JP2555608Y2 - Stopcock with check valve - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a stopcock with a check valve,
In particular, the present invention relates to measures for preventing abnormal pressure rise on the secondary side of the check valve and measures for reducing pressure loss.

[0002]

2. Description of the Related Art Conventionally, as a water stopcock with a check valve, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 2-46170, a check valve unit is provided in a union of a ball type water stopcock provided with a telescopic union. Is slidably built in, a coil spring is provided on the primary side of the check valve unit, and this coil spring is supported by a spring receiver fixed to the union. An insertable recess is provided on the main unit side, and when abnormal pressure rise occurs on the secondary side, the check valve unit itself moves to the primary side against the urging force of the coil spring, increasing the volume on the secondary side By doing so, there is known a device in which a rise in pressure on the secondary side is absorbed and reduced.

[0003]

In general, there is a demand for reducing the pressure loss of a stopcock with a check valve as much as possible. Water stoppers with check valves that demonstrate the above are also required. Furthermore, compactness,
Further improvements in durability and the like are desired.

The present invention has been made in view of such a point. The purpose of the present invention is to assume a fixed union type water stopcock in which a step is hardly formed in a flow path, and a check valve is provided. To provide a check valve with a check valve having the least pressure loss among check valves with a check valve that can exert a function of preventing abnormal pressure rise on the secondary side by appropriately incorporating a valve unit and a coil spring. It is in.

[0005]

In order to achieve the above object, the construction of the present invention comprises a water stopcock body 1 having a ball valve 2.
The check valve unit 5 is slidably fitted in the union 3 fastened to the large-diameter sleeve 1b of the two-stage sleeve 4 while the check valve unit 5 is slidably inserted into the union. A ring member 9 is arranged on the upstream side of the valve unit 5, and a coil spring 10 is mounted between the ring member 9 and the small-diameter sleeve 1a such that the outer periphery thereof is close to the inner peripheral surface of the small-diameter sleeve 1a. The inner diameter of the ring member 9 and the inner diameter of the coil spring 10 are set to be substantially the same as the inner diameter 1c of the water stopcock main body 1.

[0006]

According to the above construction, when an abnormal pressure rise occurs on the secondary side, the check valve unit moves to the primary side against the urging force of the coil spring, thereby increasing the volume on the secondary side. The pressure increase on the secondary side is absorbed and reduced.

[0007] Further, since there is no need for a spring receiver such as the above-mentioned conventional stopcock with a check valve, there is no need to provide a concave portion in the main body, so that there is no step between the main body and the coil spring. Since the inner diameter of the main body, the ring member and the coil spring are substantially the same, and the laminar flow is maintained between the strands of the coil spring to form a substantially closed flow path, the flow path becomes smooth. , Low pressure loss. Further, since the outer periphery of the coil spring is close to the inner peripheral surface of the small-diameter sleeve, water does not enter between the two, and the pressure loss can be further reduced by this configuration.

Further, since there is no spring receiver, the total length of the water stopcock is shortened accordingly. In addition, in the above-mentioned conventional stopcock with a check valve, the expansion and contraction union expands and contracts due to the fluctuation of the internal pressure, thereby applying extra stress to the connection pipe. No stress is applied. Moreover, in the conventional stopcock with a check valve described above, the check valve unit is built in the telescopic union separate from the main body, so that it easily vibrates together with the connection pipe, but in the present invention, the union is fastened to the main body. It is difficult to vibrate.

[0009]

Embodiments of the present invention will be described below. In FIG. 1, reference numeral 1 denotes a water stopcock main body provided with a ball valve 2, and a secondary side thereof has a two-stage sleeve 4 in which a small-diameter sleeve 1a and a large-diameter sleeve 1b are formed in two stages. . Reference numeral 3 denotes a union fastened to the large-diameter sleeve 1b, and reference numeral 5 denotes a check valve unit slidably fitted into the union 3, wherein the check valve unit 5 includes a housing 6 and a guide cylinder 5a. And a valve element 5b inserted therein and an internal spring 5c inserted in these two members.
Reference numeral 8 denotes a valve seat ring which is closed by contacting the valve element 5c.
Is a ring member arranged on the primary side of the valve seat ring 8, and a coil spring 10 is provided between the ring member 9 and the small-diameter sleeve 1a so as to be close to the inner peripheral surface of the small-diameter sleeve 1a. The check valve unit 5 is attached and is pressed to the secondary side together with the valve seat ring 8 and the ring member 9 by the urging force of the coil spring 10.
The inner diameter of the ring member 9 and the inner diameter of the coil spring 10 are set to be substantially the same as the inner diameter 1c of the main body 1.
This configuration is also one of the important features of the present invention.

In FIG. 1, for convenience of description, the open / closed state of the valve element 5b is shown above and below the dashed line when showing the internal structure of the check valve unit 5. Also, the housing 6
Is divided into a plurality of sections 6 by a partition 6a, for example.
The flow path is secured through the section 6b when the valve element 5b is open.

FIG. 2 shows an operation mode in a case where an abnormal pressure rise occurs on the secondary side in the configuration of the above embodiment. That is, when an abnormal pressure rise occurs on the secondary side due to a water hammer or the like, the check valve unit 5 works together with the valve seat ring 8 and the ring member 9 against the urging force of the coil spring 10,
The coil spring 10 is compressed and moves to the primary side. For this reason, the volume on the secondary side increases, and the pressure increase generated on the secondary side is absorbed and reduced.

Further, according to the above configuration, a spring receiver such as a conventional water stopcock with a check valve is not required, so that it is not necessary to provide a concave portion in the main body 1. There is no step between them, and the inner diameters of the main body 1, the ring member 9 and the coil spring 10 are set to be substantially the same, and the coil spring 10 maintains a laminar flow even between the strands and is substantially closed. Since the flow path is formed, the flow path becomes smooth and the pressure loss is small. Further, in the present invention, since the coil spring 10 is mounted so that the outer periphery thereof is close to the inner peripheral surface of the small-diameter sleeve 1b, no gap is formed between the two springs 10 and 1b, thereby further reducing pressure loss. It is done.

Further, since there is no spring receiver, the total length of the water stopcock is shortened accordingly. The union 3 is the main body 1
No extra stress is applied to the connection pipe because it does not expand and contract unlike the conventional water stopcock with check valve. Moreover, since the union 3 incorporating the check valve unit 5 receiving the secondary pressure is fastened to the main body 1, there is no movable part that vibrates together with the connection pipe, and this is particularly effective when the connection pipe is a flexible hose. It is a target.

[0014]

As described above, the water stopcock with a check valve of the present invention has a two-stage sleeve formed on the secondary side of the water stopcock body provided with the ball valve. The check valve unit is slidably fitted into the union fastened to the large-diameter sleeve, while a ring member is disposed upstream of the check valve unit, and a coil is provided between the ring member and the small-diameter sleeve. Since the spring was mounted so that its outer periphery was close to the peripheral surface of the small-diameter sleeve, and the inner diameters of the ring member and the coil spring were set to be substantially the same as the inner diameter of the water stopcock body, abnormalities occurred on the secondary side. When pressure increase occurs, it can absorb and mitigate the pressure rise, smooth the flow path and reduce pressure loss, and can supply fluid smoothly to the secondary side even at low fluid pressure. Total length of faucet Short can not take extra stress further connecting pipe, yet there is no pipeline vibration no moving parts to the connection pipe.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a normal state in an embodiment.

FIG. 2 is a longitudinal sectional view showing a state when an abnormal pressure rise occurs on the secondary side in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Ball valve 3 Union 4 Two-stage sleeve 5 Check valve unit 6 Housing 8 Valve seat ring 9 Ring member 10 Coil spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A two-stage sleeve 4 is formed on the secondary side of a water stopcock body 1 provided with a ball valve 2, and a non-return valve is provided in a union 3 fastened to a large-diameter sleeve 1b of the two-stage sleeve 4. While the valve unit 5 is slidably fitted therein, a ring member 9 is disposed upstream of the check valve unit 5, and a coil spring 10 is provided between the ring member 9 and the small-diameter sleeve 1a. A check valve, which is mounted so as to be close to the peripheral surface of the small-diameter sleeve 1a, and wherein the inner diameters of the ring member 9 and the coil spring 10 are set substantially equal to the inner diameter 1c of the water stopcock body 1. Stopcock.