Instrument valve for pressure transmitter

Abstract

The utility model relates to the technical field of instrument valves, and discloses an instrument valve for a pressure transmitter, which comprises a valve body and a valve rod, a pressure guide channel is arranged in the valve rod, two ends of the valve rod are respectively provided with an installation joint and a valve core, two ends of the pressure guide channel are respectively arranged on the installation joint and the valve core, and a test cap is detachably arranged on the installation joint. The valve element is arranged in an inner cavity of the valve body, and a detection channel matched with the valve element is arranged at the bottom of the cavity of the valve body. According to the utility model, not only can the pressure transmitter be calibrated conveniently, but also the temporary pressure transmitter can be installed without shutdown to monitor the on-site medium state when the pressure transmitter fails, so that the calibration efficiency and the use effect of the pressure transmitter are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of instrument valves, in particular to an instrument valve for a pressure transmitter. Background Art

[0002] A pressure transmitter is a device that converts pressure into pneumatic or electrical signals for control and remote transmission. It converts physical pressure parameters such as gas and liquid sensed by the pressure measuring element sensor into a standard electrical signal to be fed to secondary instruments such as indicator alarms, recorders, and regulators for measurement, indication, and process regulation. When measuring the pressure of a measured medium, a pressure transmitter typically introduces the measured medium directly into the pressure transmitter for measurement.

[0003] There are at least the following problems in the existing technology: First, when the pressure transmitter needs to be calibrated, it is necessary to first remove the pressure transmitter from the pressure pipeline and then install it on the standard pressure calibrator. After the calibration is completed, it is removed and reinstalled on the pressure pipeline. The whole calibration process is relatively troublesome; second, when the pressure transmitter fails, it is necessary to close the pressure pipeline or replace the pressure transmitter under pressure. The operation is complicated, and most of the operations can only be performed in the shutdown state. Utility Model Content

[0004] In response to the deficiencies in the prior art, the utility model develops an instrument valve for a pressure transmitter. The utility model can not only facilitate the calibration of the pressure transmitter, but also facilitate the installation of a temporary pressure transmitter to monitor the status of the on-site medium without stopping the machine when the pressure transmitter fails, thereby effectively improving the calibration efficiency and use effect of the pressure transmitter.

[0005] The technical solution to the technical problem solved by the utility model is: an instrument valve for a pressure transmitter, comprising a valve body and a valve stem, a pressure-introducing channel being provided in the valve stem, a mounting joint and a valve core being provided at both ends of the valve stem, the two ends of the pressure-introducing channel being respectively arranged on the mounting joint and the valve core, a test cap being detachably provided on the mounting joint, the valve core being arranged in the inner cavity of the valve body, and a detection channel cooperating with the valve core being provided at the bottom of the cavity of the valve body.

[0006] As an optimization, the pressure channel is set inside the valve stem from top to bottom, and the bottom end of the pressure channel opens toward the detection channel. The left end of the valve body is connected to the measuring pipeline, and the right end is connected to the pressure transmitter. When the valve stem is turned down, the sealing head docks with the top of the detection channel, the pressure channel is disconnected from the measuring pipeline, and the instrument valve is closed. At this time, the test cap can be removed, and a standard pressure calibrator can be installed on the installation joint. The pressure transmitter can be calibrated by supplying gas of a certain pressure through the standard pressure calibrator. Alternatively, when the pressure transmitter fails, a temporary pressure transmitter can be installed on the installation joint. After the valve stem is turned up, the pressure channel is connected to the measuring pipeline. The temporary pressure transmitter can replace the failed pressure transmitter to monitor the medium pressure.

[0007] As an optimization, the bottom end of the pressure channel opens toward the inner cavity side wall of the valve body. The right end of the valve body is connected to the measuring pipeline, and the left end is connected to the pressure transmitter. When the valve stem is turned down, the sealing head docks with the top of the detection channel, the pressure channel is disconnected from the measuring pipeline, and the instrument valve is closed. At this time, the test cap can be removed, and a standard pressure calibrator can be installed on the mounting joint. The pressure transmitter can be calibrated by supplying gas of a certain pressure through the standard pressure calibrator. Alternatively, when the pressure transmitter fails, a temporary pressure transmitter can be installed on the mounting joint. After the valve stem is turned up, the pressure channel is connected to the measuring pipeline. The temporary pressure transmitter can replace the failed pressure transmitter to monitor the medium pressure.

[0008] As an optimization, a truncated cone-shaped sealing head is provided at the bottom of the valve core, and the top of the detection channel cooperates with the sealing head. The provision of the sealing head can improve the sealing effect between the valve core and the detection channel, preventing the medium from leaking from the sealing surface.

[0009] As an optimization, a sealing ring is installed on the inner side of the top of the valve body, and a locking sleeve is installed on the outer side of the top of the valve body, which is equipped with a locking nut. The sealing ring improves the sealing between the valve body and the valve stem, preventing medium leakage; the locking sleeve further improves the sealing between the valve body and the valve stem, preventing medium leakage; and the locking nut secures the locking sleeve.

[0010] As an optimization, a detachable handle is provided on the valve stem, which makes it easier for workers to turn the valve stem.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] By setting up a pressure-introducing channel, firstly, the pressure of the medium being measured can be directed to a temporary pressure transmitter when the pressure transmitter fails, and secondly, the pressure transmitter can be calibrated using a standard pressure calibrator during calibration; by setting up a mounting joint, a standard pressure calibrator or a temporary pressure transmitter can be installed without disassembling the pressure transmitter; by setting up a valve core and a detection channel, the medium channel between the pressure transmitter and the measuring pipeline can be connected or cut off; by setting up a test cap, the pressure-introducing channel at the mounting joint can be blocked during normal use to avoid leakage. The utility model can not only facilitate the calibration of the pressure transmitter, but also facilitate the installation of a temporary pressure transmitter to monitor the on-site medium status without stopping the machine when the pressure transmitter fails, effectively improving the calibration efficiency and use effect of the pressure transmitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a cross-sectional view of the first embodiment of the present invention.

[0014] Figure 2 This is a cross-sectional view of the second embodiment of the present invention.

[0015] In the figure: 1. Valve body; 2. Valve stem; 3. Pressure guide channel; 4. Mounting joint; 5. Valve core; 6. Test cap; 7. Detection channel; 8. Sealing ring; 9. Locking sleeve; 10. Locking nut; 11. Handle. DETAILED DESCRIPTION

[0016] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0017] Example 1

[0018] Figure 1 An embodiment of the present invention is as follows: Figure 1 As shown, an instrument valve for a pressure transmitter includes a valve body 1 and a valve stem 2. A pressure-introducing channel 3 is provided in the valve stem 2. A mounting joint 4 and a valve core 5 are respectively provided at both ends of the valve stem 2. The valve stem 2, the mounting joint 4 and the valve core 5 are integrally formed. The diameter of the valve core 5 is less than or equal to the diameter of the valve stem 2. The two ends of the pressure-introducing channel 3 are respectively provided on the mounting joint 4 and the valve core 5. A test cap 6 is detachably provided on the mounting joint 4 through a thread. The valve core 5 is provided in the inner cavity of the valve body 1. The inner cavity of the valve body 1 is communicated with the medium channel at one end of the valve body 1. A detection channel 7 cooperating with the valve core 5 is provided at the bottom of the cavity of the valve body 1. The detection channel 7 is communicated with the medium channel at the other end of the valve body 1.

[0019] By setting up the pressure-introducing channel 3, firstly, when the pressure transmitter fails, the pressure of the measured medium can be led to the temporary pressure transmitter; secondly, during calibration, the standard pressure calibrator can be connected to the pressure transmitter for calibration; by setting up the installation joint 4, a standard pressure calibrator or a temporary pressure transmitter can be installed without disassembling the pressure transmitter; by setting up the valve core 5 and the detection channel 7, the medium channel between the pressure transmitter and the measuring pipeline can be connected or cut off; by setting up the test cap 6, the pressure-introducing channel 3 at the installation joint 4 can be blocked during normal use to avoid leakage.

[0020] The pressure-inducing channel 3 is arranged to pass through the valve stem 2 from top to bottom, and the bottom end opening of the pressure-inducing channel 3 faces the detection channel 7. In Example 1, the left end of the valve body 1 is connected to the measuring pipeline, and the right end is connected to the pressure transmitter. When the valve stem 2 is screwed down, the sealing head is docked with the top of the detection channel 7, the pressure-inducing channel 3 is disconnected from the measuring pipeline, and the instrument valve is closed. At this time, the test cap 6 can be removed, and a standard pressure calibrator can be installed on the mounting joint 4. The pressure transmitter is supplied with gas of a certain pressure through the standard pressure calibrator to calibrate the pressure transmitter; or when the pressure transmitter fails, the valve stem 2 is screwed down, and a temporary pressure transmitter is installed on the mounting joint 4. After the valve stem 2 is screwed up, the pressure-inducing channel 3 is connected to the measuring pipeline, and the temporary pressure transmitter can replace the failed pressure transmitter to monitor the medium pressure.

[0021] The bottom of the valve core 5 is provided with a sealing head, which is truncated and matched with the top of the detection channel 7. By providing the sealing head, the sealing effect between the valve core 5 and the detection channel 7 can be improved to prevent the medium from leaking from the sealing surface.

[0022] A sealing ring 8 is provided on the inner side of the top of the valve body 1, and a locking sleeve 9 is provided on the outer side of the top of the valve body 1. A locking nut 10 is provided on the locking sleeve 9. The sealing ring 8 improves the sealing between the valve body 1 and the valve stem 2 and prevents leakage of the medium; the locking sleeve 9 further improves the sealing between the valve body 1 and the valve stem 2 and prevents leakage of the medium; and the locking nut 10 secures the locking sleeve 9.

[0023] The valve stem 2 is detachably provided with a handle 11. By providing the handle 11, it is convenient for the staff to rotate the valve stem 2.

[0024] Example 2

[0025] Figure 2 This is another embodiment of the present utility model, which differs from the first embodiment in that the pressure-inducing channel 3 is in a "T" or "L" shape, and the bottom end opening of the pressure-inducing channel 3 faces the inner cavity side wall of the valve body 1. In embodiment 2, the right end of the valve body 1 is connected to the measuring pipeline, and the left end is connected to the pressure transmitter. When the valve stem 2 is screwed down, the sealing head docks with the top of the detection channel 7, the pressure-inducing channel 3 is disconnected from the measuring pipeline, and the instrument valve is closed. At this time, the test cap 6 can be removed, and a standard pressure calibrator can be installed on the mounting joint 4. The standard pressure calibrator can be used to supply gas of a certain pressure to the pressure transmitter to calibrate the pressure transmitter. Alternatively, when the pressure transmitter fails, the valve stem 2 can be screwed down, and a temporary pressure transmitter can be installed on the mounting joint 4. After the valve stem 2 is screwed up, the pressure-inducing channel 3 is connected to the measuring pipeline, and the temporary pressure transmitter can replace the failed pressure transmitter to monitor the medium pressure.

[0026] When it is necessary to calibrate the pressure transmitter, the valve stem 2 is turned down by the handle 11, the sealing head is docked with the top of the detection channel 7, the pressure channel 3 is disconnected from the measuring pipeline, and the instrument valve is also closed. At this time, the test cap 6 can be removed, and a standard pressure calibrator can be installed on the mounting joint 4. The standard pressure calibrator is connected with the pressure transmitter through the pressure channel 3, and the pressure transmitter can be directly calibrated; when the pressure transmitter fails, the staff can turn down the valve stem 2 by the handle 11, so that the sealing head is docked with the top of the detection channel 7, the pressure channel 3 is disconnected from the measuring pipeline, and the instrument valve is also closed. At this time, the test cap 6 can be removed, and a temporary pressure transmitter can be installed on the mounting joint 4, and then the valve stem 2 is turned up, the pressure channel 3 is connected with the measuring pipeline, and the instrument valve is also opened. The temporary pressure transmitter can monitor the medium pressure in the measuring pipeline. The whole process does not require shutdown and can be completed online. The utility model can not only facilitate the calibration of the pressure transmitter, but also facilitate the installation of a temporary pressure transmitter to monitor the on-site medium status without stopping the machine when the pressure transmitter fails, effectively improving the calibration efficiency and use effect of the pressure transmitter.

[0027] The descriptions of the orientation or relative position relationship of the structure in the present invention, such as the orientation or relative position relationship indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are based on the orientation or position relationship shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

Claims

1. An instrument valve for a pressure transmitter, comprising a valve body (1) and a valve stem (2), characterized in that: A pressure-inducing channel (3) is provided in the valve stem (2), and a mounting joint (4) and a valve core (5) are provided at both ends of the valve stem (2). The two ends of the pressure-inducing channel (3) are respectively arranged on the mounting joint (4) and the valve core (5). A test cap (6) is detachably provided on the mounting joint (4). The valve core (5) is arranged in the inner cavity of the valve body (1), and a detection channel (7) that matches the valve core (5) is provided at the bottom of the cavity of the valve body (1).

2. The instrument valve for a pressure transmitter according to claim 1, wherein: The pressure-inducing channel (3) is arranged to penetrate the valve stem (2) from top to bottom, and the bottom end opening of the pressure-inducing channel (3) faces the detection channel (7).

3. The instrument valve for a pressure transmitter according to claim 1, wherein: The bottom end opening of the pressure-inducing channel (3) faces the inner cavity side wall of the valve body (1).

4. The instrument valve for a pressure transmitter according to claim 2 or 3, characterized in that: The bottom of the valve core (5) is provided with a sealing head, which is in a truncated cone shape, and the top of the detection channel (7) is matched with the sealing head.

5. The instrument valve for a pressure transmitter according to claim 4, characterized in that: A sealing ring (8) is provided on the inner side of the top of the valve body (1), a locking sleeve (9) is provided on the outer side of the top of the valve body (1), and a locking nut (10) is provided on the locking sleeve (9).

6. The instrument valve for a pressure transmitter according to claim 5, characterized in that: A handle (11) is detachably provided on the valve stem (2).

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