DE2913393A1 - Modulated diaphragm valve for flow pipeline - has thermal motor actuated valve stem connected to flow regulating diaphragm - Google Patents

Abstract

The diaphragm actuated valve has valve closure element between inlet and outlet. The valve diaphragm is held as a closure plate in a chamber in the main flow path. The diaphragm can assume a large number of positions and the valve operations can be readily modulated. The position of the valve stem in relation to its actuator (32) can be optionally varied. Hence the diaphragm (11) is modulated in controlled manner by the actuator (109) connected to valve stem. This controls optionally the operating position of the valve stem relative to the actuator (32). The actuating arrangement can be a thermal motor with a large number of actuating positions for valve stem.

Description

Emerson Electic Go., St. Louis, Missouri, 65I36, V.St.A.

iodulating diaphragm valve

The present invention relates to a modulating valve of the type which can be used to modulate a flow in collision systems. While the invention below with reference to such Attachments "is described, is the more advanced for those skilled in the art Applicability of the valve disclosed below is immediately apparent.

Diaphragm valves under the control of a control valve are off known in the art. Generally these valves a flexible membrane between the valve inlet and outlet. The membrane contains an equalization opening; the high pressure fluid from the valve inlet can therefore compensate for the forces acting on the first and the second side of the membrane. If the valve is to be operated, a control valve is opened,

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which quickly relieves pressure on the first side of the membrane, so that the high-pressure fluid on the second diaphragm side, lift the diaphragm and thereby open the main flow channel through the Valve can open.

It is known to actuate the control part of the valve with an electromagnet in the diaphragm valves of the prior art. The electromagnet is generally operatively connected to the controller so that upon energization of the electromagnet the control part opens, while the control valve closes when the electromagnet is de-energized. The pressure difference between the two Diaphragm sides caused by the pressure relieved via the control valve are used to lift the diaphragm. While the diaphragm valves according to the prior art work satisfactorily, they are so far by the one-point operation ("single point operation"). The valves only work in one of two positions, so they are only fully open or fully closed; therefore they cannot modulate the flow in the main flow channel. It is also known that in applications where the inlet pressure of the fluid fluctuates widely over a wide range, electromagnetically actuated valves work unreliably. at If the inlet pressure is high, the valve data can be set insufficiently so that the solenoid fails. While you are with the Control valve unit initially on at low inlet pressures

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If you wanted to prevent the electromagnet from burning out, the pressure difference between the "two sides of the membrane" can be sufficient to open the membrane; the flow through the valve can then no longer be reliably predicted.

It is the object of the present invention to provide a membrane operated Specify valve in which the diaphragm can assume a variety of positions and can therefore modulate valve operation.

To solve this problem, a diaphragm-operated valve with a valve body with an inlet, an outlet, a Main flow opening between the inlet and the outlet, a chamber along the flow path on the inlet side of the main flow opening, a diaphragm movably mounted in the chamber, one attached to the diaphragm and movable with it Control valve means having an orifice in fluid communication with the chamber and the outlet and having a at least partially located in the valve opening valve pin on means for the position of the valve pin with respect to the control valve device to optionally change in order to make the membrane modulatable in a controlled manner, the position changing device an adjusting device attached to the valve pin which can operatively selectively control the position of the ventilator with respect to the opening of the control valve.

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The diaphragm operated valve according to the present invention has improved performance, but avoids many shortcomings, which occur in the diaphragm-operated valves according to the state of the art. As mentioned, the diaphragm valve can be used to modulate the flow through the valve by modulating the flow through the control valve so that it affects the diaphragm acting forces in a large number of membrane layers can assume a state of equilibrium. This is done in a preferred embodiment with a heat engine, which is axially relative a valve pin movably mounted in the control valve opening is arranged. The valve pin is powered by the heat engine moved directly into a precise position relative to the control valve opening.

The invention will now be considered with reference to the accompanying drawings be described in detail.

Pig. 1 is a cross-sectional view of an exemplary embodiment of the diaphragm valve according to the present invention in the closed position, while the

Pig. 2 shows a sectional illustration of a second exemplary embodiment of the diaphragm operated valve according to the present invention is in the open position.

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In the lig. 1 ", reference numeral 1 denotes an exemplary one Embodiment of the present invention. The valve 1 has a Valve housing 100 with a lower part 2 and an upper part 3.

The lower part 2 is generally formed by a tubular portion 75 with an inlet 4 and an outlet 5, which forms a partition 6 separates from each other. The partition wall 6 is preferably formed in one piece with the tubular section 75; if desired, they can be manufactured separately and inserted into section 75. The partition 6 is in the illustrated embodiment annular in plan view; its upper end 82 forms a central opening 90. The inlet 4 and the outlet 5 serve to insert the valve in a system. As shown, the pipe sockets 140 are on the inlet and outlet side of the section for this purpose 75 attached. The approaches 140 are with the section 75 connected in some expedient way.

The section 75 has a side wall 7 which delimits an opening 8 which is in communication with the opening 90 along the upper end 82 of the partition wall 6. Furthermore, the side wall 7 forms a flange 9 όμ around the opening 8. The partition 6 is arranged in relation to the opening 8 in the section 75 in such a way that it delimits an inlet chamber 76, while the opening 90 and the partition 6 are in flow connection with the outlet 5 and form an outlet chamber 77 with it. The flange 9 has a

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upwardly protruding lip 78 and a relatively wide one Support surface 79 on. A shoulder 150 is molded into the lip 78, placed on a conventional seal 151 and set between the lower part 2 and the upper part 3 of the valve 1 is.

The upper end 82 of the partition 6 forms a seat 83 for a "valve assembly 61. The valve assembly 61 comprises a flexible membrane 11, for the purposes of the present invention Control valve element 32, a spring 38, a Yentil pin 44 and an adjusting device 110.

The upper part 3 is attached to the lower part 2 of the valve housing 100 along the flange 9 in a conventional manner; In the embodiment shown, conventional threaded bolts are used for this purpose. When fastened together, the parts 2, 3 delimit a diaphragm chamber 50. Before the lower part 2, 3 is screwed together, the various parts of the valve arrangement 61 are arranged in the opening 8 so that the outer edge of the diaphragm rests on the support surface 79 and in particular rests along a support device 120. The support device 120 is an annular disk that prevents the membrane from stretching when the valve 1 is closed. When the parts 2, 3 are screwed together, the membrane 11 is fixed in the valve 1. As mentioned, the seal 151 serves to prevent the fluid from escaping along the flange 9 between the upper part 3

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and the lower part 2 of the housing 100 to prevent.

The upper part 3 of the valve 1 has a base area 13 and a centrally located extension 14 which extends upwards from the base area 13 protrudes. It is common to use the base area for inserting the fasteners 10 in joining the parts 2,3. The exciter assembly 110 is on the valve 1 on the approach 14 of the Upper part 3 attached in an appropriate manner. For example you can provide a flange 121 which receives one end of a housing 11 for the exciter assembly 110. The housing 111 can on Splash 121, for example, be welded on or hard soldered.

A central opening 20 extends through the upper part 3 of the valve 1. The opening 20 has a predetermined number of axially aligned, but in the diameter of different sections 21, 22, 23 on. The membrane 11 divides the chamber 50 into a first chamber part 51 on the side of the membrane facing the section 23 and a chamber part 52 on the inlet side 4- of the membrane on. The section 22 serves as a fit for a spring 38, the between a wall 30 of section 22 and a plate 25 of the Diaphragm 11 is clamped.

The membrane 11 includes a central opening 26 sized so is that it can receive the control valve element 32. . The control valve element 32 has an upper part 33 with a control

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opening 34 as well as a lower plate 35 j which is attached to an entry approach 36 of element 32 is attached in any convenient manner. For example, you can reprint the input approach 36 that he the Diaphragm 11, the plate 35 and the upper part 33 of the Y-valve element 32 in a conventional manner overlying one another. In the membrane 11 there is a passage opening 26 which is a flow connection between the chamber part 52 and the Chamber part 51 produces. As mentioned above, the chamber parts lie 51 »52 on opposite sides of the diaphragm 11. Hence the pressure in the chamber part 51 is the same as in the inlet chamber 76 and in the chamber part 52 when the valve is in the closed position, which is shown in 3fig. 1 is shown. The 1 / valve pin 44 is in the upper part 3 between a first position in which it closes the control opening 34 in the control valve element 32, and a plurality of second positions reciprocally mounted, which are remote from the first position. The spring 38 exerts a force on the membrane 11 in the direction of its closed position in which it rests on the end 82 of the partition 6.

The exciter arrangement 11 has in the embodiment shown a heat engine 109 which is arranged in a compartment 112 formed by the housing 111.

The housing 111 has a lower part 113 and an upper part 114, which are fastened to one another _f to delimit the compartment 112, j

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ORKaINAL INSPECTED

A storage 115 runs in the upper part 114 over the width of the Housing 111. The bearing 115 allows the passage of the valve pin 44 during the operation of the valve 1. An isolator 116 is on the storage 115 arranged. The heat engine 109 has a heating device 117 between a plurality of pairs of disks 118 on. The heater 11? is traditionally a resistance heating element, which is carried by an insulating element and is arranged so that it the pairs of discs on conventional Way. The arrangement of the panes and the heating element can also be made differently from that in the drawing embodiment shown. The disk pairs 118 are composed of a first disk 102 and a second disk 103, that touch along their perimeter. The disks 102, 103 each consist of different materials different coefficients of thermal expansion, the two materials being connected to one another in a sandwich form to form the pane are. When heated, the different coefficients of thermal expansion cause a deformation of the discs where one side becomes concave and the other convex. Stretch the slices so as a result of the deformation that bends the pairs of disks, as shown in the figure. 1 is shown. A second isolator 119 is arranged on a stop 122, which in turn attached to pin 44 in a conventional manner; e.g. can the stop 122 is seated in a slot of the valve 44 with a friction fit. A spring 123 is between the stop 122 and the

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- 12 clamped bottom surface 124 of part 21 of the upper part.

The heater 117 is connected to the electrical connectors 125 connected to a power source. As will be appreciated by those skilled in the art, the application of electrical energy to the heating device 117 take place as a function of a detected state of the system in which the valve 1 is inserted. Farther you can include a temperature sensor in the disk stack, which allows feedback to the heater, such that the temperature of the stack regardless of the ambient or fluid temperature remains the same.

In the preferred embodiment, the Bück- · control indicator around a PN junction diode. When the diode temperature changes, the constant current response voltage also changes linear. This signal can be converted to an electronic circuit that controls the supply of power to the heater controls so that the target temperature is maintained.

The operation of the device 1 is relatively easy to understand. The fluid at the inlet 4 passes through the opening 26 to the section 23 or the chamber part 51 facing part of the membrane 11 where it - in cooperation with the spring 22 forces the diaphragm 11 against the partition wall 6 and in this way the main flow passage through the valve closes in the closing

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ORIGINAL INSPECTED

was the valve pin 44 so that it closes the control port; being the 3? 1 shows this valve state in dotted lines. If the "valve is to be operated, the heater is left on cool so that the pin 44 is withdrawn and the control port 34 opens. The high pressure flow from section 23 or the the chamber part 51 facing side of the membrane 11 by the Opening 34 on the low pressure outlet side of the valve 1 allowed the pressure of the fluid on the inlet side 4 of the valve to overcome the force exerted by the spring 38 and so that Open the valve in the conventional way.

The valve according to the present invention differs from the diaphragm valves of the prior art in that thereafter the membrane position can be modulated by the action of the valve pin 44. How the actuator works can therefore be controlled in such a way that the valve pin 44 has a number of positions with respect to the opening 34 in the control valve element 32 can take. While the valve pin 44 from the one shown in FIG The fully open position shown in solid lines moves downwards, it wants to block the control opening 34. During this increasingly closes, fluid penetrates from the inlet 4 through the opening 26 to the side of the membrane facing the section 23, so that this wants to close. If you hold the pen in this special position, the membrane begins to close until it lifts off the pin 44, so that again the pressure from the section

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. "or" of the chamber 51 facing side of the membrane is drawn to the outlet 5 through the control opening 34. The membrane 11 responds in this way _s Isis the membrane in an equilibrium position reaches the valve pin relative; that position is other than the fully closed or the fully open position, of course, an additional movement of the valve pin leads to a new equilibrium position of the membrane, and you can set any position between the open and closed position - in contrast to the diaphragm valves of the prior art, which only have a completely open position and can assume a completely closed position.

Fig. 2 shows a valve construction which ensures actuation of the valve even when there is little or no pressure difference between the inlet 4 and the outlet 5 in the system in which the valve 1 is to operate. In FIG. 2, the same reference numerals denote the same parts as in FIG. 1. As shown, the valve stem 44 has a projection 45 which projects through the control opening 54 to the outlet side of the diaphragm 11. A retaining ring 46 is attached to the extension 45, which is dimensioned such that it touches the extension 36 of the valve element 32 when the valve 1 is actuated _:

if the inlet pressure is insufficient to open the membrane. i The retaining ring 46 thus ensures that the contraction of the heat engine 109 the membrane. 11 also opens when the pressure difference between the inlet 4 and the outlet 5 is so small

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that it does not exist for practical purposes. Otherwise, the operation of the valve is the same as described above.

For those skilled in the art are in the light of the preceding disclosure and Numerous changes within the scope of the claims are apparent from the accompanying drawings. For example, you can use the control valve element 32 perform differently, the same. The outline of the upper and the Lower part 2, 3. Another construction for the heat engine 109 or the housing 111 can also be selected. During the Approach 4-5 is described here with a retaining ring, one can use any construction that widens the free end of the extension 45 for proper function. The expert other modifications will also occur; these are only exemplary .

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L e r s e i t e

Claims (5)

BERL1N33 8MUNICH 80 S: Dr. RUSCHKE & PARTNER PATENT LAWYERS Tel. (030) 8 26 38 95/8 26 44 81 B E R L I N - M Ü N C H E N ™ / Telegram address: Telegram address: Quadrature Berlin Quadrature Munich TELEX: 183786 TELEX: 522767 E 578 Claims 1 J Diaphragm-operated valve with a valve body with an outlet and an inlet, a main flow opening between the inlet and the outlet, a chamber in the flow path on the inlet side of the main flow opening in which a membrane is movably mounted, a control valve device attached to the membrane and movable with it with a control opening which is in communication with the chamber and the outlet, and with a valve pin located at least partially in the valve opening, characterized by a device which selectively changes the position of the valve pin (4-4) with respect to the control valve device (32) and so can modulate the membrane (11) in a controlled manner, the position changing device having an actuating device (109) attached to the valve pin which can operatively control the position of the valve pin (44) with respect to the control valve opening (34) selectively. 2. Valve according to claim 1, characterized in that the adjusting device »has a heat engine (109) with a plurality of axial positions for inderning the position of the valve pin (44). 909850/0566 3 · 'valve after. Claim 1 or 2, characterized in that the adjusting device is axially aligned with the valve pin. 4. Valve according to claim 1, 2 or 3, characterized in that
the valve pin (4-4-) runs through the control opening (3 ⁷ O and has a widening (46) at one end with which it can touch the control valve device (32) in at least one operating position of the actuating device. 5. Valve according to one of claims 1 to 4, characterized by
a first spring device (3B) arranged in the chamber (5Ό) which can exert a force on the membrane (11) in such a way that the
Membrane is pressed into its closed position, and that a
the second spring device (24) is operatively connected to the actuating device (109) and presses the valve pin (44) into its open position in at least one position of the membrane (11). 909850/0566