KR20050043635A - Stop cock having nonreturn function - Google Patents

Abstract

(Problem) Provide a water discharge valve having a backflow prevention function.

(Solution means) The valve seat 10 is provided on the secondary side of the valve port 6 which communicates the primary side flow passage 3 and the secondary side flow passage 5, and at the same time, the valve body (10) The valve body 11 is detachably attached to the valve body 11, and the valve body 11 is disposed between the valve body 11 and the valve body 11 as the spindle 7 moves forward and backward with respect to the spindle 7 capable of moving forward and backward in the axial direction of the valve mechanism 6. Install the spring 12 to stretch.

Description

STOP COCK HAVING NONRETURN FUNCTION}

The present invention relates to an index warfare having a backflow prevention function.

Conventionally, since the check valve is not provided before the water stop provided in the water supply pipe branching the drainage pipe, the water flows backward due to the negative pressure before the water stop or the pressure on the secondary side before the water stop being higher than the primary side. There was a risk of contamination of the drainage observations.

In order to prevent such a reverse flow, a check valve is provided in the flow path, but since a space for installing the check valve is required, the installation position is limited in order to achieve harmony with peripheral devices in the installation. There exists a problem of lack of versatility, etc., and the water field warfare integrally provided with the check valve is used widely (for example, refer patent document 1).

[Patent Document 1] Japanese Patent No. 3453424

However, the above-mentioned water stop is a simple combination of the check valve, and the two valve mechanisms of the water stop and the check valve must be incorporated, so that the structure is complicated and large, and the assembly and maintenance inspection are difficult. It has a problem such as becoming complicated.

In view of the above problems, the present invention provides a valve seat on a secondary side of a valve port that communicates a primary flow path and a secondary flow path, and detachably installs a valve on the valve seat. The said subject is solved by providing the exponential warfare with the check function which provided the spring which expands and contracts with a valve as the spindle advances and retreats between spindles which can move forward and backward in a direction.

The valve body may be made into a spherical shape in contact with a spring.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of embodiment of this invention is described based on drawing.

1 and 2 are longitudinal cross-sectional views of exponential power having a check function, Fig. 1 shows an exponential state, and Fig. 2 shows an exponential state during reverse flow.

In the valve box 1 before the still water, the center line of the flow path 3 of the inlet 2 communicating with the water supply source side and the flow path 5 of the outlet 4 communicating with the water discharge side are in a straight line. And an axis line extending to the secondary side of the valve port 6 which communicates the primary side flow passage 3 and the secondary side flow passage 5 and the secondary side flow passage 5 are formed in a so-called Y shape with an acute angle. .

The upper part of the valve box 1 is formed in substantially cylindrical shape along the axis line connected to the secondary side of the valve port 6, and forms the upper end opening, and this opening part is formed in the axial direction of the valve port 6 The cover process 9 with an O-ring 8 for hermetically inserting and supporting the freely moving spindle 7 is hermetically closed.

The valve port 6 is formed in the shape of a funnel which is axially reduced from the secondary side toward the primary side, and the valve seat 10 is provided on the enlarged secondary side of the valve port 6.

A spherical valve body 11 made of rubber is detachably attached to the valve seat 10, and the valve body 11 is arranged between the spindle 7 and the valve body 11 as the spindle 7 moves forward and backward. The spring 12 which expands and contracts with () is provided, and this spring 12 always presses the valve body 11 to a valve closing direction.

The spindle 7 is screwed on a female thread whose thread is processed on its proximal end side to a female thread whose thread is processed on an inner surface of a cylindrical portion 9a protruding from the upper surface center of the lid 9. 7) A single row of recessed grooves 7a are engraved and installed in the radial direction of the end surface of the base end, and the spindle 7 is rotated forward and reverse by inserting the tip of a jig such as a negative driver in the recessed groove 7a. Is freely moved forward and backward in the axial direction of the valve port 6.

In the spindle 7, the cover body 9 is inserted through, and a portion having no male thread is provided around the 0-ring groove, and the cover is covered with an O-ring 13 attached to the 0-ring groove. Watertight is formed between the sieve 9 and the spindle 7 inserted therethrough. In the middle portion of the spindle 7, a flange shape having a diameter larger than that of the spindle insertion hole of the lid body 9 is formed. The stopper 7b is protruded outward, and the stopper 7b is brought into contact with the inner end face 9b of the lid 9 in the retracted state of the spindle 7.

The spring 12 consists of a conical coil spring, and its small diameter end is fixed to the spring support 7c provided at the distal end of the spindle 7, and the large diameter end is always brought into contact with the valve body 11. have.

In addition, the spring 12 is not limited to a conical coil spring, but may be a cylindrical coil spring, and extends the proximal end of the spindle 7, and provides a handle for advancing and retracting the spindle 7 at the extended end thereof. Also good.

In addition, in the present Example, although the valve box 1 of the Y type | mold was disclosed, the type of the valve box 1 is not limited to Y type | mold, for example, may be an angle type, and also in the valve body 11, it is spherical shape. The shape of the valve opening 6, the valve seat 10, and the spring 12 may also be formed in a shape corresponding to the shape of the valve body 11.

Next, a description will be given of the operation of exponential power having a check function according to the present invention.

In the still water state shown in FIG. 1, by moving the spindle 7 in the valve closing direction and contracting the spring 12 to the maximum, the valve body 11 is firmly seated on the valve seat 10 so that the water still can be moved. Water.

In this exponential state, the spindle 7 is rotated to retreat, the spring 12 is elongated between the valve body 11 and the spindle 7, and the elastic force of the spring 12 (with respect to the valve body 11) is maintained. By weakening the valve closing force), the primary pressure acting in the valve opening direction of the valve body 11 overcomes the elastic force and secondary pressure of the spring 12 acting in the valve closing direction of the valve body 11. The spring 12 is shrunk so that the valve body 11 is separated from the valve seat 10 so that water flows through the valve port 6 from the primary side to the secondary side.

In the case of the water flow in which the valve body 11 opens the valve, when a reverse flow occurs, the secondary pressure to flow back becomes larger than the primary pressure, and the counter flow pressure always acts in the valve closing direction of the valve body 11. Immediately by the elastic force of the spring 12, the valve body 11 is seated on the valve seat 10 to prevent backflow to the primary side (see Fig. 2).

In short, the present invention provides a valve seat on the secondary side of the valve port for communicating the primary flow path and the secondary flow path, and at the same time, the valve seat is detachably attached to the valve seat, and the valve is capable of moving back and forth in the axial direction of the valve port. Since the spring is provided to expand and contract between the valves as the spindle moves in and out, the pressing force (elastic) in the valve closing direction with respect to the valve of the spring can be adjusted by moving the spindle forward and backward. When the maximum shrinkage is achieved, the valve body can be closed by closing the valve body, and the valve body can be made open in the valve opening state by passing the spring at the maximum contraction state, and water can be passed through.

And even if a backflow occurs in the water passage when the valve body opens the valve, not only the secondary pressure flowing back at this time but also the elastic force of the spring which is always pushed in the valve closing direction is added to this backflow pressure, so that the valve body is directly connected to the valve seat. By seating, backflow to the primary side can be prevented.

In this way, the elastic force of the spring is always pressurized in the valve closing direction of the valve element, so that even if the pressure on the primary side and the secondary side is not different at the time of reverse flow, before the primary side pressure and the secondary side pressure become the same pressure. The valve can be reliably and firmly closed by the spring, and the valve closing state can be maintained, so that a higher degree of backflow prevention can be realized.

Therefore, according to the present invention, since there is no need to incorporate two valve mechanisms, such as the water stopper and the check valve, as in the prior art, and the structure is simple due to the small number of parts as described above, the water stopper can be miniaturized and , Assembly and maintenance are extremely easy and inexpensive.

Since the valve body is made into a spherical shape in contact with the spring, the portion seated on the valve seat is different every time the operation is performed, and foreign matter can be prevented from entering between the valve body and the valve seat. Since there is no leakage, it can be made maintenance-free and water flowing through the valve body flows smoothly from the primary side to the secondary side along the spherical surface, so that the pressure loss can be reduced and the performance before the water can be improved. Its practical effect is very large.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing an exponential state of an exponential warfare with a check function.

Fig. 2 is a longitudinal sectional view of the exponent before showing the exponential state at the time of reverse flow.

* Explanation of the sign

3 Primary flow path 5 Secondary flow path

6 valve port 7 spindle

10 valve seat 11 valve body

12 springs

Claims (2)

The valve seat is provided on the secondary side of the valve port communicating the primary flow path and the secondary flow path, and the valve seat is detachably attached to the valve seat, and this valve body is provided between the spindle freely moving forward and backward in the axial direction of the valve port. , With a check function characterized in that the spring installed to expand and contract with the valve body as the spindle advances. The exponential warfare having a check function according to claim 1, wherein the valve body is formed into a spherical shape in contact with a spring.