DE2362905A1 - Gas flow control valve - is governed by pressure variation in sensor chamber opening membrane on valve plunger - Google Patents

Abstract

A membrane operated tapered valve plunger controls the gas flow through-the regulator valve. The membrane is deflected by pressure variations in the sensor chamber, thus responding to one or several parameters. An adjustable compression spring which acts on the membrane is used to calibrate the valve. A solenoid plunger pushes the valve taper into its seat when the valve is switched off, thus interrupting any gas flow. The solenoid mechanism is situated on the opposite side of the valve housing to the membrane and its spring.

Description

Parkinson & Cowan Appliances Limited. Stechferd _f Birminghaa

(England) '-

Control valve.

The present invention relates to control valves for Fluids.

The task; the invention consists in the matching Design of control valves for fluids, e.g. gases or liquids

Bie invention solves this problem in that the valve housing a first, a second and a third chamber, wherein a first valve member is provided which is between a first operating position in which it prevents the fluid from flowing between the first and second chambers, and a second operating position in which it allows the flow to pass between the first and second chambers, and a second valve member is provided, which during operation the slope of the flowing tfediu »· regulates which between the second and a third chamber Depending on one or more predetermined parameters flows.

The second valve element preferably acts with a membrane together, which is movably arranged and in operation the variation of one or more parameters responds · eggs »- at the membrane forms part of the boundary of the third chamber and extends between the third chamber and a control chamber, which from one or more pressure sources can be applied with pressure, dia one or men—

509826 / 031Ö

»AD QRlGi? ; _t * L

- * -. 2362305

r * re var determined define parasioters

Ites second valve member conveniently has a co-operating with the first valve member stop, through which the first valve member in its first B _e the aweite valve member driving stallung pressed into a position in which it interrupts the flow of fluid between the second and third Kamraeor.

The actuation of the first valve element can usually take place by means of a solenoid.

The control valve according to the present invention can in particular be used to feed a gas to regulate a gas burner, which is built into a central heating installation, with a movable membrane - as above mentioned - is provided <iie is arranged so that it is corresponding to a pressure that is appropriate for the air pressure, which ζ »B. is generated by a fan connected to the burner the combustion air supplies ψια / or for an air pressure is representative, which is in operation on the outer side of a Sets the purification channel, which is assigned to the system

KLe movable membrane can be adjusted by hand elastic organs are adjusted to a variable starting position

The invention is illustrated below with reference to a figure, which is a sectional view through an embodiment of a control valve according to the present invention.

The valve illustrated in the figure consists of a housing 10 which is detachable and substantially cup-shaped Has cap 11, which is provided with an opening

- 3 509826/0818

Base surface has an internally threaded sleeve 12 which can be screwed together with an externally threaded screw 13. A first chamber 14 _1, a second chamber 15 and a third chamber 16 are provided in the housing TO. The extreme chamber T'4- is directly connected to an incomprehensible gas inlet and the third chamber 16 is connected to an outlet, which is likewise not illustrated, for the gaseous medium.

The first and second chambers 14 and I5 are through a Partition 17, which has a valve seat 18, which surrounds the axial end of the opening I9 in the partition wall I7, which adjoins the chamber 14. A plunger 20 of a solenoid 21 is slidably mounted while maintaining its sealing effect in a part of the housing 10, which part the delimitation of the first chamber 14 forms. Here aligns the plunger 20 in the axial direction with the opening 19, so that the excitation of the solenoid 21, the plunger 20 from a first Operating position in which one axial end of the plunger 20 rests on the valve seat 1.8 in a sealing manner to allow a gas flow between the first chamber 14 and the second chamber 15 to avoid, transferred to the second illustrated operating position, in which the plunger 20 allows the passage of the gas between the first chamber 14 and the second chamber 15 allowed

A second partition 22 provided with an opening divides the second chamber 15 from a third chamber 16 · The one axial end 'of the opening 23 in the second partition wall 22 is at the side adjoining the second chamber is frustoconical Seat 24, which has a stump-shaped valve member 25 cooperates. The valve member 25 is on opposite sides axial ends with punch-like projections 26 and 27 provide. The die 26 as a stop extends before. the larger diameter end of the valve organc 25 up and is in operation from the free axial

509826/0818

The end of the plunger 20 is depressed when the latter is in its first operating position, inter alia to bring the valve member 25 into engagement with the seat 24, whereby a flow between the chambers 15 and 16 is interrupted. The 3temple-shaped approach 2? extends through the opening 23 in the partition wall 22 and is attached to an M _e mbraxi 28 which forms a part of the chamber 16 dar.Begrenzung ^ while pressure chamber together with the cap 11 a brisk! 29th Elastic organs, zE in the form of a spiral compression spring 30, are axially fastened between the underside of the membrane 28 and the screw 13, so that the pressure exerted by the spring 30 can be changed by the screw 13 rotatably arranged by hand in the sleeve 12 acts on the membrane 28.

The control valve described above is intended to regulate the gas flow of a gas burner which is built into a central heating system, which has, for example, a propeller, fan or the like for supplying combustion air to the burner. The holding pressure chamber 29 is provided with an inlet 31 which is connected to a pressure source which corresponds to the pressure to which the air is supplied by the fan. If the fan is set so that it works at a certain speed, the air pressure in the chamber 29 is adjusted accordingly and increases the force which is exerted by the Eeder 30 on the membrane 28. This ensures that the valve member 25 opens to a certain extent, which corresponds to a certain flow rate of the gas from the chamber 15 to the chamber 16. When the fan speed is increased, the air pressure in the chamber 29 is also increased, so that the valve element 25 is opened by a further amount and thus in turn sets a higher flow rate of the gas. Thus, an increase in the amount of combustion air supplied to the burner also results in an increase in the amount of gas supplied to the burner. The inlet y \ can

- 5 -509826/0818

also be connected to a pressure wave "which deo txstt- ^v pressure corresponds to that occurs in operation on the outer end of a Feuerungskanales which is ztfrgeordnet the central heating system · This serves to compensate for or at least to reduce the effects of air pressure to the suction, which in Operation is applied to the third chamber 16.

In operation, the plunger 20 and the valve seat 18 interacting with it only serve as an on and off valve, while the valve element 25 and the associated seat 2% act as a control valve which can be closed by the plunger 20 as an additional safety measure if this sits on the seat 18. This has the advantage that when the plunger 20 is moved into its second operating position, in which the gas can flow from the first chamber 14 to the second chamber 15, the valve element 25 slowly changes from a closed position to a position, in which it regulates the amount of gas which emerges at the outlet of the regulating valve, because the jolt in the regulating pressure chamber 29 brings about an effective damping of the movement of the membrane 28, whereby each excessive movement of the valve member 25 into one position prevented or at least reduced in its size, through which more gas flows between the chambers 15 and 16 than is desired, instead of connecting a pressure source which is representative of the pressure of the combustion air generated by the fan or another Pressure source, the pressure of which acts at the outer end of the flow of the equalizing chambers, can have several pressure sources, each with one or more parameters to be connected to inlet J1

Expectations

509826/0818

“AD QRIGJNAL

Claims (1)

A.BSP r ü T Λη control valve comprises / for fluid, such as liquids and gases, WEL \ y ches a Tentilgehäuse, characterized in that the valve housing (10) a first chamber (14), a second chamber (15) and a third chamber (16 ) pre see η _t that a first Ventilorgän (20) in a first be * - triebsstellBEig (14 prevents the passage of fluid flow between the first chamber) and the zwsiten chamber (15) while in a second operating position; releases the passage of the fluid between the first and second chambers, and that a second valve element (25) is provided, which determines the nature of the fluid in the flow from the second chamber £ 15) Jn the third channel (16) according to. controls one or more specified parameters. * 2} Control valve according to claim 1, characterized in that the second Yeatilorgan (25) is connected to a movable Kembraji (28} which adjusts depending on the variation of an ocEer of several parameters accordingly. 3) control valve according to claim 2, characterized in that d ± # F membrane (28) forms part of the boundary of the third chamber Ct & y and. extends between the third chamber and a regulating pressure chamber (29) which is under the action of one or more pressure sources which define one of several of the predetermined parameters. Control valve according to claim 2 or 3, characterized in that a spring (30) is provided which exerts a force on the core (2S) and that means are provided for changing the force exerted by the spring (30). - 7 - '509826/0818 5} Control valve according to one of the preceding claims ·, characterized in that the second Yentiiorgan (25)
has a stop (26) which cooperates with the first valve member (20) when the latter is in its first operating position in order to press the second valve member (25) into a position in which there is a flow of fluid between the second Chamber (15) and the third chamber (16) prevented. 6) cone valve according to one of the preceding claims, characterized in that the first valve member (20) 'means a solenoid (21) can be actuated. ORIGINAL 509826/0818 Blank