CN108956057A - DBB valve leak detecting device - Google Patents

Abstract

The invention discloses a kind of DBB valve leak detecting devices.The device includes DBB valve, pressure guiding pipe and intelligent pressure/differential transmitter, and DBB valve is connected with pipeline before a valve, and DBB valve has a valve chamber；One end of pressure guiding pipe is connected with pipeline before valve, and the other end is connected with valve chamber, and first shut-off valve and second shut-off valve are provided on pressure guiding pipe；Intelligent pressure/differential transmitter is connected with the first shut-off valve and the second shut-off valve；Wherein, on pressure guiding pipe, the first shut-off valve pipeline before valve, and the second shut-off valve is close to valve chamber.The setting and connection that DBB valve leak detecting device in the present invention passes through the equipment such as shut-off valve and intelligent differential pressure transmitter, it can monitor that there is a phenomenon where leak for DBB valve in time, realize the on-line checking of the airtightness to DBB valve, provide its technical conditions for being used for the work such as flow meter calibrating, it is ensured that DBB valve can be used smoothly.

Description

DBB valve leak detection device

technical field

The invention relates to the field of detection devices, in particular to a DBB valve leakage detection device.

Background technique

DBB (double block and bleed) valve, double block and double bleed valve, is a plug valve with double block and bleed function. There is a valve chamber in the middle of the DBB valve, a shut-off valve is provided at both ends of the valve chamber, and a cock is provided in the middle of the valve chamber, wherein the shut-off valve can withstand the pressure from the DBB valve. The pressure at both ends, while the cock can relieve the pressure in the valve cavity.

DBB valves are widely used in many fields of industrial production, such as the calibration of flowmeters used to measure crude oil and the like. In the use of DBB valves, in order to ensure the accuracy and safety of metering and other work, it is necessary to ensure that the DBB valves always maintain good airtight performance, so it needs to be tested to avoid leakage caused by insufficient airtightness. However, if the DBB valve is only tested before use, it is often difficult to ensure that it can maintain airtightness at any time during use, and will not leak under pressure. Therefore, only the design of the DBB in use On-line leakage detection of the valve ensures that the occurrence of leakage can be detected in time. In order to ensure the smooth progress of measurement and other work.

Contents of the invention

In order to solve the above problems, the present invention provides a DBB valve leakage detection device.

According to one aspect of the present invention, a DBB valve leakage detection device is provided, comprising

A DBB valve, the DBB valve is connected to a valve front pipeline, and the DBB valve has a valve cavity;

A pressure introduction pipe, one end of the pressure introduction pipe is connected to the pipeline in front of the valve, and the other end is connected to the valve cavity, and a first stop valve and a second stop valve are arranged on the pressure introduction pipe;

An intelligent differential pressure transmitter, the intelligent differential pressure transmitter is connected to both the first shut-off valve and the second shut-off valve;

Wherein, on the pressure introduction pipe, the first stop valve is close to the pipeline before the valve, while the second stop valve is close to the valve chamber.

The DBB valve leakage detection device in the present invention can monitor the leakage phenomenon of the DBB valve in time through the setting and connection of equipment such as the stop valve and the intelligent differential pressure transmitter, and realizes the online detection of the airtightness of the DBB valve, providing The technical conditions for its use in flowmeter calibration and other work are guaranteed to ensure that the DBB valve can be used smoothly.

In some embodiments, a cock is provided on the valve chamber, and a shut-off valve is provided at opposite ends of the valve chamber. Thus, the specific structure of the DBB valve is clarified, which can realize the double shut-off and release functions.

In some embodiments, the first shutoff valve is a V-127 type and the second shutoff valve is a V-128 type. Thus, the models of the first cut-off valve and the second cut-off valve can be set, and appropriate cut-off valves can be selected according to needs to achieve corresponding effects.

In some embodiments, a three-valve group is installed on the smart differential pressure transmitter, the first stop valve is connected to the negative end of the three-valve group, and the second stop valve is connected to the positive end of the three-valve group. Therefore, by using the three-valve group, both the first cut-off valve and the second cut-off valve can be connected to the intelligent differential pressure transmitter, and the connection method is set so that the intelligent differential pressure transmitter can detect the first cut-off The pressure difference between the valve and the second shut-off valve.

In some embodiments, the smart differential pressure transmitter is also connected to a differential pressure indicator. Thus, the differential pressure between the first shut-off valve and the second shut-off valve detected by the intelligent differential pressure transmitter can be displayed through the differential pressure indicator.

In some embodiments, a manual pressure relief device is also included, wherein the manual pressure relief device can release the pressure of the valve cavity. Thus, the pressure relief of the valve cavity and the detection of the differential pressure can be performed manually, so as to detect whether the DBB valve leaks, and judge the accuracy of the structure detected by the intelligent differential pressure transmitter.

Description of drawings

FIG. 1 is a circuit diagram of a DBB valve leakage detection device according to an embodiment of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 schematically shows a circuit of a DBB valve leakage detection device according to an embodiment of the present invention. As shown in Figure 1, this device acts on a DBB valve 1, and this DBB valve 1 has a valve chamber 11, and is provided with a cock 12 on the valve chamber 11, and wherein cock 12 is preferably wedge-shaped cock 12; Both opposite ends of the chamber 11 are provided with a shut-off valve 13, whereby the DBB valve 1 can realize double shut-off and discharge functions. In addition, the DBB valve 1 is connected to a pre-valve pipeline 10, and the pre-valve pipeline 10 is located in front of the DBB valve 1, that is, when the medium to be measured flows in the pipeline, it will first pass through the pre-valve pipeline 10, and then pass through the DBB valve 1.

A pressure introduction pipe 2 is also provided between the pre-valve pipeline 10 and the DBB valve 1 , one end of the pressure introduction pipe 2 is connected to the pre-valve pipeline 10 , and the other end is connected to the valve cavity 11 of the DBB valve 1 . And two cut-off valves are arranged on the pressure introduction pipe 2, respectively set as the first cut-off valve 3 and the second cut-off valve 4, wherein, the model of the first cut-off valve 3 is preferably V-127 type, and it is in the pressure introduction pipe 2 is closer to the pre-valve pipeline 10; and the model of the second shut-off valve 4 is preferably V-123 type, and its position on the pressure introduction pipe 2 is closer to the valve chamber 11.

The first cut-off valve 3 and the second cut-off valve 4 are also connected with an intelligent differential pressure transmitter 5, and a three-valve group is installed on the intelligent differential pressure transmitter 5, wherein the first cut-off valve 3 and The negative ends of the three valve groups are connected, and the second cut-off valve 4 is connected with the positive ends of the three valve groups. In addition, the intelligent differential pressure transmitter 5 is also connected with a differential pressure indicator 51 . The intelligent differential pressure transmitter 5 can receive the pressure transmitted from the first shut-off valve 3 and the second shut-off valve 4 respectively via the three-valve group, thereby detecting the differential pressure and displaying it by the differential pressure indicator 51 .

In addition, a manual pressure relief device can also be provided at an appropriate position, and the operation of the manual pressure relief device can relieve the pressure of the valve cavity 11 of the DBB valve 1, so as to further judge whether the DBB valve 1 leaks according to the pressure difference at this time.

When using this detection device, set the first cut-off valve 3 and the second cut-off valve 4 to fully open, while the pressure-receiving valve of the three-valve group is set to fully open, and the balance valve is set to close. At this time, if the DBB valve 1 is opened, the valve cavity 11 is consistent with the pressure of the pre-valve pipeline 10, and the pressure difference detected by the intelligent differential pressure transmitter 5 is approximately 0kPa.

When the DBB valve 1 is closed, its valve cavity 11 is a sealed cavity, and the cock 12 is sealed downward with the closing of the valve. The medium in the valve cavity 11 is squeezed but cannot be released. Therefore, the valve cavity 11 and The pressure difference between the pipelines 10 before the valve will gradually increase, and the pressure difference detected by the intelligent differential pressure transmitter 5 will also gradually increase, it can be judged that the sealing performance of the DBB valve 1 is good; and if the DBB valve 1 1 if leakage occurs, the medium in the valve chamber 11 will no longer be under pressure, so it will gradually return to before being squeezed, and will be released under the action of the pressure difference, while the pressure detected by the intelligent differential pressure transmitter 5 The difference will gradually decrease, even drop to zero, then it can be judged that the DBB valve 1 is leaking.

If in the process of using the detection device, it is considered that the judgment result may be incorrect, you can operate and open the manual pressure relief device to relieve the pressure on the valve cavity 11 of the DBB valve 1, and close the manual pressure relief device after the pressure relief is completed. Then observe the differential pressure shown by the differential pressure indicator 51. If the sealing performance of the DBB valve 1 is good, the differential pressure displayed should be maintained at a negative value, and if the differential pressure gradually increases or even approaches zero, then It can be judged that DBB valve 1 is leaking.

What have been described above are only some embodiments of the present invention. For those skilled in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims (6)

1.DBB valve leak detecting device, it is characterised in that: including

DBB valve (1), the DBB valve (1) are connected with pipeline (10) before a valve, and the DBB valve (1) has one A valve chamber (11)；

Pressure guiding pipe (2), wherein one end of the pressure guiding pipe (2) are connected with pipeline (10) before the valve, the other end and the valve Chamber (11) is connected, and first shut-off valve (3) and second shut-off valve (4) are provided on the pressure guiding pipe (2)；

Intelligent pressure/differential transmitter (5), the intelligent pressure/differential transmitter (5) and first shut-off valve (3) and second cut-off Valve (4) is connected；

Wherein, on the pressure guiding pipe (2), pipeline (10) before the close valve of first shut-off valve (3), and described second section Only valve (4) is close to the valve chamber (11).

2. DBB valve leak detecting device according to claim 1, it is characterised in that: the valve chamber (11) is equipped with one Cock (12), and a Shuttoff Valve (13) is equipped at the opposite both ends of the valve chamber (11).

3. DBB valve leak detecting device according to claim 1, it is characterised in that: first shut-off valve (3) is V- 127 types, and second shut-off valve (4) is V-128 type.

4. DBB valve leak detecting device according to claim 1, it is characterised in that: on the intelligent pressure/differential transmitter (5) Three valve groups are provided with, first shut-off valve (3) is connected with the negative terminal of three valve group, and second shut-off valve (4) it is connected with the anode of three valve group.

5. DBB valve leak detecting device according to claim 1, it is characterised in that: the intelligent pressure/differential transmitter (5) is also It is connected with a pressure difference indicator (51).

6. DBB valve leak detecting device according to claim 1, it is characterised in that: it further include a manual operation pressure relief device, Wherein, the manual operation pressure relief device can carry out pressure release to the valve chamber (11).