DE2443679A1 - PRESSURE REGULATOR - Google Patents

Description

PATENT Attorney DIPL.-ING. H. STRAW BAR

8000 MUNICH 60 MUSÄUSSTRASSE 5 TELEPHONE (08 9) 881608

9/12/19 / 4-SFW (4) 190-1354P

AGA_AKTIEBOLAG _{: i} _S _:: 1_8i__8i _> _Lidinsö_ ^ Scliweden2

Pressure regulator

The invention relates, to a pressure regulator, in particular for regulating the pressure in a tank for frozen liquefied gas, with a housing that has an inlet connection and separate first and second outlet ports and includes a diaphragm and a spring exerting an adjustable force on this diaphragm, which is set in such a way that the membrane is actuated by a pressure corresponding to a desired presettable pressure at the inlet connection Spring force is applied.

The pressure regulator designed according to the invention is primarily for regulating the pressure in a tank for frozen liquefied Determined gas, which is generally referred to as cryogenic liquid. With known constructions of tanks for such liquids, intended for the delivery of gas for its consumption, are two pressure regulators provided »One of these pressure regulators opens at a pressure that is lower than the desired working pressure, and it is connected to the armature of the tank in the pipe, that when the regulator is open due to the pressure of the liquid column in the tank, cryogenic liquid in an external heat exchanger, a so-called booster evaporator flows out. In this this liquid is evaporated and the upper part of the tank, the so-called Gas phase volume supplied. The gas has a larger volume than the liquid. Hence it comes to

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an increase in pressure when the system is closed. Upon reaching the intended working pressure closes the pressure regulator, and the pressure increase due to evaporation in the booster evaporator stop.

When a Cryogenflüssigkeit containing tank, is kept completely closed, it comes into its interior to a slow pressure rise, although the aforementioned pressure regulator is closed. This is due to the imperfections in the thermal insulation of the tank and the self-evaporation of the tank contents, which in turn is proportional to the resulting and unavoidable influx of heat. If the tapping of cryogenic liquid from the tank is less than the volume corresponding to the self-evaporation of the cryogenic liquid, the pressure in the tank increases until the pressure in it has reached the opening pressure for the associated safety valve. The opening of the safety valve of the system which then takes place leads to an undesirable loss of gas.

A cryotank for the delivery of gas, a so-called cold converter, is therefore also provided with a second pressure regulator, the so-called economy regulator, which then, when the pressure in the tank becomes higher than the set working pressure, a connection opens directly from the gas phase volume of the tank leads to the consumer outlet. When this economy regulator is open, there is then a discharge of small amounts Amounts of gas instead of liquid leaking out of the tank. This increases the pressure inside the tank lowered more quickly to the set working pressure, whereupon the valve of the economy regulator closes and only then opens again if this becomes necessary due to a renewed increase in pressure inside the tank.

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The systems described above that come with two separate Pressure regulators are provided, however, have certain disadvantages. So leads the need to incorporate two different pressure regulators to a corresponding increase in the cost of manufacture and assembly. In addition, the Setting the correct working pressure is difficult because the two pressure regulators are independent of each other and with a specific one specified pressure difference must be set. This adjustment process therefore requires a considerable amount of time Expenditure of time and places high demands on the skill and accuracy of this setting process concerned people. Regardless of this, there is still a great risk of incorrect operation. About that In addition, the risk of malfunction naturally increases rapidly with the number of components used.

The invention is based on the object of creating a pressure regulator of the type mentioned at the outset, which under Avoid the above-mentioned deficiency with a single device represents that can replace two pressure regulators and combines all necessary control functions.

The object set is achieved according to the invention in that a valve body is attached to the membrane, which interacts with a movable component in the housing which, together with the valve body, forms a combined valve - member forms that when the pressure at the inlet port matches the set pressure at a seat in the Housing rests, but leaves this seat and so a connection path between the inlet port and the first Releases outlet port when the pressure at the inlet port is lower than the set pressure while the moving component serves as a seat for the valve body,

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which stands out from this seat and thus a connection path between releases the inlet port and the second outlet port when the pressure at the inlet port is higher than the set one Pressure.

The pressure regulator designed according to the invention thus presents itself as a three-way regulator which has an inlet connection and having first and second outlet ports that are separate from each other and that are inside its housing contains a membrane on which a pressure is exerted by means of a spring, which is a fixed pressure on the Inlet port corresponds. In the main, the pressure regulator designed according to the invention is characterized by: that a valve body is attached to the membrane, which is designed to interact with one provided in the regulator housing Component is set up. If the pressure to be controlled falls below the pressure set on the membrane, forms this component together with the previously mentioned valve body a combined valve member, the in turn cooperates with a seat provided in the housing. When this combined valve member is from this seat lifts, a connection between the inlet port and the first outlet port is released. If the pressure to be regulated is higher than the pressure set on the diaphragm, this component forms the seat for the previously mentioned valve body, and when this valve body comes loose from the component, it gives a connection between the inlet port and the second outlet port free.

Advantageous refinements and developments of the invention are characterized in detail in the subclaims.

In the drawing, the invention is illustrated by way of example; show it:

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1 shows an embodiment for a three-way controller in the form of an axial section and

Fig. 2 an example of the use of such a controller in connection with a cold converter.

The three-way controller shown in Fig. 1 has three after connections leading to the outside and each designed as a sleeve, namely an inlet connection A1, a first outlet connection A2 and a second outlet port A3. The regulator shown is designed to respond to changes in pressure responds to its inlet port A1. Inside its housing made up of two sections 2 and 3 the regulator contains a membrane 1 which is clamped between these two sections 2 and 3. On top of the Diaphragm 1 is arranged a disc 4, which is supported by a helical spring 5 is applied. The coil spring 5 is seated with its lower end on the disk 4, and at its upper end At the end it stands over a pressure plate 6 under the action of an adjusting screw 7 from above into the section 2 of the housing is screwed in and depending on its screw-in depth the over the disc 4 of the coil spring 5 on the Diaphragm 1 applied spring force is determined. On the underside of the membrane 1, an annular body 8 with radial openings is arranged, which serves as a limit for a downward movement of the diaphragm 1 by being at a certain deflection the membrane 1 comes down to a stop surface 20 in the section 3 of the housing to the plant. To limit a Movement of the membrane 1 upwards, a step ring 9 is provided between the parts' pieces 2 and 3 of the housing which the disc 4 comes to a stop at a certain deflection of the membrane 1 upwards.

A valve body 10 is also attached to the membrane 1 and can come to rest on a seat which is formed by a hollow cylinder-shaped seat Bowl 12 and a seal inserted in it

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device 11 is formed, both of which have a central opening. A bellows 13 is tightly connected to the bowl 12, and the bowl 12, the seal 11 and the bellows 13 can be left move together in a cylindrical bore in section 3 of the housing. Inside the bellows 13 is a Housed coil spring 14, which exerts on the bowl 12 and the seal 11 an upward spring force. The second outlet port A3 is incorporated into a sleeve 15, which is in extension of the seal 11, the Bowl 12 and the bellows 13 receiving cylindrical bore in section 3 of the housing inserted into this is. A passage opening 16 leads from the inlet connection A1 to a space 17 below the membrane 1, while the first outlet connection A2 with a passage opening 18 in the section 3 of the housing is in communication.

As shown in Pig. 1 is the membrane 1 under the action of the helical spring 5 in a position that corresponds to a desired working pressure at the inlet port A1 and thus corresponds in a tank connected to it and its pressure to be regulated for deep-frozen liquefied gas. When the pressure at the inlet port A1 drops, the membrane 1 moves under the action of it onward spring force of the helical spring 5 downwards until the ring body 8 comes to rest against the stop surface 20. During this downward movement of the membrane 1, the valve body 10 also moves downward and pushes its own the movable seat formed by the seal 11, the bowl 12 and the bellows 13 also downwards. At in this When the seal 11 is in a downward position, there is a connecting path between the first outlet connection A2 via the passage opening 18 into the space 17 and further via the passage opening 16 to the inlet connection A1.

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This creates a flow from the first outlet connection A2 to inlet port A1, resulting in a pressure increase in the System results until the desired working pressure is reached. The membrane 1 then moves and with it the valve body 10 and also the bowl 12 with the seal 11 upwards, so that the connection between the first outlet connection A2 and the space 17 below the membrane 1 is interrupted. With this mode of operation of the controller the second outlet port A3 remains isolated.

When the pressure at inlet port A1 increases so that it exceeds the working pressure set for the regulator, the membrane 1 moves upwards until the disc 4 reaches the step ring 9. During this upward movement of the membrane 1, the valve body 10 is removed from the seal 11 and the bowl 12 is lifted, both under the force of the coil spring 14 in contact with a seat 19 in the section 3 of the housing remain = by this independent of the seal 11 and the bowl 12 upward movement of the valve body 10, there is a connection from the second outlet connection A3 to the space 17 below the membrane 1 and further via the passage opening 16 to the inlet connection A1. As a result, there is a flow from the inlet port A1 to the second outlet port A3, the so. Long continues until the pressure at inlet port A1 has reached the value set for the working pressure. The membrane 1 has then again reached its normal position shown in FIG. 1, and the valve body 10 is in turn on the Seal 11 on. This is the connection to the second outlet port A3 interrupted. When the regulator is operated in this way, there is no connection to the first outlet connection A2. The mode of operation of the controller corresponds to the economy mode described in the introduction.

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Thanks to the desired ability to different flow operation numerous changes can be made with regard to the structural design of details to to achieve sufficient passage cross-sections and other control properties.

In Fig. 2 is an example of a practical use a three-way controller according to Pig. 1 illustrates. In this embodiment, the controller is with the valve for connected to the pressure control in a refrigeration converter, as described in the introduction. This cold converter contains the frozen liquefied gas in a tank 23 which is enclosed by an inner vessel 21 and an outer shell 22 is, the space between this inner vessel 21 and the outer shell 22 to improve the thermal insulation is evacuated and filled with a powdery insulating material. The gas is withdrawn from the tank 23 via a Evaporator 26. In addition, the tank 23 is provided with an upper connection port 24 and with a lower connection port 25 provided. The system further includes a safety valve 27 and a filling device 28. A 3-way controller 30 designed according to FIG. 1 is via its inlet connection A1 and its two outlet connections A2 and A3 inserted into the system, with the first outlet connection A2 with a booster evaporator 29 is connected. A valve 31 »containing a check valve prevents flow in the wrong direction, when the controller 30 is working in economy mode. If the pressure is lower than the set pressure, a Flow from the first outlet port A2 to the inlet port A1 of the regulator 30, which is indicated in FIG. 2 by an arrow L. is indicated, which denotes the pressure increasing operation. If the pressure is higher than the set pressure, it happens

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- "9 -

to a stream from the inlet port A1 to the second outlet port A3 of the controller 30, which is shown in Figo 2 by a Arrow H is indicated, the economy mode of the controller 30 verans chauli cht.

A change can be made to the coupling shown in FIG. 2 insofar as the three-way controller 30 takes place after the pressure booster evaporation chamber 29 between this and a valve 32 can be inserted. In this way, liquid flows instead of during the pressure increase operation Gas through the regulator, resulting in increased flow capacity. If the controller 30 is working in economy mode, gas flows through the pressure booster evaporator in the opposite direction. Otherwise, the way of working is of the system the same as described above.

The training described above leads to a controller, which combines a pressure increase function and an economy function in a single device on a single connection of this controller. The other two connections of the controller always remain separate from each other. The setting of the working pressure for the regulator is easy, it only needs to turn a single adjustment knob to become. A wrong setting is excluded in this way. A faulty 'way of working can be easy to locate, as only a single controller needs to be checked. The laying of the pipes in the system is designed easier because there are fewer branching points. This fact combined with the fact that only one Controller is in use, makes the entire system significantly more cost-effective than the previously known systems of the same type.

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Claims (5)

Pressure regulator, in particular for regulating the pressure in a ■ [Thanks for deep-frozen liquefied GaS ₈ , with a housing which has an inlet connection and separate first and second outlet connections and contains a membrane and a spring which exerts an adjustable force on this membrane is set _? because the diaphragm is acted upon by a spring force corresponding to a desired presettable pressure at the inlet connection _P characterized in that a valve body (10) is attached to the diaphragm (1) which is connected to a movable component (11, 12) in the housing (2 $ 3) cooperates, which together with the valve body (10) forms a combined valve member which, when the pressure at the inlet connection (A1) matches the set pressure, rests against a seat (19) in the housing (2 _S 3), this seat ( 19) leaves and thus releases a connection path between the inlet port (A1) and the first outlet port (Δ2) when the pressure at the inlet port (A1) is lower than the set pressure _p while the movable component (11, 12) is used as a seat for the valve body (10) is used, which lifts off this seat and thus releases a connection path between the inlet connection (A1) and the second outlet connection (A3) j when the pressure at the inlet connection (A1) is higher i st than the set pressure, 2a pressure regulator according to claim λ $, characterized in that the movable component (H ₁₇ 12) has a movable seat in the housing (2, 3) and a flexible sealing connection between this seat and the second outlet connection (A3). 3. Pressure regulator according to claim 1 or 2 _9, characterized in that the movable component consists of a hollow cylinder-shaped _s 509830/0250 a central opening having bowl (12) and one it consists of a seated seal (11) which is shaped in such a way that that they come to be sealed contact on the one hand on the seat (19) in the housing (2, 3) and on the other hand on the valve body (10) can. 4. Pressure regulator according to one of claims 1 to 3> characterized in that that the movable component (11, 12) is connected to a bellows (13) which provides a flexible and tight connection forms between the movable component (11, 12) on the one hand and the second outlet connection (A3) on the other hand. 5. Pressure regulator according to claim 4, characterized in that a spring (14) is arranged within the bellows (13) between the bowl (12) and the second outlet connection (A3), the bowl (12) and bellows (13) towards the seat (19) in the housing (2, 3) to press. 509830/0250