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
  • F16K31/0644—One-way valve
  • F16K31/0655—Lift 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
  • F16K39/00—Devices for relieving the pressure on the sealing faces
  • F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
  • F16K39/024—Devices for relieving the pressure on the sealing faces for lift valves using an auxiliary valve on the main valve

Definitions

• This invention relates to a device by an electromagnetic valve device for controlling a flow of fluid, in particular for use in ventilation plants and in industrial processes.
• adjustable choke valves are used to control a fluid flow, with the purpose of controlling physical parameters such as temperature, pressure and acidity (pH) in the system downstream.
• Such adjustable choke valves are normally driven by an electromotor with associated gears, or a hydraulic actuator. Both types of driving elements are expensive, and also require relatively complicated and expensive control equipment in order to deliver the necessary impulses to the electromotors or the hydraulic actuators in order to adjust the degree of opening of the valve.
• By low pressures and small dimensions it is also possible to utilize directly controlled electromagnetic valves.
• Norwegian patent NO172410 discloses a valve which is capable of opening to, and shutting off, a fluid flow also by somewhat higher pressures, without causing knocking in the pipes, to which it is connected, when closing.
• the perhaps most used method of controlling an amount of fluid for a period of time is to use an adjustable choke valve, in which the valve provides a desired flow rate by being adjusted to a position between closed and fully opened.
• Another method is pulse width modulation, whereby the control valve adopts either a fully closed or fully opened position.
• the amount of flowing fluid is deter- mined by for how much of the total time the valve is in its open position.
• the adjustable choke valve method has been applied in continuous processes, for example in temperature adjustment by means of flowing warm, alternatively cold, liquid, whereas the on/off-method has found its use within discontinuous processes, for example in the filling of a vessel.
• there is a certain overlapping there is a certain overlapping.
• the object of the invention is to remedy the negative aspects, for example high procurement costs, of known technique .
• the magnetic valve comprises, in addition to a conventional housing, a valve part which is arranged to be able to work fast, with a soft opening and closing characteristic, in addition to being able to open up a large flow area against a relatively high differential pressure by a considerably lower opening force as compared to known technique.
• the anchor of the electromagnet is provided with a choked drain groove in order to damp the valve further before its abutment in the fully opened position.
• Fig. 1 is a sectional view of an on/off-valve in its closed position
• Fig. 2 is a sectional view of an on/off-valve in its partially open position
• Fig. 3 is a sectional view of an on/off-valve in its fully opened position
• Fig. 4 is a sectional view of a control valve in its closed position
• Fig. 5 is a sectional view of a control valve in its fully opened position.
• the reference numeral 1 identifies a valve housing with two connection sockets 1' and 1" for the inlet and outlet of fluid.
• An arrow in the drawings indicates the direction of flow through the connection sockets 1' and 1".
• a seat plate 2 with a through opening 2a is fast with the housing 1.
• the centre line of the opening 2a is concentric with the valve axis 3.
• a lid 4 formed like an inverse cup is attached to the housing 1 and provided with a tight guide sleeve 5 which projects above the lid 4 and into a magnet coil 6.
• the magnet coil 6 is positioned concentri- cally about the guide sleeve 5 in a coil housing 7 with associated connection box 8.
• connection box 8 the coil housing 7 and the magnet coil 6 are secured to the lid 4 by sev- , eral screws 9 and an associated spacer 10, which is also arranged to cool the magnet coil 6 located within.
• a seal 11 seals between the housing 1 and the lid 4.
• the internal bore of the lid 4 and part of the adjacent cavity of the valve housing 1 form a damping chamber 4 ' .
• the valve is provided with an outer cylindrical valve body 12 and an inner cylindrical valve body 13.
• the outer valve body 12 is formed as a hollow body, in which a radial gable plate 12 ' is arranged to bear in a sealing manner on the seat plate 2 when the valve is in its closed position, covering the opening 2a at the same time.
• the gable plate 12' is provided with a centric opening 12a therethrough, whose function will be explained below.
• a cylindrical side wall 12" is provided with one or more through openings 12b, which are arranged to provide pressure equalization internally in the outer valve body 12.
• a lid 12"' with a through centre opening 12c is attached, for example by screwing, to the cylindrical side wall 12".
• a lower end surface 13' of the inner valve body 13 is arranged to bear sealingly on the gable plate 12 ' when the valve is in its closed position, while covering the opening 12a at the same time.
• the inner valve body 13 is provided with a chamfer/bevel edge 13", whose function will be described below, and at its opposite end portion it is provided with a fixedly connected connector 13"'.
• the connector 13"' is taken through the opening 12c and secured to an anchor 15 through a screwing 15 ' .
• a damping disc 14, whose function will be described below, is positioned concentrically round the connector 13"'.
• the anchor 15 is provided with a draining groove 15", which is formed with a reduced depth in its lower portion 15"', thereby being arranged to choke the fluid flow through the groove 15" against the internal wall of the guide sleeve 5 just before the anchor 15 reaches its upper end position.
• lid 4 and guide sleeve 5 are filled with fluid.
• the fluid is supplied through the connection socket 1' by pressure provided from, for example, a pump, not shown.
• a pressure difference across the seat plate 2 occurs because the valve bodies 12 and 13 shut off flow through the openings 2a and 12a.
• the portion of the force which acts on the inner valve body 13 is equal to the pressure difference across the valve mul- tiplied by the area of the opening 12a.
• the ratio of the closing force acting on the inner body 13 and the total closing force acting on the valve bodies 12 and 13, is determined by the ratio of the areas of the openings 2a and 12a.
• the diameter of the opening 12a is in the order of one fourth of the diameter of the opening 2a.
• the opening of the valve is carried out in two steps .
• An electric voltage is connected to the magnet coil 6.
• the magnetic forces generated, see Fig. 2 are sufficient for lifting the inner valve body 13 up from the gable plate 12', thereby opening to fluid flow through the opening 12a.
• the damping disc 14 is arranged to be displaced freely along the connector 13"' and is thus not moved in this phase of the opening. Fluid enters below the inner valve body 13 and the chamfer 13".
• the angle of the chamfer 13" relative to the end surface 13 ' causes a pressure increase to take place in the fluid below the chamfer 13", which contributes to lifting the inner valve body 13 further up from the gable plate 12 ' .
• the inner valve body 13 is displaced internally in the outer valve body 12 until it abuts the lid 12"'.
• the differential pressure between the two faces of the seat plate 2 is reduced, and the power from the magnet coil 6 will be sufficient to lift also the outer valve body 12 up from the seat plate 2. See Fig. 3.
• the opening 2a is uncovered and fluid may flow through.
• the damping disc 14, which is bearing on the lid 12"' is displaced through the surrounding fluid and damps the opening speed, in that fluid has to flow through the annular gap formed between the outer edge of the damping disc 14 and the damping chamber 1"', 4'.
• the fluid inside the guide sleeve 5 is displaced through the draining groove 15" when the anchor 15 is displaced into the guide sleeve 5.
• the depth of the draining groove 15" is gradually reduced to nil at the lower portion 15"' of the anchor 15, so that immediately be- fore the anchor 15 reaches its end position, wherein the valve is in its fully opened position, the fluid flow is shut off by the internal tubular surface of the guide sleeve 5 covering the entire draining groove 15".
• This configuration 5 is arranged to damp the speed of motion of the anchor 15, and thereby the valve bodies 12 and 13 when they reach their end positions in the fully opened position.
• valve is pro-
• the valve is arranged to adopt, by controlling the effect of the magnet coil 6 and thereby the magnetic field acting on the anchor 15, any position between the fully closed and fully opened positions.
• the damping disc 14 is arranged in this embodiment also to damp variations so that the fluid flow through the valve will be as even as possible.
• the area of the annular gap which is formed between the outer edge of the damping disc 14 and the damping chamber 1"', 4' can be adapted to the viscosity of the liquid in order to provide the best possible damping.
• valve according to the invention enables a considerable cost reduction in the installation and operation of a plant, in which conventional adjustable throttle valves would otherwise have to be used.

Landscapes

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

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19911171

Family Applications (1)

Country Status (4)

Cited By (2)

Citations (1)

Family Cites Families (1)

• 2000
  • 2000-05-22 NO NO20002623A patent/NO312114B1/no unknown
• 2001
  • 2001-05-16 EP EP01932424A patent/EP1325253A1/en not_active Withdrawn
  • 2001-05-16 AU AU2001258951A patent/AU2001258951A1/en not_active Abandoned
  • 2001-05-16 WO PCT/NO2001/000206 patent/WO2001090622A1/en not_active Application Discontinuation

Patent Citations (1)

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