JP2829926B2 - Check valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve used for a flow path of water supply or the like. The replacement is easily realized.

[0002]

2. Description of the Related Art In a water supply system, for example, in a public water supply network, the operation of a main valve, a rupture of the main pipe, a large pressure fluctuation (extreme water supply to a part of the piping system due to an stoppage of an additional pump or emergency water intake from a fire hydrant, etc.). Tap water may flow back when pressure drops due to severe water demand.
Due to this backflow, once discharged tap water may be sucked into the water pipe. The check valve is provided in the flow path of tap water in order to prevent such a phenomenon.

A conventional check valve will be described below with reference to the drawings. FIG. 14 is a front sectional view of a conventional check valve, and FIG.
5 is a layout diagram of a water supply system provided with the present invention and a conventional check valve. As shown in FIG.
Is provided with a valve body 12, an arm suspension 16, and a lid 19 on the upper part of the valve body. Further, an upper part of the flow path 2 of the valve body 12 has an arm 4 which is suspended from a horizontal swing valve shaft 3 which is perpendicular to the flow path 2. A top 6 on which a sheet packing 5 is fitted is loosely fitted to the arm 4 such that the vertical inner surface of the flow path 2 and the sheet packing 5 can freely come and go. The portion that comes into contact with and separates from the sheet packing 5 is a sheet surface 15.
Is formed integrally with the valve body 12. The arm 4 is attached to the valve body 12 by fitting an arm suspension 16 in which the swing valve shaft 3 on the upper side is fitted into a concave portion 17 on the valve body 12. The upper part of the valve body 12 is sealed by a lid 19. Both ends of the flow path 2 of the valve body 12 are connected to a water pipe.

[0004] In the water supply system shown in FIG.
A meter M and a stopcock 8 are provided on the water main P side (primary side) from 1. That is, the water stopcock 8, the meter M, and the check valve 11 are arranged in the ground in order from the primary side. At the time of water flow, the top 6 loosely fitted to the arm 4 by the water pressure (water flow S) on the primary side from the check valve 11,
The upper part of the arm 4 is pushed up inside the valve body 12 around the swing valve shaft 3. Therefore, the valve body 12
The above-mentioned flow path 2 is in a water-passing state. Then, the tap water on the primary side is supplied from the check valve 11 to the faucet 9 side (secondary side).

In the water supply system, the secondary tap water flows into the check valve 11 by the suction force due to the above-mentioned backflow factor. The top 6 loosely fitted to the arm 4 is caused by the suction force to move the seat packing 5 of the top 6 and the flow path 2 of the valve body 12 around the swing valve shaft 3 above the arm 4. The vertical inner surface, ie, the seat surface 15
Is sucked until it comes into contact with. Therefore, the flow path 2 is blocked by the top 6, and the secondary tap water does not flow back to the primary side.

[0006]

The function of a check valve is deteriorated due to the adhesion of scale over time and the like. Therefore, it is necessary to replace the seat packing 5 and the seat surface 15 described above to prevent functional deterioration. Conventionally, since the seat surface 15 of the check valve is formed on the valve main body, the valve main body must be removed from the water supply pipe and replaced with the entire valve main body, which is extremely difficult.

[0007]

According to the present invention, in order to solve such a problem, the surfaces of the seats that contact each other are inclined at a predetermined angle with respect to the direction of insertion into the valve body.
It is characterized in that the cartridge is formed of a pair of cartridge pieces, and this cartridge is detachable from the valve body.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. The structure of the check valve of the present invention is shown in FIGS. FIG. 1 is a right side view of the check valve,
2 is a plan view of the check valve, FIG. 3 is a right side sectional view of the check valve, FIG. 4 is a front sectional view of the check valve, and FIGS. 5 to 7 are front views of the cartridge piece A, respectively. , Rear view, plan view, left side sectional view and right side view, FIGS. 8 to 10 are front view, rear view, plan view, right side sectional view of cartridge piece B, respectively, and FIG. FIG. 13 is a perspective view of a cartridge in which B is integrated.

The check valve 1 of the present invention comprises a valve body 10 having a flow path 2 at both ends to which a water pipe is connected, a cartridge mounted on the valve body 10 and comprising a pair of cartridge pieces A and B, It comprises an upper portion of the valve body 10 and a lid 19 for sealing a cartridge in the valve body 10 (see FIGS. 1 to 4). The cartridge has a swing valve shaft 3 centered on a horizontal axis orthogonal to the flow path 2.
An arm 4 suspended from the arm 4 and a top 6 fitted with a seat packing 5 and loosely fitted in a ring-shaped portion provided at a lower portion of the arm 4 are housed.

The cartridge piece A has a water flow hole 21 formed at the center, a concave portion 20 formed at an upper portion for fitting the swing valve shaft 3 of the arm 4, and the cartridge piece A fitted to the top 6. It has a sheet surface 15 that comes into contact with and separates from the sheet packing 5 (contacts when stopping water and separates when passing water) and is inclined at a predetermined angle with respect to a surface perpendicular to the flow path 2. Cartridge piece B
Has a water flow hole 22 formed in the center, and is joined to the cartridge piece A to form a cylindrical cartridge. This cartridge is inserted into the valve body 10,
The contact surface between the cartridge piece A and the cartridge piece B is inclined at a predetermined angle with respect to the insertion direction.

The cartridge piece A has a semi-cylindrical shape having a surface inclined at a predetermined angle to the vertical surface of the flow path 2 at an acute angle.
The surface that comes into contact with the sheet packing 5 fitted to the surface is the seat surface 15 (FIGS. 4 to 7). The cartridge piece B has a surface inclined at a predetermined angle to the vertical surface of the flow path 2 at an acute angle, and a cylindrical cartridge is formed by joining this inclined surface and the inclined surface of the cartridge piece A. (FIG. 11) It has a semi-cylindrical shape (FIGS. 8 to 10).
The arm 4 has a swing valve shaft 3 at an upper end centered on a horizontal axis orthogonal to the flow path 2 (see FIGS. 1 to 4), and a lower end has a ring shape for fitting a top 6. I have. The O-ring packing 23 is fitted to the lid 19 at the upper portion of the inner surface thereof at the contact portion with the upper portion of the valve body (FIG. 3 or FIG. 4).

When replacing the seat surface 15, the lid 19 is removed from the valve body 10, the cartridge piece B is taken out, and the cartridge piece A is taken out while the swing valve shaft 3 of the arm 4 is fitted in the recess 20. Then, the swing valve shaft 3 of the arm 4 is removed from the concave portion 20 above the cartridge piece A. Since the sheet surface 15 is formed integrally with the cartridge piece A, it can be easily replaced by this procedure. At this time, the cartridge piece B is taken out from the cartridge piece A.
This is easy because the contact surface between the cartridge piece B and the cartridge piece B is inclined at a predetermined angle. When replacing the seat packing 5, the lid 19 is removed from the valve main body 10, and the cartridge is detached from the swing valve shaft 3 fitted in the concave portion 20 above the cartridge piece A while being mounted on the valve main body. The arm 4 can be replaced by removing it.

When mounting, the cartridge piece A containing the arm is first inserted into the valve body 10, then the cartridge piece B is fitted along the inclined surface of the cartridge piece A, and the cover 19 is crimped. Installation is easy.
In the conventional check valve, the seat surface, which is a replacement part, is formed integrally with the valve main body, so it is difficult to replace the valve main body at the time of replacement, whereas in the check valve of the present invention, By making the seat surface forming portion a cartridge, replacement can be easily performed, and the labor for replacement and assembly can be significantly reduced.

Next, with reference to FIGS. 12, 13 and 15, the operation of the check valve according to the present invention will be described. FIG. 12 is a diagram showing a normal operation, FIG. 13 is a diagram showing an operation at the time of stopping water, and FIG. 15 is a layout diagram of a water supply system provided with the present invention and a conventional check valve. As described above, the meter M and the stopcock 8 are disposed on the water main P side (primary side) of the check valve 1.

At the time of water flow, the top 6 loosely fitted to the arm 4 by the water pressure (water flow S) of the tap water on the primary side from the check valve 1,
It is pushed up inside the valve body 10 around the swing valve shaft 3 above the arm 4. Therefore, the flow path 2 in the valve body 10
Is in a water flow state, and the tap water on the primary side is 2
Supplied to the next side. When the water stops, tap water on the secondary side enters the valve body 10 due to the suction force caused by the backflow. The top 6 loosely fitted to the arm 4 is suctioned by the suction force until the sheet packing 5 of the top 6 and the seat surface 15 of the cartridge piece A come into contact with each other around the swing valve shaft 3 at the upper part of the arm 4. . Accordingly, the flow path 2 is blocked by the top 6, and the tap water on the secondary side does not flow back to the primary side of the check valve 1.

[0016]

According to the present invention, the use of a cartridge having a sheet surface makes it possible to easily replace the sheet surface, which has been difficult in the prior art.

[Brief description of the drawings]

FIG. 1 is a right side view of a check valve of the present invention.

FIG. 2 is a plan view of the check valve of the present invention.

FIG. 3 is a right side sectional view of the check valve of the present invention.

FIG. 4 is a front sectional view of the check valve of the present invention.

FIG. 5 is a front view and a rear view of the cartridge piece A of the check valve of the present invention.

FIG. 6 is a plan view of a cartridge piece A of the check valve of the present invention.

FIG. 7 is a left side sectional view and a right side view of the cartridge piece A of the check valve of the present invention.

FIG. 8 is a front view and a rear view of the cartridge piece B of the check valve of the present invention.

FIG. 9 is a plan view of a cartridge piece B of the check valve of the present invention.

FIG. 10 is a right side sectional view of the cartridge piece B of the check valve of the present invention.

FIG. 11 is a perspective view in which a cartridge piece A and a cartridge piece B of the check valve of the present invention are joined.

FIG. 12 is a diagram showing a check valve during a water flow operation.

FIG. 13 is a diagram showing the check valve of the present invention during a water stopping operation.

FIG. 14 is a front sectional view of a conventional check valve.

FIG. 15 is a layout view in which the present invention and a conventional check valve are disposed in a water supply system.

[Explanation of symbols]

1, 11 ... check valve, 2 ... flow path, 3 ...
・ Swing valve shaft, 4 ・ ・ ・ Arm, 5 ・ ・ ・ Seat packing, 6 ・ ・ ・ Top, 8 ・ ・ ・ Stopcock, 9 ・ ・
・ Faucet, 10, 12 ・ ・ ・ Valve body, 15 ・ ・ ・ Seat surface, 16 ・ ・ ・ Arm suspension, 17 ・ ・ ・ Arm fitting recess, 19 ・ ・ ・ Cover, 20 ・ ・ ・ Recess, 21 ・
..Flow hole of cartridge piece A, 22 ... Flow hole of cartridge B piece, 23 ... O-ring packing, A.
..Cartridge pieces A and B ... Cartridge pieces B and S
... water flow.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 15/03 F16K 27/00-27/12

Claims (1)

(57) [Claims] A valve body having a flow path, a cartridge detachably mounted inside the valve body, and a lid mounted on an upper part of the valve body for sealing the cartridge; It consists of a pair of cartridge pieces whose surfaces that contact each other are inclined at a predetermined angle with respect to the direction of insertion into the valve body. The upper part of one of the cartridge pieces has a swing centered on a horizontal axis orthogonal to the flow path. An arm suspended from the valve operating shaft, a frame mounted on the arm, and a seat packing fitted on the frame, wherein the seat packing comes into contact with and separates from a seating surface of the one cartridge half slope. A non-return valve which is freely mounted and which fixes the cartridge by inserting the other cartridge piece and press-fitting the lid.