FR2545903A1 - VALVE HAS TWO DEBITS - Google Patents

Abstract

THE INVENTION RELATES TO A TWO-FLOW VALVE. THIS VALVE INCLUDES A MAIN VALVE INCLUDING A BODY 10, AN INLET 11, AN OUTLET 12, A PORT 13 SURROUNDED BY A VALVE SEAT 14 AND A VALVE ELEMENT 20 CLOSING OR OPENING THIS VALVE, A PILOT VALVE INCLUDING A BODY 15, A INLET 27, AN OUTLET 28, AND A PORT 30 SURROUNDED BY A VALVE SEAT 31 AND A VALVE ELEMENT 35 CLOSING OR OPENING THIS VALVE, AND MEANS CONTROLLING THE VALVE ELEMENT 35 TO PREVENT A FLOW THROUGH THIS VALVE AND THROUGHOUT THE VALVE. 'ORIFICE 13 OR TO ALLOW MAXIMUM FLOW THROUGH THE VALVE AND INTO 13, OR OSCILLATION OF THE VALVE ELEMENT 35 TO ALLOW PARTIAL FLOW. APPLICATION IN PARTICULAR TO SELF-SERVICE FUEL PUMPS.

Description

The present invention relates to valves

  order to control the flow of liquids, and more particularly

  such a valve to obtain two flow rates

  as well as a complete stoppage of the flow.

  In some installations, such as

  systems for automatically delivering liquid

  of, significant amounts of liquid, but measured

  in a precise manner, must be delivered in a brief

  This type of equipment is, for example, equipment used in self-service petrol pumps. A customer pre-pays the price of a particular quantity of fuel and then operates the pump which has

  paid in order to deliver the exact amount paid.

  Typically, two separate valves are used in this operation: a large orifice valve for rapidly delivering most of the gasoline, and a smaller or "extra" orifice valve for

  to complete accurately the delivery of the quantity

  aunt The large flow valve is closed during operation.

  final filling procedure carried out by means of the

  If you use a valve with a large orifice, it would be very difficult to deliver the

  precise amount of liquid desired, and if one does not

  knows that a valve having a small orifice, the delivery

liquid will last too long.

  Although these two-valve devices

  are satisfactory, they are relatively expensive.

  Usually the valves are operated by solenoids.

  This is why, in addition to requiring two

  two electrical actuators must be provided.

  that to solenoid separated as well as associated cabling for

  two solenoids and pipes for both valves.

  An object of the present invention is to provide

  a single two-way valve, which can automatically deliver

  two flow rates and can therefore be installed in place of the two conventional high-flow valves and

low flow.

  Another object of the present invention is to

  provide a two-flow valve with two states of

  which is a state in which the valve is in a state of

  stable open position, and the other state in which the

  The valve is driven in oscillations so as to allow

  put only a limited flow through the valve.

  Another object of the invention is to provide a valve actuated by a single solenoid, which is excited by an AC energy, rectified in a half-wave rectification, so as to cause

  an oscillation of the valve element, and to which is applied

  alternating current to full wave or on

  two alternations so as to obtain the open sta-

ble of the valve.

  A further object of the present invention

  is to provide a two-way valve with two flow rates,

  When the pilot valve is fully open, the main valve opens to provide

  a large flow When the pilot valve element oscil-

  the, the main valve remains closed and it settles

  flow, at a low flow rate, only through the

pilot.

  This problem is solved according to the invention with the aid of a valve characterized in that it comprises: a) a main valve body having a

  main inlet port, a primary exit port

  cipal and a main orifice located between these orifices and surrounded by a main valve seat, b) a main valve element which can be

  brought in and out of contact with the main valve seat

  to form or open the main valve,

  (c) a pilot valve body incorporating a

  this pilot intake communicating with the intake port

  a pilot exit port communicating with the main exit port and a pilot port located between the pilot ports and surrounded by a pilot valve seat, d) a pilot valve member which can be brought into and out of contact with the pilot valve seat to close or open the pilot valve, and e) means for controlling the pilot valve member to: I hold the pilot valve member against the pilot valve seat to prevent flow through

  Val U Xpilote, in response to which the main valve element

  With the main valve seat to prevent flow through the main valve port, the pilot valve element should be held away from the pilot valve seat to allow maximum flow through the pilot valve, in response to what the main valve element disengages the orifice of the main valve, and

  III to oscillate the pilot valve element

  a direction toward and away from the pilot valve seat to permit partial flow through the pilot valve, from the main inlet port to the main outlet port, while main valve remains in contact

  with the main valve seat in order to prevent the

  through the orifice of the main valve.

  Other features and advantages of the pre-

  invention will emerge from the description given below.

  after referring to the accompanying drawings, in which: Figure 1 is a cross-sectional view of a pilot valve or slave according to the invention, in its fully closed state; Figure 2 is a cross-sectional view

  the valve in its fully open state;

  Figure 3 is a cross-sectional view

  of the valve showing the closed main valve and the valve

  pilot in his open vibratory state; Fig. 4 is a schematic drawing showing an electric circuit for exciting the solenoid of the pilot valve; and Figure 5 is a schematic drawing showing

  another circuit used to excite the solenoid of the

pilot.

  The valve chosen to illustrate this ln-

  vention comprises a valve body 10 having an opening

  this main inlet 11, a main outlet opening

  pal 12 and an orifice 13 located between these orifices and

  by a circular valve seat 14 A cover 15 is mounted on the body 10, the body and the cover being fixed

  together by bolts (not shown).

  The periphery of a flexible diaphragm 18 is sandwiched between the body 10 and the cover 15, and seals 19 are also provided to ensure a liquid seal between these elements A face

  bottom of the logging circle 8 is fixed an element of val-

  principal 20 that can be brought into contact with the

  valve 14 (see Figure 1) so as to close the main valve, and can be brought out of contact with this valve seat (Figure 2) so as to open the main valve A compression spring 21, disposed between the cover 15 and a support plate 22 carried by

  the upper surface of the diaphragm 18, permanently pushes back

  the diaphragm and the main valve element 20 into

  Valve seat direction 14 Hood 15 and the diaph-

  gme 18 define between them a room 23 This last

  re is permanently in communication with the access port

  main mission 11 through a purge port 24 defined by a washer extending through a

  hole in the diaphragm 18.

  The right side of the hood 15 (as shown in

  1-3) constitutes the body 15 'of a pilot valve The pilot valve body 15' has a

  pilot inlet port 27 communicating with the chamber

  23, a pilot output port 28 communicating with the main outlet port 12 through a hole 29 in the diaphragm 18, and an orifice

  pilot 30 located between the two pilot orifices and

  res by a pilot valve circular seat 31 In the

  15 'pilot valve body is screwed a cover 32 por-

  a tube 33 in which an armature 34 can slide longitudinally at its lower end, the armature

  34 carries a pilot valve elastic member 35

  to be brought into contact with the pilot valve seat 31 (FIG. 1) so as to close the pilot valve, and

  be brought out of contact with the valve seat 31 (

  2), so as to open the pilot valve. A compression spring 36 continuously pushes the armature 34 and therefore the valve member 35 towards the valve seat 31. The valve body 15 'and the hood 32 define between them a pilot valve chamber 37, which

  communicates continuously with Room 23 through

  mediate the intake port 27 of the pilot valve.

  A solenoid coil (not shown) in Figures 1-3, but indicated by reference 40 on

  Figures 4 and 5) surrounds the tube and is contained in a

  When the coil 40 is energized, the armature 34

  back in tube 33, against the strength of the

  fate 36, and contacts the fixed armature 42 located in the

  upper half of the tube (see Figure 2) In this state,

  the pilot valve is fully open When de-energizing

  of the solenoid coil, the spring 36 returns the

  34 in the position in which the valve member contacts the valve seat 31 (FIG. 1) so as to

close the pilot valve.

  In accordance with the present invention, the coil of the solenoid can be energized by two separate power supply sources, an example of which is shown in FIG. 4. Terminals 45 and 46 can be connected to a power source.

  electrical energy, such as a power source

  alternating current at 120 volts, 60 Hz A switching

  Mobile terminal 47 may alternatively be brought into contact with one or the other of two terminals 48 and 49. Terminal 48 is connected in series with coil 40 of the solenoid

  and terminal 46 Therefore, when the

  mutation 47 is in its full line position and

  At terminal 48, a full wave current on two halfwaves is applied to the coil 40, and the armature 34 is placed in a stable position by contacting the armature.

  42 Terminal 49 is connected in series with a diode

  the coil 40 and the terminal 46 therefore,

  that the switching member 47 is brought into its position represented by a mixed line and contacts the terminal 49,

  a rectified current according to a rectification on an alterna-

  nance is applied to the coil 40 This causes an oscillation

  the armature 34 causes its approximation and its spacing relative to the valve seat 31, the magnitude of the vibration displacement being provided by the distance 51

in Figure 3.

  We will now explain the operation of

  the valve It is assumed that the coil 40 of the solenoid is de-

  sexcited, that is, terminals 45 and 46 are disconnected

  from a source of energy supply, and that the

  The valve is in the state shown in FIG.

  the pressure of admission fills, from the opening

  this of admission 11, the chamber 23 through the

  bleed hole 24, and this fluid also fills the chamber

  37 through port 27 The force applied

  on the upper face of the diaphragm 18 under the action of the pressure of this fluid, in association with the action of the force of the spring 21, maintains the valve member

  20 against the seat 14 by closing the main valve

  The spring 36 bore the pilot valve member 35 against the seat 31 by closing the pilot valve. If now the terminals 45 and 46 are connected to an alternating current power source, by means of a switch (not shown) and if the switching member 47 contacts the terminal 48, a power in full wave or

  on two alternations is applied to the coil 40 of the solenoid

  The result is that the armature 34 goes up in the position

  shown in Figure 2 by opening the pilot valve

  The pressurized fluid within the pilot valve chamber 37 flows through the pilot valve orifice 28 towards the main outlet port 12. The pressurized fluid in the chamber 23 passes through the orifice of the chamber of the pilot valve 27 to enter the chamber 37, then through the orifice 28 towards the main outlet orifice 12. As a result, the pressure situated above the

  diaphragm 18 is relaxed and that pressure at the intake

  acting on the underside of the diaphragm and on

  the valve member 20 in the surface around the seat

  valve 14 causes a rise of the diaphragm and

  the valve element in the position shown in the figure.

  Figure 2, which causes the opening of the main valve.

  Although the high pressure fluid continues to enter the chamber 23 via the bleed hole 24, no pressure is established in this chamber.

  since the cross-sectional flow surfaces

  pilot ports 27 and 28 and the pilot orifice

  30 are greater than the flow area in terms of

  Thus, as long as the pilot valve remains in its stable open state (FIG. 2), the main valve remains open and the liquid passes through.

the valve at a fast speed.

  When the volume of the delivered liquid approaches

  of the desired quantity, the switching member 47

  is automatically moved from terminal 48 to terminal 49.

  As a result, the coil 40 of the solenoid is no longer energized with full-wave alternating-current power, but instead with current energy.

  alternation rectified on a simple alternation, being

  the diode 50 prevents alternation of

  The energy supplied on an alternation is not sufficient to maintain the armature 34 in the stable state shown in FIG.

  from this, the current sent on a simple alternation pro-

  void an oscillation of the armature, spreading and

  singing the latter of the valve seat 31, as shown in FIG.

  shown in Figure 3 The oscillation of the element of val-

  35, carried by the armature 34, in the region

  sine of the valve seat 31 allows a small amount of

  liquid to move from chamber 37 towards the ori-

  outlet 12 through the orifice 30 Ce-

  during, the flow of this flow is lower than

  when the pilot valve is fully open (Figure 2).

  In fact, the flow rate through the orifice 30, when the valve member 35 oscillates, is less than or approximately equal to the flow rate of the liquid admitted through the bleed hole 24 in the chamber 23. Therefore, it settles in the chamber 23 a fluid pressure which, in association with the force of the spring 21, moves the valve member to bring it into contact with the valve seat 14 by closing the main valve, and interrupts the high flow rate

  through the valve A flow of liquid continue.

  proceed through the valve, at a low flow rate, from the main inlet port 11 through the bleed hole 24, the chamber 23, the pilot inlet port 27, the pilot valve chamber 27 and the outlet port 28 of the pilot valve to the main outlet port 12 This low flow continues until the quantity

  prescribed liquid has been issued, in which case the

  applied to terminals 45 and 46 is automatically de-

  connected coil 40 of the solenoid is then completely

  de-energized and the pilot valve closes (Figure 1).

  Another circuit for energizing the solenoid coil is shown in FIG. 5 As terminals 45 and 46 of FIG. 4, terminals 45 'and 46' can be connected to a conventional AC power source. The terminal 45 'is connected in series with a diode 53, the coil 40 and a terminal 46' in parallel with the coil 40 are connected

  in the series circuit consisting of a diode 54 and a

  When power is applied to terminals 45 'and 46' and switch 55 is closed, a half-wave power is applied to coil 40; however, the current flowing through the coil 40 passes through the diode 54 and the valve is fully open (FIG.

  high flow The opening of the switch 55 causes the ap-

  the application of a single alternation energy to the

  40, which causes the armature 34 to oscillate

  Figure 3) and a low flow through the valve.

  Although in the example described above, the

  pilot of the piloted or slave valve oscillates

  To provide a reduced flow rate, the present invention

  should be applied to a single orifice valve, the armature

  solenoid actuating directly the main valve element

  In this case, when a full-wave or two-wave current is applied to the solenoid coil, the armature keeps the valve open in a stable state to provide the total flow. alternation is applied to the coil, the armature and therefore the valve element oscillate so as to allow only the passage of a smaller flow rate to

through the valve.

  The present invention has been shown and described.

  only in its preferred form and by way of example, and many modifications can be made without departing from the scope of the invention Therefore, it will be understood that the present invention is not

  limited to a specific form or embodiment.

Claims (10)

  Valve, characterized in that it comprises: a) a main valve body 46) comprising   a main inlet (11), a discharge port   head (12) and a main port (13) located   between these holes and surrounded by a main valve seat   cipal (14), b) a main valve element Q) which can be brought into and out of contact with the valve seat   (14) so as to close and open respectively   main valve, (c) a pilot valve body (15 ') having a   pilot inlet port (27) communicating with the ori-   this main inlet (11), a pilot outlet (28) communicating with the main outlet (12)   and a pilot orifice (30) located between said axial orifices   packaged and surrounded by a pilot valve seat (31), d) a pilot valve member (35) movable in and out of contact with the pilot valve seat (31)   to close and open respectively the pilot valve   and (e) means for controlling the pilot valve member (35) to: I. maintain the pilot valve member (35) against the pilot valve seat (31) to prevent through the pilot valve, in response to which the pilot valve member (35) contacts the pilot valve seat (31) to prevent flow through the main valve port (13),   It is necessary to maintain the pilot valve element (35)   pilot valve seat (31) so as to allow maximum flow through the pilot valve, in response   the main valve element (20) deviates from the original   fice of main valve (13), and III either to make oscillations the element of val   pilot (35) in a direction away from him and the   from the pilot valve seat (31) so as to allow   be a partial flow through the pilot valve, since   the main inlet (11) towards the ori-   the main valve member (20) remains in contact with the main valve seat (14) to prevent flow through the   orifice (13) of the main valve.   Valve according to Claim 1, characterized in that the control means (34, 40, 45-55, 45 ', 46')   the pilot valve member (35) is electrically energized.   Valve according to Claim 2, characterized in that the control means of the pilot valve element comprise two separate electric power supply sources (45-40), one of which (45, 46, 47, 481 has effect that the pilot valve member (31) takes a   stable position, in which the pilot valve is opened   te, and the other (45,46,47,49,50) has the effect that the element pilot valve (36) oscillates -   Valve according to Claim 2, characterized   in that the control means of the central valve element   include an electric solenoid (40), an armature   (34) displaceable in response to excitement and de-excitation   solenoid, and means (45-53) to excite   the solenoid so as to cause the alternating oscillation   of the armature (34) or to maintain it in a position   stable, in which the pilot valve is open.   Valve according to Claim 4, characterized   in that the pilot valve element (35) is carried by the duit (3 *).   6 valve according to claim 4, characterized in that the means for exciting the solenoid (40) comprise means (47) for alternately applying to the solenoid (40) an alternating current to   simple alternation or double alternation.   Valve, characterized in that it comprises:   a) a valve body (15 ') having an opening   this inlet (27), an outlet port (28) and an opening   fice (30) located between said holes and surrounded by a valve seat (31) b) a valve member (35) movable in and out of contact with the valve seat (31) for respectively removing and closing the valve , and   c) means for controlling the valence element   ve (35) for: I.susting the valve member (35) against the   valve seat (31) to prevent flow through   to the valve, II.is to hold the valve element (35) away from the   valve seat (31) to allow a maximum flow of   mum through the valve, and III be oscillating into the element of   valve (35) in a direction that brings it closer and   both of the valve seat (31) so as to allow a hearing   reduced flow through the valve.   Valve according to Claim 7, characterized in that the control means (34, 40, 45-55, 45 ', 46')   the valve member (35) is electrically energized.   Valve according to Claim 8, characterized   in that the control means of the valve element   two separate electrical power sources (4550), one of which (45,46,47,48) has the effect of   that the valve member (31) takes a steady position   ble, in which the valve is open, and the   (45,45,47,49,50) has the effect that the valve (36) oscillates.   OValve according to claim 8, characterized in that the control means of the valve element comprise an electric solenoid (40), an armature (34) displaceable in response to the excitation and the de-excitation of the solenoid, and means (45-53) for exciting   the solenoid so as to cause the alternating oscillation   of the armature (34) or to maintain it in a posi-   The valve according to claim 10, characterized in that the valve is open.   in that the valve element (35) is carried by the duit (34).   Valve according to claim 10, characterized   in that the means for exciting the solenoid (40)   include means (47) for alternately applying   solenoid (40) single-phase alternating current alternation or double alternation.