JP2011168962A - Sluice valve for vacuum valve unit and vacuum valve unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sluice valve for vacuum valve unit, capable of being easily opened and dispensing with a fall preventing stopper. <P>SOLUTION: The sluice valve 4 for a vacuum valve unit includes a valve element section 41 blocking a vacuum pipe line 56; a valve rod section 42 to which the valve element section 41 is attached; a vertical pipe section 43 provided in the middle of the vacuum pipe line 56; and a valve lid section 44 attached to the vertical pipe section 43 and having an insert hole 44a to which the valve rod section 42 is inserted. A female thread groove is provided on the insert hole 44a of the valve lid section 44, and a male thread groove is provided on the outer periphery of the valve rod section 42 so as to be screwed to the male thread groove over the whole length of the range to be inserted to the insert hole 44a thereof. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a gate valve of a vacuum valve unit and a vacuum valve unit.

  In recent years, the use of vacuum sewer systems that collect sewage by vacuum pressure is increasing instead of natural sewer systems.

  In this vacuum sewer system, sewage discharged from residences and factories is stored in a sewage mass with a vacuum valve (vacuum valve unit), and when a predetermined amount is stored, it is vacuumed as a gas-liquid mixed flow with air by vacuum pressure. It is taken into the sewer pipe and transported.

  By the way, in each vacuum valve unit, since it is necessary to shut off the vacuum pressure during maintenance or the like, a gate valve is generally installed on the downstream side (vacuum pump side) of the vacuum valve.

  For example, in Patent Document 1, a vertical pipe is disposed in a sewage mass, an inflow pipe is connected from a side surface of the vertical pipe, and a valve body that closes the vertical pipe is moved up and down to thereby form a vacuum valve. The structure which opens and closes between vacuum sewage pipes is disclosed.

  According to this configuration, it is possible to provide a vacuum valve unit that can set the depth of the sewage mushroom to a desired depth and can easily connect the vacuum sewage pipe to the sewage mass.

Japanese Patent No. 2805520

  However, since the valve body is pushed by the differential pressure between the atmospheric pressure and the vacuum pressure when the valve is closed, it is difficult to lift the valve body manually. A stopper to prevent the body from falling was necessary.

  Accordingly, the present invention provides a gate valve of a vacuum valve unit that can be easily opened and that does not require a stopper for preventing a drop, and a vacuum valve unit including the gate valve of the vacuum valve unit. It is aimed.

  In order to achieve the above object, the gate valve of the vacuum valve unit of the present invention includes a valve body portion that closes the vacuum pipe line, a valve rod part to which the valve body part is attached, and a vertical valve provided in the middle of the vacuum pipe line. A gate valve of a vacuum valve unit comprising: a pipe part; and a valve lid part having an insertion hole that is attached to the vertical pipe part and through which the valve stem part is inserted, wherein the insertion hole of the valve lid part In addition, a female thread groove is threaded, and a male thread groove that engages with the female thread groove is provided on the outer periphery of the valve stem portion over the entire length of the range that is inserted into the insertion hole.

  Moreover, it can be set as the structure by which the sealing member is installed in the upper surface of the said valve body part which contact | connects the lower surface of the said valve cover part in a valve open state so that the said valve stem part may be enclosed.

  Furthermore, a seal member can be provided on the lower surface of the valve lid portion that is in contact with the upper surface of the valve body portion in a valve open state so as to surround an insertion hole through which the valve rod portion is inserted.

  And the vacuum valve unit of this invention is equipped with the gate valve of any of the above-mentioned vacuum valve units, and the said vacuum pipe line is a valve inclined with respect to the insertion direction of the said valve body part along inner periphery. A seat part is provided, and a seal member having an inclined outer peripheral part in contact with the valve seat part is disposed on the valve body part.

  As described above, the gate valve of the vacuum valve unit of the present invention includes a valve body part that closes the vacuum pipe line, a valve rod part to which the valve body part is attached, a vertical pipe part provided in the middle of the vacuum pipe line, and a vertical pipe And a valve lid portion having an insertion hole through which the valve stem portion is inserted, and a valve valve of the vacuum valve unit, and a female screw groove is screwed into the insertion hole of the valve lid portion. In addition, a male screw groove that is screwed into the female screw groove is provided on the outer periphery of the valve stem portion over the entire length of the range inserted through the insertion hole.

  Therefore, by rotating the valve stem and moving the valve body, the force required to open and close the valve can be reduced, and the valve can be opened even if a differential pressure between atmospheric pressure and vacuum pressure acts. The state can be maintained.

  In addition, a sealing member is installed on the upper surface of the valve body portion that is in contact with the lower surface of the valve lid portion in the valve open state so as to surround the valve rod portion, so that the valve lid and the valve rod are screwed together in the fully opened state. Can be sealed, and the fully open state can be confirmed by the presence or absence of air leakage noise.

  Furthermore, a seal member is provided on the lower surface of the valve lid portion that contacts the upper surface of the valve body portion in the valve open state so as to surround the insertion hole through which the valve rod portion is inserted, so that the valve lid and valve can be opened in the fully opened state. In addition to sealing the threaded part of the rod, the fully open state can be confirmed by the presence or absence of air leakage noise.

  The vacuum valve unit of the present invention includes the gate valve of any one of the above-described vacuum valve units, and the vacuum seat includes a valve seat portion that is inclined with respect to the insertion direction of the valve body portion along the inner periphery. And a seal member having an inclined outer peripheral portion that abuts against the valve seat portion is disposed in the valve body portion.

  Accordingly, since the valve seat portion and the outer peripheral portion of the seal member are in contact with each other in the closed state, the valve closed state can be maintained by pressing the two together due to the differential pressure between the atmospheric pressure and the vacuum pressure.

It is sectional drawing explaining the structure of the state which closed the gate valve of the vacuum valve unit of an Example. It is explanatory drawing explaining the whole structure of a vacuum type sewer system. It is explanatory drawing explaining the structure of a vacuum valve unit. It is sectional drawing explaining the structure of a valve body part. (A) is a general view, (b) is an enlarged view of the A part of (a). It is sectional drawing explaining the structure of the valve cover part of another Example. (A) is a general view, (b) is an enlarged view of the A part of (a). It is sectional drawing explaining the structure of the state which opened the gate valve of the vacuum valve unit of an Example.

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

  First, the whole structure of the vacuum-type sewer system S provided with the vacuum valve unit U of this invention is demonstrated using FIG.

  In the vacuum sewer system S of this embodiment, as shown in FIG. 2, sewage discharged from a home 91 or a factory (not shown) flows into the vacuum valve unit U through a natural flow down pipe 92.

  Subsequently, the sewage that has flowed into the vacuum valve unit U passes through the lower part 93 and the lift part 94 as vacuum sewage pipes sequentially by the vacuum pressure generated in the vacuum station 96 (pressure lower than the atmospheric pressure). It is conveyed as a gas-liquid mixed flow so as to pass.

  This vacuum pump type vacuum station 96 generates vacuum pressure by sucking air in a sealed tank 96b by a vacuum pump 96a, and keeps the inside of the vacuum sewage pipe in a vacuum state of about 0.4 atm. Therefore, the sewage is sucked and collected from each household. Thereafter, the sewage is sent to a sewage treatment plant or the like by a pressure pump 96c.

  The vacuum station 96 may be an ejector system instead of the above-described vacuum pump system in a small-scale facility or the like.

  The above-mentioned vacuum sewer system S is a system that forcibly collects and conveys sewage by the differential pressure between vacuum and atmospheric pressure, and the embedding depth of the vacuum sewage pipe is shallow, and it is easy to avoid buried objects. Sewage with vacuum valve has features such as no power supply, no leakage of sewage, no need to clean pipes, and less scum.

  As shown in FIG. 3, the vacuum valve unit U is stored in a cylindrical main body 50, an inflow pipe 51 for allowing sewage to flow in, a storage tank 52 for receiving and temporarily storing the sewage that has flowed in, and the vacuum valve unit U. A suction pipe 53 that is inserted into the sewage and takes the sewage into the vacuum discharge pipe 56, a water level detection pipe 54 that is inserted into the stored sewage and detects a change in the liquid level in the storage tank 52, and a vacuum sewage pipe by vacuum pressure A vent pipe 55 that supplements air after the sewage sucked into the passage, a vacuum exhaust pipe 56 connected to the vacuum sewage pipe and evacuated, and a sewage that opens when a vacuum valve 2 malfunctions. , The vacuum valve 2 provided between the vacuum exhaust pipe 56 and the suction pipe 53, and the vacuum valve 2 due to the pressure fluctuation caused by the liquid level fluctuation in the water level detection pipe 54. Vacuum valve controller 3 to open and close Vacuum is buried in the ground comprises a, the gate valve 4 is closed so as not to act upon.

  The vacuum valve 2 is opened and closed by the vacuum valve controller 3 so that when the water level rises, vacuum pressure is introduced into the suction pipe 53 to suck in sewage and the like in the storage tank 52, and when the water level falls, the vacuum valve 2 enters the storage tank 52. Store sewage.

  Further, the vacuum valve controller 3 detects a rise in the water level in the water level detection pipe 54, and operates to open the vacuum valve 2 when the water level rises and close the vacuum valve 2 when the water level falls.

  As shown in FIG. 1, the gate valve 4 of the present embodiment includes a valve body portion 41 that closes the vacuum pipe line, an externally threaded valve rod part 42 to which the valve body part 41 is attached, and a halfway of the vacuum pipe line. A vertical tube portion 43 provided in the horizontal tube portion, a horizontal tube portion 46 joined to the vertical tube portion 43 from the side, and a valve lid portion 44 having an insertion hole 44a attached to the vertical tube portion 43 and through which the valve stem portion 42 is inserted. And a handle portion 45 for manually rotating the valve stem portion 42.

  The valve body 41 includes a short cylindrical main body 41a formed of a metal such as stainless steel, a seal member 41b fitted into a fitting recess 41f on the lower surface of the main body 41a, and presses the seal member 41b from below. A presser plate 41c and a nut 41d screwed to the tip of the valve stem portion 42 are provided.

  As shown in FIG. 4A, the main body 41a has an insertion hole 41e for inserting the valve stem portion 42 in the center, a shallow fitting recess 41f for fitting the seal member 41b on the lower surface, and an O-ring on the upper surface. A circular groove 41g for fitting 62 is formed.

  In this embodiment, the circular groove 41g is opposed to the valve lid portion 44, and the insertion hole 41e through which the valve stem portion 42 is inserted on the upper surface that is in contact with the lower surface of the valve lid portion 44 when the valve is open (fully open). Is formed so as to surround.

  Furthermore, an O-ring 62 that is elastically deformed to hold the vacuum pressure of the vacuum pipe line in close contact with the lower surface of the valve lid portion 44 in the valve open (fully open) state is pushed into the circular groove 41g. Is in a state of protruding from the circular groove 41g (see FIG. 1).

  4B, the circular groove 41g has a chamfered chamfered portion 41h, a straight portion 41i, and a tapered portion 41j that provides a margin for deformation of the O-ring 62. The arc portion 41k and a bottom surface portion 41l that applies a reaction force to the O-ring 62 are configured so that the O-ring 62 that is pushed in and fitted does not fall off.

  That is, the O-ring 62 once fitted is configured not to come out by configuring the width between the opposing straight portions 41i of the circular groove 41g to be narrower than the diameter of the O-ring 62.

  The seal member 41b is formed in a disc shape with a synthetic rubber such as EPDM, and has an inclined surface on the outer peripheral portion so as to contact the inclined valve seat portion 43a without a gap. It has a cross-sectional shape.

  The valve stem portion 42 is formed in a rod shape by a metal such as stainless steel, and includes a hexagonal portion 42a for fixing the handle portion 45, a shaft portion 42b having a thread groove threaded on the outer peripheral surface, and a valve body portion 41. The stopper part 42c which abuts is provided.

  In this embodiment, the male screw threaded into the shaft portion 42b is engaged with the female screw groove over substantially the entire length of the range through which the valve body portion 41 is inserted into the insertion hole 44a corresponding to the fully open position. The groove is threaded. An O-ring 63 is fitted on the outer periphery in the vicinity of the tip of the valve stem portion 42, and the space between the inner peripheral surface of the insertion hole 41 e of the valve body portion 41 is sealed.

  Further, the vertical pipe portion 43 is formed in a cylindrical shape by a synthetic resin such as polyethylene, and is arranged vertically as a part constituting the vacuum pipe in the middle of the vacuum discharge pipe 56 which is a vacuum pipe, Its upper part protrudes from the vacuum line. A female screw groove is formed on the inner periphery of the upward projecting portion, and the valve lid portion 44 is screwed together.

  In addition, a horizontal pipe portion 46 serving as a vacuum pipe line is joined to the vertical pipe portion 43 from the side, and a valve body portion is provided along the inner circumference immediately downstream (vacuum pump side) of the joining portion. An annular valve seat 43a that is inclined with respect to the insertion direction (vertical direction) 41 is provided.

  The valve lid portion 44 is formed of a metal such as stainless steel in a short columnar shape, and an insertion hole 44a through which the valve rod portion 42 is inserted is formed at the center, and the valve rod is inserted into the insertion hole 44a. A female screw groove that is screwed into the male screw groove of the portion 42 is threaded.

  In addition, a male thread groove is formed on the outer periphery of the valve lid portion 44 to be screwed with the protruding portion of the vertical tube portion 43, and an O-ring for sealing between the valve lid portion 44 and the vertical tube portion 43. A groove for fitting 61 is formed.

  Even if the metal valve lid portion 44 is screwed into the synthetic resin vertical tube portion 43 in this manner, a force in the direction of pressing (tightening direction) acts due to the differential pressure between the atmospheric pressure and the vacuum pressure. The valve lid portion 44 is never loosened.

  In the present embodiment, as described above, the example in which the circular groove 41g is provided in the valve body portion 41 and the O-ring 62 is fitted is described. However, the present invention is not limited to this, and the valve lid portion 44 has a circular shape. A groove 44g may be provided to fit the O-ring 62.

  That is, as shown in FIG. 5 (a), the valve lid portion 44 has an insertion hole 44a on the lower surface facing the valve body portion 41 and in contact with the upper surface of the valve body portion 41 in the valve open (fully open) state. A circular groove 44g may be formed so as to surround, and an O-ring that is elastically deformed may be installed in the circular groove 44g.

  In this case, as shown in FIG. 5B, the circular groove 44g has a cross-section similar to the circular groove 41g, such as a chamfered portion 44h, a straight portion 44i, a tapered portion 44j, an arc portion 44k, and a bottom surface portion. 44l.

  Next, the operation of the gate valve 4 of the vacuum valve unit U of the present embodiment will be described with reference to FIGS.

  First, the valve open (full open) state that is always constant will be described with reference to FIG. In a normal state where the vacuum valve 2 is not broken or the like, the gate valve 4 is open.

  In this valve open state, the handle 45 is rotated to raise the valve stem 42, and the valve body 41 fixed to the valve stem 42 is also in a position where the O-ring 62 contacts the valve lid 44. Has been raised.

  That is, in this valve open state, the upper part of the O-ring 62 installed so as to protrude from the upper surface of the valve body 41 is in contact with the lower surface of the valve lid 44 and is crushed and elastically deformed. It is in a state.

  Therefore, the male screw groove of the valve stem portion 42 and the female screw groove of the valve lid portion 44 rotate by being pressed against each other by the resultant force of the elastic reaction force of the O-ring 62 and the differential pressure between the atmospheric pressure and the vacuum pressure. It is supposed not to.

  Next, the closed valve state (fully closed) during maintenance will be described with reference to FIG. During maintenance, the vacuum valve 2 may be removed, but it is necessary to maintain the vacuum pressure even when the vacuum valve 2 is removed so as not to place a burden on the vacuum station 96. Therefore, before removing the vacuum valve 2, the gate valve 4 is closed to shut off the vacuum pressure on the side closer to the vacuum station 96 than the vacuum valve 2.

  In this closed state, the handle 45 is rotated to lower the valve stem 42, and the valve body 41 fixed to the valve stem 42 is also in a position where the seal member 41b contacts the valve seat 43a. Has been lowered.

  That is, in this valve-closed state, the inclined surface of the seal member 41b installed on the lower surface of the valve body portion 41 is in contact with and in close contact with the inclined surface of the valve seat portion 43a to block the vacuum pressure. .

  Therefore, the seal member 41b is pressed in the direction of the valve seat portion 43a by the differential pressure between the atmospheric pressure and the vacuum pressure, but the seal member 41b is held in a pressed state because it is supported by the presser plate 41c. .

  Next, effects of the gate valve 4 of the vacuum valve unit U of this embodiment will be listed and described.

  (1) Thus, the gate valve 4 of the vacuum valve unit U of the present embodiment includes a valve body portion 41 that closes the vacuum exhaust pipe 56 that is a vacuum pipe, and a valve rod portion 42 to which the valve body portion 41 is attached. A vacuum valve unit comprising: a vertical pipe portion 43 provided in the middle of the vacuum exhaust pipe 56; and a valve lid portion 44 attached to the vertical pipe portion 43 and having an insertion hole 44a through which the valve rod portion 42 is inserted. U gate valve 4.

  Therefore, during maintenance or the like, the valve body 41 closes the vacuum discharge pipe 56 to shut off the vacuum pressure at the position of the gate valve 4, so that the vacuum pump 96 a of the vacuum station 96 is not burdened. .

  A female screw groove is threaded into the insertion hole 44a of the valve lid portion 44, and the outer periphery of the valve stem portion 42 is screwed into the female screw groove over the entire length of the range inserted through the insertion hole 44a. A male thread groove is provided.

  Accordingly, the handle portion 45 is manually rotated, and the valve stem portion 42 is rotated with respect to the valve lid portion 44 to move the valve body portion 41 up and down. In addition, the valve open state can be maintained even when a differential pressure between the atmospheric pressure and the vacuum pressure acts.

  That is, when the valve is opened from the closed state, the valve body 41 is pushed downward by the differential pressure between the atmospheric pressure and the vacuum pressure, and therefore it is difficult to pull the valve body 41 up directly by human power. .

  On the other hand, if the valve stem portion 42 and the valve lid portion 44 are configured to be screwed together as shown in the present embodiment, the valve body portion 41 is rotated with a small force by rotating the handle portion 45. Can be raised.

  Furthermore, in the valve open state, the male screw groove of the valve stem portion 42 and the female screw groove of the valve lid portion 44 are pressed against each other, thereby preventing the valve stem portion 42 and the valve body portion 41 from moving downward. . For this reason, a half-cracked stopper member for preventing the fall is unnecessary.

  In addition, if a male thread groove is provided in the substantially entire length of the valve stem portion 42 so that the valve stem portion 42 is not sealed, the valve stem portion 42 is sealed with an O-ring so that the valve stem portion 42 hardly moves. And the valve body 41 or the like is not damaged due to sudden movement.

  And the gate valve 4 of a present Example is mainly comprised by the valve body part 41, the valve rod part 42, the vertical pipe part 43, and the valve cover part 44, and while the whole structure is simplified, the whole structure is simplified. Since the size can be reduced, the gate valve 4 can be disposed inside the vacuum valve unit U.

  (2) In addition, an O-ring 62 as a seal member is installed on the upper surface of the valve body portion 41 that is in contact with the lower surface of the valve lid portion 44 in a valve-opened state so as to surround the valve rod portion 42, so that it is fully opened. In addition to being able to seal the screwed portion between the valve lid portion 44 and the valve stem portion 42 in the state, the fully opened state can be confirmed by the presence or absence of air leakage noise.

  That is, if a male screw groove is screwed on the outer periphery of the valve stem portion 42, it is difficult to shut off the vacuum pressure at the outer peripheral portion of the valve stem portion 42, but the O-ring 62 on the upper surface of the valve body portion 41 has a valve lid. The vacuum pressure can be cut off by being in close contact with the lower surface of the portion 44.

  In addition, when the O-ring 62 is not in close contact with the lower surface of the valve lid portion 44 and a gap is formed, a sound for sucking air is generated from the gap. it can.

  In addition, in this case, since the O-ring 62 does not have a portion that slides with respect to the valve stem portion 42, the O-ring 62 is not worn by friction with the valve stem portion 42, and the durability of the O-ring 62 is improved.

  (3) Similarly, an O-ring 62 is installed on the lower surface of the valve lid portion 44 that is in contact with the upper surface of the valve body portion 41 in the valve open state so as to surround the insertion hole 44a through which the valve rod portion 42 is inserted. Thus, the screwed portion of the valve lid portion 44 and the valve stem portion 42 can be sealed in the fully opened state, and the fully opened state can be confirmed by the presence or absence of air leakage noise.

  That is, when a male screw groove is screwed on the outer periphery of the valve stem portion 42, it is difficult to shut off the vacuum pressure at the outer peripheral portion of the valve stem portion 42, but the seal member on the lower surface of the valve lid portion 44 serves as the valve body portion. By adhering to the upper surface of 41, the vacuum pressure can be cut off.

  In addition, when the O-ring 62 is not in close contact with the upper surface of the valve body 41 and a gap is formed, a sound is generated to suck air from the gap, so it is possible to confirm whether or not the O-ring 62 is in close contact. it can.

  (4) The vacuum valve unit U of the present embodiment includes the gate valve 4 of any of the vacuum valve units U described above, and the vertical pipe portion 43 of the vacuum exhaust pipe 56 that is a vacuum pipe line includes A valve seat 43a that is inclined with respect to the insertion direction of the valve body 41 along the circumference is provided, and a seal member 41b having an inclined outer peripheral portion that contacts the valve seat 43a is disposed on the valve body 41. Has been.

  Accordingly, since the valve seat portion 43a and the outer peripheral portion of the seal member 41b are in contact with each other in the valve closed state, the valve closed state can be maintained by pressing them together due to the differential pressure between the atmospheric pressure and the vacuum pressure.

  That is, the seal member 41b and the valve seat portion 43a are inclined to face each other, and the vacuum pressure acts in the direction of closing the valve, so that the seal member 41b and the valve seat portion 43a are kept in contact with each other. It becomes.

  In addition, by providing the vertical pipe portion 43 in this way, the position of the vacuum exhaust pipe 56 exiting from the vacuum valve unit U can be set to a deep position even if the vacuum valve unit U is buried in a shallow position. Therefore, the earth covering of the vacuum pipe line can be secured.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to the present invention. included.

  For example, in the above-described embodiment, the case where the outer peripheral portion of the seal member 41b of the valve body 41 and the valve seat 43a are inclined has been described. However, the present invention is not limited to this, and the valve body 41 and the valve seat are not limited thereto. Any structure may be used as long as it does not move by hitting the portion 43a.

  Furthermore, in the said Example, although the valve body part 41 demonstrated the case where it comprised by the main body 41a, the sealing member 41b, the pressing board 41c, nut 41d, etc., it is not limited to this, The whole is made of synthetic rubber. It may be configured.

U Vacuum valve unit 2 Vacuum valve 3 Vacuum valve controller 4 Gate valve 41 Valve body part 41a Main body 41b Seal member 41e Insertion hole 41g Circular groove 42 Valve rod part 42b Shaft part 43 Vertical pipe part 43a Valve seat part 44 Valve cover part 44a Insertion Hole 44g Circular groove 50 Main body 51 Inflow pipe 52 Reservoir tank 53 Suction pipe 54 Water level detection pipe 55 Ventilation pipe 56 Vacuum exhaust pipe (vacuum line)
62 O-ring (seal member)

Claims (4)

A valve body part that closes the vacuum pipe line, a valve rod part to which the valve body part is attached, a vertical pipe part provided in the middle of the vacuum pipe line, and a valve pipe part that is attached to the vertical pipe part and is inserted therethrough A valve valve portion having an insertion hole, and a gate valve of a vacuum valve unit comprising:
A female screw groove is threaded into the insertion hole of the valve lid portion, and a male screw groove is formed on the outer periphery of the valve stem portion over the entire length of the range inserted through the insertion hole. A gate valve of a vacuum valve unit, wherein a thread groove is provided.   2. The vacuum valve unit according to claim 1, wherein a seal member is provided on an upper surface of the valve body portion that is in contact with a lower surface of the valve lid portion in a valve open state so as to surround the valve rod portion. Gate valve.   The sealing member is installed in the lower surface of the said valve cover part which contact | connects the upper surface of the said valve body part in a valve opening state so that the penetration hole which penetrates the said valve stem part may be enclosed. A gate valve of the vacuum valve unit described.   A gate valve of the vacuum valve unit according to any one of claims 1 to 3, wherein the vacuum pipe is inclined with respect to the insertion direction of the valve body portion along an inner periphery. A vacuum valve unit characterized in that a seat member is provided, and a seal member having an inclined outer peripheral portion that comes into contact with the valve seat portion is disposed on the valve body portion.

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