KR20090109715A - Service Valve for Air Conditioning System - Google Patents

Abstract

PURPOSE: A service valve for an air conditioning system is provided to prevent corrosion from being generated by forming a hollow cap between a valve body and a connection pipe and preventing direct contact. CONSTITUTION: A service valve(200) for an air conditioning system comprises a valve body, a valve, a connection pipe, a hollow cone, and a push nut. The valve body(210) includes a first branch part, a declined part, a second branch part, a refrigerant injection part, and a third branch part. A coolant pipe fixed in the first branch part(211) by a nut cap screwed to the outer side. In the declined part, a male screw part is formed at the outside and an insertion part is formed at the inside, and the declined part is formed at the end of the insertion part. A connection pipe is inserted into the insertion part in the second branch part(213). A check valve is inserted into and a core cap screwed up to the refrigerant injection part(215). A valve is inserted into and a cap nut is screwed up to the third branch part(219). The valve(250) is inserted into the third branch part and opens and closes the first branch part and the second branch part. The connection pipe(290) is inserted into the insertion part. The outer circumference of the hollow cone(260) is inserted into the inside of the declined part. The outer declined part is inserted into the inside of the inner declined part of the hollow cone. The female screw part comprises a push nut(270) screwed up to the male screw part.

Description

Service Valve for Air Conditioner {Service Valve for Air Conditioning System}

1 illustrates a configuration of a cooling device and a flow of a refrigerant.

FIG. 2 is a perspective view showing a conventional service valve installed in the cooling device of FIG. 1.

3 is a cross-sectional view of the service valve shown in FIG. 2.

4 illustrates a stopper ring installed in the service valve of FIG. 2.

5 is a schematic side view illustrating a service valve for an air conditioner according to a preferred embodiment of the present invention.

FIG. 6 is a partial cross-sectional view of the service valve shown in FIG. 5.

FIG. 7 is an exploded partial sectional view of the service valve shown in FIG. 5. FIG.

8 is an enlarged cross-sectional view of the hollow cone of the service valve illustrated in FIG. 5.

9 is an enlarged cross-sectional view of a push nut of the service valve illustrated in FIG. 5.

FIG. 10 is an enlarged cross-sectional view of part A of FIG. 6.

11 is a partial cross-sectional view showing a service valve for an air conditioner according to another embodiment of the present invention.

12 is an exploded partial sectional view of the service valve shown in FIG. 11.

FIG. 13 is an enlarged cross-sectional view of part A of FIG. 11.

* Description of the symbols for the main parts of the drawings *

200: service valve 210: valve body

211: first branch 213: second branch

215: refrigerant injection unit 219: third branch

221: core cap 223: check valve

231: cap nut 239: sealing

241: nut cap 250: valve

260: hollow cone 270: push nut

280: hollow cap 290: connector

The present invention relates to a service valve used for an air conditioner for circulating a refrigerant to control the temperature of the air, and even when a high temperature or low temperature refrigerant circulates, it is possible to prevent the refrigerant from leaking between the valve body and the connection pipe, A service valve for an air conditioner capable of preventing galvanic corrosion between the valve body and the connection pipe.

An air conditioner (air conditioner) is to keep the room at an optimal temperature and humidity regardless of external weather conditions, and a humidifier to maintain proper humidity, including cooling and heating devices that cool or warm the indoor air. It also controls humidity, as well as heating and cooling. A cooling device in an air conditioner is a device for cooling a room by absorbing heat from surrounding air when the refrigerant in a low temperature liquid state evaporates and cooling the surrounding air, and generally performs a dehumidifying function together with cooling.

1 is a diagram schematically illustrating a cooling cycle of a cooling device, FIG. 2 is a perspective view illustrating a service valve installed in the cooling device shown in FIG. 1, and FIG. 3 is a cross-sectional view of the service valve shown in FIG. 2. 4 illustrates a stopper ring provided in the service valve of FIG. 2.

As shown in FIG. 1, the cooling apparatus includes a compressor 1100 for compressing a refrigerant circulating through a refrigerant pipe into a gas of high temperature and high pressure, and a high temperature compressed by the compressor 1100 by heat exchange by a first fan 1250. A condenser 1200 for liquefying gas of high pressure into a liquid of high temperature and high pressure, an expansion valve 1300 for expanding the refrigerant 1200 liquefied in the condenser 1200 into a liquid of low temperature and low pressure, and a second fan 1450. It comprises an evaporator (1400, Evaporator) for heat exchange between the refrigerant circulated through the expansion valve 1300 and the air by; The compressor 1100, the condenser 1200, the expansion valve 1300, and the evaporator 1400 are connected to the hollow refrigerant pipe 1500, and the refrigerant circulates along the refrigerant pipe 1500.

In brief description of the state of the refrigerant, the compressor 1100 generally sucks a refrigerant in a gaseous state of about 1.5 atm and about 0 ° C., compresses it into a high pressure gas at 15 atm, 80 ° C., and then condenses 1200. In the condenser 1200, air is passed through the condenser pins through the first fan 1250, and the temperature of the coolant drops to about 60 ° C. and becomes a liquid state. The refrigerant that has passed through the condenser 1200 is expanded at the expansion valve 1300 to become a low-temperature low-pressure liquid state at about 1.5 atm and −5 ° C., and is supplied to the evaporator 1400. In the evaporator 1400, the refrigerant is evaporated by the air vented by the second fan 1450, and the gas is in a state of about 1.5 atm and about 5 ° C. The refrigerant is heat exchanged and circulated while repeating the above state.

In general, the refrigerant pipe 1500 is made of brass. In the refrigerant pipe 1500, the service valve 100 illustrated in FIGS. 2 and 3 is installed to be used to supply and supplement the refrigerant. The service valve 100 is installed at the inlet side of the compressor 1100 or the outlet side of the condenser 1200. As shown in FIG. 2 and FIG. 3, the service valve 100 installed in the cooling device includes a valve body 110. The valve body 110 is branched in four directions, and has a bracket 117 for fixing the valve body 110 to the compressor 1100 or the condenser 1200. The bracket 117 is provided with a fixing hole 117a for fixing the service valve 100.

The valve body 110 is a hollow first branch 111, which is connected to one side of the refrigerant pipe 1500, the hollow second branch 113, which is inserted into the connection pipe 190 and the refrigerant is injected A hollow refrigerant injection portion 115 and a hollow third branch portion 119 are provided. A male screw portion 111a is formed on the outside of the first branch 111, and a nut cap 141 through which a female screw portion is formed is screwed inward, and the first branch 111 and the nut cap ( The refrigerant pipe 1500 is fixedly installed between the 141. The fixing part of the end of the refrigerant pipe 1500 fixedly installed between the first branch 111 and the nut cap 141 is expanded. The connection pipe 190 is inserted and fixed into the second branch 113. The other end of the connection pipe 190 inserted into the second branch 113 is welded to a pump (not shown) to allow the refrigerant to circulate. In general, the connector 190 is made of copper.

In the refrigerant injection unit 115, a check valve 123 for flowing fluid in only one direction is fixedly installed, and an external thread unit 115a is formed outside the refrigerant injection unit 115, and the core cap 121 is formed. The check valve 123 installed on the coolant injection part 115 by being screwed to the male screw part 115a is not exposed to the outside, and also serves to seal the coolant injection part 115.

As shown in FIG. 3, the third branch portion 119 is formed in a hollow shape, and an internal thread portion 119a is formed inward, so that the valve 150 is screwed to the female thread portion 119a. A cylindrical sliding portion is formed at an upper portion of the female screw portion 119a. The outer diameter of the valve 150 is a male screw portion for screwing to the female screw portion 119a, and the upper portion of the male screw portion is provided with a head portion 151 positioned on the sliding portion. A sealing 171 is inserted into the head 151 to contact the sliding part. A groove is formed in the sliding part, and a stopper ring 161 is inserted into the groove to prevent the valve from being separated. The stopper ring 161 serves to prevent the spindle valve 150 from being separated from the third branch portion 119. In the state in which the stopper ring 161 is installed, the outer diameter of the stopper ring 161 corresponds to the inner diameter of the groove, while the inner diameter is larger than the inner diameter of the sliding part to prevent the spindle valve 150 from being separated, and one side is open. And open ends 163 on both open and open sides.

The spindle valve 150 is positioned between the first branch 111, the second branch 113, and the coolant injection unit 115 in the third branch 119. It acts to control communication. In FIG. 2 and FIG. 3, reference numeral 131a illustrates a female thread formed inside the cap nut 131.

When the refrigerant is circulated through the service valve 100 in a state in which the service valve 100 according to the related art is installed at the inlet side of the compressor 1100 or the outlet side of the condenser 1200, The service valve 100 also contracts or expands. The possibility of leakage of the refrigerant at the connection portion between the second branch portion 113 and the connection pipe 190 increases due to contraction or expansion, and the inner diameter of the second branch portion 113 is prevented to prevent leakage of the refrigerant at the connection portion. And the outer diameter of the connection pipe 190 had to be precisely managed and combined. In particular, when the service valve 100 is installed at the inlet side of the compressor 1100 where the refrigerant having a low temperature gas state circulates, the connecting pipe 190 inside the first contraction, and the refrigerant is a gas state that is easy to leak. If the dimensions are not strictly controlled, the cause of leakage can be provided. On the other hand, when the high-temperature (or medium temperature) of the liquid refrigerant is installed on the outlet side of the condenser 1200 circulating because it is expanded, the above problem may not occur, but the second branch together with the connection pipe 190 Since 113 is also expanded, there was a problem in that the strict management in manufacturing.

The present invention is proposed to solve the problems of the prior art as described above, it is possible to prevent the leakage that can occur between the valve body and the refrigerant pipe while the refrigerant is circulating, the high temperature refrigerant circulating or low temperature refrigerant circulating In this case, the object of the present invention is to provide a service valve for an air conditioner in which the possibility of leakage is further reduced so that refrigerant does not leak and galvanic corrosion is prevented.

A service valve connected to an air conditioner for achieving the above object and used to inject and replenish refrigerant has a hollow first branch portion in which a refrigerant pipe is fixed by a nut cap screwed outwardly, and an externally threaded portion is formed on the outside. A hollow portion in which the insertion portion is formed and has an inclined portion formed at the end of the insertion portion, and the hollow second branch portion into which the hollow connecting tube is inserted into the insertion portion, and the check valve is inserted into the core cap is screw-fastened; And a valve body including a hollow third branch portion in which the valve is inserted and the cap nut is screwed; A valve inserted into the third branch to open and close a first branch and a second branch; A hollow connecting tube inserted into the insertion part; A hollow cone having an inner diameter portion of the cylinder into which the connecting tube is inserted, a tapered outer diameter portion, and an inner tapered portion tapered inwardly at the end of the inner diameter portion, wherein the outer diameter portion is inserted into the inclined portion; A cylindrical body having an internally threaded portion formed therein, a support portion extending inwardly in the radial direction from the body, and an extension portion having an outer inclined portion extending parallel to the body from the support portion and tapered outwardly of the end; The part is inserted into the inner inclined portion of the hollow cone and the female screw portion comprises a push nut fastened to the male screw portion; The thermal expansion coefficient of the valve body is characterized in that larger than the thermal expansion coefficient of the connecting pipe.

In the above, the thermal expansion coefficient of the push nut is smaller than the thermal expansion coefficient of the connecting pipe, the elastic coefficient of the push nut is characterized in that it is larger than the elastic coefficient of the valve body and the connecting pipe.

And a cylindrical body portion inserted into the third branch portion and positioned between the connecting tube and the insert portion, and extending inward in a radial direction from an end portion of the body portion, and an annular portion positioned between the end portion of the connecting tube and the third branch portion. , Characterized in that it further comprises a hollow cap made of synthetic resin.

Hereinafter, a service valve for an air conditioner according to a preferred embodiment of the present invention with reference to the drawings will be described in detail. In the detailed description, the same description as in the prior art is omitted, and the same name is used for the configuration having the same function.

5 is a schematic side view showing a service valve for an air conditioner according to a preferred embodiment of the present invention, Figure 6 is a partial cross-sectional view of the service valve shown in Figure 5, Figure 7 is an exploded view of the service valve shown in Figure 5 8 is an enlarged cross-sectional view of the hollow cone of the service valve shown in FIG. 5, FIG. 9 is an enlarged cross-sectional view of the push nut of the service valve shown in FIG. 5, and FIG. It is sectional drawing which expanded part A and shows.

As shown in FIGS. 5 to 10, the service valve 200 according to the preferred embodiment of the present invention includes a valve body 210, a core cap 221 screwed to the valve body 210, and a cap nut ( 231 and a nut cap 241. The valve body 210 is hollow and communicates with each other and extends from the valve body 210 to the first branch portion 211, the second branch portion 213, the refrigerant injection portion 215, and the third portion. A branch 219 is provided. A male screw portion 211a is formed at a part of the outer diameter of the first branch portion 211, and the nut cap 241 is a penetrated tube shape with a female screw portion formed inwardly so that the male screw portion of the first branch portion 211 is formed. The refrigerant pipe 1500 is fixed while being screwed to the 211a. An inclined seating bed portion 211b is formed at the end of the first branch portion 211 to which the refrigerant pipe 1500 whose end is extended is seated. As shown in FIG. 6, the refrigerant pipe 1500 is fixedly installed between the seating bed portion 211b of the first branch portion 211 and the nut cap 241.

As shown in FIGS. 6 and 7, the refrigerant injection unit 215 is formed in a hollow shape, and a check valve 223 for passing the fluid only in one direction is fixedly installed inside the refrigerant injection unit 215. A male thread portion 215a is formed on the outside, and a core cap 221 having a female thread on the inside is screwed to the male thread portion 215a to prevent the check valve 223 from being exposed to the outside, and also serves to seal. .

6 and 7, a female screw portion 219a is formed inside the third branch portion 219, and a male screw portion 219b is formed outside. Inside the third branch 219, a valve 250 having a male screw 253 formed on an outer diameter surface thereof is screwed therein, and the valve 250 includes a first branch 211 and a second branch 213. It controls the flow rate of the refrigerant through). In FIG. 7, reference numeral 251 denotes an inclined end portion, and 237 illustrates a stopper ring installed inside the third branch portion 219 to prevent the valve 250 from being separated. The valve 250 is provided with a sealing 239, and the sealing 239 prevents the refrigerant from leaking while being in contact with the inside of the third branch portion 219. A cam nut 231 having a female screw portion 232 formed therein is fastened to the third branch portion 219.

In the case of adding or replenishing refrigerant to the air conditioner, the cap nut 231 is removed, and the valve 250 is rotated so that the first branch portion 211, the second branch portion 213, and the refrigerant injection portion 215 are provided. After sufficiently communicating with each other, the core cap 211 is separated and the refrigerant is injected through the refrigerant injection unit 215.

As shown in FIGS. 6 and 7, a connection pipe 290 welded to a pump (not shown) provided in an air conditioner is inserted into and fixed to the inside of the second branch portion 213. The connector 290 is made of copper or brass as in the prior art. The valve body 210 is made of a material having a coefficient of thermal expansion larger than that of the material forming the connecting pipe 290. In addition, the core cap 221, the cap nut 231, and the nut cap 241 which are screwed to the valve body 210 may also be manufactured of the same material as the valve body 210. A male screw portion 213a is formed on the outside of the second branch portion 213 and an insertion portion 213b into which the connection pipe 290 is inserted is formed, and a tapered portion is formed at a portion of the end of the insertion portion 213b. The inclined portion 214 is formed. The inclined portion 214 is formed to be inclined in appearance, and the inner diameter increases as the inclined portion 214 approaches the end of the second branch portion 213. The connection pipe 290 is inserted into the insertion portion 213b, and the hollow cone 260 is inserted into the outer diameter of the connection pipe 290.

As shown in FIG. 8, the hollow cone 260 includes an inner diameter part 261 into which the connecting tube 290 is inserted, an inner inclined part 265 extending obliquely from the inner diameter part 261, and an inclined outer diameter part. 263 is provided. The inner slope portion 265 is formed to be inclined in the same direction as the outer diameter portion 263 as shown in FIG.

The outer diameter portion 263 increases in diameter away from the end of the second branch portion 213. The outer diameter portion 263 of the hollow cone 260 is positioned inside the inclined portion 214 to be in contact with the inclined portion 214.

The push nut 270 is screwed to the male screw portion 213a to press the hollow cone 260 to the inclined portion 214. As shown in FIG. 9, the push nut 270 has a cylindrical body 271 having an internally threaded female portion 272 screwed to the male screw portion 213a. And a support portion 273 extending inwardly in the radial direction of the body 271, that is, having a thickness greater than the radial thickness of the body 271, which is parallel to the body 271 from the support portion 273. A cylindrical extension 275 that extends smoothly. An inclined outer inclined portion 277 is formed outside the end of the extension portion 275. Accordingly, a portion of the end portion of the extension portion 275 decreases in the radial thickness toward the end portion.

As shown in FIG. 10, the push nut 270 is screwed to the male screw part 213a, and the outer inclined part 277 of the push nut 270 is connected to the inner inclined part 265 of the hollow cone 260. In contact, the hollow cone 260 is pressed in the direction of the second branch portion 213.

The push nut 270 is preferably made of a material having a coefficient of thermal expansion smaller than that of the material forming the connecting pipe 290.

Hereinafter, the operation of the case of manufacturing the service valve 200 with the same material as described above will be described.

When the service valve 200 having the valve body 210 of the material having a coefficient of thermal expansion larger than the coefficient of thermal expansion of the material constituting the connecting pipe 290 is installed at the inlet side of the compressor 1100 in FIG. The valve 200 circulates a refrigerant in a low temperature low pressure gas state. Since the coolant circulates at a low temperature, the connecting pipe 290 and the valve body 210 are compressed, and the coefficient of thermal expansion of the material forming the valve body 210 is greater than that of the material forming the connecting pipe 290. The contraction amount of 210 is greater than that of the connection tube 290, so that the connection tube 290 inserted into the second branch portion 213 is pressed by the second branch portion 213. Therefore, there is no fear that the refrigerant leaks between the second branch portion 213 and the connection pipe 290, and there is no need to strictly manage the tolerance between the second branch portion 213 and the connection pipe 290 during the manufacturing process. In addition, even when there is an error in the amount of the adhesive applied between the second branch portion 213 and the connection pipe 290, it is possible to prevent leakage due to poor adhesion.

Meanwhile, when the service valve 200 is installed at the outlet side of the condenser 1200 in FIG. 1, the refrigerant in the high temperature (or medium temperature) liquid state is circulated in the service valve 200, and the second branch part 213 is provided. ) And the connection tube 290 is thermally expanded, the thermal expansion coefficient of the material forming the second branch portion 213 is greater than the thermal expansion coefficient of the material forming the connection tube 290, the second branch portion 213 and Gaps may occur between the connectors 290. However, since the coefficient of thermal expansion of the material constituting the push nut 270 screwed to the second branch 213 is smaller than the coefficient of thermal expansion of the material constituting the connecting pipe 290, the amount of thermal expansion of the second branch 213. The inner side acts to press the connection pipe 290, the second branch portion 213 is thermally expanded from the outside.

In order to allow the second branch portion 213 to sufficiently press the connecting pipe 290, the elastic modulus of the material forming the push nut 270 is formed of the valve body 210 or the connecting pipe 290. It is preferable that the elastic modulus is larger than that. Since the push nut 270 has sufficient rigidity, the external force generated by the thermal expansion of the second branch portion 213 may be a pressure for pressing the connecting pipe 290, which acts as the connecting pipe 290.

Since the second branch portion 213 and the connection pipe 290 are made of different materials having different thermal expansion coefficients, corrosion due to a potential difference between the second branch portion 213 and the connection pipe 290 (galvanic ( Galvanic corrosion) is likely to occur, it is preferable to form an oxide layer on the surface of the valve body (210). The thickness of the oxide film layer is preferably formed in the range of 20㎛-40㎛. If the thickness of the oxide film layer is formed to 20㎛ or less, corrosion occurs due to the potential difference in the valve body 210 or the connection pipe 290, and if the thickness of the oxide film layer is more than 40㎛, no potential difference corrosion occurs In addition, the hardness of the oxide layer is increased and the time required to form the oxide layer is increased more than necessary, the effect of the potential difference corrosion is no longer improved.

11 is a partial cross-sectional view showing a service valve for an air conditioner according to another preferred embodiment of the present invention, Figure 12 is an exploded partial cross-sectional view of the service valve shown in Figure 11, Figure 13 is an enlarged view of part A of FIG. It is a cross section.

Between the second branch portion 213 and the connection pipe 290 is further provided with a hollow cap 280 as shown in Figures 11 to 13. The hollow cap 280 is formed of a donut-shaped annular portion 281 and a cylindrical cylindrical portion 283 extending in the extending direction of the second branch portion 213 from the annular portion 281. The annular portion 281 is positioned between the end of the connecting tube 290 inserted into the second branch portion 213 and the second branch portion 213 to connect the second branch portion 213 and the connecting tube 290. To prevent direct contact of the tip The cylindrical portion 283 is positioned outside the connecting pipe 290 to prevent the second branch portion 213 and the connecting pipe 290 from directly contacting in the radial direction. The hollow cap 280 is preferably made of an insulating material such as synthetic resin. By manufacturing the hollow cap 280 as an insulating material, the hollow cap 280 is located between the second branch portion 213 and the refrigerant pipe 1500 to prevent direct contact with the valve body 210 made of different materials. ) And the corrosion due to the potential difference generated between the refrigerant pipe 1500 can be prevented.

While the invention has been shown and described in connection with specific embodiments thereof, it is conventional in the art that various changes, modifications and variations are possible without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone who knows the knowledge of is easy to know.

The air conditioner service valve 200 according to the present invention as described above, the valve body 210 is made of a material having a coefficient of thermal expansion larger than the coefficient of thermal expansion of the connection pipe 290, the thermal expansion coefficient of the connection pipe 290 Since the push nut 270 is manufactured of a material having a smaller coefficient of thermal expansion, when the coolant flows at a low temperature, the valve main body 210 compresses and presses the connecting tube 290 so that the valve main body 210 and the connecting tube 290 are compressed. There is no fear that the gaseous refrigerant leaks, and when the high temperature refrigerant flows, the valve body 210 expands and there is a fear that a gap occurs between the valve body 210 and the connection pipe 290, but the valve body 210 Since the push nut 270 is made of a material having a coefficient of thermal expansion smaller than the coefficient of thermal expansion of the connection pipe 290 to the outside of the valve body 210, the thermal expansion of the valve body 210 occurs inward to pressurize the connection pipe 290. 210 and connector There is no fear that the refrigerant leaks between the 290, even when the dimensions of the valve body 210 or the connection pipe 290 is not precisely installed and the refrigerant is circulated valve body 210 as described above Since the connection pipe 290 is pressurized, it is possible to minimize the time and effort required for connecting the valve body 210 and the connection pipe 290, and a hollow cap between the valve body 210 and the connection pipe 290. By providing 280, there is an effect of preventing direct contact and preventing corrosion from occurring.

Claims (4)

A service valve connected to an air conditioner and used to inject and replenish refrigerant, comprising: a hollow first branch portion 211 to which the refrigerant pipe 1500 is fixed by a nut cap 241 screwed outwardly; A male screw portion 213a is formed, and an insertion portion 213b is formed inwardly, and an inclined portion 214 is formed at the end of the insertion portion 213b, and a hollow connection pipe 290 is inserted portion 213b. The hollow second branch portion 213 and the check valve 223 are inserted into the hollow refrigerant injection portion 215 is inserted into the core cap 221 and the valve 250, the valve 250 is inserted into the cap nut A valve body 210 including a hollow third branch portion 219 to which the 231 is screwed; A valve 250 inserted into the third branch 219 to open and close the first branch 211 and the second branch 213; A hollow connecting tube 290 inserted into the insertion portion 213b; An inner diameter portion 261 of the cylinder into which the connecting pipe 290 is inserted, a tapered outer diameter portion 263, and an inner inclined portion 265 tapered inward at an end of the inner diameter portion 261, A hollow cone 260 into which the outer diameter part 26 is inserted into the inclined part 214; A cylindrical body 271 having a female thread portion 272 inward, a support portion 273 extending inwardly in the radial direction from the body 271, and extending in parallel with the body 271 from the support portion 273. And an extension portion 275 formed with an outer slope portion 277 tapered outwardly of the end, and the outer slope portion 277 is inserted into the inner slope portion 265 of the hollow cone 260 and the female screw. The part 272 is configured to include a push nut 270 is fastened to the male screw portion (213a); The thermal expansion coefficient of the valve body 210 is greater than the thermal expansion coefficient of the connection pipe 290, the service valve for the air conditioner (200). The air conditioner service valve (200) of claim 1, wherein the thermal expansion coefficient of the push nut (270) is smaller than that of the connection pipe (290). 3. The air conditioner service valve according to claim 2, wherein the elastic modulus of the push nut (270) is greater than the elastic modulus of the valve body (210) and the connection pipe (290). The cylindrical body portion 283 of claim 1, which is inserted into the third branch portion 213 and is located between the connecting pipe 290 and the insertion portion 213b, and has a radius from an end of the body portion 283. The air conditioner further comprises an hollow cap 280 extending inwardly and formed in an annular portion 281 located between the end of the connecting pipe 290 and the third branch portion 213. Service valve (200).

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