JP6228429B2 - Check valve fitting structure and packing integrated check valve - Google Patents

Description

  The present invention relates to a check valve fitting structure set on the primary side of a water meter, a packing integrated check valve used for the check valve, and an expansion tube unit.

  Conventionally, the packing-integrated check valve is set at the inner diameter portion of the connection joint on the secondary side of the water meter and has prevented the reverse flow from the secondary side from flowing back from the inside of the water meter to the primary side. Since there is no support structure to prevent the check valve body from flowing to the secondary side, if the check valve body support is lost due to damage to the column of the check valve body, the check valve body and parts will be There is a problem that it takes a great amount of labor and time to flow downstream, clogging the piping and disassembling the piping for removal.

  As long as the check valve is set to the inner diameter of the secondary side of the water meter, it is difficult to firmly support and fix the check valve on the secondary side. However, in general, an expansion stop cock is installed on the primary side of the water meter, and it is not possible to set a check valve on the inner diameter of the expansion pipe of the existing pipe connected to the primary side of the water meter. There are circumstances that are impossible.

  Corresponding to the above problem, the proposal of Patent Document 1 that attempts to reinforce a synthetic resin cage that fixes the valve shaft on the downstream side of the valve hole with a metal reinforcing material, a water stop valve on the primary side of the water meter A proposal as disclosed in Patent Document 2 in which a check valve is incorporated into a gasket, and a packing-integrated check valve having a flange portion is fitted in a through-hole of a secondary joint pipe, and a water stop end face of the primary joint pipe and 2 There is a proposal of Patent Document 3 in which a flange portion is sandwiched between the water stop end surfaces of the secondary joint pipe.

Further, regarding the setting of the check valve on the primary side, the invention of Patent Document 4 by the applicant, in which the valve case of the check valve unit in which the filtration rectifying plate is set via the valve seat is formed as an expansion tube, There is also a design of Patent Document 5 in which a check valve is housed in a socket.
JP 2010-276037 A JP 7-280114 A JP 2009-115147 A JP 2008-14352 A No. 1099272 Design Registration Gazette

  However, since the inventions of Patent Document 1 and Patent Document 3 are both on the secondary side, the check valve itself is set on the secondary side. Since the check valve according to the design of Patent Document 5 is open without a structure for fixing the rear end of the valve mechanism, the valve is opened when the flow pressure from the primary side to the secondary side becomes high. There is a risk that the mechanism jumps out of the socket and enters the meter.

In addition, the inventions of Patent Document 2 and Patent Document 4 require the removal of the upper part of the stop cock or the expansion / contraction tube unit at the time of replacement and maintenance of the check valve. There is a problem that is necessary. Furthermore, as can be seen from the illustrations of Patent Document 1 and Patent Document 3, the conventional packing-integrated check valve has a valve mechanism portion set on the rear secondary side of the flange body that is a fixing mechanism to the fitting space. Therefore, the check valve cartridge cage is not supported behind the flow pressure from the primary side to the secondary side and is easily damaged.

  The present invention is intended to address the above-described problem, and an expansion tube unit set on the primary side of the water meter so that it can be used for existing piping while maintaining the ease of replacement of the check valve and maintenance work. The secondary valve end is provided with a fitting space for the check valve cartridge, and in the fitting space, the secondary side end is sandwiched between the water meter primary side end surface and the secondary side end surface of the telescopic tube unit. Fits a check valve cartridge integrally formed with a packing having a flange body, and joins the secondary side end of the telescopic tube unit and the water meter primary side end to check the water meter primary side. The valve was fitted.

  By comprising in this way, the packing which has the flange body integrally joined by the rear end of the cartridge cage which accommodates a non-return valve mechanism part is attached to the secondary side end surface of the water meter primary side surface and the expansion tube unit. The rear end of the cartridge is structurally fixed by being sandwiched, and the valve mechanism unitized as a cartridge can be fitted into the telescopic tube unit so that it can be inserted into and removed from the fitting space integrally with the packing. It is.

The packing having the flange body is integrally fitted to the rear end of the cartridge cage to reinforce the supporting force against the fluid pressure from the primary side to the secondary side, and the flange body is made of a synthetic resin cartridge. The cartridge cage is formed by a metal housing snap-fitted to the rear end of the cage, and a rubber gasket is attached to the flange portion to enhance the robustness of the cartridge cage.

With the above configuration, the packing integrated check valve can be attached to the primary side of the water meter by replacing the telescopic tube unit even in the case of existing piping.

  In the present invention, the check valve cartridge is fixedly fitted integrally with the expansion / contraction tube unit as described above, and thus is structurally fixed to the stop cock of the primary side pipe and the end face of the water meter primary side. The check valve can be set to the primary side of the meter, the check valve can be replaced and the maintenance work becomes extremely easy, and the check valve and its parts can be prevented from flowing into the secondary pipe. There is.

1 shows an embodiment of the present invention, and shows a water stopcock, an expansion tube unit, and a check valve cartridge each showing a situation in which a check valve cartridge is fitted to an expansion tube unit joined to a water stop cock. Exploded side view with section cut away Similarly, the vertical cross-sectional side view of the expansion tube unit and the check valve cartridge showing a state in which the check valve cartridge is fitted in the fitting space of the expansion tube unit Similarly, a stop cock secondary side and a water meter with a cut-out cross section showing a state in which a check valve is set between the secondary side of the stop cock and the primary side of the water meter via an expansion tube unit. Partially enlarged longitudinal sectional side view of the primary side connecting part Similarly, an enlarged vertical cross-sectional side view showing an example of a check valve cartridge that is fitted in an expansion tube unit Similarly, an enlarged longitudinal sectional side view showing another embodiment of the check valve cartridge fitted in the expansion tube unit.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Reference numeral 1 denotes a main body of a check valve cartridge, which is a valve that is fitted with a valve seat 12 on the primary side and contacts and closes the valve seat 12. A cartridge cage 11 that supports and stores the body 13 by urging the body 13 to the primary side by a spring 14, a flange housing 15 that is fitted to the secondary side end of the cartridge cage 11, and a flange portion 15 a of the flange housing 15. And a flange body 16 constituted by a gasket 15b made of an elastic material such as rubber.

The flange housing 15 may be integrally formed with the cartridge cage 11 by using a synthetic resin. However, the flange housing 15 is fitted to the secondary side end of the cartridge cage 11 as a stronger metal or the like, or fixed by snap fitting or the like. The strength can be increased, and a more robust check valve cartridge 1 can be configured.

Reference numeral 2 denotes an expansion tube unit, an expansion tube 21 provided with fitting projections 22 and 23 at both ends, a cap nut 24 screwed into a secondary end male screw 31 of a stop cock 3 of a primary side pipe, It consists of a cap nut 25 screwed into the primary end 41 of the meter 4.

The fitting projection 22 is fitted to the inner diameter of the water passage 32 of the water stop cock 3 of the primary side pipe so as to be slidable while maintaining watertightness by the O-ring 22a and the packing 22b. Is engaged with the inner peripheral end of the cap nut 25 via the metal ring 23 a and joined to the primary end 41 of the water meter 4. A fitting space 26 that communicates with the water passage 27 and fits the check valve cartridge 1 is set at the secondary side end of the telescopic tube 21.

In the case of an existing pipe, the extension pipe 21 configured as described above is attached with a new extension pipe unit that can be accommodated by closing the water stop cock and removing the extension pipe unit. In the case of a new installation, the primary end is inserted into the inner diameter of the water passage 32 of the stop cock 3, and the cap nut 24 is screwed into the male screw 31 provided on the outer periphery of the secondary end of the stop cock 3. Then, the primary side of the telescopic tube 21 is screwed to the water stop cock 3.

Next, when the check valve cartridge 1 is inserted from the secondary side of the expansion / contraction tube 21 and is fitted in the fitting space 26, the flange body 16 of the check valve cartridge 1 is connected to the secondary peripheral end surface of the expansion / contraction tube 21 and the anchor. It touches the shape.

Further, if the cap nut 25 is screwed into the male screw 42 provided on the outer periphery of the primary side end 41 of the water meter 4 and the secondary side of the telescopic tube 21 is screwed to the primary side of the water meter 4. The flange body 16 is sandwiched between the secondary side peripheral end surface of the telescopic tube 21 and the primary side end surface of the water meter 4 to form a stable support structure and against the flow pressure from the primary side to the secondary side. The cage of the check valve cartridge can be strongly supported from the rear.

An O-ring 17 is set on the outer peripheral surface of the primary side end of the check valve cartridge 1 to stop water flowing on the outer periphery of the check valve cartridge at the time of backflow. Depending on the environment, an O-ring 17 is set on the primary side end face of the check valve cartridge 1 as shown in FIG.

After setting the check valve on the primary side of the water meter 4 as described above, the valve of the stop cock 3 is opened to finish the setting. 26, the check valve cartridge 1 is integrally fitted so that it can be inserted and removed. Therefore, the check valve cartridge 1 can be easily detached, and the check valve cartridge or check valve mechanism in the fitting space can be easily taken out for repair. Can be exchanged.

The check valve fitting structure, packing-integrated check valve, and telescopic tube unit according to the present invention strengthen the structure of the check valve cartridge cage, which is easily damaged. Since it was prevented from being lost and causing accidents such as water channel blockage, it has a high utility value in the water supply industry.

1 Check Valve Cartridge 11 Cartridge Cage 12 Check Valve Valve Seat 13 Check Valve Valve 14 Spring Energizing Valve 15 Check Valve Cartridge Flange Housing 15a Flange Housing Flange 15b Fitting to Flange Gasket 16 Cartridge flange body 17 O-ring 2 Stretchable tube unit 21 Stretchable tube 22 Stretchable tube primary side fitting projection 22a O-ring 22b Packing 23 Stretchable tube secondary side fitting projection 23a Metal ring 24 Stretchable tube 1 Secondary side cap nut 25 Secondary tube side cap nut 26 Cartridge fitting space 27 set in the telescopic tube Water passage 3 of the telescopic tube unit Stop cock 31 Secondary end male screw 32 of the stop cock Water faucet passage 4 Water meter 41 Primary side end 42 of water meter Male screw provided on the outer periphery of the primary side end of the water meter

Claims (2)

The Osamuhama space of the check valve cartridge is provided on the secondary side end of the telescopic tube unit is set to the primary side of the waterworks meter,
A non-return valve cartridge in which a flange body is formed on the housing joined to the rear end of the cartridge cage, and a gasket is attached to the flange portion of the flange body.
The flange of the check valve cartridge is sandwiched between the water meter primary side end surface and the secondary side end surface of the telescopic tube unit, and the check valve is attached to the water meter primary side. A check valve fitting structure, wherein the check valve is fitted . The secondary-side end portion of the check valve cartridge, a packing having a flange body which is clamped to the secondary-side end face of the telescopic tube unit with a water meter primary end surface with integrally formed, the synthetic resin of the same flange body A packing-integrated check valve which is formed by a metal housing fitted to the rear end of a cartridge cage made of rubber, and is configured by mounting a gasket made of rubber or other elastic material on the flange portion of the metal housing .

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