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
  • F16K31/00—Actuating devices; Operating means; Releasing devices
  • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
  • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
  • F16K31/0686—Braking, pressure equilibration, shock absorbing
  • F16K31/0693—Pressure equilibration of the armature
• • 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
  • F16K31/00—Actuating devices; Operating means; Releasing devices
  • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
  • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
  • F16K31/0644—One-way valve
  • F16K31/0655—Lift valves

Definitions

• the present invention relates to the field of solenoid valves, more particularly solenoid valves with direct command and most preferably the valves using balancing rods.
• direct command solenoid valves include either normally closed or normally open solenoid valves.
• the operative pressure is dependent from and proportional to the orifice area, so that in any case the attainable pressures are limited and determined by the orifice diameter (with the same coil power).
• the movement of the movable core corresponds to opening or closing an orifice. Therefore, if high flow rates are required, a large movement of the movable core and a broad orifice are required (since large movements correspond to large flow rates), thus it is necessary to provide for a large movement of the movable core, with consequent increase of the coil power and corresponding increase of the magnetic force. Therefore it is apparent that to have considerable flow rates, it is necessary to increase correspondingly the coil power, with consequent heavy economic burden.
• the maximum operative pressure of the solenoid valve is depending not only upon the orifice diameter, that is the fluid flow rate, but also upon the magnetic force that can be generated by the coil.
• Document WO 2004/113774 discloses a pressure control device comprising a first and a second valve member, the one normally closed and the other normally open, respectively, including passage orifices all with identical diameters in order to balance this valve group in any position. Said device cannot operate under alternate current and does not concern optimization of flow rates and performances, but has only the object of balancing precisely the pressures in any opening or closing stage of the group.
• the assembly constitutes substantially a three-way valve with complex components, while the pressure balance by gaskets disposed on stem 26 and 44 allows good performances, on the contrary the attainable flow rates are definitely reduced because of the small diameter of passages 50 and 48.
• the impossibility to operate under alternate current does not allow to meet the demand of a large portion of the market, due to lack of the phase displacement ring, together with the drilled duct 26 lightening the ferromagnetic material of the movable core 22, which in order to fall within the heating temperatures of the presently in force regulations, involves either a power reduction or an increase of the coil dimensions.
• Said solenoid valve may also be advantageously configured as either normally closed or normally open.
• An object of said prior disclosure was to make a direct command normally open solenoid valve, adapted to operate under both compression and traction. Moreover said valve is a direct command that may be used to control any kind of fluids such as liquids, gases, steam and even in any environment, such as the alimentary field, including also potentially explosive environments (when provided with a suitable protection cap).
• Said solenoid valve according to the above mentioned prior disclosure comprises a balancing rod and passages between chambers and discharge ducts not requiring now a detailed description, as they were already illustrated adequately in the above cited prior disclosure.
• an object of the present invention in to optimize the production cost of the innovative solenoid valve, briefly described hereinbefore.
• Another object of the present invention is to make a solenoid valve with balancing rod with high possibility of implementing numerous dimensions and flow rates, which can then be easily adapted to the installation requirements.
• Still an object of the present invention is to keep the advantages of the solenoid valve proposed in the preceding invention together with the reduction of costs of its variations.
• Another object of the present invention is to achieve an optimization of the variations and versatility of use for various types of applications of the solenoid valve according to the present invention.
• the normally closed or normally open direct command solenoid valve with balancing rod comprising a main body provided with a suction duct and a discharge duct for the fluid, a system consisting of movable core/fixed core/coil comprising a balancing rod and gaskets for sliding and sealing said balancing rod.
• the present invention advantageously describes a normally closed or normally open direct command solenoid valve, comprising at least a main body provided with at least a fluid suction duct and a fluid discharge duct, an orifice between said suction and discharge ducts, a shutter for said orifice, an elongated command member having a first end connected to said shutter, and again a further elongated balancing member having a first end connected to said shutter and a second end sealingly sliding in a passage made in said main body with axis parallel to the orifice axis, said command member being provided with an internal discharge channel to allow passage of said fluid and contain leakage.
• the discharge channels previously provided were removed from their preceding position, in a particularly advantageous and inventive way, thus allowing to reduce and transfer the number of components required to make the solenoid valve with balancing rod having the above mentioned advantages. More particularly, this ingenious modification allows to keep the advantages obtained by the previous invention considered as the closest prior art for the present invention.
• the provision of the discharge channel inside the movable core and balancing rod warrants in a substantially safe way, that the liquid flow does not leak out of said channel, so that this valve in a particularly advantageous way, may be used even in potentially explosive environments, without requiring addition of a special cap to hold possible leakage.
• Figs. 1a and 1 b are cross-sectional views of the prior art solenoid valve corresponding to the above mentioned previous invention of the same Applicant.
• Figs. 2a, 2b are exemplary cross-sectional views of a preferred embodiment of the innovative solenoid valve with balancing rod according to the present invention.
• Figs. 1a and 1 b show a preferred embodiment of the previous innovative solenoid valve with balancing rod of the same Applicant, wherein Fig. 1a is a cross-sectional view of a first preferred embodiment of a normally closed direct command solenoid valve shown in the condition of de-energized coil, i.e. of closure, and Fig. 1 b is a cross-sectional view of the solenoid valve of Fig. 1a shown in the condition of energized coil, i.e. open.
• a main body 10 provided with fluid inlet duct 12 and an outlet duct 14 in communication through an orifice 15 having an axis orthogonal to the axes of ducts 12 and 14.
• the main body 10 also comprises a first upper chamber 16 and a second lower chamber 18. These chambers may be connected with a sleeve 40 and a plug 50, respectively, through threaded couplings where seats are provided for gaskets 42 and 52, respectively. More particularly the lower chamber 18 is in communication with the outlet duct 14 through a hole 17, while the upper chamber 16 is provided with a sealing member 20 fixed by interference fit. An outer gasket 26 is interposed between the outer wall of sealing member 20 and the inner wall of body 10.
• chamber 16 is divided by said sealing member 20 in a first zone 16a including orifice 15 and a second zone 16b facing the sleeve 40.
• member 20 has a central hole 21 and a hollow disc 22.
• a movable core 38 sliding in sleeve 40 is arranged so as to pass through said hole 21 and said disc 22; a gasket 24 is disposed under disc 22 so as to be permanently in contact with the movable core 38.
• the upper end of this core has a seat for a spring, in its turn in contact with a fixed core 46 fastened on top of sleeve 40. Said sleeve is then inserted in a coil 44 so as to be influenced by the magnetic field generated by the coil on the basis of external signals.
• the lower end of the movable core 38 may be coupled, through threads or other fastening means, with the upper end of a balancing rod 32: a hollow shutter 30 is interposed between the lower end of movable core 38 and the upper end of the balancing rod 32 and remains clamped therebetween by screwing said ends.
• the lower end of the balancing rod 32 is so dimensioned as to slidingly close the lower hole 17: a hollow disc 34 and a gasket 36 assure that the flow does not flood directly chamber 18 thus aiding the pressure balance of rod 32 with the movable core 38, and at the same time allow the lower end of the balancing rod 32 to slide.
• Upper 11 and lower 13 discharge channels are also made in the main body 10 in order to communicate chamber 16 and chamber 18, respectively, with the discharge duct 14.
• such a valve may be either normally closed or normally open, and this is a very advantageous characteristic which is an object of the present invention, as well as the operation with different modes of feeding voltage, but in a still more advantageous and inventive way, as above said, the present invention has and fulfils the object of solving the problems widely discussed above of said solenoid valve with balancing rod.
• FIG. 2 is a cross-sectional view of a first preferred embodiment of a normally closed direct command solenoid valve 100 in the condition of de-energized coil
• Fig. 2b is a cross-sectional view of the solenoid valve of Fig. 2a in the condition of energized coil
• the gasket or O-ring 24 and the relevant seat are arranged differently on the sleeve 40, so for sake of clarity said O-ring or gasket will be referenced as 24', thus allowing to eliminate the sealing member 20, gasket 26 and disc 22.
• the discharge channels 11 and 13 are no more present. It is to be noted that, although they were useful for accomplishing the above mentioned innovative technical advantages, said channels 11 , 13 involved the presence of gaskets, disc and sealing members, causing the above cited technical drawbacks that should be removed by the present invention.
• the solenoid valve 100 implemented according to the present invention may be easily adapted in the implementation stage to the customer's requirements and may be made according to specific needs without particular limitations.
• said solenoid valve with balancing rod combines the advantages of normal solenoid valves with cover for explosive environments and those of equal safety but little dimensions of this solenoid valve with innovative balancing rod.
• the balancing rod and the core may not be provided with holes, with relevant further reduction of costs, the same components sealing members 20, outer gasket 26 and hollow disc 22 are eliminated, but a discharge channel in the movable core and balancing rod is not provided; in this way there is still the advantage of reduction of components, but there is a risk of leakage of the contained liquid, so that this simplified solution is adapted only for non explosive environments, when a further reduction of costs is required.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Magnetically Actuated Valves (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (2)

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Citations (2)

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• 2015
  • 2015-08-03 WO PCT/IB2015/001326 patent/WO2016020745A1/en active Application Filing
  • 2015-08-03 EP EP15767238.7A patent/EP3191753A1/de not_active Withdrawn

Patent Citations (2)

Non-Patent Citations (1)

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