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Publication numberUS3653393 A
Publication typeGrant
Publication dateApr 4, 1972
Filing dateMay 5, 1969
Priority dateMay 5, 1969
Publication numberUS 3653393 A, US 3653393A, US-A-3653393, US3653393 A, US3653393A
InventorsLove Addison N
Original AssigneeHarold Brown Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Timing valves and fluid controllers
US 3653393 A
Abstract
This invention relates to timing valves and to controllers using such timing valves for controlling the pressure fluid between a supply line and a utilization line servicing one or more pressure utilization devices with pressure signals of adjustable duration and frequency. The operation of a pair of complementary timing valves in the controller is synchronized by the pressure signals applied to the utilization line. One timing valve begins its predetermined delay period on the application of the pressure signal, while the other timing valve begins its delay period on the termination of the pressure signal. Each timing valve includes a time-calibrated variable orifice forming part of a timing chamber which includes fluid which is placed under pressure by a flexible diaphragm. A master control valve coupling the supply line to the utilization line is controlled by the successive displacements of the diaphragms.
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States'Patent [151 3,653,393

[451 A r.4,w72

[54] TIMING VALVES AND FLUID Primary ExaminerAlan Cohan @ONTROLLERS Attorney-R. Werlin [72] Inventor: Addison N. Love, Houston, Tex. 57 ABSTRACT Assignee: Harold B p y This invention relates to timing valves and to controllers using [22] Filed: May 5 1969 such timing valves for controlling the pressure fluid between a supply line and a utilization line servicing one or more pres- [21] Appl. No.: 821,745 sure utilization devices with pressure signals of adjustable duration and frequency. The operation of a pair of complemen- [52] U.S.Cl....'

137/102 137/624 1 4 tary timing valves in the controller is synchronized by the pres- [511 Int Cl F16k31/'l2 sure signals applied to the utilization line. One timing valve begins its predetermined delay period on the application of [58] Field of Search ..137/624.14, 102 the pressure signal, while the other timing valve begins its delay period on the termination of the pressure signal. Each [56] References timing valve includes a time-calibrated variable orifice form- UNITED STATES ATENTS ing part of a timing chamber which includes fluid which is placed under pressure by a flexible diaphragm. A master con- X trol valve coupling the supply line to the utilization line is controlled by the successive displacements of the diaphragms.

3,406,682 10/1968 Engstrom 3,530,890 9/1970 Bird v2,760,511 8/1956 Greeff ..137/624.14X

10 Claims, 5 Drawing Figures Patented April 4, I972 3,%53,393

4 Sheets-Sheet l I I I I I I I I I I I FIG.5

3 .4 TIME I I I l I I I I I I I I I I I I I I l I L 77 Addison N. Love INVEN TOR FIG? BY Michael F? Breston ATTORNE I IPaIented Arifl 4, 1972 4 Sheets-Sheet 2 IIIIIII IIIII I I IIII I I I II I I II I I I I I I I I II II III Addison IVA Love INVENTOR BY Michael PBresfon F/GZ A T TORNE V Patented April 4, 1972 mwaw 4 Sheets-Sheet 5 Addison N. Love INVENTOR FIG. 3 BY Michael F. Breston ATTORNEY Patented April 4, 1972 4 Sheets-$heet 4x Addison N. Love ./N VE N TOR 4 BY Michael F. Breston A T TORNEV TIMING VALVES AND FLUID CONTROLLERS BACKGROUND OF THE INVENTION Pressure fluid utilization devices such as valves, motors, pneumatically operated fog horns, etc., are typically operated or controlled by fluid controllers providing pressure fluid signals having time adjustable ON and OFF intervals. Such controllers for extracting from a supply source pressure signals are well known. Typically they employ timing mechanisms which are recycled by solenoids or fluid-controlled valves. Thus, an independent source of either electric power or pressure fluid must be provided to operate such controllers.

In some installations the lack of electricity, while in others a serious safety hazard, make the utilization of solenoid-controlled timing mechanisms undesirable. While fluid-controlled timing mechanisms are preferred for such installations, in the I past they have required independent pressure fluid control SUMMARY OF THE INVENTION Improved fluidoperated timing valves are provided for controlling pressure fluid between a supply line and a utilization line. A pair of such timing valves acting in a complementary manner are employed in a controller including a master control valve. The timing interval of one timing valve is initiated at the start of the pressure signal while the timing interval in the complementary valve is initiated at the end of the pressure signal. The valve spool in the master control valve is responsive to the resultant effect of the pressures in two pressure fluid lines. The pressure in each line is controlled by a timing valve.

Each of the pair of complementary timing valves includes a housing defining a timing chamber and a re-circulating chamber separated from each other by a flexible diaphragm. A timing spring when unrestrained urges the diaphragm to compress the fluid in the timing chamber. A time-calibrated variable orifice provides an outlet for the pressure fluid from the timing chamber to the re-circulating chamber. A control rod is coupled to the diaphragm and is movable therewith. F luid-operated means are coupled to the rod to periodically restrain the rod and hence the diaphragm.

In one timing valve the rod is restrained at the start and in the other valve the rod is restrained at the end of the pressure signal in the utilization line. By using a pair of such complementary fluid-operated, diaphragm-controlled timing valves, a fluid-operated utilization device can be provided with pressure signals of independently adjustable duration and frequency.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings illustrate preferred timing valves and pressure fluid controllers using such valves in accordance with this invention and wherein:

FIG. 1 is a more-or-less diagrammatic view of such a pressurefluid controller in one of its control positions when the pressure signal is OFF;

FIG. 2 shows the position of the controller immediately prior to the leading edge of the pressure signal;

FIG. 3 shows the position of the controller when the pressure signal is ON;

FIG. 4 shows the position of the controller. immediately prior to the trailing edge of the pressure signal; and

FIG. 5 is a pressure time diagram helpful in understanding the operation of the controller.

Referring now more particularly to the accompanying drawings, wherein like reference characters are applied to like parts throughout the views, there is shown a fluid controller generally designated as 10 in a housing 11. Controller I0 is adapted to continuously receive at an inlet port 12 pressure fluid and to periodically supply to an outlet port 14 pressure signals of adjustable duration and frequency. Inlet port 12 is connected to an inlet line 16, and outlet port I4 is connected to a utilization or signal line 18. Fluid communication between inlet line 16 and signal line 18 is governed by a master control valve, generally designated as 20. Valve 20 defines a passageway 22 which is either open or closed depending on the position of its spool valve 24 in a bore 25. Bore 25 is in fluid communication with two axially opposed control ports 27, 29 in the body 31 of valve 20. To control the displacement of spool 24 there are provided two fluid-operated timing valves.

One timing valve, generally designated as 26, is actuated by pressure fluid in a branch line 30. The other timing valve, generally designated as 28, is actuated by pressure fluid in a branch line 32. Both branch lines 30, 32 and signal line 18 are connected to a main line 34 which receives pressure fluid from the master valve 20 when passageway 22 is open.

The displacement of spool 24 in bore 25 is controlled by the combined effect of pressure fluid in lines 40 and 42, respectively coupled to control ports 27 and 29. Inlet line 16 is connected to line 40 through a pilot valve 44 and to line 42 through a pilot valve 44. Timing valve 28 provides a timed delay interval D on the application of pressure fluid through line 32, whereas timing valve 26 provides a timed delay inter val D on the removal of pressure fluid from line 30. At the end of interval D the pressure in line 40 is reduced causing the upper (as shown in the drawings) displacement of spool 24. At the end of interval D,, the pressure in line 42 is reduced thereby allowing spool 24 to move downwardly. When both lines 40 and 42 are under substantially equal pressure, the acting forces on spool 24 are balanced and spool 24 remains in the same position it assumed prior to both lines 40, 42 being under equal pressure. When spool 24 is in its upper position,

fluid passageway 22 is open to allow fluid pressure communication between inlet line 16 and main line 34.

The timing valves 26, 28 will now be described in greater detail. Valve 26 will hereinafter be referred to as the cycle timer since it controls the OFF-time of the pressure signal, and valve 28 will hereinafter be referred to as the signal timer since it controls the ON-time of the signal. Cycle timer 26 controls the displacement of a valve element 50, schematically represented by a triangle, in pilot valve 44. Valve element 50 is connected to an elongated stem 52 which extends outwardly of housing 54 of timer 26. Housing 54 defines a timing chamber 56, a recycling chamber 58, and includes a partition wall 60 having an upper face 62 and a lower face 64. Separating the timing chamber 56 from the recycling chamber 58 is a flexible diaphragm 66. The fluid from timing chamber 56 is allowed to vent out into the recycling chamber 58 through a time-calibrated orifice schematically represented as 68 contained in one or more dials (not shown). Fluid is allowed to enter the timing chamber 56 from therecycling chamber 58 through a suitable check valve 70.

The timing mechanism portion of timer 26, which includes the diaphragm, the timing and recycling chambers, the calibrated orifice and the check valve, forms no part of this invention and can be purchased commercially. One such timing device offers nine discrete ranges from 0.2 seconds to 60 minutes, adjustable by means of time-calibrated dials which control the opening of orifice 68.

A brief description of the operation of the conventional diaphragm-operated timing mechanism will now be given. A spring 69 is positioned between a center head 72, in the center of diaphragm 66, and the upper face 62 of wall 60. At the start of the timed interval D diaphragm 66 is pulled downwardly toward wall. :60, thereby allowing fluid to enter timing chamber 56 through check valve 70. Spring 69 exerts an inward force on diaphragm 66 thereby compressing the fluid in timing chamber 56. The fluid is allowed to vent out from timing chamber 56 to the recycle chamber 58 at a rate depending on the time-calibrated opening oforifice 68.

In accordance with this invention to the center head 72 is secured a control rod 74 extending outwardly through an opening 77 in end wall 76 of housing 54. Between the lower face 64 of partition wall 60 and end wall 76 is provided a double-diameter cylinder 80 slidably receiving therein a doublediameter piston 82 having an upper O-ring 84 and a lower ring 86 to define therebetween a fluid-tight control chamber 88 which communicates with line 30. Piston 82 has an axial bore 90 which extends from its upper face 92 to its lower face 94. Lower face 94 terminates a control finger 96 which may be integral part of the body of piston 82, as shown in cross-section. Piston 82 includes a downwardly directed cylindrical opening 100 housing a piston bias spring 102 resting against end wall 76 and against the bottom wall 104 in the cylindrical opening 100. Spring 102 normally urges piston 82 upwardly whereas pressure fluid in chamber 88 urges piston 82 downwardly against the force of spring 102.

Coupled to the free end of actuating rod 74 is an actuation mechanism generally designated as 106, which, in its simplest form, may include a horizontal (as shown in the drawings) lever arm 108 having a sufficient length so that it can lift stem 52 when actuating rod 74 is in its raised position. Movement of stem 52 unseats the pilot valve element 50 of the three-way pilot valve 44 thereby discontinuing or throttling down the pressure fluid communication between inlet line 16 and control line 40, while at the same time allowing the pressure in line 40 to exhaust through vent 107 around stem 52.

The signal timer 28 is in all respects similar to the cycle timer 26 except that in timer 28 the double-diameter piston is inverted and the force exerted by the piston bias spring is in an opposite direction. Therefore, to facilitate the understanding of the timers 26 and 28 like reference characters added with a prime have been applied to like parts in timer 28. The dif ference in the operation of timer 28 from that of timer 26 will become apparent from the description of the operation which follows. For the sake of completeness, normally connected to the input 12 of controller 10 is a pressure fluid source 120 supplying pressure fluid to input line 16 via suitable valves 122, 124. To the output 14 of controller 10 is connected a suitable utilization device such as a motor valve 126. Obviously any other utilization device may be connected to controller 10.

DESCRIPTION OF OPERATION In FIG. an arbitrary initial time instance was selected and designated as T The condition of controller at time T is shown in FIG. 1. Spool 24 is then at its lowermost position. Finger 96 is raised to allow spring 69 to initiate the time interval D Finger 96' is at its lowermost position to prevent spring 69' from exerting a force against diaphragm 66. As a result, lever 108 is disengaged from stem 52 and lever 108' is disengaged from stem 52'. Fluid communication between inlet line 16 and control lines 40 and 42 is established through the three-way pilot valves 44 and 44'. Since the same pressure fluid is in both lines 40, 42, spool 24 is not subjected to an unbalanced force and remains in its lowermost position thereby closing the fluid passageway 22 between inlet line 16 and main line 34.

Depending on the time set on the dial ofthe variable orifice 68, fluid from timing chamber 56 is allowed to vent out into the recycling chamber 58. The transfer of fluid from timing chamber 56 allows diaphragm 66 to move inwardly and actuating rod 74 to move upwardly.

At time T D diaphragm 66 has traveled from its extended position to its relaxed position, as shown in FIG. 2. Since operating rod 74 also traveled with diaphragm 66, lever arm 108 will engage stem 52 causing pilot valve element 50 to become unseated, thereby reducing pressure fluid communication between lines 16 and 40 and allowing the pressure fluid in line 40 to escape through vent 107. A reduction in pressure in line 40 causes an upward force to become exerted on spool 24 by the pressure fluid in line 42. At time T spool 24 will have shifted from its lowermost position to its uppermost position as shown in FIG. 3. The direction of the acting forces on the various parts are shown throughout the drawings by arrows.

When spool 24 is in its uppermost position, fluid communication is established between line 16 and main line 34 through the passageway 22 in the master control valve 20. As soon as pressure fluid is established in line 34 it is communicated through branch lines 30, 32 to the actuating chambers 88, 88, respectively, As a result, piston 82 moves downwardly and piston 82 moves upwardly.

Of course, pressure fluid in main line 34 provides pressure fluid to outlet 14 and hence to utilization device 126. Thus, at time T starts the leading edge of the pressure signal or pulse, subsequent to time interval D provided by cycle timer 26.

Since finger 96' is in its uppermost position, timing spring 69 is no longer restrained and is allowed to exert a force against the fluid in timing chamber 56. Just as with cycle timer 26, the operating rod 74' moves upwardly until lever 108 is allowed to engage the stem 52'. The lifting of the pilot valve element 50 produces at time T a reduction in the pressure in line 42, as shown in FIG. 4, and the ensuing downward displacement of spool 24 at time T thereby marking the trailing edge ofthe pressure signal or pulse 130.

The position of the controller 10 thereafter will be the same as shown in FIG. 1. The controller 10 is ready to start its operating cycle all over again.

The entrapped fluids in master control valve 20 are vented through vent 132. As will be seen from FIG. 5, time interval D T and time interval D T T What I claim is:

I. In a fluid controller having a fluid inlet and a fluid outlet, the inlet being connectable to a pressure fluid source, the outlet being connectable to a pressure fluid utilization device, the controller comprising:

a master control valve connected between said inlet and said outlet to provide to said outlet periodic pressure pulses, said master control valve having a first control port and a second control port,

a valve element responsive to the resultant pressure between said first and second control ports thereby generating said pressure pulses;

a first pilot control valve connected between said inlet and said first port;

a first fluid-operated timer intermittently closing the first pilot valve;

a second pilot control valve connected between said inlet and said second port;

a second fluid-operated timer intermittently closing the second pilot valve;

a first fluid line connecting said outlet to said first fluidoperated timer;

a second fluid line connecting said outlet to said second fluid-operated timer;

said first pilot valve being normally open to allow fluid communication between said inlet and said first control port and being closed after a predetermined first time interval subsequent to the application of pressure fluid from said inlet to said outlet; and

said second pilot valve being normally open to allow fluid communication between said inlet and said second control port and being closed after a predetermined second time interval subsequent to the removal of pressure fluid from said outlet; and

each ofsaid fluid-operated timers including:

a timing chamber,

a recycling chamber,

a flexible diaphragm separating said timing chamber from said recycling chamber,

atiming spring coupled to said diaphragm to urge said diaphragm in a direction to compress the fluid in said timing chamber when said spring is unrestrained, and

means including an adjustable orifice to allow the fluid from said timing chamber to flow into said recycling chamber.

2. The fluid controller of claim 1 and further including: a control rod attached to said diaphragm and movable therewith, Y

fluid actuatable means responsive to the pressure fluid in said outlet for periodically restraining said diaphragm spring, and

actuating means coupled to said rod for controlling the fluid flow through said pilot control valve.

3. The controller of claim 2 wherein,

said fluid actuatable means include a piston having a center bore for slidably receiving said rod,

a piston-bias spring normally urging said piston toward said timing chamber, and

said piston moving away from said timing chamber in response to applied fluid pressure.

4. The controller of claim 2 wherein,

said fluid actuatable means include a piston having a center bore for slidably receiving said rod,

a piston-bias spring normally urging said piston away from said timing chamber, and v said piston moving toward said timing chamber in response to applied pressure fluid. 5. A fluid controller including:

at least one master control valve comprising a body having a fluid inlet, a fluid outlet, and a valve element adapted to move when actuated to control fluid communication between said inlet and said outlet;

at chamber, one fluid-operated timer comprising a timing chamber, a recycling chambjer, a flexible diaphragm separating said timing chamber from said recycling chamber, timing means including an adjustable orifice to allow the fluid from said timing chamber to flow into said recycling chamber, and a control element coupled to said diaphragm and movable therewith;

actuating means coupled between the control element and said valve element for moving said valve element in response to the movement of said control element said master control valve defines a bore, and said valve element is a spool slidable in said bore.

7. The fluid controller of claim 6 wherein said restraining means are responsive to the fluid in said outlet.

8. A fluid controller including:

at least one master control valve comprising a body having a fluid inlet, a fluid outlet, and a valve element adapted to move when actuated to control fluid communication between said inlet and said outlet;

a first fluid-operated timer;

a second fluid-operated timer;

each of said first and second timers comprising a timing chamber, a recycling chamber, a flexible diaphragm separating said timing chamber from said recycling chamber, timing means including an adjustable orifice to allow the fluid from said timing chamber to flow into said recycling chamber, and a control element coupled to said diaphragm and movable therewith;

first actuating means coupled between the control element of said first timer and said valve element;

second actuating means coupled between the control elemerit of said second timer and said valve element;

said valve element being movable in response to the resultant effect produced by said first and second actuating means to provide to said outlet periodic fluid pulses; each timer including;

a timing spring coupled to the diaphragm to urge the diaphragm in a direction as to compress the fluid in said timing chamber when said spring is unrestrained, and

restraining means for periodically restraining the diaphragm spring.

9. The fluid controller of claim 8 wherein the body of said master control valve defines a bore, and said valve element is a spool slidable in said bore.

10. The fluid controller of claim 9 wherein said restraining means are responsive to the fluid in said outlet.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent- No I ,653,393 Dated April 4 1972 Inventor(s) ADDiSON N. LOVE 7 It is certified that'error appears in the aboveidentified patent and that said Letters Patent are hereby corrected as shown below:

Column 5, line 35, "chamber," should read least line 36, "chambjer" should read chamber Signedand sealed this'8th day of May 1975.

(SEAL) Attest:

, EDWARD M.FLETCHER,JR. ROBERT GOTTS CHALK Attesting Officer I Commissioner of Patents USCOMM-DC 60376-P69 u.s. GOVERNMENT PRINTING OFFICE: I969 o-3ss3:4.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2760511 *Mar 4, 1953Aug 28, 1956Du PontPneumatic cycle timer
US3406682 *Jan 26, 1965Oct 22, 1968Carl Gunnar Daniel EngstromRespirator, narcosis apparatus or the like having a delayed release safety valve
US3530890 *Dec 14, 1966Sep 29, 1970Bird F MVentilating apparatus
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4213457 *Dec 15, 1977Jul 22, 1980Robertshaw Controls CompanyIntermittent patient suction system and control means therefor
US4303072 *Mar 6, 1980Dec 1, 1981Robertshaw Controls CompanyIntermittent patient suction system and control means therefor
US4335835 *Jun 20, 1980Jun 22, 1982Anatros CorporationDevice for the intravenous or enteric infusion of liquids into the human body at a predetermined constant rate
US4462418 *Feb 25, 1982Jul 31, 1984The Al Xander Co., Inc.Unitized pneumatic cycling and timing system
US5125901 *Mar 4, 1991Jun 30, 1992Robertshaw Controls CompanyIntermittent patient suction system, self-contained control
US5257640 *Oct 18, 1991Nov 2, 1993Delajoud Pierre RFine pressure control system for high pressure gas
US5902267 *Aug 11, 1997May 11, 1999Medo; Elena M.Breast pump system using wall vacuum source
US7021909 *Jul 16, 2003Apr 4, 2006Trebor International, Inc.Oscillator for pneumatic pump having single valve
Classifications
U.S. Classification137/102, 137/624.14
International ClassificationF15B21/00, F15B21/12, F16K31/36, F16K31/365
Cooperative ClassificationF16K31/365, F15B21/12
European ClassificationF15B21/12, F16K31/365