JP2009216211A - On-off valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem on a conventional on-off valve which uses a rubber member for energizing a valve element cover to the side of a valve element and is mounted in a state of being compressed to some extent to avoid the movement of the valve element cover until pressure in a secondary chamber reaches predetermined pressure, that the rubber member has characteristics of abruptly increasing its elastic modulus when compressed and deformed and requires great power for further deformation when elastically deformed to some extent, and therefore other components including a retainer retaining the rubber member are plastically deformed while the rubber member is not elastically deformed when a degree of freezing water in the secondary chamber becomes higher to increase the displacement of the valve element cover. <P>SOLUTION: This on-off valve has a slit groove 12 as a pressure releasing means for releasing pressure from the secondary chamber 5 while opening the secondary chamber 5 to the outside when the valve element cover 6 is moved by a predetermined distance d. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an on-off valve provided with a diaphragm-like valve body such as a water stop valve used for a main stop water heater, for example.

  As a conventional on-off valve of this type, a diaphragm type valve body is provided, and a primary chamber surrounding an outlet opened and closed by the valve body, and a valve on the opposite side of the primary chamber with the valve body interposed therebetween. A secondary chamber surrounded by a body and a valve body cover, water pressure in the primary chamber is introduced into the secondary chamber, and the valve body is pressed against the outlet by the pressure in the introduced secondary chamber. A water stop valve that is a kind of on-off valve that closes an outlet is known (see, for example, Patent Document 1).

  In this water stop valve, the water in the secondary chamber is full when the outlet is closed, which may cause the water in the secondary chamber to freeze when the temperature is low, such as in winter. Since the secondary chamber is closed, when water in the secondary chamber begins to freeze, the pressure increases, and the valve body and the valve body cover constituting the secondary chamber are damaged.

Therefore, in the one described in Patent Document 1, a rubber member is provided to hold the valve body cover movably in a direction away from the valve body and urge the valve body cover in a direction toward the valve body. When the pressure in the chamber exceeds a predetermined pressure, the valve body cover moves in a direction away from the valve body while compressing and deforming the rubber member, and the pressure increase in the secondary chamber is alleviated.
Japanese Patent No. 3807908 (FIG. 1)

  The conventional water stop valve uses a rubber member to urge the valve body cover toward the valve body. And it attaches in the state compressed to some extent so that a valve body cover may not move until the pressure in a secondary chamber turns into predetermined pressure.

  When the rubber member is compressed and deformed, the rubber member has a characteristic that the elastic coefficient increases abruptly. For this reason, when the degree of water freezing in the secondary chamber increases and the amount of movement of the valve body cover increases, the rubber member does not elastically deform and other parts such as a holding plate holding the rubber member are plastically deformed. This causes the problem of end up.

  In view of the above problems, an object of the present invention is to provide an on-off valve that does not cause a portion that undergoes plastic deformation when water in a secondary chamber freezes.

  In order to solve the above-described problems, an on-off valve according to the present invention includes a diaphragm-type valve body, a primary chamber surrounding an outlet opened and closed by the valve body, and a primary chamber sandwiching the valve body. A secondary chamber surrounded by a valve body and a valve body cover is provided on the opposite side, and water pressure in the primary chamber is introduced into the secondary chamber, and the valve body is flowed out by the pressure in the introduced secondary chamber. In the open / close valve that closes the outlet by pressing against the valve body, the valve body cover is movably held in a direction away from the valve body, and an urging means for urging the valve body cover in the direction toward the valve body is provided. When the pressure in the secondary chamber exceeds the predetermined pressure and moves a predetermined distance in the direction away from the valve body against the biasing force of the biasing means, the secondary chamber is opened to the outside and the pressure in the secondary chamber is reduced. A pressure relief means for releasing the pressure is provided.

  In the above configuration, when the pressure in the secondary chamber rises, the valve body cover moves in a direction away from the valve body. However, the valve body cover does not relieve the pressure rise in the secondary chamber only by moving the valve body cover. The secondary chamber was opened to the outside when it moved a predetermined distance, so that the pressure increase in the secondary chamber was alleviated.

  As is clear from the above description, when the water in the secondary chamber freezes and the pressure rises, the present invention does not relieve the pressure increase only by moving the valve body cover, but the valve body cover moves by a predetermined distance. At that time, the secondary chamber is opened to the outside to alleviate the pressure increase in the secondary chamber, so that no large stress is applied to each member, and as a result, none of the members is plastically deformed.

  Reference numeral 1 denotes a water stop valve portion which is a part of a water system valve unit built in the main stop water heater. The main body 11 of the water stop valve portion 1 is hollow, and an outflow pipe 2 is provided in the hollow portion. And the primary chamber 3 is formed so that the outflow port 21 which is the inlet_port | entrance of this outflow pipe 2 may be enclosed. The outlet 21 is opened and closed by a diaphragm type valve element 4. In the state shown in the drawing, the outlet 21 is closed by the valve body 4, but when the valve body 4 moves in the right direction in the figure, the outlet 21 is opened and water in the primary chamber 3 flows to the outlet pipe 2. Flowing.

  The valve body 4 is provided with a pilot hole 41 facing the primary chamber 3, and the water pressure in the primary chamber 3 acts on the secondary chamber 5 through the pilot hole 41. That is, the water in the primary chamber 3 enters the secondary chamber 5 through the pilot hole 41, and the water pressure in the primary chamber 3 and the water pressure in the secondary chamber 5 become equal. Since the pressure receiving area of both water pressures is wider on the secondary chamber 5 side, the force that pushes the valve element 4 to the left side from the secondary chamber 5 side becomes larger, and the valve element 4 is pressed against the outlet 21 to close the valve. State is maintained.

  The valve body 4 is provided with a communication hole 42 facing the outflow pipe 2 at the center, and the communication hole 42 is closed by a closing valve 51. The stop valve 51 is always urged by a spring 52 in a direction to close the communication hole 42. A valve shaft 53 is connected, and the tip of the valve shaft 53 penetrates the valve body cover 6 and protrudes to the outside. A top 54 is attached to the exposed portion of the valve shaft 53.

  A valve-opening lever L is engaged with the top 54, and when the lever L moves the top 54 in the right direction and moves it in the direction in which the valve shaft 53 is pulled out, the closing valve 51 is separated from the communication hole 42. Then, the secondary chamber 5 communicates with the outflow pipe 2, and the pressure in the secondary chamber 5 rapidly decreases. Since the water pressure in the primary chamber 3 remains high, the valve body 4 is pushed rightward by the water pressure in the primary chamber 3 and the outlet 21 is opened.

  As described above, since the secondary chamber 5 is always filled with water during use, the water in the secondary chamber 5 may freeze when the outside air temperature is low as in winter. Therefore, the valve body cover 6 is configured to be movable in the direction away from the valve body 4, that is, the direction in which the volume of the secondary chamber 5 increases, and the valve body cover 6 is not prepared depending on the occurrence of water hammer or the maximum water pressure. The valve body cover 6 was urged toward the valve body 4 by the pressing rubber 61 so as not to move. The pressing rubber 61 is bonded to the pressing plate 62.

  The valve body cover 6 and the main body 11 are sealed with a ring-shaped seal 60. Further, slit grooves 12 as shown in the figure were formed on the sliding surface of the seal 60. Then, when the valve body cover 6 moves a distance d which is a predetermined distance, the seal 60 exceeds the end of the slit groove 12. When the seal 60 exceeds the end of the slit groove 12, the secondary chamber 5 communicates with the outside through the slit groove 12. Then, the water in the secondary chamber 5 flows out through the slit groove 12, and the pressure in the secondary chamber 5 decreases. The outflowed water was drained from the drain hole 13. Moreover, although the slit groove | channel 12 was provided only in one place in the thing of illustration, you may form multiple pieces as needed.

  In the above-described embodiment, the pressure relief means is configured by the slit groove 12, but the distance between the end surface 6a of the valve body cover 6 and the lever L may be set to the distance d, for example. When the valve body cover 6 is moved by the distance d, the end face 6a comes into contact with the lever L, and when the valve body cover 6 is further moved, the closing valve 51 is moved rightward in the drawing together with the valve shaft 53. Then, the communication hole 42 is opened, the water in the secondary chamber 5 flows out to the outflow pipe 2, and the pressure in the secondary chamber 5 decreases. Thus, the pressure relief means may be configured by setting the distance between the end face 6a and the lever L to the distance d.

  Further, as shown in FIG. 2, a drain hole 64 may be provided in the valve body cover 6, and the drain hole 64 may be closed by a plug portion 73. The plug 73 is formed at one end of the shaft member 7, and the other end of the shaft member 7 is held by the flanges 71 and 72 so as not to move in the axial direction while being passed through the through hole 63 provided in the holding plate 62. I let you. In this configuration, the plug 73 is configured to be removed from the drain hole 64 when the valve body cover 6 moves a distance d in the right direction in the drawing. When the stopper 73 is removed from the drain hole 64, the secondary chamber 5 communicates with the outside through the drain hole 64, and the water in the secondary chamber 5 flows out through the drain hole 64.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

The figure which shows the structure of one embodiment of this invention The figure which shows the structure of other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stop valve part 2 Outflow pipe 3 Primary chamber 4 Valve body 5 Secondary chamber 6 Valve body cover 7 Shaft member 11 Main body 12 Slit groove 21 Outlet 41 Pilot hole 42 Communication hole

Claims (1)

  A diaphragm-type valve body is provided, and is surrounded by a valve body and a valve body cover on the opposite side of the primary chamber with the valve body sandwiched between a primary chamber that surrounds an outlet that is opened and closed by the valve body. An open / close valve that introduces water pressure in the primary chamber into the secondary chamber, closes the outlet by pressing the valve element against the outlet with the pressure in the introduced secondary chamber. The valve body cover is movably held in a direction away from the valve body, and biasing means for biasing the valve body cover in the direction toward the valve body is provided, and the pressure in the secondary chamber exceeds a predetermined pressure. An on-off valve provided with pressure relief means for opening the secondary chamber to the outside and releasing the pressure in the secondary chamber when moved a predetermined distance in the direction away from the valve body against the urging force of the urging means .

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