Abstract: A flow rate regulator (1) for limiting a flow rate of a fluid, in which a clear opening dimension (5), which can be modified between a maximum and a minimum, of a control opening (3), may be defined by an interaction between a control element (2) and a housing (4) of the flow rate regulator (1). The clear opening dimension (5) of the control opening (3) can be modified by a deformation of the control element (2) as a function of a pressure acting on the control element (2). The control element (2) has at least two segments (6) which are detached from one another and can each be deformed as a function of pressure, and an edge (7) defining the control opening (3) is formed by the control element (2) and the housing (4).

Abstract: An automated glass scoring device and a pillar post are provided. The pillar post includes a body having a fluid inlet port, at least one internal passage, a fluid exit port, and a fluid flow metering element. At least a portion of the fluid flow metering element is disposed within the internal passage. The at least one internal passage provides a path for a fluid flow from the inlet port to the fluid exit port, and the fluid exit port is positioned such that the fluid flow exiting the fluid exit port exits in close proximity to the cutter wheel.

Abstract: Severe service industrial valves having at least one valve ball and seat that can be repaired or replaced while the valve remains connected in-line with inlet and outlet pipe lines.

Abstract: A switching device includes a rod, a rotating shaft, and a valve assembly including a cover and a plug member. The cover engaged with the valve body has a first block section, a second block section, a space, and a threaded hole communicates with the space. The plug member is rotatably provided in a chamber of the cover, changing an area of an opening of an inlet hole. The rotating shaft has a projection is adapted to drive the plug member to rotate. A rod body of the rod has a threaded section engaged with the threaded hole. When the projection abuts against the first block section, the plug member seals the inlet hole. When the projection abuts against the rod, the plug member changes the area to a first area. When the projection abuts against the second block section, the plug member changes the area to a second area.

Abstract: A ball shaft for a coolant valve includes a body extending from a first end to a second end through an intermediate portion defining an axis of rotation, and a ball section formed on the intermediate portion. The ball section includes an outer surface, an inner surface that forms a coolant receptacle, and a slotted opening extending from the outer surface to the inner surface. The slotted opening includes a width of between about 0.0374? (0.9499 mm) and about 0.0364? (0.9246 mm).

Abstract: A plug member of a gas valve includes a main body. The main body has an axial bore in an axial direction, a first inlet and a second inlet in radial directions, and a guiding slot on a surface. The first inlet and the second inlet are connected to the axial bore. A diameter of the first inlet is greater than a diameter of the second inlet. The guiding slot has a first end communicated with the first inlet and a second end communicated with the second inlet, and a width of the guiding slot gradually reduces from the first end to the second end. Therefore, the gas valve may provide a gas flow with a linear change by controlling the plug member.

Abstract: In certain embodiments, a valve assembly can comprise a housing, a valve body, a first burner nozzle member and a second burner nozzle member. The housing can define an oxygen depletion sensor (ODS) inlet and a burner inlet. The valve body can be positioned within the housing and configured to rotate between a first position for a first fuel type and a second position for a second fuel type different from the first.

Abstract: A valve assembly includes a valve housing having an upper body portion and a lower body portion that define an internal chamber for accommodating a valve member. The housing has axially aligned inlet and outlet ports. The valve assembly includes a generally spherical valve member seated within the internal chamber that defines first and second bores. The first bore defines a first longitudinal axis and the second bore defines a second longitudinal axis offset relative to the first longitudinal axis. The valve member is mounted for movement between a first position and a second position. The valve assembly includes a caroming mechanism for moving the valve member between the first position and the second position, including cam surfaces formed on the exterior surface of the valve member and a cam pin formed on the interior surface of the upper body portion of the housing.

Abstract: A duel fuel gas control valve controls the supply of gas (e.g., natural gas or liquid propane gas) to a gas grill. The duel fuel gas control valve is structured to control either natural or LP gas flow at the desired operating characteristics based on conventional gas supply characteristics and gas grill requirements. A restrictor mechanism, when in first and second configurations, respectively, restricts movement of the valve core to a first predetermined range for a first mode of operation (first type of gas supply) and to a second predetermined range for a second mode of operation (second type of gas supply).

Abstract: A valve assembly for use in a wellhead assembly that includes a valve body, a cavity formed in the valve body, and a flow passage through the valve body that intersects the cavity. Also included is a gate slidable in the cavity between an open position and a closed position. A bore is formed through the gate. A fluidic passage is also formed through the gates that provides fluid communication between the bore and an upstream side of the valve member. The fluidic passage is formed so that when the gate is being moved into the closed position, fluid upstream of the gate enters the fluidic passage and exits into the bore to assist closing the valve.

Abstract: Regulation valve for a gas cooking appliance adapted for the supply of first and second different types of fuel gas, such as natural gas or liquefied gas. The regulation valve has a valve body with an inlet conduit and an outlet conduit, and a rotatable regulating organ housed in the valve body. The regulating organ has a plurality of inlet holes connected to the inlet conduit which, by means of the rotation of said regulating organ allow a gas flow to be altered, the inlet holes of the regulating organ corresponding to the first type of fuel gas are in a first axial position and the inlet holes corresponding to the second type of fuel gas are in a second axial position.

Abstract: Various embodiments of a gas valve and a sear-zone gas burner are described and claimed herein. One embodiment described herein relates to a cooking chamber with a cooking surface, which has at least two portions including a first portion and a second portion. The first and second portions of the cooking surface each have at least one heat source disposed underneath. The at least one heat source for each cooking surface in turn has a highest setting such that a first maximum heat output is provided to the first portion of the cooking surface when set at the highest setting and a second maximum heat output is provided to the second portion of the cooking surface when set at highest setting, wherein the second maximum heat output provided to the second portion is greater than the first maximum heat output provided to the first portion of the cooking surface.

Abstract: An apparatus for controlling a fluid flow rate includes a main body having a fluid flow passage and a cavity adapted to receive a flow control body having two or more flow channels therethrough. The flow control body may be moved within the cavity to two or more positions, each position corresponding to fluid communication between the flow passage of the main body and a different one of the flow channels of the flow control body. The flow control body may be held in each position by a detent feature that resists movement of the flow control body until a movement force acting upon the flow control body exceeds a threshold.

Abstract: A regulation valve having a valve body with a gas inlet. Housed within the valve body is a rotary regulatory body having a first inlet orifice corresponding to a first minimum flow of a first type of gas and a second inlet orifice corresponding to a second minimum flow of a second type of gas. The first and second inlet orifices are angularly displaced so that when the regulatory body assumes a first angular position within the regulatory body the first inlet orifice faces the gas inlet and so that when the regulatory body assumes a second angular position within the regulatory body the second inlet orifice faces the gas inlet. The regulation valve includes first and second sets of cooperating features that are capable of limiting rotation of the regulatory body to the first and second angular positions, respectively.

Abstract: A gas rotary valve comprises a valve body (1), a valve core (2), a valve cover (3), an actuating shaft (4) and a regulator positioning pin (6). The valve core (2) has a large through hole (22), a first small through hole (23) and a second small through hole (24) which are all disposed on a peripheral surface of said valve core (2). A guide pin (41) radially disposed on the rear end of the actuating shaft (4), a first step (3a;3c), the rear end (61) of the regulator positioning pin (6) and a second step (3b;3d) are disposed in distance in the inner chamber of said valve cover (3), respectively preventing the guide pin (41) from rotating. The three through holes on the peripheral surface of the valve core can respectively be communicated with the inlet passage of the valve body.

Abstract: A conical rotary valve includes a conical valve body including a frustum of a cone and a first fluid passageway. The valve further includes a conical engagement body at least partially covering the conical valve body, where the conical engagement body comprising a second fluid passageway. The valve includes a valve actuator rotatably engaged to the conical valve body to provide a variable flow area that includes an intersecting area of the first fluid passageway and the second fluid passageway. The first fluid passageway and the second fluid passageway are structured such that a value ?Af/??v is monotonically increasing, where Af is the variable flow area and ?v is a rotational angle of the conical valve body.

Abstract: A duel fuel gas control valve controls the supply of gas (e.g., natural gas or liquid propane gas) to a gas grill. The duel fuel gas control valve is structured to control either natural or LP gas flow at the desired operating characteristics based on conventional gas supply characteristics and gas grill requirements. A restrictor mechanism, when in first and second configurations, respectively, restricts movement of the valve core to a first predetermined range for a first mode of operation (first type of gas supply) and to a second predetermined range for a second mode of operation (second type of gas supply).

Abstract: A regulation valve having a valve body, a rotary regulatory body and a drive shaft attached to the regulatory body. The rotary regulatory body is housed in the valve body and has a plurality of inlet orifices that may be positioned to face a gas inlet by rotating the regulatory body by use of the drive shaft. A first inlet orifice corresponds to a first minimum flow of a first type of gas, and a second inlet orifice corresponds to a second minimum flow of a second type of gas. The first and second inlet orifices situated in the regulatory body at different angular positions. The drive shaft and the valve body have cooperating features that limit the angular rotation of the regulatory body to a second angular position where the second inlet orifice is aligned to face the gas inlet. Attached to, or incorporated into the regulation valve, is a stop element which can be arranged in an active position or in a rest position.

Abstract: A valve (13a) is described comprising: a housing (50) having a fluid inlet for (54) receiving a flow of compressed fluid and a fluid outlet (55); a flow duct (60) movably mounted with respect to the housing, the duct (62) having a fluid inlet (62) for receiving a flow of compressed fluid and a fluid outlet (65), the fluid outlet being positioned around at least a part of the circumference of the duct and being dimensioned to provide a different flow rate at different sections or positions around the circumference of the duct; the fluid outlet of the housing being alignable with a portion of the fluid outlet of the duct to provide a flow rate related to the relative position of the portion of the fluid outlet of the duct and the fluid outlet of the housing; and, a drive element (70) for moving, e.g. rotating, the duct with respect to the housing such that a desired portion of the fluid outlet of the duct aligns with the fluid outlet of the housing. The valve may operate as a so-called throttle valve.

Abstract: An adjustable regulator insert (1) for valves, in particular for controlling liquid flow in a plant for central hearing or air-conditioning, which insert (1) comprises an inflow opening (10) and an outflow opening (20). The area of at least one of said openings (10,20) is adjustable, said at least open opening being defined by an overlap between a first flow passage (16) in a first plate shaped element and a second flow passage (15) in a second plate shaped element. The first and second plate shaped elements are displaceable relative to each other, such that said first flow passage (16) and second flow passage (15) in the two plates are displaceable relative to each other in order to vary the area of said opening. The second plate shape element is displaceable in two different directions, such that the displacement in one direction can be adjusted independently of the displacement in the other direction.

Abstract: Various embodiments of a gas valve and a sear-zone gas burner are described and claimed herein. One embodiment described herein relates to a control valve for regulating the flow of gas to a burner tube for a barbecue grill, wherein the control valve includes multiple flow settings, including a sear setting. At the sear setting, the valve is capable of providing additional gas flow to the gas burner to provide the intense heat needed to sear food. At the remaining settings, the valve is capable of providing an appropriate amount of gas flow for conventional cooking of food. Another embodiment of the gas valve is adapted to reduce the rotational offset between the off position and the maximum flow position as compared to the valves of the prior art. In that embodiment, the angular offset between the off position and the maximum flow position is approximately 45°.

Abstract: Mechanisms and method of flow control for use in an oscillating sprinkler that varies the water stream height to lessen the adverse effects of wind on the water streams. The flow control mechanism varies water flow during rotation of a spray tube of a sprinkler to control the height of water streams in predetermined portions of the rotation.

Abstract: The invention is a flow controller attachable to a water supply. The controller has a body with inlet and outlet connections and a control element positioned between the inlet and outlet. The controller has an actuator extending from the control element that permits selection of three different settings. The first setting aligns a set of openings in the control element with the inlet and outlet of the body permitting unimpeded full flow of water. A second setting aligns another set of openings, which form a weep hole, in the control element to substantially impede flow from the inlet to the outlet. A third setting aligns a third set of openings in the control element with a flow control device, to partially impede flow from the inlet to the outlet, creating a low flow.

Abstract: The invention relates to a manual gas valve for use with either LP gas or natural gas operation with the purpose of solving the technical dilemma that the existing gas valve cannot be converted conveniently for use with different gases having different heating values. The manual gas valve of the present invention comprises a nozzle 1, a 8×1.9 O-shaped ring 2, a nozzle holder 3, a valve body 4, a faucet 5, a regulating lever 6, a 1.78×1.78 O-shaped ring 7, a spring 8, a stop plate 9, a pair of bolts 10, a mounting cover 11, and a valve stem 12. By utilizing the manual gas valve of the present invention, LP gas and natural gas can be used interchangeably and the gas flow can be conveniently regulated to achieve a similar heating value with either LP gas or natural gas operation. In addition, the conversion is easy and convenient, without requiring the use of any special tools or relying on any additional testing apparatus.

Abstract: Fluid regulators are disclosed. An exemplary fluid regulator having a cylindrical body and a reduced diameter portion adjacent an open end of the fluid regulator along with a flow selector positioned adjacent the open end of the fluid regulator and having a diameter larger than the reduced diameter of the cylindrical body is disclosed. Another exemplary fluid regulator having a pressure reduction section positioned within a housing is disclosed.

Abstract: The cooking appliance (1) having a control panel (2) is equipped with one or more gas flow (Q) regulating valves, wherein the rotary regulating plug (6) is provided with various peripheral through holes (16-19). The control knob (9) being interchangeable for fitting to the actuating shaft (7), is chosen from the two units available, one and the other permitting different angular limit positions of the regulating plug (6) for the supply of a constant minimum gas flow Qmin, adjusted each one for a different type of gas N gas or LP gas. The outlet conduit (5) of the valve is equipped with a further injector nozzle (21,23) for adjusting a constant gas flow Qmax to be fed into the conduit (25) of the correspondent burner, when the cooking appliance is supplied with a LP gas.

Abstract: A floor-cleaning machine (10) has a chassis (12) that is mobile on a surface and carries an agitating mechanism (14) to engage the surface. A fluid delivery system (18) conveys fluid from a reservoir (16) to the surface proximate the agitating mechanism (14). The fluid delivery system (18) includes a flow control valve (20) having a body (24) and a flow control member in the form of a ball (22) constrained within the body (24) and rotatable about an axis. A first passage (30) and a second passage (32) are defined in the ball (22), with the second passage (32) having a cross sectional area smaller than a cross sectional area of the first passage (30). The ball (22) is pivotable between a high flow position and a low flow position. In the high flow position, the ball (22) is positioned to allow fluid flow from a upstream duct (26) to a downstream duct (28) through the first passage (30).

Abstract: A hand-held dispenser for precisely controlling the flow rate of water therethrough and for precisely controlling the metering of a liquid chemical into the water passing through the apparatus.

Abstract: A ball valve apparatus 10 for clearing an obstruction in a conduit is disclosed. The ball valve apparatus 10 incorporates a wear resistant choke tube 42 in the downstream opening 40B of the ball 36. The choke tube 42 can be two to four times smaller than the opening 40A on the upstream side of the ball 36. Removal of catalyst through the choke tube results in lower velocity of the flow through the bore of the valve, thereby reducing wear and erosion. In normal operation in an FCC unit, catalyst is extracted from the system through the choke tube 42. When the conduit becomes plugged, the ball valve apparatus 10 can be cycled into a fully opened position, thereby creating a high flow rate of fluid through the conduit, removing any existing obstructions.

Abstract: The cooking appliance (1) having a control panel (2) is equipped with one or more gas flow (Q) regulating valves, wherein the rotary regulator organ (6) is provided with various peripheral through holes (16–19). The control knob (9) being interchangeable for fitting to the actuating shaft (7), is chosen from the two units available, one and the other permitting different angular limit positions (A2, A3) for the supply of a constant minimum gas flow Qmin, through one of two successive holes (18, 19) calibrated each one for a different type of gas NG or LPG, one or the other hole being superimposed to a valve inlet duct (4) at a different angular position A2, A3. An integral lug (14) on the control knob (9) running into a slide groove (20) in the control panel (2), establishes a first rotation stop A2.

Abstract: Apparatus and methods for operating a valve assembly for a dual chamber orifice fitting. The dual chamber orifice fitting comprises a body attached to a top. A passageway connects between the body and the top and allows an orifice plate carrier to move between the body and the top. A valve assembly selectably closes the passageway. Embodiments of the valve assembly comprise a seat, a plug, and a stem. The valve assembly has a closed position, wherein a curved outer surface of the plug sealingly engages a curved sealing surface of the seat and prohibits fluid communication through the passageway. The valve assembly has an open position, wherein a plug aperture is aligned with a seat aperture to allow the orifice plate carrier to move through the passageway.

Abstract: A method for controlling fluid flow. A fluid (560) can be communicated to a first fluid flow port (105) disposed adjacent to a first surface (196) of a rotatable disk (115) of a homopolar motor. The fluid can flow through at least one orifice (130) in the rotatable disk to a second fluid flow port (110). The rotation of the disk can be selectively controlled to vary a fluid flow rate. Further, the disk can be rotated to align a selected one of the orifices with at least one of the first and second fluid flow ports. In another arrangement, the shape of the orifice can have a radial width that increases in a circumferential direction.

Abstract: A multiple port valve integrated with the function of the sample shut off valve is disclosed. The integration of the sample shut off function eliminates extra plumbing and labor costs associated with a separate sample shut off valve. Additionally, the multiple port valve integrated with the function of the sample shut off valve provides a shorter equilibration time and less tubing volume.

Abstract: A choke valve having a coarse setting choke means and a fine setting choke means placed in parallel to it. The coarse setting choke means is able to be switched over in stages between different degrees of choking with different choke cross sections. The fine setting choke means renders possible a stepless adjustment of its choke cross section.

Abstract: A ball valve has a body, a stem engaging a ball closing component having a main flow hole and auxiliary flow holes, and a spanner having shaft body and a handle. The shaft body has a base with a seating hole and a latch with an elastic pressure element located slidably in the base. In the body there is a recess which accepts an end of the latch to retain the spanner in a position where flow is effected through the auxiliary flow holes and not the main flow hole. The shaft body is connected with the stem by a screw. A handle is connected to an upper end of the shaft body.

Abstract: A sprinkler includes a handle, a barrel, a nozzle, and a detergent dispensing mechanism. The barrel is fastened at one end with the handle, and at the other end with the nozzle. The detergent dispensing mechanism is fastened to the periphery of the barrel and is contiguous to the handle. The mechanism has a detergent holder and a detergent control switch. The detergent holder is provided with a water hole and a detergent hole, which are in communication with a water duct of the barrel. The detergent control switch is used to open or close the water hole and the detergent hole of the detergent holder in the midst of operation of the sprinkler.

Abstract: A gas valve with linear regulation for gas burners that comprises a valve body (10), said valve body (10) comprising a gas chamber (15), an inlet conduit (16) and an exit conduit (14) communicating with said gas chamber (15); a cone (13) housed inside said gas chamber (15) so that a lower part (22) of said gas chamber (15) remains empty; and a rotating transmission shaft (17) via which said cone (13) rotates. The inlet conduit (16) is a diagonal channel communicating with the lower part (22) of the gas chamber (15), the lower chamber (21) of the cone (13) communicating with said lower part (22) of the gas chamber (15). The exit conduit (14) comprises a connection hole (1) communicating with the gas chamber (15).

Abstract: A rotational speed adjustment mechanism of a pneumatic tool, including an intake member, a speed adjustment valve and a case enclosing the intake member and the speed adjustment valve. The intake member is formed with an intake and an exhaust port which are not communicated with each other. A lateral outlet and a lateral inlet are formed on the sidewall of the body section for communicating the intake with the exhaust port. The speed adjustment valve has a collar coaxially fitted on the body section and rotatable between a full speed position and a slowest speed position. A full speed through hole and at least one slow speed through hole are formed on the sidewall of the collar. When the collar is positioned in the full speed position, the full speed through hole is coaxially communicated with the lateral outlet, whereby the full diameter range of the lateral outlet provides a passage for the airflow.

Abstract: A liquid diluting device, with a small and simple structure, is capable of reliably sealing and simply changing dilution concentration. Diluent passages are formed in a first body, and a connecting passage for introducing special liquid connects to these diluent passages. A cylindrical dial covering an opening section of the connecting passage is rotatably provided on an outer section of the first body, a plurality of jets passing through from the inside to the outside are formed in conjunction with this cylindrical dial, and the diameters of the plurality of jets are different. A liquid supply passage is set at a position opposite the connecting passage, so that the cylindrical dial is sandwiched between the liquid supply passage and the connecting passage, and the connecting passage and the liquid supply passage are connected by a jet having a diameter matching the dilution factor to introduce special liquid from the liquid supply passage to one of the diluent passages.

Abstract: The valve device (1) includes a valve body (2) defining a fluid flow duct (30) having a plug (20) disposed therein, the plug having a main flow opening (21) and being movable between a first position in which the main flow opening co-operates with the flow duct, and a second position in which the plug closes the duct. The plug further includes secondary flow means (22) offset relative to the main flow means and enabling the hydraulic characteristic of the valve device to be controlled.

Abstract: The valve device (1) includes a valve body (2) defining a fluid flow duct (30) having a plug (20) disposed therein, the plug having a main flow opening (21) and being movable between a first position in which the main flow opening co-operates with the flow duct, and a second position in which the plug closes the duct. The plug further includes secondary flow means (22) offset relative to the main flow means and enabling the hydraulic characteristic of the valve device to be controlled.

Abstract: An aerial valve for controlling gas flux comprises a vessel connected between an air exit and an air entrance of a gas source and having an axial larger cavity; an inner container arranged and fixed in the axial larger cavity and having an axial middle cavity and two ventages corresponding to the air exit and the air entrance; an adjusting means having a hollow portion arranged in the axial middle cavity and having an air inlet, a smaller air outlet and a larger air outlet corresponding to the ventages, the two air outlets being communicated with the air inlet. The inner container is placed between the vessel and the adjusting means and is made of leakageproof material. The adjusting means is coaxially and rotably assembled with the vessel on bottom thereof.

Abstract: The current invention is a linearly regulated gas valve for a gas burner, utilizing a central plug to control the gas flow. This valve has the capability of providing a smoothly increasing or decreasing gaseous flow between the highest setting and the lowest setting, allowing the user a wide choice of settings for any particular food that is being prepared on the gas burner. This invention also does not require an additional jet to operate at the low setting.

Abstract: The present patent prescribes a new “GAS VAL VE”, according to which the valve, instead of having two different internal components that work with only one type of gas feed each, now has internally a component that simultaneously works with two types of gas, being that for such, one simply needs to change its position on the inside of the valve.

Abstract: The current invention is a linearly regulated gas valve for a gas burner, utilizing a central plug to control the gas flow. This valve has the capability of providing a smoothly increasing or decreasing gaseous flow between the highest setting and the lowest setting, allowing the user a wide choice of settings for any particular food that is being prepared on the gas burner.

Abstract: In a rotary metering valve, a metering block is located in a chamber having a plurality of outlets. The metering block is connectable to a fluid supply and has an outlet selector rotatable to select one of several different outlets from the block to the chamber. A barrier extends between the wall of the chamber and the metering block to prevent fluid flowing in a 360 degree rotary motion around the block. A sprayer check valve is also disclosed. The valve has a diaphragm acted on by control fluid whose pressure is set to just below the spray fluid pressure and which is varied according to variations in the spray fluid pressure.

Abstract: A control valve assembly for a pilotless gas burner in which the valve has a gas inlet port and a single gas outlet port. Interposed between the gas inlet port and the single gas outlet port is a sleeve that provides predetermined amounts of gas flow to the single gas output port depending upon a plurality of orifices in the sleeve being opened or closed. The valve automatically closes if the main burner flame is extinguished and must be restarted manually. Further, manual control of the valve is provided by a shaft which is rotatably and axially inserted into the valve to provide ignition fuel to the burner and to regulate the amount of fuel flow through the sleeve to the single output port and the burner.

Abstract: A rotary valve assembly includes a housing for positioning on an engine of the piston and cylinder type. The housing includes an intake passage for conducting a working fluid to the cylinder and an exhaust passage for conducting the working fluid from the cylinder. The housing has an internal cavity which intercepts the intake and exhaust passages, which cavity contains a rotary valve member having a window. The window is so positioned that when the member is rotated, it opens and closes the intake and exhaust passages in a periodic manner. The valve assembly may also include a throttle member mounted in the housing parallel to the rotary valve member. The throttle member has a hole which may be positioned opposite the intake passage.

Abstract: A cooking machine control system for controlling the consumption of fuel by cooking machines, including cooking machines of the type used in restaurant kitchens, such as gas/barbecue broilers, and home cooking machines such as grills, and gas flow valves usable in such cooking machine control systems. The cooking machine control system controls the flow of gas to the burners of the cooking machine to maintain the cooking surface of the cooking machine at an appropriate standby temperature when no food is being cooked, to bring the cooking surface to an appropriate cooking temperature for a predetermined period of time when food is being cooked, and then to return the cooking surface to the standby temperature. In one embodiment, a valve in the gas pipe controls the flow of the gas to provide the desired cooking levels.

Abstract: First to third openings are formed stepwise in a rotor side wall portion of a flow control valve disposed in a hot water circuit. Third positions (a) and (b) are established between a first position in which a first communication passage for communication between inlet and outlet pipes of the flow control valve is fully closed and a second position in which the first communication passage is fully opened. A duty control is performed so that the rotor reciprocates repeatedly among the above four positions. In this way, in the flow control valve for controlling the amount of the fluid flowing in the fluid passage, the valve colliding noise, the water hammer noise, and the temperature variation in the heating heat exchanger can be reduced.