JPH0735857U - Valve gasket - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a gasket for a valve which, when the valve and the base are separated from each other, is adsorbed to one of them and does not separate. [Structure] The gasket 11 is provided with a plurality of openings for communicating the valve 2 and the port of the base 3, and both sealing surfaces thereof are
An inner rib 12 that surrounds each opening, an outer rib 13 that is outside thereof, and a closed space 14 that is closed to the outside between these ribs 12 ,. [Effect] Even if the valve and the base are separated from each other, the gasket does not stick to the valve or the base due to the suction force of the closed space.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve gasket that seals between a valve and a base.

[0002]

[Prior art]

 6 and 7 show a known valve gasket 1 for sealing between a valve 2 and a base 3 such as a base or a manifold. The valve gasket 1 is made of an elastic material such as synthetic rubber. A plurality of openings 4, ..., which are integrally molded and allow the plurality of ports opened in the valve 2 to individually communicate with the corresponding ports of the base 3, are provided on both sealing surfaces. .. The rib 5 that seals the periphery of is formed integrally. However, the above-mentioned known gasket 1 is troublesome to reassemble because the gasket 1 easily separates from the valve 2 and the base 3 when the valve 2 and the base 3 are separated for maintenance or the like. .

[0003]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to provide a valve gasket that does not stick to one of the valves and the base, even if the base is separated.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a valve having a plurality of openings for individually communicating a plurality of ports opened in the valve and the base, and sealing between the valve and the base. In the gasket for valves, the above-mentioned gasket for valves is provided on the sealing surface facing the valve and the base with respect to the inside ribs surrounding each opening, the outside ribs on the outside, and the outside between these ribs. It is characterized by having a closed closed space. In order to solve the same problem, the valve gasket is characterized in that the volume of the closed space on one sealing surface is made larger than the volume of the closed space on the other sealing surface.

[0005]

[Action]

 If a gasket is interposed between the valve and the base and these are tightened by appropriate tightening members, the inner and outer ribs provided on both sealing surfaces will be compressed, and the pressure in the closed space between these ribs will be atmospheric pressure. Since the pressure is slightly lower, the suction force is generated between the gasket, the valve, and the sealing surface of the base. Therefore, even if the valve and the base are separated, the gasket does not stick to either the valve or the base and separate.

Further, by changing the volume of the closed space between the two seal surfaces, the seal surface on the closed space side having a large volume faces the valve or the base that faces the seal surface on the closed space side having a small volume. Strongly adheres to. Therefore, by facing the sealing surface on the closed space side having a large volume to the valve or the base, it is possible to select a member to which the gasket is adsorbed when the valve and the base are separated.

[0007]

【Example】

 1 and 2 show a first embodiment of the present invention. This valve gasket 11 seals between the valve 2 and the base 3 as shown in FIG. It has openings P, A, B and EA, EB for individually communicating the ports, the two output ports and the discharge port with the corresponding ports of the base 3 (each port is not shown), synthetic rubber, etc. It is molded integrally with the elastic material.

The gasket 11 has inner ribs 12, ... Enclosing the periphery of the supply opening P and the output openings A, B, and an outer rib 13 having substantially the same height as the outer ribs 13 on the outer surfaces thereof. A closed space 14 which is formed in the body and is closed to the outside is formed between these ribs 12, ..., And 13. In FIG. 1, Pa and Pb are pilot openings for communicating the pilot port of the valve 2 with the corresponding port of the base 3, and 16 and 16 are through holes for fastening members (not shown) such as bolts. Since a large fluid pressure does not act on the exhaust openings EA, EB and the pilot openings Pa, Pb, the inner rib 12 and the closed space 14 are not provided around these openings in the illustrated example, It can be provided as needed. Further, it goes without saying that the number of openings is not limited to five.

When the valve gasket 11 is interposed between the base 3 and the valve 2 and is tightened by a tightening member such as a bolt, the ribs 12, ... And 13, 13 are compressed. Therefore, the air pressure in the closed spaces 14, 14 between these ribs becomes slightly lower than the atmospheric pressure, so that the gasket 11 sticks to the sealing surfaces of the valve 2 and the base 3. Therefore, the sealability of the gasket can be improved. When the valve 2 and the base 3 are separated for maintenance or the like, the gasket 11 is adsorbed to either the valve 2 or the base 3 and does not separate because the air pressure in the closed spaces 14 and 14 is low. Therefore, it is easy to reassemble them.

FIG. 3 shows a second embodiment of the present invention. In this gasket 21, the heights of the inner ribs 22 ,. .. and the outer ribs 26 are made higher so that the volume of the closed space 24 between the ribs 22, .. and 23 is larger than the volume of the closed space 27 between the ribs 25 ,. In the gasket 21 of the second embodiment, since the volume of the closed space 24 is larger than that of the closed space 27, the suction force of the seal surface on the side of the closed space 24 having a large volume becomes larger than the suction force of the other seal surface, and the gasket 21 Since 21 is attracted to the member (valve 2 in the illustrated example) with which the sealing surfaces on the ribs 22, ..., 23 side are in contact, by directing this sealing surface toward either the valve 2 or the base 3. When the valve 2 and the base 3 are separated, the surface on which the gasket 21 is adsorbed can be selected.

FIG. 4 shows a third embodiment of the present invention. This gasket 31 is provided with inner ribs 32, ... And 35 ,. The depth of the closing space 34 between the inner ribs 32, ... On the sealing surface and the outer rib 33 is made deeper than the closing space 37 between the inner ribs 35 ,. The volume of the closed space 34 is made larger than that of the closed space 37.

FIG. 5 shows a fourth embodiment of the present invention. This gasket 41 is provided with inner ribs 42, ... And 45 ,. .. and the outer rib 43 have a radius smaller than that of the other ribs 45 ,. It is made larger than the volume of the closed space 47. Since the operation of these embodiments is the same as that of the second embodiment, the description thereof will be omitted.

[0013]

[Effect of device]

 According to the present invention, since the gasket firmly adheres to the valve and the base by the closed space that is provided between the inner rib and the outer rib and is closed to the outside, these members are separated when they are separated. Since it is adsorbed on one side and does not separate, reassembly is easy. Also, by changing the volume of the closed space provided on both sealing surfaces, the gasket will be adsorbed to the member on the side where the closed space with a large volume is in contact, so select the member that the gasket will adsorb when separated. be able to.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment.

FIG. 2 is an enlarged cross-sectional view taken along the line EE of FIG.

FIG. 3 is an enlarged cross-sectional view of a main part of the second embodiment.

FIG. 4 is an enlarged cross-sectional view of a main part of the third embodiment.

FIG. 5 is an enlarged cross-sectional view of a main part of the fourth embodiment.

FIG. 6 is a plan view of a known gasket.

7 is an enlarged cross-sectional view of FIG.

[Explanation of symbols]

 2 valves 3 bases 11, 21, 31, 41 gaskets 12, 22, 32, 42 inner ribs 25, 35, 45 inner ribs 13, 23, 33, 43 outer ribs 26, 36, 46 outer ribs 14, 24, 34 , 44 Closed space 27, 37, 47 Closed space P, A, B Opening

Claims (2)

[Scope of utility model registration request] 1. A valve gasket having a plurality of openings for individually communicating a plurality of ports opened in the valve and the base, and sealing between the valve and the base, wherein the valve gasket On the sealing surface facing the valve and the base, inner ribs surrounding the openings are provided, outer ribs on the outer side, and a closed space closed between the ribs and the outside. The gasket for valves is characterized by: 2. The valve gasket according to claim 1, wherein the volume of the closed space of the one sealing surface is made larger than the volume of the closed space of the other sealing surface.