KR101135061B1 - A Valve socket for preventing leakage out containing a ring shape protecting cap and a manufacturing method thereof - Google Patents

Abstract

The present invention relates to an airtight valve valve provided with an annular protective cap and a method for manufacturing the same, and more particularly, to provide an O-ring for maintaining airtightness between a metal inner socket and a synthetic resin injected into the outer surface thereof. The present invention relates to an airtight valve socket to secure the function of an O-ring used for airtightness by minimizing the shape deformation or the characteristic change of the O-ring with long term use.
In the valve socket of the present invention, at least one inlet 110a and the outlet 110b are formed in the airtight valve socket 500, the inlet port 110a and the outlet port 110b are coupled to the pipe port (D). A metal inner socket 100 having a connection portion 120 formed thereon so as to be provided; An O-ring (200) installed on one outer circumferential surface of the inner socket (100); The protruding portion 310 protruding to be inserted into the inner space of the inner socket 100 generated by the O-ring 200 and the shape of the O-ring 200 are connected to the O-ring 200. An annular protective cap 300 provided with a receiving portion 320 to receive; And the inner ring 100, the O-ring 200 and the body 400 made of a synthetic resin that is injection molded on the annular protective cap 300 to form an appearance; 300 provides an airtight valve socket 500 having an annular protective cap 300 which maintains airtight by fixing the shape and position of the O-ring 200.
In addition, according to the manufacturing method of the valve socket of the present invention, in the manufacturing method of the airtight valve socket is formed in the inlet and outlet, forming a metal inner socket formed with a connecting portion to be coupled to the inlet and the outlet. Step S1; Attaching an O-ring to one outer circumferential surface of the metal inner socket (S2); Forming and engaging an annular protective cap provided with a protrusion projecting to be inserted into the inner space of the inner socket generated by the O-ring, and a receiving portion accommodating the shape of the O-ring to accommodate the O-ring Step S3; And injecting molten synthetic resin onto the inner socket, the O-ring, and the annular protective cap to complete the valve socket (S4). It provides a manufacturing method of the airtight valve socket is provided with an annular protective cap configured to include.

Description

A valve socket for preventing leakage out containing a ring shape protecting cap and a manufacturing method

The present invention relates to an airtight valve valve provided with an annular protective cap and a method for manufacturing the same, and more particularly, to provide an O-ring for maintaining airtightness between a metal inner socket and a synthetic resin injected into the outer surface thereof. The present invention relates to an airtight valve socket to secure the function of an O-ring used for airtightness by minimizing the shape deformation or the characteristic change of the O-ring with long term use.

In many industries, valve sockets are used to connect pipes and pipes or to other pipes for supplying fluids such as gas or liquid to demand.

For example, the piping structure branching from the faucet buried in the wall is installed in various pipe directions of cold water or hot water depending on the internal structure, the width, or the purpose of the building, and if the pipe needs to be extended further, It is used by combining a separate valve socket connecting pipes.

The valve socket is generally used as a coupler for connecting the pipe and the pipe, and when used in conjunction with the receiving box, the inlet pipe is connected to the inlet and outlet of the cold and hot water to one side, and the water outlet of each cold and hot water destination is connected to the other side. It is used.

These valve sockets are generally made of metal such as brass, which has higher strength than synthetic resins and has high heat resistance and corrosion resistance.

However, since the valve socket of the above metal material is much higher than synthetic resin and the processing cost is high, it is not proper to manufacture all the valve sockets from metal unless it is a special case.

In order to compensate for the above problems, parts that do not require strong fastening force or strength may be made of synthetic resin, and only the connection part with the pipe port requiring stronger fastening force or strength may be manufactured as a separate metal inner socket. In the art it is usually referred to as nipple.

Hereinafter, the structure of a conventional valve socket will be described with reference to FIG.

The conventional valve socket shown in FIG. 1 illustrates that a faucet (faucet) and a pipe are coupled to one side and the other side thereof.

As shown in FIG. 1, the conventional valve socket has an outer injection into a synthetic resin and an inner metal inner socket 1 therein.

The valve socket 5 has an inner socket 1 made of a metallic material such as brass therein, and the outside is a synthetic resin 4, so that the valve socket 5 surrounds the metal inner socket 1 and the synthetic resin 4 and the metal material. The inner socket 1 is in a deadlocked state.

By the above configuration, one side of the valve socket 5 is coupled to the piping port (D) in which the cold and hot water flows in and out.

The valve socket 5 is made of a metal inner socket (1) only the portion that needs to be connected to the other pipe port (D), and the other parts are injected into the synthetic resin to surround the metal inner socket (1) Compared to the case of manufacturing the entire valve socket 5 made of metal, it does not require post-processing, and the raw material cost is relatively reduced, which has the advantage of significantly lowering the unit cost of the product.

However, when the synthetic resin 4 is injected into the metallic inner socket 1, the metal and the synthetic resin 4 are different release materials having different thermal expansion coefficients and / or shrinkage ratios, so that the metal and the synthetic resin 4 may evolve over time. There is a problem that cracks or spacing occurs between the water leakage occurs between the synthetic resin (4) and the metal inner socket (1).

In addition, when the valve socket 5 is used for a long time, the interlocking property between the synthetic resin 4 and the metal inner socket 1 gradually decreases due to shrinkage and expansion due to water pressure or temperature difference of cold and hot water, thereby causing leakage. Occurs.

In addition, even when a leak-proof O-ring is attached to one end of the metal inner socket 1, the torsion or excessive tightening force when the pipe port D is coupled to the metal inner socket 1 may cause damage. There is a problem that the O-ring's airtightness is significantly reduced even when the O-ring is deformed or the chemical reaction with the leaked fluid occurs.

The present invention has been made to solve the above problems and technical biases, and provides a valve socket and a method of manufacturing the same to prevent leaks occurring between the metal inner socket and the synthetic resin injected into the outer surface to maintain a more airtight. It is for that purpose.

In addition, the airtight valve socket according to the present invention is provided with an O-ring for securing the airtightness between the metal inner socket and the synthetic resin, the shape of the O-ring to ensure that the O-ring to perform the airtight function It is an object of the present invention to provide a valve socket capable of fixing a position and a method of manufacturing the same.

In order to achieve the above object, the present invention, in the one or more inlet and outlet for the airtight valve valve is formed, the metal inner socket is formed with a connecting portion to be coupled to the inlet and outlet; An O-ring installed at one outer circumferential surface of the inner socket; An annular protective cap conforming to the shape of the O-ring and accommodating the O-ring in close contact; And a body made of a synthetic resin that is injection molded on the inner socket, the O-ring, and the annular protective cap to form an appearance, such that the annular protective cap is sealed by fixing the shape and position of the O-ring. It provides an airtight valve socket is provided with an annular protective cap.

In this case, the annular protective cap 300 is in contact with the inner circumferential surface of the O-ring 200 and protruding portion 310 protruding to be inserted into the inner space of the inner socket 100 generated by the O-ring 200 ), And an accommodation part 320 in which the O-ring is received in close contact with the outer surface of the protrusion 310.

In this case, the protruding portion of the annular protective cap is composed of a plurality of engaging projections, the locking jaw to the engaging projection of the annular protective cap may be further formed on the inner peripheral surface of the metal inner socket.

In addition, the protruding portion of the annular protective cap is composed of a plurality of engaging projections, one end of the metal inner socket is matched with the inner diameter of the O- ring so that the O-ring is mounted and raised from one end of the metal inner socket The O-ring holder may be further provided, and a locking jaw may be formed on the inner surface of the O-ring holder so that the locking protrusion of the annular protective cap is caught.

In addition, the outer periphery of the metal inner socket may be further formed with a nuring for strengthening the adhesion with the body.

At this time, the body is not limited to a special material as long as it is a synthetic resin material that can be injection molded, such as PB, PC, PPR, nylon, urethane or ABS.

In addition, the body, and one reference flow path; It may be composed of one or more bending flow passages bent from the reference flow path.

According to another aspect of the present invention, there is provided a method for manufacturing a hermetic valve socket having an inlet and an outlet formed therein, the step of forming a metal inner socket with a connection portion is formed so that the pipe can be coupled to the inlet and outlet (S1) )Wow; Attaching an O-ring to one outer circumferential surface of the metal inner socket (S2); Forming an annular protective cap to match the shape of the O-ring so as to receive the O-ring in close contact with each other (S3); And injecting molten synthetic resin onto the inner socket, the O-ring, and the annular protective cap to complete the valve socket (S4). It provides a manufacturing method of the airtight valve socket is provided with an annular protective cap configured to include.

In this case, the annular protective cap abuts on the inner circumferential surface of the O-ring 200 and protruding portion 310 protruding to be inserted into the inner space of the inner socket 100 generated by the O-ring 200, and The outer surface of the protrusion 310 may be molded and combined to have a receiving portion 320 to be received in close contact with the O-ring.

At this time, the step of forming the metal inner socket (S1) further comprises the step of forming a locking jaw on the inner peripheral surface of the metal inner socket, the step of forming the annular protective cap (S3) is the inner peripheral surface of the metal inner socket The protruding portion of the annular protective cap may be formed of a plurality of locking projections so as to be caught by the locking projections formed in the locking projections.

In addition, the step of forming the metal inner socket (S1) corresponds to the inner diameter of the O-ring so that the O-ring is mounted on one end of the metal inner socket and raised from one end of the metal inner socket. And forming a ring jaw on the inner surface of the O-ring holder, and forming the annular protective cap (S3) comprises: forming the ring holder on the inner surface of the metal inner socket. The method may further include forming the protrusion of the annular protective cap into a plurality of locking protrusions so as to be caught by the locking jaw.

Even in this case, the synthetic resin of the body is not limited to a special material as long as it can be injection molded such as PB, PPR, nylon, urethane or ABS.

According to the airtight valve valve of the present invention having the configuration as described above, the synthetic resin is injected into the metal inner socket can not only significantly lower the material cost, but also made of metal inner socket and synthetic resin that can occur over time There is an effect that can significantly prevent leakage due to cracks or separation between the body.

In addition, by maintaining the position and characteristics of the O-ring installed in the metal inner socket at all times there is an effect that can prevent the leakage of fluid, such as gas or liquid due to the deterioration of the O-ring.

Figure 1 is a sectional view of the main part showing a state in which a conventional valve socket is used.
Figure 2 is a perspective view showing the appearance of the valve socket according to an embodiment of the present invention.
Figure 3 is an exploded perspective view showing the coupling relationship between the rest of the configuration except the body made of synthetic resin to form the appearance.
4 is a cross-sectional view of the valve socket according to the present embodiment.
5 is a cross-sectional view of the valve socket according to another embodiment of the present invention.
6 is a flowchart illustrating a method of manufacturing a valve socket according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The present embodiments and drawings are intended to assist the understanding of the present invention and are not intended to limit the scope of the invention in any way.

The airtight valve socket of the present invention is connected in a gastight state to a pipe in which gas (air, hydrogen, oxygen, gas, etc.) or a liquid (for example, "cold and hot water of a faucet") flows. It is to be allowed to flow out through a valve or a power outlet in each application, and if it is connected to the pipe is required to be airtight, it is not limited to a specific use.

The following description and drawings are merely described as an example that the water outlet is installed in the airtight valve socket of the present invention as described above is not necessarily limited to this purpose.

Figure 2 is a perspective view showing the appearance of the valve socket according to an embodiment of the present invention.

The valve socket of FIG. 2 includes a metal inner socket 100 having one inlet and an outlet formed therein, and a connection portion for allowing a pipe port to be coupled to the inlet and the outlet; An O-ring (200, not shown in FIG. 2) installed on an outer circumferential surface of the inner socket 100; The protruding portion 310 protruding to be inserted into the inner space of the inner socket 100 generated by the O-ring 200 and the shape of the O-ring 200 are connected to the O-ring 200. An annular protective cap (300, not shown in FIG. 2) provided with a receiving portion (320) for receiving; And a body 400 made of a synthetic resin that is injection molded on the inner socket 100, the O-ring 200, and the annular protective cap 300 to form an appearance.

The valve socket shown in Fig. 2 is not significantly different from the conventional valve socket in appearance, but is clearly distinguished in structure and function in the internal structure to be described below.

3 and 4 will be described in more detail with respect to the internal structure of the valve socket according to an embodiment of the present invention.

Figure 3 is an exploded perspective view showing a coupling relationship between the rest of the configuration except the body 400 made of synthetic resin to form the appearance, Figure 4 is a cross-sectional view of the valve socket according to the present embodiment.

3 is an exploded perspective view of a brass inner socket 100 having one inlet port 110a and one outlet port 110b and formed with an O-ring holder 150 raised at an end in the inlet port 110a direction; An O-ring 200 inserted into the O-ring holder 150 such that an inner diameter thereof is in contact with the O-ring holder 150; And an annular protective cap having a protruding portion 310 inserted into the inside of the O-ring holder 150 while the O-ring is inserted therein, and a receiving portion 320 formed of a flat surface to accommodate the O-ring. 300).

In the inner socket 100 of the valve socket of FIG. 3 according to the present embodiment, an O-ring holder 150 is used in which an O-ring is raised by being raised at one end thereof, which is an initial position of the O-ring 200. It is not necessarily necessary as a configuration for easily fixing the, and the O-ring 200 may be placed on the outer circumference of the inlet 110a of the inner socket 100.

In addition, although FIG. 3 illustrates that the O-ring 200 is settled in the flat plate formed between the O-ring holder 150 and the jaw formed at the outer diameter of the inner socket 100, the outer diameter of the inner socket 100 may be lowered. The formed jaw is not an essential configuration and is only an option.

That is, the role of fixing the position of the O-ring is responsible for the annular protective cap 300 to be described below.

The annular protective cap 300 shown in Figure 3 serves to fix the position of the O-ring.

The annular protective cap 300 of Figure 3, the protrusion 310 is formed to be inserted into the inner space of the O-ring holder 150 of the inner socket 100, the protrusion 310 is the inner socket When inserted into the interior of the 100, there is provided a receiving portion 320 to receive the O-ring.

The annular protective cap 300 of the valve socket shown in FIGS. 3 and 4 is in contact with the inner circumferential surface of the O-ring and corresponds to the shape of the protrusion 310 and the O-ring inserted into the inner space created by the O-ring. -Includes a receiving portion 320 for receiving the ring 200, but this is only an example according to a preferred embodiment for fixing the position of the O-ring 200, the annular protective cap 300 as a core used in injection If the O-ring 200 can be firmly coupled to the inner socket 100 by pushing), the protrusions 310 and the receiving portion 320 may be omitted.

The protrusion 310 of FIG. 3 is formed of four locking protrusions 311. The distal end of the upper locking projection 311 is formed of an arrow-shaped projection to be caught by the locking step 111 is provided on the inner surface of the inner socket 100.

Therefore, the front surface of the O-ring is in contact with the receiving portion 320, the protrusion 310 is inserted into the inner space without directly contacting the O-ring 200.

As such, since the position of the O-ring is firmly fixed by the annular protective cap 300, the problem of torsion, chemical deformation or positional deviation that the O-ring 200 receives is solved, and thus, the inner metal socket 100 and the synthetic resin It is to be able to solve the problem of leakage that can occur between the body 400.

According to Figure 4, it is possible to more clearly understand the internal structure of the valve socket according to this embodiment.

The valve socket according to the present embodiment illustrated in FIG. 4 includes a metal inner socket 100 having a connection part 120 formed thereon so that a pipe hole D may be coupled to the inlet port 110a and the outlet port 110b; An O-ring 200 installed at one outer circumferential surface of the inner socket 100 (more precisely, an O-ring holder 150 raised from one end of the inner socket); The protrusion 310 protruding to be inserted into the inner space of the inner socket 100 (more accurately, is inserted along the inner surface of the O-ring holder 150), and the shape of the O-ring 200. An annular protective cap (300) having a receiving portion (320) adapted to receive the O-ring (200); And a body 400 made of a synthetic resin that is injection molded on the inner socket 100, the O-ring 200, and the annular protective cap 300 to form an appearance.

At this time, the protruding portion 310 of the annular protective cap 300 is composed of four engaging projections 311, the inner peripheral surface of the O-ring holder 150 of the metal inner socket 100 is the annular protective cap A locking step 111 is formed to engage the locking protrusion 311 of the 300.

In the case of Figure 4, the power outlet is coupled to the outlet 110b side of the right side, and the pipe branched from the distributor is coupled to the inlet port 110a side of the left side.

In addition, in the case of FIG. 4, the upper O-ring is shown to span the O-ring holder 150, but is placed at the end of the inner socket 100 without the O-ring holder 150 and the annular protective cap ( As described above, the locking step 111 may be formed on the inner circumferential surface of the inner socket 100 to which the locking protrusion 311 of the protrusion 310 of the 300 is caught.

3 and 4, an O-ring 200 is installed on one side of the inner socket 100 to maintain airtightness, and the position or shape of the O-ring 200 is annular protective cap 300. ) Can be kept intact to prevent leakage that may occur between the metal inner socket 100 and the main body 400 which is a synthetic resin.

5 is a cross-sectional view of the valve socket according to another embodiment of the present invention.

The valve socket of Figure 5, the body 400 is made of synthetic resin and one reference passage 410; Consists of three bending passages 420 communicated from the reference passage 410, each of the bending passages 420, the inner socket 100, the O-ring and the annular protective cap 300 of Figs. Except that is provided with) is not different from the valve socket of Figures 2 to 4, duplicate description thereof will be omitted.

5 shows only one example in which the valve socket of the present invention can be formed, and the specific shape of the body 400 can be modified in various forms.

6 is a flowchart illustrating a method of manufacturing a valve socket according to an embodiment of the present invention.

6 is a view illustrating a method of manufacturing a valve socket according to an embodiment of the present invention, comprising: forming a metal inner socket in which a connection part for coupling a pipe hole to an inlet and an outlet is formed (S1); Attaching an O-ring to one outer circumferential surface of the metal inner socket (S2); Forming and engaging an annular protective cap provided with a protrusion projecting to be inserted into the inner space of the inner socket generated by the O-ring, and a receiving portion accommodating the shape of the O-ring to accommodate the O-ring Step S3; And injecting molten synthetic resin onto the inner socket, the O-ring, and the annular protective cap to complete the valve socket (S4). It is configured to include.

In the manufacturing method of the valve socket according to the present embodiment, the annular protective cap 300 is in contact with the inner circumferential surface of the O-ring to match the shape of the protrusion 310 and the O-ring inserted into the inner space generated by the O-ring. Was manufactured to include the receiving portion 320 for receiving the O-ring 200, but this is only an example according to a preferred embodiment for fixing the position of the O-ring 200, ring protection to the core used during injection As long as the O-ring 200 can be firmly coupled to the inner socket 100 by pushing the cap 300, the process of forming the upper protrusion 310 and the receiving part 320 may be omitted.

In this case, the inner socket may be made of brass and / or stainless, and may be attached to an outer circumferential surface of one side of the inner socket, and the O-ring may be formed by forming an raised O-ring holder from one end of the inner socket. It can also be mounted.

In addition, the protruding portion of the annular protective cap 300 is manufactured to be inserted into the inner socket, but is inserted along the inner surface of the O-ring holder, so that the protrusion is caught by the locking jaw provided on the inner surface of the O-ring holder. You may.

That is, the step of forming the metallic inner socket (S1) further comprises the step of forming a locking jaw on the inner peripheral surface of the metallic inner socket, the step of forming the annular protective cap (S3) is the inner peripheral surface of the metallic inner socket The protrusion of the annular protective cap to be formed into a plurality of locking projections to be caught on the locking step formed in the.

In addition, the step (S1) of forming the metal inner socket corresponds to the inner diameter of the O-ring so that the O-ring is mounted on one end of the metal inner socket and is raised from one end of the metal inner socket. Forming an O-ring holder and forming a locking jaw on the inner surface of the O-ring holder, Forming the annular protective cap (S3) is on the inner surface of the O-fixture of the metal inner socket The method may further include forming the protrusion of the annular protective cap into a plurality of locking protrusions so as to be caught by the locking jaw formed therein.

As described so far, the airtight valve socket 500 of the present invention is in contact with the gas or liquid over a long period of time under various use conditions due to the characteristics that should be used for a long time in one installation. ), Even if the adhesive force between the main body 400 of the synthetic resin is deteriorated to cause leakage due to cracking or separation, the airtightness can be maintained by maintaining the shape and position of the O-ring attached to the metal inner socket 100. It has an effect.

As mentioned above, although this invention was demonstrated through the preferable Example, this is an objective to help understanding of this invention and is not intended to limit the technical scope of this invention to this.

Those skilled in the art will appreciate that various modifications and variations can be made without departing from the spirit of the present invention.

For example, the shape of the valve socket 500 and the coupling method of the connecting portion 120, the use of the valve socket 500, the shape and number of the O-ring 200, the shape of the inlet and / or outlet The number and the like cannot be used as a criterion for determining the technical scope of the present invention, but can only be determined by the claims.

100: inner socket 110a: inlet
110b: outlet 111: locking jaw
120: connection 150: O-ring holder
200: O-ring 300: ring protection cap
310: protrusion 311: locking protrusion
320: receiving portion 400: body
410: reference euro 420: bending euro

Claims (10)

In the airtight valve socket 500 having one or more inlets 110a and outlets 110b formed therein,
A metal inner socket (100) having a connection portion (120) formed to allow the pipe port (D) to be coupled to the inlet (110a) and the outlet (110b);
An O-ring (200) installed on one outer circumferential surface of the inner socket (100);
A protrusion 310 abutting on an inner circumferential surface of the O-ring 200 and protruding to be inserted into an inner space of the inner socket 100 generated by the O-ring 200 and the O-ring 200. An annular protective cap 300 conforming to a shape and including an accommodating part 320 in which the O-ring is tightly received on an outer surface of the protrusion 310; And
The inner socket 100, the O-ring 200 and the annular protective cap 300 by being injection molded on the annular protective cap 300 to form a synthetic resin body to form an appearance; Airtight valve valve 500 having an annular protective cap 300, characterized in that to maintain the airtight to fix the shape and position of the O-ring (200). delete The method of claim 1,
The protruding portion 310 of the annular protective cap 300 is composed of a plurality of engaging projections 311, the engaging projection 311 of the annular protective cap 300 is formed on the inner circumferential surface of the metal inner socket 100; Hermetic valve socket with an annular protective cap, characterized in that the locking step 111 is further formed to catch. The method of claim 1,
The protruding portion 310 of the annular protective cap 300 is composed of a plurality of engaging projections 311, the O-ring 200 is mounted on one end of the metal inner socket 100 O-ring holder 150 is further provided to match the inner diameter of the 200 and raised from one end of the metal inner socket 100, so that the engaging projection 311 of the annular protective cap 300 is caught. The airtight valve socket with an annular protective cap, characterized in that the locking step 111 is formed on the inner surface of the O-ring holder 150. The method according to any one of claims 1, 3, and 4,
At the outer circumference of the metal inner socket 100, the valve socket for the airtight maintenance valve provided with an annular protective cap, characterized in that the kneading for strengthening the adhesion with the body 400 is further formed. The method according to any one of claims 1, 3, and 4,
The body 400, one reference passage 410 and; Hermetic valve socket having an annular protective cap, characterized in that consisting of at least one bending passage 420 communicated from the reference passage (410). In the manufacturing method of the airtight valve socket formed in the inlet and outlet,
Forming a metal inner socket in which a connection part is formed so as to allow the pipe port to be coupled to the inlet port and the outlet port (S1);
Attaching an O-ring to one outer circumferential surface of the metal inner socket (S2);
A protrusion 310 abutting on an inner circumferential surface of the O-ring 200 and protruding to be inserted into an inner space of the inner socket 100 generated by the O-ring 200 and the O-ring 200. Forming an annular protective cap having an accommodating part 320 to be received in close contact with the shape so as to receive the O-ring in close contact with the outer surface of the protruding part 310 (S3); And
Injecting a molten synthetic resin on the inner socket, the O-ring and the annular protective cap to complete the valve socket (S4); Method of manufacturing a valve socket for airtight maintenance provided with an annular protective cap configured to include. delete The method of claim 7, wherein
Forming the metal inner socket (S1) further comprises the step of forming a locking step on the inner peripheral surface of the metal inner socket,
The step of forming the annular protective cap (S3) is an airtight provided with an annular protective cap, characterized in that for forming the projections of the annular protective cap with a plurality of engaging projections to be caught on the engaging jaw formed on the inner circumferential surface of the metal inner socket; Method for manufacturing a retaining valve socket. The method according to claim 7 or 9,
Forming the metal inner socket (S1) is an O-ring fixture that matches the inner diameter of the O-ring so that the O-ring is mounted at one end of the metal inner socket and is raised from one end of the metal inner socket. And forming a locking jaw on the inner surface of the O-ring holder,
Forming the annular protective cap (S3) further comprises the step of forming the projections of the annular protective cap into a plurality of engaging projections to be caught by the engaging jaw formed on the inner surface of the O-ring holder of the metal inner socket. Method for producing a valve for the airtight maintenance valve provided with an annular protective cap, characterized in that.

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