JP2014194231A - Check valve for coolant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve for a coolant which isolates an elastic member to prevent the elastic member from contacting with chips and abrasive grain etc.SOLUTION: A check valve 1 for a coolant includes: a hollow cylindrical housing 2; a cup shaped valve 3 which slides in the housing 2; a fluid communication passage 35 which is disposed in the valve 3 and circulates a fluid from the upstream side to the downstream side; and a fluid communication hole 32 where an outer peripheral wall surface 3A communicates with the fluid communication passage 35. The fluid communication passage 35 is opened and closed by sliding the valve 3. A flange part 31 is formed at an entire periphery of the outer peripheral wall surface 3A in the valve 3. One end part 7B of an elastic member 7 contacts with the flange part 31. The other end part 7A of the elastic member 7 contacts with an elastic member contact part 64 of a cap 6 connected with the housing 2. Further, the elastic member 7 is formed in a space among the outer peripheral wall surface 3A, an inner peripheral wall surface 24 of the housing 2, and the flange part 31.

Description

  A hollow cylindrical housing, a cap connected to the housing, a cup-shaped valve that slides in the housing, and a fluid communication path that is disposed in the valve and that circulates fluid from the upstream side to the downstream side The present invention relates to a coolant check valve that is provided with a fluid communication hole through which an outer peripheral wall surface of the valve and the fluid communication path communicate with each other, and is configured to open and close the fluid communication path by sliding the valve.

As a conventional check valve, for example, there is a check valve 200 shown in FIG.
A check valve 200 shown in FIG. 11 includes a hollow cylindrical housing 201 and a cup-shaped valve 202 that slides inside the housing. Further, in the valve 202, a fluid communication path 203 is formed to flow the fluid from the upstream side to the downstream side, and a fluid communication hole 204 is provided for communication between the outer peripheral wall surface 202A of the valve 202 and the fluid communication path 203. ing. In addition, an elastic member 205 that urges the valve 202 toward the valve seat 206 is formed in the fluid communication path 203.
As shown in FIG. 11, when the check valve 200 is in the open state, the fluid F flows into the fluid communication path 203 through the fluid communication hole 204.

JP 2005-226695 A

However, the conventional check valve has the following problems.
That is, as shown in FIG. 11, when the fluid F flows into the fluid communication path 203, the fluid F and the elastic member 205 come into contact with each other. When the fluid F is a coolant liquid containing foreign matter such as chips and abrasive grains, foreign matter such as chips and abrasive grains may be caught in the elastic member 205. This is a problem because a bulk block may be generated when foreign materials such as chips and abrasive grains get caught in the elastic member 205.
Even if the valve block does not occur, foreign matter such as chips and abrasive grains accumulates at a portion where the flow speed of the fluid communication passage 203 is low, which may cause a problem such as a full open failure.

  The present invention has been made to solve the above-described problems, and has an object to provide a check valve for coolant that isolates an elastic member and prevents the elastic member and chips, abrasive grains, etc. from contacting each other. And

In order to achieve the above object, a coolant check valve according to the present invention has the following configuration.
(1) A hollow cylindrical housing, a cap connected to the housing, a cup-shaped valve that slides in the housing, and a fluid that is disposed in the valve and circulates fluid from the upstream side to the downstream side A coolant check valve comprising a communication passage, a fluid communication hole that communicates with an outer peripheral wall surface of the valve and the fluid communication passage, and configured to open and close the fluid communication passage by sliding of the valve. The flange portion is formed over the entire circumference of the outer peripheral wall surface, one end portion of the elastic member is in contact with the flange portion, and the other end portion of the elastic member is in contact with the housing or the cap. In addition, the elastic member is formed between the outer peripheral wall surface, the inner peripheral wall surface of the housing, and the flange portion.

  Thereby, since the elastic member is isolated from the fluid communication path, it is possible to prevent foreign matters such as chips and abrasive grains from biting into the elastic member. By preventing biting into foreign matter such as chips and abrasive grains, it is possible to prevent the occurrence of a valve block and prevent problems such as full open failure.

(2) In the coolant check valve described in (1), the fluid is a coolant liquid containing foreign matter such as chips and abrasive grains, and a filter for stopping the foreign matter is formed upstream of the housing. It is preferable that the clearance between the outermost peripheral portion of the brim portion and the inner peripheral wall surface is equal to or smaller than the opening of the filter.

  Thereby, foreign matter such as chips and abrasive grains passing through the filter does not flow from between the flange portion and the inner peripheral wall surface. For this reason, it is possible to prevent foreign matter such as chips and abrasive grains from biting into the elastic member. By preventing biting into foreign matter such as chips and abrasive grains, it is possible to prevent the occurrence of a valve block and prevent problems such as full open failure.

(3) In the coolant check valve described in (1) or (2), the valve includes a first guide in which the flange portion is in contact with the inner peripheral wall surface, and a downstream side wall surface of the fluid communication path is in the inner side. It is preferable to have a second guide that contacts the peripheral wall surface, and that there is a distance between the first guide and the second guide.

  Thereby, the parallelism of the valve can be maintained. Therefore, blurring of the valve body and the valve seat can be prevented, and the valve body can be uniformly brought into contact with the valve seat.

(4) In any one of the coolant check valves according to (1) to (3), a valve body portion corresponding to a bottom surface of the cup-shaped valve has a tapered surface in an outer peripheral direction around the central axis of the valve. It is preferable that the tapered surface has an inclination of 10 degrees or more and 20 degrees or less with respect to a vertical line perpendicular to the central axis.

  Thereby, a valve body can be stabilized. That is, by forming the tapered surface on the valve, the valve body can be stabilized because it has a streamlined shape with respect to the flow path and the fluid flows uniformly around the valve.

(5) In any one of the coolant check valves described in (1) to (4), it is preferable that a valve end corresponding to an upper surface of the cup-shaped valve has a tapered shape.

  Thereby, when the valve is opened, foreign matters such as chips and abrasive grains accumulated at the end of the valve can be pushed out. The reason is that the taper shape allows foreign matter such as chips and abrasive grains accumulated at the end of the valve to be scraped out like dust. Foreign matter, such as scraped chips and abrasive grains, flows to the downstream side as it flows through the fluid communication path.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that foreign materials, such as a chip and an abrasive grain, are biting into an elastic member, and generation | occurrence | production of a bullock can be prevented.

It is sectional drawing of the check valve for coolants (at the time of valve closing) concerning the present invention. It is sectional drawing of the check valve for coolants (at the time of valve opening) which concerns on this invention. It is the figure which showed the direction of the fluid which flows through the check valve for coolants (at the time of a full open valve) concerning the present invention. It is the enlarged view which showed the direction of the fluid which flows through the check valve for coolant (at the time of a full open valve) shown by the dotted line M shown in FIG. 3 which concerns on this invention. It is the figure which showed the direction of the fluid which flows through the check valve for coolants (at the time of 70% valve opening) which concerns on this invention. It is the enlarged view which showed the direction of the fluid which flows through the check valve for coolant (at the time of 70% valve opening) shown by the dotted line N shown in FIG. 5 which concerns on this invention. It is the enlarged view which showed the direction of the fluid which flows through the check valve | bulb for coolant concerning the present invention (just before full opening). It is an enlarged view (1) of the downstream side wall surface of the fluid communication path which concerns on this invention. It is an enlarged view (2) of the downstream side wall surface of the fluid communication path which concerns on this invention. It is an enlarged view (3) of the downstream side wall surface of the fluid communication path which concerns on this invention. It is sectional drawing of the check valve for coolant concerning a prior art.

Next, an embodiment of a coolant check valve according to the present invention will be described with reference to the drawings.
FIG. 1 shows a cross-sectional view of the coolant check valve 1 (when closed). FIG. 2 shows a cross-sectional view of the coolant check valve 1 (when opened). FIG. 3 is a diagram showing the direction of fluid flowing through the coolant check valve 1 (when fully opened). FIG. 4 is an enlarged view showing the direction of fluid flowing through the coolant check valve 1 (when fully opened) indicated by a dotted line M shown in FIG. FIG. 5 is a diagram showing the direction of fluid flowing through the coolant check valve 1 (70% open). FIG. 6 is an enlarged view showing the direction of fluid flowing through the coolant check valve 1 (70% opened) indicated by a dotted line N shown in FIG. FIG. 7 is an enlarged view showing the direction of the fluid flowing through the coolant check valve 1 (immediately before full opening). 8 to 10 are enlarged views (1), (2), and (3) of the downstream side wall surface of the fluid communication path 35. FIG.

<Configuration of coolant check valve>
The coolant check valve 1 shown in FIG. 1 is a check valve. The fluid flowing through the coolant check valve 1 is a coolant liquid containing foreign matters such as chips and abrasive grains. As shown in FIG. 1, the coolant check valve 1 includes a housing 2, a valve 3, and a cap 6.

As shown in FIG. 1, the housing 2 is formed in a stepped hollow cylindrical shape. On the inner periphery of the housing 2, a female screw 23, a sliding wall surface portion 24, and an inflow portion 25 are formed from the downstream end portion 22 to the upstream end portion 21.
A throttle portion 27 is formed between the sliding wall surface portion 24 and the inflow portion 25, and separates the sliding wall surface portion 24 and the inflow portion 25. A valve seat portion 26 that contacts and separates from the valve 3 is formed on the sliding wall surface portion 24 side of the throttle portion 27. The valve seat portion 26 is formed between the most restricting portion 27A of the restricting portion 27 and the horizontal portion 24A of the sliding wall surface portion 24, and has a tapered shape in a direction extending from the most restricting portion 27A to the horizontal portion 24A.

  The cap 6 is formed in a hollow cylindrical shape, and a cap channel 61 is formed at the center thereof. The cap channel 61 is formed by a channel wall surface 62. A male screw 63 is formed on the outer periphery of the cap 6 and is screwed with the female screw 23 of the housing 2. The housing 2 and the cap 6 are integrated by screwing. On the outer periphery of the cap 6, an elastic member contact portion 64 that is a step is formed over the entire periphery. The elastic member contact portion 64 is formed in a direction perpendicular to the flow channel wall surface 62. Further, one end 7 </ b> A of the elastic member 7 is in contact with the elastic member contact portion 64.

  As shown in FIG. 1, the valve 3 has a substantially cup shape that slides on the inner periphery of the housing 2. A fluid communication path 35 is formed on the inner periphery of the valve 3. An opening is formed on the downstream side of the fluid communication path 35. In addition, a fluid communication hole 32 is formed through which the fluid communication path 35 communicates with the outer peripheral wall surface 3A. In the present embodiment, the fluid communication holes 32 are formed at a total of four locations at opposing positions on the entire circumference of the valve 3.

A flange 31 is formed over the entire circumference of the valve 3. The flange 31 is formed in a direction perpendicular to the outer peripheral wall surface 3A. As shown in FIG. 1, the downstream end 32 </ b> A of the fluid communication hole 32 communicates with the upstream end 31 </ b> B of the flange 31. Therefore, the fluid easily flows from the fluid communication hole 32 to the fluid communication path 35.
Moreover, since the collar part 31 is formed over the perimeter, it is easy to receive the flow of a fluid. When the valve 3 opens and closes, the valve body portion 3C and the flange portion 31 receive fluid, so that the valve 3 can be opened even with a low differential pressure. Therefore, a circuit with little pressure loss can be provided.

  The outermost peripheral portion 31 </ b> A of the collar portion 31 is in contact with the sliding wall surface portion 24. A portion where the outermost peripheral portion 31A and the sliding wall surface portion 24 are in contact is referred to as a first guide G1. As shown in FIG. 4, in the enlarged view of the contact portion between the outermost peripheral portion 31 </ b> A and the sliding wall surface portion 24, a gap P is formed. The gap P is formed to be equal to or smaller than the opening of a filter for removing foreign matters such as chips and abrasive grains formed upstream of the coolant check valve 1. By setting the gap P to be equal to or smaller than the opening of the filter, foreign matter such as chips and abrasive grains larger than the gap P that has passed through the filter is elastic from between the outermost peripheral portion 31A of the flange portion and the sliding wall portion 24 There is no flow into the member chamber 75. Therefore, it is possible to prevent foreign matter such as chips and abrasive grains from biting into the elastic member 7. By preventing biting of foreign matter such as chips and abrasive grains, it is possible to prevent the occurrence of a bulk block.

  Further, the downstream end portion 31 </ b> C of the flange portion 31 is in contact with the other end 7 </ b> B of the elastic member 7. The elastic member 7 is in contact with the downstream end portion 31 </ b> C of the flange portion 31 and the elastic member contact portion 64, and the outer periphery thereof is surrounded by the housing 2 and the inner periphery thereof is surrounded by the valve 3. A region surrounded by the elastic member 7 is referred to as an elastic member chamber 75. Therefore, since the elastic member 7 is housed in the elastic member chamber 75 and is in a state separated from the fluid communication path 35, foreign matters such as chips and abrasive grains are not entangled.

  The outer peripheral wall surface 3 </ b> A of the valve 3 is in contact with the flow path wall surface 62 of the cap 6 in a slidable state. A portion where the outer peripheral wall surface 3A and the flow path wall surface 62 are in contact is referred to as a second guide G2. Due to the distance between the first guide G1 and the second guide G2, the parallelism of the valve 3 can be maintained when the valve 3 slides. Therefore, blurring of the valve 3 and the valve seat 26 can be prevented, and the valve 3 can be brought into contact with the valve seat 26 uniformly.

  A taper portion 33A having a tapered shape is formed on the valve end portion 33 corresponding to the upper surface of the cup-shaped bulb 3. By forming the taper portion 33A, foreign matters such as chips and abrasive grains accumulated in the valve end portion 33 when the valve 3 is opened can be pushed out. Specifically, as shown in FIG. 8, since the tapered portion 33A has a tapered shape, the foreign matter T1 is accumulated. Further, in the vicinity of the contact surface between the valve end portion 33 and the flow path wall surface 62, the flow of fluid is deteriorated, so that a reservoir portion in which the foreign matter T accumulates is formed. Therefore, the foreign matter T2 accumulates in the pool part. As shown in FIG. 9, when the valve 3 moves and slides on the flow path wall surface 62, the foreign matter T1 accumulated on the tapered portion 33A is pushed out. Furthermore, the foreign material T2 can be scraped off as the valve end 33 slides on the flow path wall surface 62. As shown in FIG. 10, the foreign matter T accumulated in the tapered portion 33 </ b> A rides on the flow of the fluid communication path 35 and flows downstream. As a result, the foreign matter T is eliminated. Therefore, since the taper portion 33A is formed at the valve end portion 33, the accumulation of the foreign matter T can be eliminated and the valve block can be prevented. Furthermore, since the taper portion 33A is formed, it has a self-cleaning mechanism capable of automatically flowing foreign matter such as chips and abrasive grains by sliding the valve 3.

  As shown in FIG. 1, the valve body portion 3 </ b> C corresponding to the bottom surface of the cup-shaped valve 3 is formed with a tapered surface 37 in the outer peripheral direction around the central axis of the valve 3. An O-ring 38 is formed on the tapered surface 37. The tapered surface 37 has an angle β with respect to a vertical line Q perpendicular to the central axis. In the present embodiment, the angle β is an inclination angle of 10 degrees or more and 20 degrees or less. By setting it to 10 degrees or more and 20 degrees or less, the valve 3 can be slid stably. That is, since the tapered surface 37 is formed on the valve 3, the valve 3 can be stabilized because the fluid flows uniformly around the valve 3 with a streamlined shape with respect to the flow path.

<Operation and effect of coolant check valve>
The opening operation of the coolant check valve that shifts from the closed state shown in FIG. 1 to the opened state shown in FIG. 2 will be described.
When the valve is opened, in the state shown in FIG. 1, the IN port pressure of the inflow portion 25 that is the IN port is made higher than the OUT port pressure of the cap channel 61 that is the OUT port (including the elastic force of the elastic member 7). Thereby, the receiving pressure of the valve 3 is superior to the elastic force of the elastic member 7 that is pressed in the direction of the inflow portion 25 that is the IN port. Therefore, as shown in FIG. 2, the valve 3 moves in the direction of the cap flow path 61, which is the OUT port, and the valve seat 26 and the valve body portion 3C are separated from each other to be opened.

  As shown in FIG. 3, when the coolant check valve 1 is fully opened, the fluid G flows in the flow path from the inflow portion 25 to the cap flow path 61. As shown in FIG. 3, the fluid G <b> 1 that has flowed in from the inflow portion 25 passes between the valve seat 26 and the valve body portion 3 </ b> C and flows to the cap flow path 61 through the fluid communication hole 32 and the fluid communication path 35. As the fluid, the flow indicated by the arrows of the fluid G1, the fluid G2, the fluid G3, and the fluid G4 is a mainstream.

  As shown in FIG. 3, there is no fluid flow in the elastic member chamber 75 when fully opened. The reason is that in the elastic member chamber 75, the downstream end 31C of the collar 31 abuts the other end 7B of the elastic member 7, the downstream end 31C of the collar 31 and the elastic member abutment 64, This is because the outer periphery is surrounded by the housing 2 and the inner periphery thereof is surrounded by the valve 3. Since the elastic member chamber 75 is surrounded and isolated, the inside of the elastic member chamber 75 when fully opened is completely isolated from the fluid communication path 35 and therefore there is no fluid flow. Therefore, as shown in FIG. 3, the fluid G <b> 6 diverted from the fluid G <b> 2 that may enter the elastic member chamber 75 changes the flow direction around the flange portion 31 and merges with the main fluid G <b> 2.

  More specifically, when fully opened, as shown in FIG. 4, the fluids G <b> 61 and G <b> 62 change the direction of flow around the flange portion 31. Since the fluids G61 and G62 change the flow direction between the outermost peripheral portion 31A and the sliding wall surface portion 24, foreign matters such as chips and abrasive grains accumulated between the outermost peripheral portion 31A and the sliding wall surface portion 24 are fluidized. G62 can be entrained and flow to the mainstream fluid G2. By allowing foreign matter such as chips and abrasive grains to flow into the mainstream fluid G2, it is possible to prevent biting into the elastic member 7 and to prevent the valve block.

  Furthermore, when the coolant check valve 1 moves in the fully open direction, the elastic member 7 contracts, and the volume of the elastic member chamber 75 decreases accordingly. Therefore, as shown in FIG. 7, the compressed fluid J51 in the elastic member chamber 75 is pushed out from the gap P between the outermost peripheral portion 31A and the sliding wall surface portion 24 and joins the mainstream as the fluid J61. When the fluid J51 flows out of the gap P, foreign matter such as chips and abrasive grains accumulated between the outermost peripheral portion 31A and the sliding wall surface portion 24 can be pushed out and flowed into the mainstream. Therefore, the coolant check valve 1 can be prevented from being bitten into the elastic member 7 not only when fully opened, but also when moving toward the fully opened state, thereby preventing a valve block. Although FIG. 7 shows a state immediately before full opening, when the valve 3 of the coolant check valve 1 moves in the opening direction and the volume of the elastic member chamber 75 becomes small, the fluid in the elastic member chamber 75 becomes a gap. Flows out of P. Therefore, the same effect can be obtained when heading in the valve opening direction.

  As shown in FIG. 5, when the coolant check valve 1 is opened by 70%, the fluid H flows from the inflow portion 25 to the cap channel 61 in the channel. In addition, although the code | symbol different from the fluid G of FIG.3 and FIG.4 was attached, the flowing fluid is the same. In the description, the flow direction of the fluid flowing in the fully open state and the 70% valve open state is different, so that the description is changed and described.

  As shown in FIG. 5, when the coolant check valve 1 is opened by 70%, the fluid H flows from the inflow part 25 to the cap channel 61 in the channel. As shown in FIG. 5, the fluid H <b> 1 that has flowed in from the inflow portion 25 flows between the valve seat 26 and the valve body portion 3 </ b> C and flows to the cap flow path 61 through the fluid communication hole 32 and the fluid communication path 35. As the fluid, a flow indicated by arrows of the fluid H1, the fluid H2, the fluid H3, and the fluid H4 is a mainstream. When the valve is 70% open as shown in FIG. 5, the main flow is the same as in the fully opened state shown in FIG.

  As shown in FIG. 5, when the valve is opened by 70%, the fluid H6 is diverted from the mainstream fluid H2, and the fluid H5 flows into the elastic member chamber 75. The reason is that the area of the elastic member chamber 75 is enlarged when the valve is 70% opened compared to when the valve is fully opened. Therefore, the fluids H6 and H5 flow into the expanded area of the elastic member chamber 75.

  More specifically, when the valve is 70% open, as shown in FIG. 6, there is a flow from the flow path R formed between the valve 3 and the cap 6 to the fluid H53. When the valve is opened 70%, the fluid H53 is drawn into the flow, and the fluid H51 and the fluid 52 also flow in the direction of the flow path R. Therefore, the fluid H <b> 6 that flows in the vicinity between the outermost peripheral portion 31 </ b> A and the sliding wall surface portion 24 is drawn toward the elastic member chamber 75. As the fluid H6 flows in the direction of the elastic member chamber 75, foreign matter such as chips and abrasive grains also flows, but the size of the foreign matter such as chips and abrasive grains is determined by Since it is larger than the length P between them, it does not flow into the elastic member chamber 75. Foreign matters such as chips and abrasive grains smaller than the gap P flow into the elastic member chamber 75 but flow out from the flow path R to the cap flow path 61. Further, when fully opened, as shown in FIG. 4, foreign matter such as chips and abrasive grains accumulated between the outermost peripheral portion 31 </ b> A and the sliding wall surface portion 24 can be drawn into the fluid G <b> 2 by the fluid G <b> 62. Further, as shown in FIG. 7, when the check valve moves in the fully open direction, the fluid J51 and J61 flow from the elastic member chamber 75, so that the chips and chips accumulated between the outermost peripheral portion 31 </ b> A and the sliding wall surface portion 24. Foreign matter such as abrasive grains can be flowed into the mainstream fluid J2.

The closing operation of the coolant check valve that shifts from the valve opening state shown in FIG. 2 to the valve closing state shown in FIG. 1 will be described.
When the valve is closed, in the state shown in FIG. 2, the OUT port pressure (including the elastic force of the elastic member 7) of the cap channel 61 that is the OUT port is set higher than the IN port pressure of the inflow portion 25 that is the IN port. As a result, the elastic force of the elastic member 7 exceeds the pressure received by the valve 3 that is pressed in the direction of the cap flow path 61 that is the OUT port. Therefore, as shown in FIG. 1, the valve 3 moves toward the inflow portion 25 that is an IN port, and the valve seat 26 and the valve body portion 3 </ b> C come into contact with each other so that the valve is closed.

<Modification>
Note that the present invention is not limited to the above-described embodiment, and various applications are possible without departing from the spirit of the invention.

  For example, in the above embodiment, four fluid communication holes 32 are formed, but four or less, or four or more can be formed. Increasing the number of fluid communication holes 32 increases the fluid flow, and decreasing the number decreases the fluid flow.

  For example, in the above embodiment, the other end 7 </ b> B of the elastic member 7 is in contact with the elastic member contact portion 64 of the cap 6, but it can also be in contact with a part of the housing 3.

DESCRIPTION OF SYMBOLS 1 Check valve for coolant 2 Housing 24 Inner peripheral wall surface 3 Valve 3A Outer peripheral wall surface 31 Head part 32 Fluid communication hole 35 Fluid communication path 6 Cap 7 Elastic member

Claims (5)

A hollow cylindrical housing, a cap connected to the housing, a cup-shaped valve that slides in the housing, and a fluid communication path that is disposed in the valve and that circulates fluid from the upstream side to the downstream side In the check valve for coolant, comprising a fluid communication hole for communicating the outer peripheral wall surface of the valve and the fluid communication path, and configured to open and close the fluid communication path by sliding the valve,
In the valve, a flange portion is formed over the entire circumference of the outer peripheral wall surface,
One end portion of the elastic member is in contact with the collar portion, and the other end portion of the elastic member is in contact with the housing or the cap;
The elastic member is formed between the outer peripheral wall surface, the inner peripheral wall surface of the housing, and the flange portion;
Check valve for coolant. The coolant check valve according to claim 1,
The fluid is a coolant liquid containing foreign matter such as chips and abrasive grains,
A filter for stopping the foreign matter is formed upstream of the housing;
The clearance between the outermost peripheral portion of the flange portion and the inner peripheral wall surface is equal to or less than the opening of the filter,
Check valve for coolant. In the coolant check valve according to claim 1 or 2,
The valve includes a first guide in which the flange portion comes into contact with the inner peripheral wall surface, and a second guide in which a downstream side wall surface of the fluid communication path comes into contact with the inner peripheral wall surface,
There is a distance between the first guide and the second guide;
Check valve for coolant. The coolant check valve according to any one of claims 1 to 3,
The valve body portion corresponding to the bottom surface of the cup-shaped valve is formed with a tapered surface in the outer peripheral direction around the central axis of the valve;
The tapered surface has an inclination of 10 degrees or more and 20 degrees or less with respect to a vertical line perpendicular to the central axis;
Check valve for coolant. The coolant check valve according to any one of claims 1 to 4,
The valve end corresponding to the upper surface of the cup-shaped valve is tapered;
Check valve for coolant.

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