15, rests when the complete device is fully assembled.
  • FIG. 6 shows an alternate seal system for the poppet wherein the O-ring/Groove seal is replaced with a ball and seal.
  • the O-ring and Groove, 49 and 42, is replaced with a ball, 43 and seat 44.
  • any reasonable seal means may be used with the poppet valve - the preferred ring and groove, the alternate ball and seat, or even a needle. It is possible to use other metal-to-metal seals and the inventor envisions the use of such alternates.
  • Figures 1 through 6 show embodiments of the indicating check valve manufactured as a separate assembly for installation on a pump. It should be apparent that the concept could be employed directly within the body of a pump as shown in Figure 9. In this case the standard outlet check valve is replaced with the instant device, 1. Like the preferred embodiment that uses a lower body (see item 17 in Figures 1 - 6), the device has an outer plug, 92 (identical to the upper body - item 12 in Figures 1 - 6) that screws into the pump body, 104.
  • the poppet assembly, 93 has a poppet indicating pin, 94, a poppet spring, 95, a poppet valve, 96, along with a sealing means (O-ring and groove, 91) and a seal, 97, where the poppet pin, 94, penetrates the outer plug, 92.
  • the outlet conduit or the outlet port on a pump may serve as the "lower" body for the instant device.
  • FIG. 9 Not shown in Figure 9 is an indicating switch means; however, a system similar to the preferred embodiment may be used.
  • a mechanical switch may be mounted directly over the indicating pin, 94. This is a simple design choice. The designer must remember that the indicating pin, 94, and switch should be protected from the elements, the chance of physical damage, etc. Again, simple design choices.
  • Identified in Figure 9 are stand pump parts, such as the inlet, 101, the inlet check valve, 100, the inlet check valve retaining nut, 105, and the pump piston, 103. The pump chamber is immediately above the pump piston.
  • the associated variable volume cylinder is shown in Figure 8, and, like the body parts (12 and 17), the wetted parts are made from stainless steel. However, operating conditions and chemicals may set a different requirement for wetted parts.
  • the cylinder consists of six basic parts. The cylinder liner, 73, the cylinder top, 60, the cylinder bottom, 62, the floating pistons, 65 and 66), the adjustment screw, 64, and the cylinder wall, 61, (which may be eliminated through careful manufacturing choices if the cylinder liner, 73, is bound between the cylinder top and bottom). Note, two floating pistons, 65 and 66 are shown and it is possible to use a single piston. The double piston arrangement is for operating safety and is not a limitation on the volume chamber.
  • the first piston, 65 is spring loaded by a spring, 67, and has at least one O-ring, 71, and associated O-ring groove, 69, and moves within the cylinder liner, 73.
  • the second piston, 66 is free to move within the cylinder liner, 73.
  • the second piston has an O-ring, 72, and associated O-ring groove, 70.
  • variable volume cylinder is attached to the outlet port of a pump via the inlet- outlet port, 63.
  • the device is shown, in Figure 7, connected in parallel with the indicating check valve, 1.
  • Fluid from the pump flows from the outlet to the check valve and the variable volume.
  • the fluid flows into the variable volume chamber until the piston(s) are stopped by the adjustment screw.
  • Fluid then flows into the check valve and when the pressure is sufficient the check valve lifts thereby allowing fluid to flow into the pipeline (or other equipment that is being protected).
  • the check valve closes and, since the pipeline pressure is now higher than the fluid pressure coming from the pump, the check valve remains closed and fluid flows from the volume chamber into the pump. On the next stroke the process is repeated.
  • the variable volume chamber sets the fluid flow from the pump.
  • variable volume cylinder is attached to motorized driver, 7, which drives the adjustment screw, 64.
  • the indicating check valve and the variable volume cylinder when associated with standard electronics will provide "tell-tale" indication of flow/no-flow and flow control.
  • the tell-tail indicating check valve may be connected directly to a delay circuit that makes certain the tell-tail operates each time within the pump stroke period. If the tell-tail fails to move, then the pump is not operating and an alarm would be sent to the user (pumper).
  • tell-tale There has been disclosed a system for monitoring flow (tell-tale) from a positive displacement pump and for controlling the volume of flow.
  • the tell-tale device may be used in two modes, 1) pure tell-tale - if the poppet does not lift within a reasonable time period and alarm will be generated, and 2) flow monitoring and alarm - the lift time is monitored, compared to a table (based on the pump) and output flow determined.
  • a volume control device has been disclosed thereby making a complete control and monitoring system.
  • the system may communicate remotely by telephone, SCADA or other communication system.
  • the prototype tell-tale device uses a mechanical switch, 2, whereas the industrial preferred device uses a proximity switch, 20, but all that is necessary a technique for determining the position (open/closed) of the poppet valve; thus, Hall-Effect devices, other proximity switches, pressure sensitive solid state devices, and the like all fall within the scope of this disclosure.
  • the sensing means for determining position may be incorporated within the upper body (12 of Figures 1 - 6 or 92 in Figure 9) of the indicating check valve, thereby eliminating the poppet pin and the seals. Such a concept is within this disclosure.
  • the preferred device has been described as a stand-alone unit; however, as disclosed, the indicating check valve may be directly incorporated into a pump body as a direct replacement for the standard outlet check valve. It is the intention of the inventor to claim this use of his indicating check valve as set out in the claims.
  • the device has been described for use with PD pumps, but will serve equally well with diaphragm pumps and other similar types of pumps. Hence the term pump as used in the claims should be broadly construed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)

Abstract

Cette invention concerne un système de surveillance de pompe et de commande de flux renseignant directement sur le flux de décharge de pompes volumétriques ou de pompes d'injection à membrane. Le dispositif comporte un clapet anti-retour 'témoin' qui déclenche un détecteur de proximité chaque fois que ledit clapet, qui fait office de soupape anti-retour de sortie sur une pompe d'injection classique, est ouvert par l'écoulement de décharge. Le détecteur de proximité envoie à son tour un signal au système de surveillance, la commande d'écoulement étant obtenue à l'aide d'une chambre à volume réglable montée en série avec le clapet anti-retour de sortie.
PCT/US2003/016574 2002-05-28 2003-05-27 Mesure de flux et systeme de commande pour pompes volumetriques WO2003100303A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003239888A AU2003239888A1 (en) 2002-05-28 2003-05-27 Flow measurement and control system for positive displacement pumps

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US38357202P 2002-05-28 2002-05-28
US60/383,572 2002-05-28

Publications (2)

Publication Number Publication Date
WO2003100303A2 true WO2003100303A2 (fr) 2003-12-04
WO2003100303A3 WO2003100303A3 (fr) 2004-04-01

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US (1) US20030223882A1 (fr)
AU (1) AU2003239888A1 (fr)
WO (1) WO2003100303A2 (fr)

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WO2010111322A1 (fr) * 2009-03-26 2010-09-30 Graco Minnesota Inc. Système de commande et de détection de pression multimode
EP2399521B1 (fr) * 2010-06-22 2013-03-06 General Electric Company Système de table de patient pour applications médicales et dispositif d'imagerie médicale associée
US9631620B2 (en) * 2011-03-11 2017-04-25 Johnson Controls Technology Company Stationary volume ratio adjustment mechanism
US20130287600A1 (en) * 2012-04-27 2013-10-31 Checkpoint Fluidic Systems International, Ltd. Direct Volume-Controlling Device (DVCD) for Reciprocating Positive-Displacement Pumps
CN102734511B (zh) * 2012-06-27 2014-01-08 中国海洋石油总公司 一种推芯控制阀
US9841015B2 (en) 2013-06-05 2017-12-12 Basf Se Arrangement and method for measuring a delivery volume and a delivery rate of an intermittently operating pump
US20150122354A1 (en) * 2013-11-01 2015-05-07 Ron Mills Automatically resettable pressure relief valve with manually resettable indicator system
US9982786B2 (en) * 2014-05-30 2018-05-29 Applied Materials, Inc. Valve with adjustable hard stop
FR3027648B1 (fr) * 2014-10-24 2017-10-13 Bayard Systeme de surveillance de distribution d'eau et dispositif de distribution d'eau associe
WO2016077751A1 (fr) * 2014-11-14 2016-05-19 Checkpoint Fluidic Systems International, Ltd. Mécanisme de pompe à diaphragme sandwich métallique
CN106247000B (zh) * 2016-08-09 2018-11-02 曲阜师范大学 一种可分析油井供液情况的单流阀及油井供液情况的分析方法
CN108331576B (zh) * 2018-02-05 2020-08-11 王艳霞 一种单向流量监测装置
CN112963590B (zh) * 2021-03-15 2022-11-15 中国长江电力股份有限公司 嵌入式快速截流单向阀套及方法
CN114352785B (zh) * 2021-12-04 2024-06-04 扬州高标机械有限公司 一种带预警功能的高压容器防爆阀

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US3667495A (en) * 1970-02-16 1972-06-06 Dopslaff Julius Kg Proportioning device, especially for water treatment systems
US3995658A (en) * 1974-06-12 1976-12-07 Societe Des Clapets T.J., Socla Non-return valve
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US5694117A (en) * 1994-06-13 1997-12-02 Sugarek; C. Alan Alarm system for rising stem valves
DE20105191U1 (de) * 2001-03-26 2002-05-02 Honeywell Ag, 63067 Offenbach Rückflußverhinderer

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US20030223882A1 (en) 2003-12-04
WO2003100303A3 (fr) 2004-04-01

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