DE1900029C3

DE1900029C3 - Safety valve

Info

Publication number: DE1900029C3
Application number: DE19691900029
Authority: DE
Inventors: Auf Nichtnennung Antrag
Original assignee: Codetem Compagnie Pour Le Developpement De Techniques Modernes S.A.R.L., Lausanne (Schweiz)
Priority date: 1968-12-03
Filing date: 1969-01-02
Publication date: 1976-05-13

Description

19 OO19 OO

Auslaßdruck eines Reglers. An der Oberseite ist die Membran mittels einer äußeren Feder 4 für den Höchstabschlagdruck und einer inneren Feder 5 für den Mindestabschlagdruck belastet. Wird der zu kontrollierende Druck zu hoch, bewegt sich die Membran nach oben. Wird dieser Druck zu niedrig, bewegt sich die Membran nach unten.Outlet pressure of a regulator. At the top, the membrane is by means of an external spring 4 for the Maximum tee pressure and an internal spring 5 loaded for the minimum tee pressure. Becomes the one to be controlled If the pressure is too high, the membrane moves upwards. If this pressure becomes too low, it moves the membrane down.

Die Spindel 6 ist oben an die Membran gekuppelt und ist senkrecht verschiebbar in einer Bohrung 7 geführt. Die Bohrung 7 befindet sich in einem Oberflansch 8. der eine Kammer 9 oben verschließt. Der Oberflansch 8 ist mit Bolzen lösbar auf dem Ventilgehäuse 10 festgesetzt Das untere Ende der Spindel 6 ist in einer Buchse 11 geführt, die in einem Sackloch in dem Boden der Kammer 9 angeordnet ist. Im Bereich ihres unteren Endes ist die Spindel 6 in ihrer Umfangswand mit einer Einbuchtung 12 versehen. Diese wirkt mit einem Querstift 13 zusammen, der parallel zu sich Selbst verschiebbar in Schlitzen 14 (s. F i g. 2) eines Führungsbügels 15 geführt ist. Dieser Bügel ist an der Kammerwand festgesetzt. Der Querstift 13 ist mit einem die Spindel 6 umgebenden Bügel 16 verbunden, der unter Wirkung einer Druckfeder 17 steht. Diese Feder zieht den Querstift in die Einbuchtung 12 hinein. Der Bügel 16 ist mit einem Stift 18 fest verbunden, der die Kammerwand durchquert und den Schaltnocken 19 trägt. Wenn die Membran 2 die Spindel 6 nach ober oder nach unten bewegt, wird der Querstift 13 seitwärts aus der Einbuchtung 12 gegen den Druck der feder 17 hinausgedrückt Demzufolge gibt der Schaltnocken 19 den Fallhebel 20 und den Ventilverschluß 21 frei. Der Ventilverschluß fällt dann auf seinen Sitz 22, unterstützt von einer Feder 23, so daß der Mediumstrom im Ventilgehäuse unterbrochen wird.The spindle 6 is coupled to the membrane at the top and is guided in a bore 7 so that it can be moved vertically. The bore 7 is located in an upper flange 8 which closes a chamber 9 at the top. The top flange 8 is releasably fastened with bolts on the valve housing 10. The lower end of the spindle 6 is in a socket 11 guided in a blind hole in the The bottom of the chamber 9 is arranged. In the area of its lower end, the spindle 6 is in its peripheral wall provided with an indentation 12. This cooperates with a transverse pin 13 that is parallel to itself Is guided in slots 14 (see FIG. 2) of a guide bracket 15 so as to be displaceable. This bracket is on the Chamber wall fixed. The transverse pin 13 is connected to a bracket 16 surrounding the spindle 6, which is under the action of a compression spring 17. This spring pulls the transverse pin into the indentation 12. The bracket 16 is firmly connected to a pin 18 which passes through the chamber wall and the switching cam 19 wearing. When the diaphragm 2 moves the spindle 6 up or down, the transverse pin 13 becomes sideways pushed out of the indentation 12 against the pressure of the spring 17 the drop lever 20 and the valve closure 21 free. The valve closure then falls onto its seat 22, assisted by a spring 23, so that the flow of medium in the valve housing is interrupted.

Dank der beschriebenen Ausführung ist der Bedienungsmechanismus ganz dem Auge entzogen. Er ist durch Entfernen des Oberflansches 8 zugänglich. Der Mediumsirom braucht dabei nicht unterbrochen zu werden.Thanks to the design described, the operating mechanism is completely hidden from the eye. He is accessible by removing the upper flange 8. The medium sirom does not need to be interrupted will.

Bei Betriebsdrücken höher als 10 kg/cm² werden der Stift 18 und der Bügel 16 mittels eines Stiftes 24 entlastet, der an der rechten Seite des Bügels 16 befestigt ist und sich bis in den Druckraum des Ventilgehäuses erstreckt Die Stifte 18 und 24 haben denselben Durchmesser, der kleiner als der Druchmesser der Spindel 6 ist. Der Vorteil dieser Maßnahme ist eine geringere Reibung.At operating pressures higher than 10 kg / cm ² , the pin 18 and the bracket 16 are relieved by means of a pin 24 which is attached to the right side of the bracket 16 and extends into the pressure chamber of the valve housing. The pins 18 and 24 have the same diameter , which is smaller than the diameter of the spindle 6. The advantage of this measure is less friction.

Da die Spindel 6 mit ihrem unteren Ende nicht durch die Unterwand der Kammer 9 hindurchgeführt ist und nur bei dem Stift 18 eine Abdichtung in Form von O Ringdichtungen 25 vorhanden ist, ist der Einfluß des Mediumdruckes auf den Bedienungsmechanismus minimal. Die Verwendung des Stiftes 24, mit O-Ringdichtungen 26 abgedichtet, ist sehr wesentlich: es entfällt dadurch jegliche Beeinflussung von Druck Variationen im Gehäuse.Since the spindle 6 is not passed with its lower end through the lower wall of the chamber 9 and only in the case of the pin 18 a seal in the form of O ring seals 25 is the influence of the Medium pressure on the operating mechanism is minimal. The use of the pin 24, with O-ring seals 26 sealed, is very important: it eliminates any influence of pressure variations in the housing.

Der Ventilverschluß 21 kann aus seiner Schließstellung (mit strichpunktierten Linien in F i g. 1 angedeutet) in die geöffnete Stellung gemäß F i g. 1 zurückgebracht werden mit Hilfe eines Vierkantschlüssels, der den Vierkant 27 (F i g. 3) der Ventilspindel 28 erfaßt, die sich bis außerhalb des Ventilgehäuses erstreckt. Gewöhnlich ist der Vierkant 27 von einer Verschlußkappe 29 abgedeckt Da die Ventilspindel 28 durchbohrt ist (s. bei 30 in Fi g. 3), ist die Dichtung der Ventilspindel während des Betriebes entlastet.The valve closure 21 can from its closed position (indicated by dash-dotted lines in FIG. 1) into the open position according to FIG. 1 can be returned with the help of a square wrench, the the square 27 (Fig. 3) of the valve spindle 28 detected, which extends outside of the valve housing. Usually the square 27 is covered by a cap 29 Since the valve spindle 28 is pierced (see Fig. at 30 in Fi g. 3), the valve spindle seal is relieved during operation.

In der Wand des Ventilgehäuses ist ein Egalisationsnadelventil 31 (s. die F i g. 1 und 4) angeordnet, das bei geschlossenem Ventil und bei einem Mediumdruck im Gehäuse von mehr als 1 kg/cm² den Druck egalisiert.An equalization needle valve 31 (see FIGS. 1 and 4) is arranged in the wall of the valve housing, which equalizes the pressure ^{when the valve is closed and when the medium pressure in the housing is more than 1 kg / cm 2.}

Dichtungen 32 dichten die Kammer 9 hinsichtlich des Raumes 3 des Oberteils 1 ab.Seals 32 seal the chamber 9 with respect to the space 3 of the upper part 1.

Hierzu 2 Blatt ZeichnungenFor this purpose 2 sheets of drawings

Claims

19 OO claims:

1. Safety valve, the membrane of which is arranged in a chamber on the one hand by the gas pressure between the safety valve and a gas pressure control point and on the other hand by spring pressure loaded and connected to an actuating mechanism, with which by means of a into the interior of the housing extending pin and a cam connected to the pin, the valve closure flap iri their open position is kept and with that when a set value is exceeded Maximum pressure or falling below a set minimum pressure due to the diaphragm movement the flap is released from the cam for movement into the closed position is, characterized in that the actuating mechanism in a gas-tight and airtight Chamber (9) is arranged in the interior of the valve housing, which with that in the interior of the valve housing prevailing gas pressure applied pin (18) sealed by the wall of the chamber (9) is guided into this and, as a pressure relief member, another pin (24) is sealed into the Chamber (9) is performed. which has the same diameter as the pin (18) and that of the pin (18) is coaxial is arranged opposite.

2. Safety valve according to claim 1, characterized in that the membrane (2) is known per se Way is connected to a spindle (6) and the spindle (6) with its lower end in a Guide bushing (11) is guided in the lower wall of the airtight and gas-tight chamber (9) and itself in the direction of the membrane (2) sealed by a bore (7) in a chamber (9) closing off Oberwr.nd (8) extends, which is arranged so that it without interrupting the flow of medium is removable, and that furthermore the actuating mechanism has a transverse pin (13), which cooperates with an indentation (12) provided on the circumference of the spindle (6) and which cooperates in parallel slidable to itself in slots (14) of a guide bracket (15) on the inner wall of the gas-tight chamber (9) and connected to a bracket (16) guided around the spindle (6) which carries the pressure relief member (24) and is placed under the action of a spring (17), through which the transverse pin (13) can be drawn into the indentation (12), the bracket (16) being fixed to the through the wall of the gas-tight chamber (9) guided pin (18) is connected, the outside of the Chamber carries the cam (19) so that when moving the spindle (6) through the membrane (2) in both directions of movement of the transverse pin (13) the indentation (12) pushed out and the valve closure flap (21) by the cam (19) free is given.

6060

The invention relates to a safety valve whose membrane, which is arranged in a chamber, on the one hand through the gas pressure between the safety valve and a Gaddruckregulstelle and on the other hand through Spring loaded and connected to an actuating mechanism, with which by means of a in the Interior of the housing extending pin and a cam connected to the pin, the valve closure flap is held in its open position and nth that when a set maximum pressure is exceeded or falling below a set minimum pressure due to the membrane movement, the closure flap is released by the cam for movement to the closed position.

In safety valves of the generic type as well as in safety valves of a comparable design, essential parts of the actuation mechanism are exposed to both the atmosphere and the gas medium flowing through, so that corrosion phenomena occur, which in turn lead to functional impairments, which are particularly important in the case of safety valves with regard to the resulting danger to property and people is extremely detrimental. In the known safety valves there is also the risk of malfunction in that the gas pressure fluctuations in the valve housing can affect parts of the actuating mechanism.

The present invention is therefore based on the object of providing a safety valve according to the invention Art to create in which in a simple way both the risk of corrosion and the risk of Gas pressure fluctuations are eliminated.

The solution according to the invention is that the actuating mechanism in a gas and airtight Chamber is arranged in the interior of the valve housing, which with that prevailing in the interior of the valve housing Gas-pressurized pin is sealed through the wall of the chamber and inserted into it as a pressure relief member, another pin is sealed into the chamber and has the same diameter as has the pin and which is arranged coaxially opposite to the pin.

By accommodating the actuating mechanism in the gas-tight and airtight chamber, it is present Protected from the corrosive influences of both the gas medium and the outside air. The intended Pressure relief has the effect that the fluctuations in gas pressure inside the valve housing are reduced can no longer affect the actuation mechanism. Housing the gas-tight and airtight Chamber in the interior of the valve housing also leads to a simple, compact design.

The preferred embodiment of the subject matter of the invention characterized in the dependent claim contributes to a particularly simple design and easy assembly, disassembly and maintenance of the Safety valve at.

A preferred embodiment of the subject matter of the invention is shown below with reference to the drawings explained in more detail.

F i g. 1 is a longitudinal section through a valve according to the invention.

F i g. 2 is a partial illustration of the valve according to FIG. 1,

F i g. 3 is a section along the line IfI-III of FIG.

Fig.4 is a section along the line IV-IV of Fig. 1.

The F i g. 2 to 4 are drawn on a larger scale than FIG. 1.

The upper part 1 of the valve contains a membrane 2. The space below the membrane is of the to be controlled Pressure applied. Usually this is the