KR100540926B1 - Safety apparatus for sensing pressure - Google Patents

Abstract

The present invention aims to realize the rationalization of the pressure sensing safety device of a gas appliance using a small gas container by reducing the number of parts and reducing the number of assembly work. An object of the present invention is to provide a pressure-sensitive safety device with good operability that facilitates reuse and so-called reset. As a means of achieving this object, the pressure sensing safety device of the present invention is a stem integrating the piston of the check valve and the shut-off valve, and also detects the abnormal pressure abnormal pressure of the small gas cylinder on the stem. By retreating, the structure of the check valve is cut off inside and outside.

Description

Pressure Sensing Safety Device {SAFETY APPARATUS FOR SENSING PRESSURE}

1 is a cross-sectional view of a pressure sensing safety device according to a first embodiment of the present invention, the upper half of the figure shows a state in which the stem is in the original position, the lower half shows a state in which the safety device of the present invention operates.

2 is a cross-sectional view of the pressure sensing safety device according to Embodiment 1 which is normally used.

3 is a cross-sectional view showing a pressure reducer 10 equipped with a pressure sensing safety device according to a second embodiment of the present invention in the same manner as in the first embodiment.

Figure 4 is a sectional view of the pressure sensing safety device according to the third embodiment.

5 is a cross-sectional view of the pressure sensing safety device according to the fourth embodiment.

6 is a cross-sectional view of the pressure sensing safety device according to the fifth embodiment.

7 is a sectional view of a pressure sensing safety device according to a conventional example.

<Description of the symbols for the main parts of the drawings>

10: pressure reducer 11: device body

12: through hole 13: operating chamber

14: spring receiving portion 141: spring receiving portion

15: inward seat part 16: stem

17 shearing 18 sealing member

19: spring (pushing stem 16 forward)

191: push spring 20: outer seat

21 hole 22 cover member

23: connector member 24: sealing member

25 gas outlet for the decompression chamber 26 engaging portion

27: engaging member

30: old member in which cover member and connecting part are integrated

31: storage groove 32: push spring

33: torsion spring 34: inner seat packing

35: outer seat packing 36: check valve

N: nozzle (for small gas container)

The present invention is provided with a pressure sensing safety device for a gas container using a small gas container, in particular, a stem which is pushed by the nozzle part when the small gas container is mounted and can retreat the through hole of the mounting body against the spring. In addition, when the internal pressure of the small gas container is abnormally increased, the present invention relates to a pressure sensing safety device that detects the pressure and blocks the passage by the retreating stem.

In the case of a gas appliance using a small gas container, it can be used unexpectedly in some cases, and this causes the small gas container to become abnormally high temperature and, in severe cases, to rupture. There are many safety devices developed to prevent this, but the one disclosed in Japanese Patent No. 2954528 is one typical example. In the case of this invention, as shown in Fig. 7, the check valve a and the stem b of the safety device act in cooperation with each other, but the assembly is performed separately and independently. For this reason, there is a problem that the stem (b) itself and the number of parts related thereto are large, and the number of assembly work is also large.

In addition, when an abnormally elevated pressure acts on the stem (b) and the stem (b) withdraws, a pressure difference occurs on both sides of the sealing portion (d) blocking the inside and outside of the operating chamber. The stem (b) does not automatically return only by operating the member (f) that restrains the pressure. Therefore, when reusing, the operation to return the pressure in the working chamber to the working pressure is required. There is a problem of falling.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to realize the rationalization of a pressure sensing safety device for a gas appliance using a small gas container in accordance with a decrease in the number of parts and a reduction in assembly labor. In addition, an object of the present invention is to provide a pressure-sensitive safety device with good operability that facilitates reuse after the operation of the pressure-sensitive safety device, so-called reset.

In order to solve the above problems, the present invention has a structure in which the piston of the check valve and the shut-off valve is integrated, and also the gas passage is blocked by retreating to detect the abnormal pressure of the small gas cylinder on the stem. To achieve.

Specifically, the present invention is provided with a stem which is pushed by the nozzle part when the small gas container is mounted so that the through-hole of the apparatus body can be retracted against the spring, and when the internal pressure of the small gas container is abnormally increased, A pressure sensing safety device that senses the pressure and allows the stem to retreat to shut off the gas passage. In normal operation, an outer seat is provided to contact the stem by a spring to block the gas passage. The gas passage is provided on the front side of the operating chamber installed in the gas passage, and in case of abnormality, the inner passage part which comes into contact with the stem retracted by the abnormally elevated pressure to shut off the gas passage. Is installed at the rear side of the operating chamber installed in the chamber, and the stem is ejected from the nozzle unit by moving away from the outer seat as the small gas container is mounted. It forms the one configured to be gas outlet chamber by passing through the pressure-operating chamber.

The specific structure of the present invention is provided with a stem for sensing the pressure when the internal pressure of the small gas container is abnormally increased, and the pressure sensing safety device to block the gas passage according to the movement, the stem is a small gas It is constituted by a member penetrating the pressure sensing safety device main body having a hydraulic pressure section receiving internal pressure of the container, and the inside of the through hole of the pressure sensing safety device main body is movable. The outer seat and the inner seat are installed in the operating chamber installed in the gas passage, and the outer seat contacts the stem so as to block the inside and the outside of the operating chamber, and at the same time from the nozzle unit according to the installation of the small gas container. The ejected gas can flow out of the operating chamber, and the inner seat is not in contact with the stem when the stem is retracted when it is abnormal. One will to block the working chamber and out, and further wherein the stem has a configuration restraint member for restraining the retraction system is provided.

In the above invention, the hydraulic pressure portion subjected to the internal pressure of the small gas container may be formed at the front end of the stem or at both front ends of the stem and the rear end of the gas passage.

The stem may be formed by substantially assembling a single member or two or more members.

The stem is to be applied forward from the pressure sensing safety device body, and the force is preferably applied by a spring installed in the gas passage, a spring installed at the rear of the gas passage, or both.

In addition, the stem is hermetically sealed in the through hole of the safety device main body behind the gas passage by a sealing member installed here or by a sealing member attached to the stem, and the combustion gas entering the gas passage. The stem can be retracted under the abnormal pressure of.

In addition, the stem is provided with a sealing member in contact with one side or both sides of the outer seat or the inner seat of the operation chamber formed in the gas passage, or by installing a sealing member in contact with the stem on one side or both sides of the outer seat, the inner seat. It is desirable to perform the sealing completely.

In the present invention, a check valve may be further provided in front of the stem and further forward by the spring from the stem.

Further, the restraining means of the present invention includes a torsion spring which engages with the rear end of the stem and frees the restraint when the stem is retracted to a position in contact with the inner seat, in particular intersecting with the stem. It is preferable to use.

In addition, in the practice of the present invention, the cover member provided with the mounting structure of the small gas cylinder is formed by the front end of the stem, and the connecting member which positions the cover member. It is preferable to provide a nozzle storage portion for forming a hole through which the front end portion can enter and exit, and at the same time pushing the nozzle portion into contact with the nozzle portion when mounting the small gas container.

The pressure sensing safety device for a gas appliance according to the present invention has a stem which is pushed by the nozzle part when the small gas container is mounted so that the through hole of the apparatus body can be retracted, and the internal pressure of the small gas container is abnormally increased. In this case, it is applied to the pressure sensing safety device which senses the pressure and can shut off the gas passage by retreating the stem.

The stem in the present invention is constructed by integrating the piston of the check valve and the shutoff valve in the prior art. The stem is installed through the through hole formed in the pressure sensing safety device body. When the small gas container is mounted, a force is applied to the front side, that is, to the connection port for mounting the small gas container, for example, by means of a spring or the like. This force is required when the small gas container is mounted, but is not necessarily required in the unused state between the small gas container and the disassembled small gas container. The stem also retracts backwards, ie on the opposite side to the splice, upon sensing an abnormally elevated pressure. For this reason, the stem is provided with a hydraulic pressure section which receives the ejection pressure when the internal pressure of the small gas cylinder is abnormally increased. A hydraulic pressure part is mentioned later.

The gas passage as used in the present invention refers to a portion that seals the nozzle portion of the cylinder when the small gas cylinder is mounted, for example, a portion to which a gas differential pressure including an O-ring and a gas outlet to the decompression chamber is applied. . It includes a working room and is wider than the working room. The operating chamber means a space in which a check valve and a shut-off valve are accommodated. A small gas container is used to put gas therein and to flow gas from an outlet to a pressure regulator (generally called a governor). The stem reciprocates. Also in this operation chamber, the direction of the connection port for mounting the small gas container is the outward or front side, and the direction in which the ejected gas flows is called the inward or rear side.

On the front side of the operating chamber, an outer seat is provided which is able to contact the stem and cut off the inside and outside of the operating chamber by applying a force with a spring or the like. This enables the stem to function as a check valve. On the rear side of the operating chamber, when the pressure rises abnormally, an inner seat is provided so as to be in contact with the stem which has been retracted by the pressure, and to block the inside and outside of the operating chamber. The stem thus acts as a shutoff valve and functions as a safety device.

As can be seen here, in the present invention, the action of both the check valve and the shutoff valve is achieved by the movement of one stem. That is, the stem acts as a check valve by contacting the outer seat, and acts as a shutoff valve by contacting the inner seat, and these are replaced as the stem moves. In the state where the small gas container is mounted, the stem moves away from the outer seat, and the gas flows out through the operating chamber to the pressure regulator (the governor) when the internal pressure does not increase abnormally.

Such stems preferably have a substantially single structure. A substantially unitary structure is one in which the check valve and the shutoff valve (which also serve as a stem for reducing pressure) are combined to be treated as a single member. Therefore, it does not matter whether the stem is completely single piece. The single member is preferable in that the number of parts is small, but is not necessarily limited thereto, and may be connected and assembled by a plurality of members, for example, beads.

The stem is configured to move back and forth through the through-hole of the device main body under the internal pressure of the small gas cylinder. For this reason, the hydraulic part which receives the internal pressure of a small gas container is provided in the stem. This hydraulic pressure part is a part which receives the gas pressure blown from the small gas cylinder in relationship with the opening part to the atmosphere of a stem rear end, as can be seen also in the Example mentioned later. Firstly, the hydraulic portion includes the tip of the stem. This also applies to the enlarged part of the stem installed in the gas passage.

The stem is hermetically sealed in the side surface thereof in the through hole at its rear part, and is inserted to move in the through hole. As described above, the rear end of the stem is subjected to atmospheric pressure, while the hydraulic part receives the gas pressure flowing out of the small gas cylinder. Therefore, when the gas pressure ejected from the small gas container with respect to atmospheric pressure becomes abnormally high, the stem moves backward against the spring supporting it. As a result, as described below, part of the stem is in contact with the inner seat of the operating chamber to block the inside and outside of the operating chamber.

Thus, in order to reliably perform the gas blocking action due to the movement of the stem, it is preferable to mount, for example, an O-ring on the stem as a sealing member. In addition, a sealing member such as a packing may be provided on at least one of the outer seat and the inner seat. As shown in the following examples, these sealing means can adopt an appropriate type as necessary.

The stem retracted in the through hole under abnormal internal pressure must be locked in that state. For this purpose, the rear end of the stem is provided with a suitable means, for example a restraining means constituted by a groove deep in the stem and a suitable engagement member inserted therein. It is preferable to set this restraining means as a torsion spring which acts in the cross direction with respect to a stem since it can be reset by the handle operation of a bench gas stove.

In the present invention, a check valve may be further provided in front of the stem, by which a force is applied forward by the spring from the stem. As a result, the shutoff valve acts, whereby when the small gas cylinder is dismantled, it is possible to prevent the gas from flowing out of the operation chamber.

The present invention can achieve the initial object according to the above configuration, and also by the structure of the mounting portion of the small gas cylinder as follows, it is possible to reduce the number of assembly parts of the pressure sensing device of the present invention, furthermore the number of assembly times. That is, the mounting structure of the small gas cylinder is constituted by a cover member installed at the front end of the stem and a connecting member for holding the cover member, and the cover member is formed with a hole at the center thereof so that the front end of the stem can enter and exit. At the same time, there is provided a nozzle storage portion that comes in contact with the nozzle portion when the small gas container is mounted. One example of the specific structure is shown in Example 1. In addition, the structure of the mounting portion of the small gas cylinder is not limited to penetrating not only the pressure sensing device of the present invention but also the pressure sensing device main body of the small gas cylinder, and includes only the so-called check valve stem. In addition, the inner surface of the cover member is provided with a seat of the check valve, and if necessary, the O-ring for sealing the nozzle and the nozzle portion of the small gas cylinder is arranged.

In addition, the mounting structure of the small gas cylinder is provided with a nozzle storing portion for forming a hole through which the front end portion of the stem can enter and exit at the center, and pushing the nozzle portion in contact with the nozzle when the small gas container is mounted around the hole. You may. According to this type, since the cover member and the connection port member are integrated as compared with the above case, the number of parts is reduced and the number of assembly labor is reduced.

Example

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings.

(Example 1)

1 and 2 show cross-sectional views of a pressure reducer 10 and a so-called governor equipped with a pressure sensing safety device according to a first embodiment of the present invention. The apparatus main body 11 of the present invention is provided in conjunction with the pressure reducer 10 and integrally formed therewith. Through-holes 12 are formed in the main body 11, and an operating chamber 13 having a distribution port 25 leading to the decompression chamber is provided in the first half portion thereof. In addition, the stem 16 penetrates the through hole from its front end to its rear end. In this embodiment, the innermost portion of the operating chamber 13 is provided with a spring receiving portion 14, the push spring 19 provided thereon is to force the stem 16 forward.

The stem 16 is an axial member arranged to be axially flowable in the through hole 12 and extends from one end to the other end of the through hole 12. This stem 16 has the front end 17 pushed by the nozzle part N of a small gas container. It also has a large diameter portion near the front end portion, and a 0-ring is mounted as the sealing member 18 on the outer circumference of the large diameter portion.

The stem 16 is pushed forward by the push spring 19 provided in the spring receiving portion 14. That is, the stem 16 is provided with a push spring 19 between the stem large diameter portion on which the sealing member 18 is mounted and the main body of the innermost part of the gas passage, and the stem 16 is connected to the push spring ( It is pushed forward by 19). The push spring 19 is weaker than the spring embedded in the nozzle portion N of the small gas container, and after the abnormal rise in the internal pressure, the small gas container is disassembled to release the stem 16 from the stem 16. Has the strength to return to the win position.

The second half of the stem has an outer diameter slightly smaller than the inner diameter of the through hole, and is arranged to be slidable in the through hole 12. In addition, the sealing member 24 is arrange | positioned in a part of the through-hole which this stem 16 slides, and airtight is hold | maintained. As a result, the stem 13 can be retracted by the gas pressure applied to the front end of the stem 16.

The operating chamber 13 is located in the first half of the through hole 12 formed in the main body 11 as described above. This operating chamber 13 is provided with the expansion part which has the inclined surface which forms a taper toward the inside, and the inner seat part is set in the taper inclined surface of the expansion part. When the stem 16 retreats to this inner seat 15, the large diameter part is contacted through the sealing member 18, and it acts as a shutoff valve. On the other hand, the outer seat part 20 is provided in front of the operation chamber 13. Specifically, it is provided on the inner surface of the cover member 22 provided at the front end 17 of the stem 16. The outer seat portion 20 receives the force from the push spring by the push spring, and when the stem is in the home position, the large diameter portion is brought into contact with the sealing member 18 to act as a check valve.

In addition, the cover member 22 has a hole 21 that can be moved in and out of the center thereof, and the nozzle member N is brought into contact with and pushed in when the small gas container is mounted. The cover member 22 used in the present embodiment is a press-formed metal component, which is configured to be placed inside the connector member 23. The cover member 22 can also be replaced by a resin molded article.

The outer seat 20 defines the home position of the stem 16. The original position of this stem is the position when the stem 16 is in a state where a force is applied forward by the spring 19, and as a reference of the stem position before the gas safety is mounted on the pressure safety device, In this position, the stem front end 17 protrudes outward from the hole 21 (upper half in Fig. 1).

The stem 16 has an engaging portion 26 at its rear end. The engaging portion 26 is configured to restrain the axial movement of the stem 16 by engaging the restraining member 27 therewith. The restraining member 27 is forced by the spring in the engagement direction, for example, and can release the restraint of the stem 16 to the reset state by releasing the engagement against the spring. The method of operating the restraint member 27 can be any method, such as a method of directly operating or a method of operating with a handle in charge of ignition and fire of the gas appliance.

The operation of Example 1 above is as described below.

In the state before use (before the small gas cylinder is mounted) shown in the upper half of Fig. 1, the pressure between the outside and the inside of the sealing member 18 is almost balanced, and the nozzle portion N of the small gas container is connected to the connection port. If it fits in, the front end 17 of the stem 16 is pushed in from the nozzle tip, so that the sealing member 18 is moved inward from the outer seat 20. On the other hand, even in the small gas mechanism, the nozzle part N Pushed by the cover member 22, the valve is opened. As a result, as shown in FIG. 2, the ejected gas flows out into the cover member, and passes through the clearance between the outer seat portion 20 and the inner seat portion 15 and the stem 16 in the operation chamber 13, and the outlet passage 25 Flows into the hydraulic chamber. As a result, when the mechanism column is open, the gas adjusted by the diaphragm is allowed to flow into the burner or the like.

When the internal pressure of the small gas container rises abnormally, the stem 16 receives the force from the hydraulic pressure section. When the force is in the state of overcoming the push spring 19, the stem 16 is retracted, the sealing member 18 is in contact with the inner seat 15, the operating chamber 13 is cut off from one side of the governor Becomes At the same time, since the restraining member 27 is engaged with the stem engaging portion 26, the blocking state is maintained, and the gas cannot be sent to the burner or the like and the combustion is stopped. In addition, in accordance with this operation, the large diameter portion is blocked more reliably by the internal pressure of the small gas container.

In this state, the sealing member 18 of the stem 16 moves away from the outer seat 20. Therefore, in the case of dismantling an abnormally small gas container, the pressure upstream of the sealing member 18 becomes atmospheric, and the downstream pressure also becomes atmospheric by balance of the remaining gas discharge. Therefore, when the restraint member 29 is released, the stem 16 returns to its original position by the push spring 19, and can be used continuously by mounting a normal small gas container.

(Example 2)

3 is a cross-sectional view showing a pressure reducer 10 equipped with a pressure sensing safety device according to a second embodiment of the present invention in the same manner as in the first embodiment. In the second embodiment, the receiving groove 31 is formed around the middle of the stem 16 to mount the inner sealing member 24, and the force is applied forward to the stem by the push spring 32 from the rear of the outer wall. Is adding. In this structure, the operating room side of the outer wall of the accommodating groove 31 also becomes a hydraulic pressure unit, and has a structure for easily detecting an abnormal pressure of the small gas cylinder as compared with the first embodiment.

In addition, in the second embodiment, the cover member 22 and the connector member 23 shown in the first embodiment are integrated to form a single spherical member 30. Therefore, the outer seat part 20 is formed in the said detention material. Accordingly, there is an advantage that the number of parts can be reduced and the number of assembly operations can be reduced while having the same basic functions as those of the first embodiment. In particular, the spherical member 30 and the stem 16 have a shape structure that can be manufactured by die-casting molding, so that the apparatus main body 11 is die casting molding from the original. Therefore, since the main part which is all three points can be manufactured by metal mold | die shaping | molding, the assembly of a pressure sensing safety device and even a governor becomes much easier. In addition, the integration of the cover member and the connection member can be applied in various embodiments including the case of the first embodiment.

Further, in the case of the second embodiment, the stem 16 is directly restrained by a torsion spring 33 which acts in the opposite direction to the direction of movement thereof. Also in this respect, although it is different from Example 1, this can be applied to various embodiment including the case of Example 1, of course. As described above, the configuration according to the second embodiment is different from that of the first embodiment. However, other configurations are basically the same as those of the first embodiment, and produce the same effects. Therefore, the same reference numerals as in Example 1 are used in FIG. 3, and a detailed description thereof will be omitted.

(Example 3)

4 is a cross-sectional view showing the same as the first embodiment of the damper 10 equipped with a pressure-sensitive safety device according to a third embodiment of the present invention. In this third embodiment, the push spring 19 is provided in the operating chamber 13 in the same manner as in the first embodiment, but additionally, the spring receiving portion is provided behind the sealing member 24 provided in the through hole in which the stem 16 slides. The part 141 is provided, and the said push spring 191 is made to apply a force to the stem 16 forward. That is, in Example 1 shown in FIG. 1, the function of the push spring 19 is divided into the check valve push spring 19 and the shutoff valve push spring 191. FIG. In this way, the check valve can be operated more smoothly. In other respects, it is the same as in the first embodiment.

(Example 4)

5 is a cross-sectional view showing a pressure reducer 10 equipped with a pressure sensing device according to a fourth embodiment of the present invention in the same manner as in the first embodiment. In the fourth embodiment, the configuration is basically the same as that of the first embodiment, but the packings 34 and 35 are provided as sealing members in the outer seat 20 and the inner seat 15 in the operating chamber 13, respectively. ) Is attached. By doing in this way, the gas at the time of the stem 16 contacting the inner seat part 20 and the outer seat part 15 can be reliably cut off. In addition, it is possible to reduce the assembly labor of the stem by omitting the sealing member 18 installed on the stem side. The packings 34 and 35 may be attached to the outer seat 20 and the inner seat 15, and may be replaced by one common packing.

(Example 5)

In Example 5, as shown in FIG. 6, the check valve 36 which the force applied to the front by the spring from this stem is further provided in front of the stem 16. As shown in FIG. Accordingly, when the shutoff valve according to the device of the present invention is operated and the small gas cylinder is dismantled, it is possible to completely prevent an accident such that the combustion gas in the operation chamber flows backward due to flashing. In addition, in this case, since the pressure difference occurs in and out of the outer seat 20, the stem 16 cannot be returned to its original position simply by releasing the restraining member 27, and after digestion, a cylinder of normal pressure is set. After that, there is a hassle to release the restraining member again, but can continue to act in the state equipped with the basic functions of the present invention.

As mentioned above, although embodiment of this invention was described according to the Example, this invention can be implemented also in various forms other than the said Example. For example, the sealing member which contact | connects an outer side seat part and an inner side seat part can also be separately provided in a stem, respectively. In addition, the operation chamber may be divided into a front part and a rear part connected by gas passages, and the front part may function as a check valve and a rear part as a shutoff valve. These modifications can be made freely without departing from the technical spirit thereof.

The present invention is configured and acted as described above, the reduction of the number of parts and the number of assembly required for the assembly of the pressure-sensitive safety device is realized, it is possible to reduce the cost. In addition, when the pressure sensing safety device is operated, since the check valve is open, the pressure difference does not occur before and after the inner seat, so as soon as the abnormal rise of pressure is resolved, the spring can be reset immediately. The advantage is that if the miniature bomber is removed after the device is in operation, the reset operation can be performed immediately without pushing the stem back.

Claims (12)

delete A pressure sensing safety device having a stem for detecting the pressure when the internal pressure of the small gas container rises abnormally and blocking the gas passage in accordance with the movement thereof. The stem is constituted by a member having a large diameter portion that serves as a check valve and a shut-off valve through a pressure sensing safety device body having a hydraulic pressure portion receiving internal pressure of a small gas container. It can slide inside the through hole of the safety device body, In the working chamber provided in the gas passage, an outer seat portion and an inner seat portion contacting the large diameter portion of the stem are provided. The outer seat portion has a stem. When it is in the home position, the large diameter portion of the stem can be contacted to block the inside and outside of the operating chamber, and at the same time, the gas ejected from the nozzle portion can flow out of the operating chamber according to the installation of the small gas container.內 方 座 部 is to be able to block the inside and outside of the operating room in contact with the stem when the stem retracts when abnormal, And the stem is provided with a restraining member which engages with the rear end of the stem and is a restraining material when the stem is retracted to a position where the stem contacts the inner seat . 3. The pressure sensing safety device according to claim 2, wherein the hydraulic pressure portion receiving the internal pressure of the small gas container is formed at both the front end of the stem and the rear end of the gas passage. delete The pressure sensing safety device according to claim 3, wherein the stem is exerted forward from the pressure sensing safety device main body. The pressure sensing safety device according to claim 5, wherein the force of the stem is applied by a spring installed in the gas passage, a spring installed at the rear of the gas passage, or both. 3. The pressure according to claim 2, wherein the stem is hermetically sealed by a sealing member provided in the through hole of the safety device main body behind the gas passage, or by a sealing member attached to the stem. Detection safety device. delete delete delete delete  And a cover member provided at the front end of the stem and a connecting member for positioning the cover member. The cover member is formed with a hole through which the front end of the stem can enter and exit, and at the same time, a small gas container. Attachment structure of a small gas cylinder comprising a nozzle housing for contacting the nozzle unit when the mounting of the nozzle.

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