US2688337A

US2688337A - Delay action valve

Info

Publication number: US2688337A
Application number: US185710A
Authority: US
Inventors: Paul F Shivers
Original assignee: Honeywell Inc
Current assignee: Honeywell Inc
Priority date: 1950-09-20
Filing date: 1950-09-20
Publication date: 1954-09-07
Anticipated expiration: 1971-09-07

Description

DELAY ACTION VALVE Filed Sept. 20, 1950 35 FROM on. SUPPLY INVENTOR. PAUL F. SHIVE RS ATTORNEY.

Patented Sept. 7, 1954 UNITED STATES ATEN'P OFFICE,

Claims. (Cl. 137-494) This invention relates to delay action valves and, more specifically, to a delay action oil valve for use in oil burner apparatus wherein a primary air fan and an oil pump are operated by the same motor.

In oil burner installations of the above mentioned type, it is desirable to delay the delivery of oil to the burner until after the fan has come up to speed. This is to assure that there is plenty of oxygen to give complete combustion of the oil as it enters the furnace and thus prevent smoking thereof and the depositing of carbon in the furnace combustion chamber. It is also desir-..

able that, when the oil is delivered to the furnace, the delivery will be quick, so as to give proper atomization of the oil at the nozzle, without voil dripping therefrom. Also, it is advantageous to have quick shut-off of oil at the nozzle, for the same reason.

It is an object of this invention to provide .a valve that provides delayed delivery of oil fol.- lowing the starting of the fuel pump and that provides quick delivery and shut-off of the .oil to the burner at predetermined desirable pressures.

Another object of the invention is to provide a simple, reliable, and compact valve that will accomplish the above mentioned results.

Another object of the invention is to provide a delay action valve havin a normally open bypass therein which is controlled by the main oil valve to control the timing of the delay period and to assure quick cut-off ofthe' oil delivery upon deenerg-ization of the motor which operates the fuel pump.

A further object of the invention is to provide a delay action oil valve wherein a bypass valve is operated by the main fuel valve by means of slip friction means extending between said valves.

A still further object of the invention is to provide a delay action valve wherein two bypass passages are provided and the rate of discharge through each is adjustably regulated by a single manually operated valve.

Still another object of the invention is to pee vide a valve having means for delaying the delivery of oil therefrom following a delivery of oil thereto, which also has means for regulating the pressure of the oil delivered thereby.

Still other objects of the invention will become apparent upon reading the following detailed description of the invention in conjunction with the accompanying drawing.

A single figure of the drawing is a schematic showin of the delay action valve in cross-section the rod 28 is lifted, as by the and a room thermostat, transformer, burner, fan. motor and pump.

A valve body m has a bore or cylinder ll formed in the upper end thereof. Said end is closed by a threaded plug 12. An inlet passage l3 extends from the exterior of the body to a two way valve chamber 14. A first bypass pas-j sage it extends from the bottom of the chamber M tothe bottom of the valve body it. A passage if; extends from the top of the valve chamber 14 and joins a branch passage IT to the bottom of the bore M and a second branch passage I8: t0 the bottom of a bore l9 extending coaxially down-J Wardl-y from the bottom of the bore or cylinder I I. A second bypass passage 20' extends from the side of the bore 19 nearthe bottom thereof to a common return passage 2] extending through a wall of the valve body I!) for substantially the? full length thereof. An outlet passage 22 extends through a side wan" of the valve body from a point substantially equidistant from the ends of the here or cylinder I l. A first branch return passage 23 extends from the cylinder II to the common. return passage 21 from a point in the cylinder spaced slightly above the outlet passage 22, as viewed in the. figure of the drawing. A second branch return passage 24 extends from apoint near the upper end of the cylinder l lto the upper end of the common return passage 2|.

A pistonvalve 25, made of rubber or a synthetic material, has a cup-shaped backing washer 25 and is positioned Within the cylinder II. It is biased toward its rest position at the bottom of saidcylinder by means of a spring 21. A rod 28' extends into a guide bore l2a in the plug I2 and extends through centrally disposed-bores 25d and 25a in the washer 26 and valve 25*, respec-: tively, and into the bore H3. The bore 25a is of such size that a small amount of force is necessary to slide the valve 25 along said rod 28, due to the frictional engagement of the surfaces thereof. A ball checkevalve 29' rests on the bot-' tom of the bore 19 and is normally engaged by the lower endof the rod 28 when the valve 25' is in its lowermost position. The biasing means (spring 2-?) for returning the piston to rest position must be so designed that the extended poe sitionleaves the spring with only enough residual tensionto safely return the piston to itsrest position. This is necessary .so that only a small initial pressure from the pump will start the piston moving and thus close the ball check bypass, permitting fuelpressure to build up. When raising of the valve 25 when oil is being delivered to the valve, the ball it will be lifted into sealing engagement 3 with the left-hand end of the passage 28 to prevent a flow of oil through passage 28. To provide for the escape of oil from the upper end of bore l2a, a longitudinally extending groove 28a is provided in the circumferential surface of the upper end of the rod 28.

To provide for the bypassing of some of the oil delivered by the pump, when the delivery of said pump is far in excess of that used by the burner, a manually adjustable two-way valve 38 in valve chamber [4 is adjustable toward and away from the lower end of passage i6 and the upper end of passage I by means of a stem 3|. The stem 3| has a threaded lower end with an adjusting knob 32 thereon. An internally and externally threaded plug 33 screwthreadedly receives the stem 3| and is threaded into the valve body l I so as to clamp packingmaterial 34 sealingly around the stem 3|.

A pipeline 35 extends from a source of oil supply to the pump 35 and from the pump to the inlet E3 of the valve. The bypass passage I5 is connected to the supply pipe 35 by means of pipe 31 while the common return 2| is connected to the supply pipe by means of the pipe 38. The outlet 22 of the valve is connected to the nozzle (not shown) of the burner 48 by a pipe 39.

A pipe 2-2 extends from a fan 4| to the burner 48 to deliver air to support combustion of the oil. A shaft 43 of a motor 44 drives both the pump and the fan.

For the sake of simplicity, the only control device for the motor is shown to be a room thermostat 45 that makes and breaks the circuit from the secondary 45 of a conventional transformer 41 by means of

lines

48 and 49 leading to the motor and line 58 leading from the room thermostat to the transformer secondary.

Operation The apparatus is shown in a shut-down condition. That is, the room thermostat has its contacts separated and the valve 25 is below the outlet 22. Upon a call for-heat, the room thermostat 45 will close its contacts and cause energization of the motor. The fan and pump will be simultaneously operated to deliver air to the burner through pipe 42 and oil to the delay action valve through pipe 35. Part of the oil delivered to the valve it will be bypassed through passage l5 to the line 35 and back to the pump, while the remainder of the oil delivered by the pump will pass through passage IS, with some of this oil going around ball valve 29 and through bypass 20, pipe 38 and line 35 to the inlet side of the pump, with the remainder of this portion of the oil going through passage [1 to the underside of the valve 25. Pressure will build up under the piston valve 25 and will cause a lifting of the rod 28 and said piston valve at a slow rate but, due to the short travel necessary for the rod 28 to free the ball 29, the ball will be permitted to rise to the broken line position shown in the drawing. Therefore, the sealing oil of the bypass passage 28 by the ball valve will take place fairly soon after the pump starts operating. l he closing of the bypass 28 permits the full oil flow through the passage It to go to the lower portion of cylinder l l and increase the rate of rise of the piston valve 25. However, due to the large size of the cylinder, a predetermined length of time will be required before the lower edge of the valve 25 uncovers the outlet passage 22 to cause delivery of oil to the burner.

It will be noted that the rod 28 will lift only slightly above the ball 29 in its seating position over the inner end of passage 20, due to the fact that the upper end of the rod engages the upper end of bore lZa, thus stopping the upward movement of the rod 28. As indicated above, the piston valve 25 is free to slide on the rod 28 when a sufficient amount of pressure, such as that developed by the pump, is acting on the piston tending to so move it along the rod. It is thus seen that after the upward movement of the rod 28 is stopped, the piston valve 25 will continue to move on up to a position uncovering the outlet 22 and possibly above said point to a position uncovering a portion of the return passage 23 which serves as a pressure relief port. The return passage 24 enables the fluid above the backing Washer 26 to enter and to escape from the cylinder I I through said passage 24, passage 2| and pipe 38 to the low pressure supply pipe 35 as the piston moves upwardly. It will be noted that oil will not be delivered to the burner until it has reached a pressure determined by the loading of the spring 21 when the lower end of the piston valve 25 uncovers the passage outlet 22. It will also be noted that this delivery pressure Will be substantially maintained due to the fact that any appreciable increase therein will be relieved through the bleed or pressure relief return passage 23.

When the room temperature has reached the desired amount, the room thermostat contacts will break causing deenergization of the motor and the stopping of the fan and pump. The frictional force necessary to move the piston valve 25 on the rod 28 is sufiiciently greater than that necessary to move the ball valve 28 out of its seating position over the inner end of passage 20, that the first part of the return movement of the valve 25 will cause the unseating of the ball valve 29 and will increase the rate at which oil may be expelled from underneath the valve 25 under the action of spring 21, so as to give quick closing of the outlet 22. During the further return movement of the valve 25 to its normal position, the valve 25 again slides on the rod 28, after the rod 28 has moved to its normal position as shown in the drawing.

It is to be understood that the delay action valve illustrated in the drawing is subject to many structural changes for manufacturing and assembly purposes, without departing from the spirit of the invention. It is therefore to be expressly understood that the scope of the invention is to be determined solely from the appended claims.

I claim:

1. A valve comprising a hollow body, an inlet passage, an outlet passage spaced from said inlet passage, a return passage on the opposite side of said outlet passage from said inlet passage, pressure operable valving means in said body cooperable with said outlet and return passages to control fluid flow therethrough, means biasing said pressure operated means toward the inlet end of said body, a bypass passage between said inlet passage and the exterior of said body, a first bypass valve in said bypass passage, slip-friction means including a rod frictionally engaged by said pressure operable means for normally holding said bypass valve open and for releasing said bypass valve to enable it to close upon initial movement of said pressure operable means toward said outlet passage and for opening said bypass valve upon initial return movement of said pressure operable means, and a second manually adjustable bypass valve in said inlet passage.

2. A valve comprising a hollow body, an inlet passage, ,an :outlet passage spaced from said :inlet passage, a return passage on the opposite side of said outlet'passage from said inlet-passage, a piston Valve in said body cooperable with said outlet and return passages to control fluid flow therethrough, means biasing saidpiston valve toward thein'let end of said body, a bypass passage between said inlet passage and the exterior of .said body, :a bypass valve in said bypass passage, and slip-friction means actuated by said piston :for normally holding said bypass valve open and "for releasing said bypass valve upon initial movement of the piston valve "toward said outlet passage and for opening said bypass valve upon initial-return movement of the piston valve, said slip-friction means comprising a rod frictionally slidable through a hole in said piston valve and engageable with said bypass valve.

3. A delay action pressure operable valve comprising a cylinder, an inlet at one end of said cylinder and an outlet intermediate its ends, a return passage extending from the interior of said cylinder from a point between said outlet and the other end of said cylinder to the exterior of said cylinder, a bypass extending from said inlet to Said return passage, a valve for controlling fluid flow through said bypass, and a piston valve movable in said cylinder and cooperable with said outlet and return passage for first controlling the closing of said bypass valve and then opening said outlet, said piston valve carrying a slip-friction means including a member frictionally held by said piston valve and so associated with said bypass valve that said valve is opened upon the initial return movement of said piston valve.

4. A delay action valve comprising a cylinder, an inlet at one end of said cylinder and an outlet intermediate its ends, a return passage extending from the interior of said cylinder between said outlet and the other end of said cylinder to the exterior of said cylinder, a bypass extending from said inlet to said return passage, a valve for controlling fluid flow through said bypass, pressure responsive means movable in said cylinder and cooperable with said outlet and return passage for controlling fluid-flow therethrough, and slipfriction means including a member frictionally engaged by and operable by said pressure responsive means for first controlling the closing of said bypass valve, said pressure responsive means then opening said outlet, said member being so associated with said bypass valve that said valve is opened upon the initial return movement of said pressure responsive means.

5. A valve comprising a hollow body, an inlet passage, an outlet passage spaced from said inlet passage, a return passage on the opposite side of said outlet passage from said inlet passage, a piston valve in said body cooperable with said outlet and return passage to control fiuid flow therethrough, biasing means resiliently forcing said piston valve toward the inlet end of said body, the force of said biasing means being substantially expended when said piston valve is at said inlet end, a bypass passage between said inlet passage and the exterior of said body, a bypass valve in said bypass passage operable by fluid fiow to a closed position in said passage, slipfriction means comprising a rod frictionally engaged by said piston valve, said rod being actuable by said piston valve for normally holding said bypass valve open and for releasing said bypass valve to move to closed position upon initial movement of the piston valve toward said outlet passage and for opening said valve upon initial return :movementof the piston valve.

B. A valve comprising -a hollow body, an inlet passage near one end of said body, an outlet passagespaced from said inlet passage near the other endsof said body, :a return passage on the opposite side of said loutlet passage from said inlet passage, a main "valve .in said body cooperab'le with said outlet .and return passages to control fluid fiowitherethrough, means biasing said main valve toward the inlet end of :said .body, a bypass passage abetween :said inlet passage and the exterior of .said body, a bypass valve in .said bypass passage, slip friction means comprising a slidabl'e connecting member .sli'dable with respect to said main valve and operable by said main valve :for normally holding said bypass valve open and for releasing said bypass valve upon initial movement of the main valve toward said outlet passage and for opening said bypass valve upon initial return movement of the main valve.

7. A delay action valve for delaying the flow of fuel to a burner comprising, a cylinder, a rod disposed lengthwise in said cylinder, a piston contained in said cylinder, friction clutching means connecting said piston and said rod so that upon the initial movement of said piston in either direction said rod is moved, an inlet passage in the lower end of said cylinder, an outlet passage connected to said cylinder intermediate its ends, a return passage extending from the interior of said cylinder between said outlet and the upper end of said cylinder to the exterior of said cylinder, a bypass including a valve connecting said inlet and said return passage, and means including said rod for operating said bypass valve upon the initial motion of said piston in either one direction or the other.

8. A fluid control valve, comprising a cylinder having an inlet at one end and an outlet intermediate its ends, a piston valve contained in said cylinder and normally biased to the end having said inlet, a return passage extending from the interior of said cylinder between said outlet and the other end of said cylinder to the exterior of said cylinder, bypass means including a valve connecting said inlet and said return passage, bypass valve actuating means including a member frictionally engaged by said piston valve so that the initial movement of said piston valve in one direction or the other actuates said bypass valve, and a relief passage connected to said cylinder intermediate its ends and to the side of said outlet remote from said inlet so that movement of said piston valve beyond that required to open said outlet will uncover said relief passage.

9. In a delay action valve for delaying the flow of fuel to a burner the combination comprising, a hollow valve body, an inlet at one end of said body, an outlet spaced a substantial distance from said inlet at the other end of said body, fiuid pressure operable valve means movable between said inlet and outlet and having means biasing it toward a position near said inlet, a bypass passage extending from said inlet to the exterior of said body, a bypass valve for controlling the flow of fluid through said bypass passage, and slip-fricton means comprising a rod frictionally engaged by said valve means, said rod cooperating with said bypass valve to hold said bypass valve open and being operable by said fiuid pressure operable valve means to allow said bypass valve to be closed by fluid pressure.

10. In a delay action valve for delaying the flow of a liquid the combination comprising, a hollow valve body, an inlet at one end of said body, an outlet spaced a substantial distance from said inlet at the other end of said body, fluid pressure operable valve means movable between said ends of said body and having means biasing it toward a position near said inlet end, a bypass passage extending from said inlet to the exterior of said body, a bypass valve for controlling the flow of fluid through said bypass passage, and slip-friction means comprising a member frictionally engaged by said valve means and movable therewith, said member holding said bypass valve open and being operable by said fluid pressure operable valve means to allow said bypass valve to be closed by fluid pressure, said valve means controllin said outlet.

8 References Cited in the file of this patent UNITED STATES PATENTS 5 Number Name Date Steedman Feb. 6, 1917 Gaines Jan. 19, 1937 Perkins Nov. '7, 1939 J aworowski Feb. 20, 1940 Hill May 14, 1940 Huber Aug. 2'7, 1940 Keller Sept. 29, 1942 Case May 3, 1949 Senninger Nov. 29, 1949 Lyman Jan. 17, 1950