JP2003148835A - Four-way selector valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of a selector valve by improving the easiness in switching refrigerant channels and the alterness, and simplifying the constitution and operation. SOLUTION: This four-way selector valve comprises a motor part 10 composed of a stator 20 and a rotor 40, a case 30, a main valve 70 mounted in a valve chamber 73 in the case, and a valve body 50. The valve body 50 comprises an intake pressure conduction hole 54, a discharge pressure conduction hole 55, and two conduction holes 56, 57. The main valve 70 comprises a communicating part 74 for selectively communicating the intake pressure conduction hole and two conduction holes, and a pressure equalizing hole 77 communicating the communication part and the valve chamber. A sub-valve 60 interlocking with the rotation of the rotor is mounted on the main valve. The sub-valve is provided with two pressure equalizing hole closing parts 63 for moving and stopping the pressure. The pressure equalizing hole is closed by one of two pressure equalizing hole closing parts by the rotation of the sub-valve. The main valve is moved to switch the conduction hole in a closed condition of the pressure equalizing hole. The sub-valve is provided with a curved hole 64 for freely fitting a main valve interlocking rod 72 mounted on a main valve side, and the main valve is rotated when the sub-valve is rotated by more than a predetermined amount by the rotation of the rotor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-way switching valve, and more particularly to a four-way switching valve having a main valve provided with a discharge pressure relief valve as a sub valve.

[0002]

2. Description of the Related Art Generally, an air conditioner used for a room air conditioner or the like can change a flowing direction of a refrigerant to perform a cooling operation or a heating operation depending on the season. It's done by a valve. Figure 7
FIG. 4 shows an example of a cooling / heating cycle of an air conditioner using the switching valve. The heating / cooling cycle includes a compressor C
, The switching valve SV, the heat exchangers E1 and E2, and the electronic linear control valve T are connected, and the refrigerant during the cooling operation is the compressor C, the switching valve SV, and the outdoor heat exchange as indicated by the solid arrow. Bowl E
1, the electronic linear control valve T, and the indoor heat exchanger E2 flow in this order, pass through the switching valve SV, and then return to the compressor C for circulation. The refrigerant during the heating operation flows in the order of the compressor C, the switching valve SV, the indoor heat exchanger E2, the electronic linear control valve T, and the outdoor heat exchanger E1 as indicated by the one-dot chain line arrow, and the switching valve SV.
After passing through V, it returns to the compressor C again and circulates.

As an example of the switching valve, various four-way switching valve technologies have been proposed. For example, utility model registration No. 25
In the technology of the four-way switching valve described in JP-A-23031, switching of the refrigerant flow path between the discharge pressure communication hole and the communication hole, the suction pressure communication hole and the communication hole in the valve body is performed inside and outside the main valve. ing.

However, in this technique, a low-pressure suction pressure is generated inside the main valve and a high-pressure discharge pressure is generated outside the main valve. Therefore, a pressure difference occurs across the main valve, so that the switching operation is performed. In this respect, the four-way switching valve does not take into consideration the ease and agility of the switching operation of the refrigerant passage. In addition,
According to the technique of the four-way switching valve described in Japanese Patent No. 32389, switching operation of the refrigerant passage by the main valve is performed after eliminating the pressure difference in the valve body, but the main valve is rotated by expansion and contraction of the elastic member. Therefore, no particular consideration is given to the agility of the switching operation of the refrigerant flow path and the reliability of the four-way switching valve.

[0005]

Therefore, the applicant of the present invention is
In order to solve the above problems, Japanese Patent Application No. 2000-330 is first mentioned.
Japanese Patent Application No. 377 and Japanese Patent Application No. 2001-147265 provide a four-way switching valve whose object is to improve the ease and agility of the switching operation of the refrigerant passages. The present invention is a further improvement of the present invention, and its object is to further improve the ease of switching the refrigerant passages, the agility, and the simplification of the configuration and operation, and the reliability of the switching valve. It is to provide a four-way switching valve that can further improve the

[0006]

In order to achieve the above object, the motor-operated valve according to the present invention comprises the following means.
A four-way switching valve according to claim 1 includes a motor section (10) including a stator (20) and a rotor (40), and a case (3).
0), the main valve (70) arranged in the valve chamber (73) in the case (30), and the valve body (50), in the four-way switching valve (100), the valve body (50) includes A suction pressure communication hole (54) and a discharge pressure communication hole (55), which communicate with the suction pressure side and the discharge pressure side of the compressor (C),
The main valve (70) includes two suction holes (56, 57) communicating with the indoor and outdoor heat exchangers, respectively, and the main valve (70) has the suction pressure communication hole (54) and the two communication holes (56, 5).
7) and a pressure equalizing hole (7) for communicating the communication portion (74) and the valve chamber (73) with each other.
7) and a sub-valve (60) interlocked with the rotation of the rotor (40) is provided on the main valve (70), and the sub-valve (60) is provided with two valves for moving and stopping the pressure. A pressure equalizing hole closing portion (63a, 63b) is provided, and the auxiliary valve (60) is provided.
Rotation of the pressure equalizing hole (77) closes the pressure equalizing hole (77) with one of the two pressure equalizing hole closing portions (63a, 63b), and when the pressure equalizing hole (77) is closed, It is characterized in that the valve (70) is moved to switch the communication holes (56, 57).

According to a four-way switching valve of a second aspect, in addition to the means of the first aspect, the auxiliary valve (60) is provided with a main valve interlocking rod (72) provided on the main valve (70) side. Bent hole (6
4) is formed, and the main valve (70) is rotated when the auxiliary valve (60) rotates more than a predetermined amount by the rotation of the rotor (40).

A four-way switching valve according to a third aspect is the means according to the first or second aspect, in which any one of the equalizing hole closing portions (6
3a, 63b) closes the pressure equalizing hole (77), even if the auxiliary valve (60) further rotates a predetermined angle when the motor unit (10) stops, the valve body contact of the main valve (70) is reduced. It is characterized in that the contact portion (78) is formed with a margin width which does not cover any of the openings of the two conduction holes (56, 57). In addition, although the above-mentioned constituent members are attached with the reference numerals in the drawings in order to facilitate understanding of the correspondence with the embodiment, the invention described in the claims is not limited to the embodiment. . Further, among the constituent requirements of the four-way switching valve according to claim 3, the "margin width" means that the auxiliary valve (60) is different from the main valve (70) due to motor characteristics and mechanical vibration.
Even if it deviates from the predetermined stop position, the valve body contact part (7
8) does not cover the opening of the through hole (54, 57), and therefore means that there is no fear that the valve chamber (73) and the through hole (54, 57) communicate (bypass). .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a four-way switching valve 100 of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a four-way switching valve in an embodiment of the present invention, FIG. 2 is a rear view of the four-way switching valve of FIG. 1, and FIGS. 3 (A) to (D) show the operation of the four-way switching valve. FIG. 1 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 4 is an explanatory diagram showing an operation corresponding to (A) to (D) in FIG. In the following description, the meaning of “upper, lower, left, right” means “upper, lower, left, right” in the drawings, and does not necessarily mean “upper, lower, left, right” in actual use.

The four-way switching valve 100 of the illustrated embodiment comprises a motor section 10 having a stepping motor and a valve body 50 having a main valve 70.
When 0, the main valve 70 is rotated on the valve main body 50 as the stepping motor is energized, and the refrigerant flow path is switched. The motor unit 10 is composed of a stator 20 and a rotor 40. The stator 20 includes a stator coil 21 and a yoke 22 that are housed vertically, and the stator coil 21 has a cable 23 in which lead wires are bundled and a stator. A connector 24 provided on the outer periphery of 20 is connected.

A case receiving portion 52 is screwed into the valve main body 50, a main body case 51 is provided at an upper edge portion of the case receiving portion 52, and a case 30 which is a can is hermetically sealed in the main body case 51. It is connected and fixed in a shape. In addition, the valve body 50
A main valve 70 and a sub valve 60 arranged on the main valve 70 are arranged in the upper valve chamber 73, and a conduit group (not shown) is provided in the lower portion of the valve body 50. Further, the motor unit 10 is fitted onto the case 30, and the rotor 40 and the like are fitted inside. The case 30, the main body case 51, and the case receiving portion 52 are made of, for example, stainless steel.

The rotor 40 is inserted into a support shaft 42 and has a magnet on its outer circumference. Further, a drive portion 47 of the sub valve 60 is integrally arranged below the rotor 40 via a connecting ring frame 41 and along the support shaft 42. Drive unit 4
Driving teeth are formed on the outer circumference of the member 7 over a certain height.

A lower portion of the support shaft 42 is supported by the valve body 50, and an upper portion thereof is pivotally supported by the support frame 31 supported by the case 30. In addition, a push spring 46, which is compressed between a main valve 70 side and a support shaft 42 side spring receiver 45, which will be described later.
Are elastically supported above.

A main body case 51 is integrally joined to a lower portion of the case 30, the main body case 51 is fitted and connected to a case receiving portion 52, and a lower portion of the valve body 50 is internally fitted and screwed to the lower portion of the case 30. The main body case 51, the case receiving portion 52, and the valve main body 50 are integrally fixed. The upper surface of the valve body 50 constitutes the bottom of the valve chamber 73, and the suction pressure conduction hole 54 for introducing the suction pressure of the compressor, the discharge pressure conduction hole 55 for introducing the discharge pressure, the indoor and outdoor heat exchangers are provided. The outdoor heat exchanger communication hole 56 and the indoor heat exchanger communication hole 5 which are communicated with each other.
7 is provided.

The conduction hole will be described in more detail with reference to FIGS. 3 and 5. The suction pressure conduction hole 54 and the discharge pressure conduction hole 55 are provided at symmetrical positions with respect to the support shaft 42. At the same time, the outdoor heat exchanger communication hole 56 and the indoor heat exchanger communication hole 57 are different in predetermined angular position from the suction pressure communication hole 54 and the discharge pressure communication hole 55 at symmetrical positions with respect to the support shaft 42. Each is provided.

The conduit group (not shown) includes a suction pressure communicating hole 54.
The suction pressure conducting pipe connected to the discharge pressure conducting pipe, the discharge pressure conducting pipe connected to the discharge pressure conducting hole 55, and the outdoor heat exchanger conducting hole 5
An outdoor heat exchanger connection pipe connected to No. 6 and an indoor heat exchanger connection pipe connected to the indoor heat exchanger communication hole 57 are connected to the lower end side of the valve body 50.

The main valve 70 is housed in the valve chamber 73 in the case 30 and is rotatably and slidably mounted on the upper surface of the valve body 50. As shown in FIGS. 3 (A) to 3 (C), the main valve 70 has a butterfly blade shape that is bilaterally symmetrical in plan view, has a constant height, and has a support shaft hole in a central recessed portion at the center thereof. A single concentric communicating portion 74 is formed on the lower surface thereof. Further, the peripheral portion of the communication portion 74 forms a contact portion with the upper surface of the valve body 50, that is, a valve body contact portion 78.

The communication section 74 is shown in FIGS.
In the state of (A), the suction pressure conduction hole 54 and the conduction hole 57 for the indoor heat exchanger are communicated with each other. Further, in this state, the discharge pressure communication hole 55 and the communication hole 56 for the outdoor heat exchanger communicate with each other through the valve chamber 73. In addition, in the state of FIG. 3D and FIG.
The suction pressure communication hole 54 and the communication hole 56 for the outdoor heat exchanger are communicated with each other. Further, in this state, the discharge pressure communication hole 55 and the communication hole 57 for the indoor heat exchanger are connected to the valve chamber 73.
Through the.

Further, the main valve 70 is provided with a pressure equalizing hole 77 for communicating the communicating portion 74 with the valve chamber 73 above. When the pressure equalizing hole 77 is opened, the flow of the refrigerant from the valve chamber 73 to the communicating portion 74 causes the valve chamber 73 and the communicating portion 7 to flow.
The fluid pressure becomes similar to that of fluid No. 4, and when the main valve 70 is rotated, the rotation of the main valve 70 becomes smooth, and as a result, the switching of the refrigerant is smooth, quick, and easy. .
Further, a main valve interlocking rod 72 is erected on the upper surface of the main valve 70, and the main valve interlocking rod 72 is loosely fitted in a curved hole 64 formed in a sub valve 60 described later. . That is, while the main valve interlocking rod 72 is free to move in the curved hole 64, the auxiliary valve 60 does not apply a rotational force to the main valve 70, but the main valve interlocking rod 72 is attached to the end of the curved hole 64. When the auxiliary valve 60 abuts and further rotates, the rotation of the curved hole 64, that is, the rotation of the auxiliary valve 60 causes
The main valve interlocking rod 72, that is, the main valve 70 rotates together.

A sub valve 60 is arranged on the upper surface of the main valve 70. The sub-valve 60 rotates and drives the main valve 70 and opens and closes the pressure equalizing hole 77 formed in the main valve 70, so that the communication portion 74 formed in the main valve 70 and the main body case 51. It has an effect of adjusting (decreasing) the pressing force of the main valve 70 with respect to the valve main body 50 by communicating or closing with the valve chamber 73 inside so as to move or cut off the pressure. The sub-valve 60 is circular in plan view and has a certain thickness, and a passive tooth portion 62 is formed on the outer peripheral portion thereof. Further, a rotary shaft hole 61 is bored in the central portion thereof, and is pivotally supported by a rotary shaft 71 erected on the upper surface of the main valve 70. By appropriately selecting the ratio between the number of teeth of the passive tooth portion 62 and the number of teeth of the driving portion 47, the passive tooth portion 6
It can be set to amplify the torque on the second side. At least the contact surface of the sub valve 60 with the main valve 70 is preferably made of Teflon (registered trademark) -containing resin, Teflon-containing surface-treated metal, or the like in order to reduce rotational resistance. On the contrary, a similar material may be used for the upper surface of the main valve 70.

The sub-valve 60 rotates on the main valve 70 by the rotation of the drive unit 47, and the main valve 7 rotates at a predetermined angle or more.
It has a function of rotating 0 around the support shaft 42 and a function of opening and closing the pressure equalizing hole 77. Therefore, in the peripheral portion of the sub valve 60, a curved hole 64 is formed over a certain range.
And the pressure equalizing hole closing portions 63a and 63b are provided at the left and right ends of the curved hole 64, respectively. In this embodiment, since the pressure equalizing hole closing portions 63a and 63b are fitted and fixed as separate members to the holes formed in the sub valve 60,
The pressure equalizing hole closing portions 63a and 63b can be attached / detached / replaced.

Next, the operation of the four-way switching valve of this embodiment will be described with reference to FIGS. In the motor unit 10,
By energizing and exciting the stator coil 21 through the cable 23 and the connector 24, the auxiliary valve 60 is rotated by the rotation of the rotor 40 and the motor unit 10 is driven by the drive unit 47.
In accordance with the rotation angle per unit pulse, the main valve 70 is rotated to open and close the pressure equalizing hole 77, and further rotation of the rotor 40 causes the main valve 70 to cooperate with the sub valve 60 and the valve body. Fifty
The upper part is rotated to switch the flow of the refrigerant described later.

Next, the specific operation of the four-way switching valve 100 will be described. 3A to 3D and FIGS. 4A to 4D are operation explanatory diagrams for explaining the operation of the four-way switching valve 100.

3 (A) and 4 (A) show the set state during the cooling operation, and the suction pressure conducting pipe (suction pressure conducting hole 54) and the conducting pipe for the indoor heat exchanger (conducting hole 57). ) Communicates with the main valve 70 via the communication portion 74, and the discharge pressure communication hole 55 and the communication hole 56 for the outdoor heat exchanger communicate with the outside of the main valve 70, that is, the valve chamber 73. In this state,
There is a large pressure difference between the pressure in the valve chamber 73 and the pressure in the communicating portion 74, and the main valve 70 is affected by this pressure difference.
It is held at 0 and does not move easily. When switching the refrigerant flow path from this state, the four-way switching valve 100
Uses the relief valve 60, which is a relief valve, to balance the respective pressures in the valve chamber 73 and the communication portion 74, and after removing the force that presses the main valve 70, the main valve 70 is rotated.

First, in the state shown in FIGS. 3A and 4A, pulse input to the stepping motor causes
By rotating the sub valve 60 meshing with the gear via the drive unit 47, the pressure equalizing hole 77 of the main valve 70, which has been closed by one pressure equalizing hole closing unit 63a of the sub valve 60, is released. The refrigerant in the chamber 73 is introduced into the communicating portion 74 via the pressure equalizing hole 77, and the pressure in the valve chamber 73 and the pressure in the communicating portion 74 are balanced.

When the sub-valve 60 is rotated by a certain angle and the pressure equalizing hole 77 is released from the closed state as shown in FIGS. 3 (B) and 4 (B), the valve chamber 73 and the communicating portion are opened. The pressure is balanced with that of the main valve 74, and then the curved hole 64 abuts (collides) with the main valve interlocking rod 72, and the pressure equalizing hole closing portion 63b of the other side closes the pressure equalizing hole 77 of the main valve 70 ( 3C and FIG.
(C)) In this state, the curved hole 64 pushes the main valve interlocking rod 72 to move the main valve 70 at a constant angle in the direction of the timepiece hands, that is,
Rotate and slide until the state shown in FIG. 3D and FIG. 4D is obtained. By this operation, the communication between the suction pressure communication hole 54 and the communication hole 57 by the communication portion 74 of the main valve 70 is switched to the communication between the suction pressure communication hole 54 and the communication hole 56, and at the same time, through the valve chamber 73. Discharge pressure conducting hole 55 and conducting hole 56
Communication with the discharge pressure communication hole 55 and communication with the communication hole 57 are switched.

By this operation, the set state during the heating operation, that is, the suction pressure communication hole 54 and the communication hole 56 for the outdoor heat exchanger communicate with each other through the communication portion 74 of the main valve 70.
The discharge pressure communication hole 55 and the communication hole 57 for the indoor heat exchanger communicate with each other through the valve chamber 73. Also, during this time,
By rotating the main valve 70 in a state where the pressure equalizing hole 77 is closed by the other pressure equalizing hole closing portion 63b, the pressure difference between the valve chamber 73 and the communication portion 74 does not fluctuate. Rotation becomes smooth. When the state of FIGS. 3D and 4D is changed to the states of FIGS. 3A and 4A, the motor unit 10 may be rotated in the opposite direction. .

As described above, the four-way switching valve 100 of the present invention.
After rotating the sub valve 60 on the main valve 70 by an input pulse to the motor unit 10, the main valve 70 rotates on the valve main body 50 with a sufficient torque, and the valve chamber 73 and the communication unit. Since the flow of the refrigerant is switched after the pressure of 74 is balanced, the switching operation of the flow path of the refrigerant can be performed easily and quickly with a simple configuration and operation. The reliability of 100 can be improved.

Since both the sub valve 60 and the main valve 70 can be made to function with a simple structure, the number of moving parts can be reduced and the product cost of the four-way switching valve 100 can be reduced.

FIGS. 5A to 5D show the operation of another example of the four-way switching valve, and FIGS. 6A to 6D correspond to FIGS. 5A to 5D. It is explanatory drawing which shows a corresponding operation. Further, the members denoted by the same reference numerals as those in FIGS. 5 and 6 have the same configuration as those in FIGS. The feature of this another example is that the valve body contact portion 78 that contacts the valve body 50 of the main valve 70 is in the state shown in FIGS. 5 (A) and 6 (A).
The edge of the opening of the suction pressure conducting hole 54 and the conducting hole 57.
It is located with a margin Y from the edge of the.

With the above structure, FIG. 5 (A) and FIG. 6 (A)
At the position where the pressure equalizing hole closing portion 63a closes the pressure equalizing hole 77, when the energization to the motor portion is stopped, the sub valve 60 is further rotated by a predetermined angle due to motor characteristics or the like (see FIG. ), FIG. 6B), the valve body contact portion 78 of the main valve 70 is formed with a margin Y so that it does not touch any of the openings of the two through holes 54, 57. Further, with the above configuration, in the state in which energization to the motor unit 10 is stopped at the position where the pressure equalizing hole closing portion 63b closes the pressure equalizing hole 77 in FIGS. 5C and 6C,
Even if the sub valve 60 is further rotated by a predetermined angle (FIG. 5 (D), FIG.
(D)), the valve body contact portion 78 of the main valve 70 does not touch any of the openings of the two communication holes 54, 56. Therefore, the four-way switching valve 100 of the present invention can be applied to products having various motor characteristics.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and is not limited to an air conditioner, and can be applied to all devices that switch a flow path. It is available.

[0033]

As can be understood from the above description, the four-way directional control valve of the present invention constructed as described above can be switched quickly during use, has a simple construction, has good durability, and has a failure. There are few effects, and the parts can be easily replaced and the versatility is excellent. In addition, the curved hole is loosely fitted to the main valve interlocking rod provided on the main valve side, and the main valve is rotated in the state where the curved hole side wall is in contact with the main valve interlocking rod. It is possible to transmit the turning power. Further, the operation of the motor section is simplified by providing the equalizing hole closing section in the sub valve. Furthermore, since the shape of the communication portion with respect to the opening of the conduction hole has a margin, the versatility can be improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a four-way switching valve according to an embodiment of the present invention.

FIG. 2 is a rear view of the four-way switching valve of FIG.

3A to 3D are cross-sectional views taken along the line AA of FIG. 1 showing the operation of the four-way switching valve.

FIG. 4 is an explanatory view showing an operation corresponding to (A) to (D) of FIG.

5A to 5D are cross-sectional views corresponding to FIG. 3, showing an operation of another example of the four-way switching valve.

FIG. 6 is an explanatory diagram showing an operation corresponding to (A) to (D) of FIG.

FIG. 7 is a cycle configuration diagram during cooling / heating operation.

[Explanation of symbols]

C ... Compressor SV ... Switching valve T ...
Electronic linear control valves E1, E2 ··· Heat exchanger Y · · Width of margin 10 · · Motor part 20 · · Stator 21 · · Stator coil
22..Yoke 23..cable 24..connector 30..case (can) 31..support frame 40..rotor 41..connecting ring frame 4
2 ··· Support shaft 45 ··· Spring receiver 46 · · Push spring (elastic member) 47 · · Drive unit 48 · · Stator holding rod 4
9 ・ ・ Mounting bolt 50 ・ ・ Valve body 51 ・ ・ Main body case 52 ・ ・
Case receiving part 53..Mounting screw part 54..Suction pressure conducting hole 55..Discharge pressure conducting hole 56 .... (For outdoor heat exchanger) Conducting hole 57 ... (For indoor heat exchanger) Conducting hole 58 ..
Main valve stopper 60 ・ ・ Sub valve 61 ・ ・ Rotating shaft hole 62 ・ ・
Passive teeth 63a, 63b ··· Pressure equalizing hole closing part 64 · · Curved hole 70 · · Main valve 71 · · Rotating shaft 72 · · Main valve interlocking rod 73 · · Valve chamber 74 · · Communication part 77 · · Uniform Pressure hole 78 ... Valve body contact part 100 ... Four-way switching valve

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Claims (3)

[Claims] 1. A motor unit comprising a stator and a rotor, a case, a main valve arranged in a valve chamber in the case, and a valve body,
In the four-way switching valve equipped with, the valve body has suction pressure communication holes and discharge pressure communication holes that communicate with the suction pressure side and the discharge pressure side of the compressor, respectively, and communicates with the indoor and outdoor heat exchangers, respectively. The main valve includes a communication part that selectively communicates the suction pressure communication hole and the two communication holes, and a pressure equalizing hole that communicates the communication part with the valve chamber. In addition to the above, the main valve is provided with a sub valve interlocked with the rotation of the rotor, and the sub valve is provided with two pressure equalizing hole closing portions for moving and stopping the pressure. A four-way switching valve characterized in that the pressure equalizing hole is closed by either one of the two pressure equalizing hole closing portions, and the main valve is moved to switch the conduction hole when the pressure equalizing hole is closed. 2. A sub-valve is formed with a curved hole into which a main-valve interlocking rod provided on the main valve side is loosely fitted, and when the sub-valve rotates more than a predetermined amount by the rotation of the rotor, the main valve The four-way switching valve according to claim 1, wherein the four-way switching valve is rotated. 3. A valve main body contact of a main valve, even if the auxiliary valve further rotates a predetermined angle when power supply to the motor is stopped at a position where any one of the pressure equalizing hole closing parts closes the pressure equalizing hole. The contact portion is formed with a margin width that does not cover any of the openings of the two conduction holes.
The four-way switching valve described.