JPH039558Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a check valve that is used by being attached to equipment or piping, such as a mixing faucet for hot and cold water in a water supply system.

(Prior Art) A conventional check valve that is attached to an appliance or pipe, such as a mixing faucet for hot and cold water in a water supply system, is disclosed in, for example, Japanese Utility Model Application Publication No. 126669/1983.
In this check valve, a valve seat is formed on the secondary end face of a cylindrical check valve body, and a cylindrical guide having a closed secondary end and a through hole in the peripheral wall is connected to the cylindrical check valve body. A valve body slidably inserted into the stop valve body and joined to the valve seat of the check valve body is attached to the closed end of the guide with a bolt nut.
The guide is urged toward the primary side by a spring, and a mounting screw is formed on the outer periphery of the main body.

In the above configuration, when the pressure of a fluid such as water acts on the primary side, the guide compresses the spring and moves to the secondary side, separating the valve body from the valve seat. Therefore, the fluid on the primary side flows from the through hole to the secondary side through between the valve seat and the valve body. Then, when the pressure of the fluid acting on the primary side disappears, the spring presses the valve body against the valve seat of the check valve main body via the guide, thereby blocking passage of fluid.

Therefore, when the primary side becomes negative pressure, the valve body remains pressed against the valve seat by the force of the spring,
Prevents backflow of fluid.

(Problems to be Solved by the Invention) In the conventional check valve described above, the valve seat is provided on the end face of the secondary side of the check valve main body, and the secondary side of the valve body is open. Therefore, the bolts and nuts that attach the valve body to the guide may not be tightened enough, or
Or, if the bolts and nuts are loosened, the pressure of the valve body against the valve seat by the spring decreases, so if fluid pressure acts on the secondary side, fluid may flow backward from the secondary side to the primary side. There's a problem. Further, when attaching the main body to the pipe, a screw provided on the outer circumferential surface of the main body is engaged with a thread of the pipe, so there is a problem that the installation process requires a lot of effort.

The present invention was made in order to solve the above-mentioned problems, and aims to provide a check valve that is free from the risk of fluid backflow and is easy to install.

(Means for Solving the Problems) The check valve of the present invention is provided with a rib on the inner periphery of the primary end of a cylindrical body, the inner surface of which serves as a valve seat, and the secondary end of the main body is provided with a rib. A valve body in contact with the valve seat is attached to a valve stem that is slidably inserted into a support hole of a support plate attached to the body, and a spring is provided in the main body to bias this valve body toward the valve seat. A locking wall for attachment is protruded from the outer periphery, a packing is attached to the outer surface of the locking wall, and the secondary side of the locking wall is locked to the edge of the end of the secondary side pipe via the packing. In this state, the main body is inserted into this pipe part, and with one end of the primary pipe part joined to the primary side of the locking wall via the packing, the end part of the pipe part is detachably attached. It is characterized in that it is connected to the end of the secondary side pipe portion with a fixture.

(Function) When the pressure of a fluid such as water acts on the primary side of the check valve of the present invention, the spring is compressed by the pressure, the valve body moves, and the valve seat is opened. flows from the side to the secondary side. When the pressure on the primary side is removed, the spring presses the valve body against the valve seat, preventing backflow of fluid. Since the valve body is placed between the valve seat and the spring, even if there is a change in the way the valve body is attached to the valve stem, the pressure of the valve body against the valve seat will not change. It is possible to always reliably prevent backflow of fluids such as

To attach the main body to an instrument or piping, the main body is inserted into the pipe-shaped attachment part of the instrument or the end of the piping, and a locking wall is locked to the attachment part or the end face of the piping via a packing. Then, the connecting pipe or piping is connected to the other side of the locking wall via the seal, and these are fixed with removable fixtures such as nuts, making it possible to easily and firmly install the main body. .

(Embodiment) An embodiment of the check valve of the present invention will be described with reference to FIG.

In the figure, reference numeral 1 denotes a cylindrical main body, and the inner surface of a rib 2 provided in the primary end of the main body serves as a valve seat 3. Reference numeral 4 denotes a support plate attached to the end of the secondary side of the main body 1, which has a liquid passage hole 5 formed on its outer periphery and a support hole 6 provided in the center. A support tube 7 is provided upright around the periphery of the support hole 6.

Attaching the support plate 4 to the main body 1
The support plate 4 is fitted into a stepped portion 8 provided on the inner periphery of the main body 1, and a thin bent portion 9 provided at the end of the main body 1 is bent inward.

Reference numeral 10 denotes a valve rod slidably inserted into the support hole 6 from the support tube 7, and a washer 11 and a valve body 12 made of rubber or the like are stacked on the end facing the valve seat 3, and the valve body 12 and the washer Machine screw 1 passing through 11
3 into the screw hole 14 of the valve stem 10, and then
A valve body 12 is attached to the valve 0. 15
is a coiled spring interposed between the support plate 4 and the washer 11, which urges the valve body 12 toward the valve seat 3.

Reference numeral 16 denotes a locking wall protruding from the outer periphery of the primary end of the main body 1, and a ring-shaped packing 17 having a U-shaped cross section is attached to the outer periphery of the locking wall.

The check valve configured in this way is, for example, a second check valve.
As shown in the figure, it is used by being attached to a mixing faucet 20 of hot and cold water. In this figure, 21 is the mixing faucet 2
The main body 1 is inserted into the pipe-shaped supply portion provided at the supply portion 21, and the locking wall 16 is locked to the edge of the end portion of the supply portion 21 via a packing 17. 22 is a connecting pipe, one end of which is connected to packing 1.
By connecting to the supply section 21 with a nut 24 that is connected to the locking wall 16 via the locking wall 16 and locking to the protruding wall 23 provided on the outer periphery of the end thereof, the main body 1 can be inserted through the locking wall 16. It is fixed inside the supply section 21. 26
is a faucet.

Note that the other supply section 2 in this mixing faucet 20
A check valve is also installed inside 5, but
Since this is the same as the supply section 21, description and illustration thereof will be omitted.

In the above configuration, when water pressure acts on the connecting pipe 22 in FIG. 2, the pressure acts on the primary side of the valve body 12 in FIG. 1, so the valve body 12 compresses the spring 15 and the valve stem 10 and opens the valve seat 3, water flows from between the valve seat 3 and the valve body 12 to the liquid passage hole 5.

Then, when the pressure on the valve body 12 is removed, the spring 15 presses the valve body 12 against the valve seat 3.
From the secondary side to the primary side, that is, in Fig. 2,
To prevent water from flowing back from the mixing faucet 20 side to the connecting pipe 22 side.

In FIG. 1, the support tube 7 can protrude outward from the support plate 4, and when the support plate 4 is thick, the support tube 7 can be omitted and only the support hole 6 is left. The support plate 4 can be attached to the main body 1 by any means such as screws or welding. Further, although the locking wall 16 is provided on the outer periphery of the primary end of the main body 1, its position may be arbitrary, such as at the intermediate portion or the secondary end.

As shown in FIG. 1, the gasket 17 can be easily attached to the locking wall 16 by making its longitudinal section U-shaped and inserting the locking wall 16 inside. In addition, since it is difficult to separate, it is suitable for preventing loss of the gasket 17 and for attaching a check valve to equipment such as a mixing faucet or piping. sell.

(Effect of the invention) As mentioned above, in the check valve of the present invention, the valve body is placed between the valve seat and the spring, so it is possible to always press the valve body against the valve seat in the same state. , can reliably prevent backflow of water, etc.

In particular, the present invention provides a locking wall protruding from the outer periphery of the main body, and arranges a packing on the outer surface of the main body, and connects the main body to both pipe parts at the joint of the primary and secondary pipe parts. By inserting and attaching the ends of the pipe into the secondary pipe part with both ends against the packing, and connecting the ends of both pipe parts with a removable individual fixture, The length of piping for mounting the check valve can be significantly shorter than that of conventional ones, and when assembled together, water leakage between the ends of both pipes can be prevented without the need for a separate seal structure. Since Patsukin takes care of all the work for you, it is possible to make equipment such as hot and cold water mixing faucets more compact, and the check valves are easy to attach and detach, making it easy to assemble, install, and maintain. It is also very advantageous in terms of work.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the check valve of the present invention, and FIG. 2 is a partially sectional plan view showing a mixing faucet for hot water and water equipped with the check valve of the present invention. 1...Main body, 2...Rib, 3...Valve seat, 4...
Support plate, 5...Support hole, 10...Valve stem, 12...
Valve body, 15... Spring, 16... Locking wall, 17...
Patsukin.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical body with a valve seat on the inner surface of a rib provided on the inner periphery of the primary end, and a liquid passage hole attached to the secondary end of this body. a valve stem slidably inserted into a support hole of a support plate provided with a valve stem, a valve element attached to the valve stem and in contact with the valve seat, and the main body biasing the valve element toward the valve seat. It has a spring provided inside, a locking wall protruding from the outer peripheral surface of the main body, and a gasket attached to the outer surface,
With the secondary side of the locking wall locked to the edge of the end of the secondary side pipe via the packing, the main body is inserted into this pipe, and the main body is inserted into the pipe on the primary side. The tube end is connected to the secondary tube end with a removable fixture with one end being joined to the primary side of the locking wall via the packing. non-return valve. (2) The check valve according to claim 1, wherein the seal has a U-shaped vertical cross-section, a locking wall is inserted inside the locking wall, and the seal is attached to the locking wall.