CN116357779A - Three valves and differential pressure transmitter - Google Patents

Abstract

The application relates to a three valve block and a differential pressure transmitter. A triple valve set for a differential pressure transmitter comprising: the valve body is internally provided with a first chamber and a second chamber, and is provided with a first measuring medium interface and a first transmitter interface which are communicated with the first chamber, and a second measuring medium interface and a second transmitter interface which are communicated with the second chamber; a valve stem assembly including a valve stem extending into the interior of the valve body, the valve stem being capable of moving longitudinally therealong to communicate or isolate the first chamber from the second chamber; wherein the first measuring medium connection and the second measuring medium connection are arranged on the same side of the valve body and are arranged transversely to the longitudinal axis of the valve rod. The three-valve set provided by the invention has the advantages of simple structure, convenience in installation, reliability in sealing, low manufacturing cost and the like, and is particularly suitable for miniaturized micro differential pressure measurement process occasions.

Description

Three valves and differential pressure transmitter

Technical Field

The invention relates to the technical field of fluid measurement, in particular to a three-valve group for a differential pressure transmitter and the differential pressure transmitter with the three-valve group.

Background

The differential pressure transmitter is a main instrument for measuring parameters such as differential pressure, liquid level and the like in an industrial field, and comprises a sensitive detection element, so that the detection element is protected from being damaged when instantaneous high pressure or high differential pressure occurs, and a three-valve group is introduced to be matched with the differential pressure transmitter for use.

According to the prior art, such a triple valve block is constructed with three valves, including high-pressure and low-pressure valves, which are typically disposed at both sides of a valve body, and a balance valve disposed at a middle position of the valve body. The on-off of the corresponding fluid channels is controlled by controlling the on-off of the three valves, wherein the high-pressure valve and the low-pressure valve are respectively used for switching on or switching off the high-pressure measuring channel and the low-pressure measuring channel of the differential pressure transmitter, and the balance valve is used for controlling the communication or switching off between the high-pressure measuring channel and the low-pressure measuring channel.

The common three valves for differential pressure transmitters in the market at present are assembled by metal processing parts such as stainless steel, and the structure is complex, and especially the sealing mechanism is more, and not only the cost is expensive, but also the problem of easy leakage exists in the use. Moreover, because the known three-valve assembly has huge volume, the matched connection with a differential pressure transmitter is difficult to optimize when in use, and the installation and the debugging are inconvenient. The above drawbacks are more pronounced when such a tri-valve set is applied in a micro differential pressure measurement scenario.

Disclosure of Invention

The object of the present invention is to propose a triple valve set and a differential pressure transmitter which at least partially overcome the drawbacks of the prior art. In particular, the three-valve group has simple and compact structure, small volume, convenient flexible installation and matching, and can be processed and manufactured by a simple process, thereby greatly reducing the manufacturing cost.

According to a first aspect of the present invention there is provided a triple valve set for a differential pressure transmitter comprising: the valve body is internally provided with a first chamber and a second chamber, and is provided with a first measuring medium interface and a first transmitter interface which are communicated with the first chamber, and a second measuring medium interface and a second transmitter interface which are communicated with the second chamber; a valve stem assembly including a valve stem extending into the interior of the valve body, the valve stem being movable longitudinally therealong to communicate or isolate the first chamber from the second chamber. Wherein the first and second measuring medium interfaces are disposed on the same side of the valve body and are arranged transversely with respect to the longitudinal axis of the valve stem.

According to the invention, the first measuring medium connection and the second measuring medium connection are arranged on the same side of the valve body, on the side of the valve body which is transverse to the longitudinal direction of the valve rod. The arrangement is arranged according to the layout, so that the three-valve group has a simple and compact structure as a whole and is convenient to be matched with a differential pressure transmitter for use. On the basis, through the corresponding valve body structural design, the three-valve group has the advantages of convenient installation, reliable sealing, low manufacturing cost and the like.

Preferably, according to an embodiment of the present invention, the first chamber may be configured as a first circular hole, the second chamber may be configured as a second circular hole, the first and second circular holes are communicated with each other through a central hole, and at least the first circular hole is coaxial with the central hole.

According to one embodiment of the invention, the first circular hole comprises an end hole section opening to the first end face of the valve body and a bottom hole section connected with the central hole, and the valve rod extends into the valve body from the first end face of the valve body and can axially move in the first circular hole to close or release the central hole opening positioned on the bottom face of the bottom hole section.

Here, according to an embodiment of the invention, the first measuring medium connection and the first transmitter connection communicate with a bottom hole section of the first circular hole at least in the event that the central hole opening is released.

According to one embodiment of the invention, the valve stem comprises a plug adapted to cooperate with the central bore opening to close or release the opening.

Preferably, the bottom surface of the bottom hole section of the first round hole is a plane, and the top is in a conical structure.

According to one embodiment of the invention, the valve stem is provided with an actuating mechanism at the end opposite the plug, by means of which the valve stem can be actuated from outside the valve body.

According to one embodiment of the invention, the valve stem comprises a guide shaft section, the first circular hole comprises a guide bore section between an end bore section and a bottom bore section, the guide shaft section is adapted to cooperate with the guide bore section for guiding axial movement of the valve stem in the first circular hole.

Further, the guide bore Duan Gouzao of the first circular bore is a threaded bore section with internal threads, and the guide shaft section of the valve stem has external threads matching the internal threads, whereby axial movement of the valve stem in the first circular bore can be achieved by screwing or unscrewing the valve stem.

According to one embodiment of the invention, the valve rod comprises a sealing shaft section, and a sealing mechanism is arranged between the periphery of the sealing shaft section and the inner wall of the end hole section of the first round hole and used for sealing the opening of the first round hole on the first end face of the valve body in a sealing manner so as to prevent medium leakage.

Preferably, the sealing mechanism includes a groove formed in the outer periphery of the sealing shaft section and a seal ring embedded in the groove. In this way, a low-cost and simple and reliable radial seal can be achieved.

According to one embodiment of the invention, the first circular hole, the central hole and the second circular hole form a through hole penetrating from the first end face to the second end face of the valve body. According to the method, the main pore canal inside the valve body adopts a straight-through structure design, so that the valve body can be manufactured by a simple process.

Further, the second circular hole comprises an end hole section which is opened to the second end surface of the valve body, and a plug is detachably arranged in the end hole section. Preferably, the plug can seal and close the opening of the second round hole positioned on the second end face of the valve body.

Further, the end hole section of the second round hole is configured as a threaded hole section with internal threads, and the plug is configured as a plug screw with external threads matching the internal threads. A sealing washer, in particular an elastic sealing washer, is preferably arranged between the plug head and the second end face of the valve body. In this way, a low-cost and simple and reliable end face seal can be achieved, and at the same time the sealing force can also be adjusted on the basis of the screw-on tightening force.

Still further, the second circular bore includes a bottom bore section coupled to the central bore, and the second measurement medium interface and the second transmitter interface are in communication with the bottom bore section.

According to one embodiment of the invention, the first and second transmitter interfaces are arranged on the opposite side of the valve body from the first and second measuring medium interfaces. According to the interface layout setting scheme provided by the invention, the main pore canal through structure design is combined, all pore canals of the valve body can extend in two directions only (firstly, the longitudinal extending direction of the main pore canal from the first end face to the second end face of the valve body, and secondly, the transverse extending direction of the interface pore canal from the side face of the valve body to the inside), so that the valve body can be manufactured by adopting simple process and equipment, and the manufacturing cost of the three-valve group is greatly reduced.

According to a second aspect of the present invention, there is provided a differential pressure transmitter provided with a triple valve set as described above.

Preferably, according to an embodiment of the present invention, the first measuring medium interface is used for introducing a low pressure measuring medium, the second measuring medium interface is used for introducing a high pressure measuring medium, the first measuring medium interface, the first chamber, the first transmitter interface form a low pressure measuring channel of a differential pressure transmitter, and the second measuring medium interface, the second chamber, the second transmitter interface form a high pressure measuring channel of a differential pressure transmitter.

According to one embodiment of the invention, a first shut-off valve is arranged in the pressure line at or connected to the first measuring medium connection, and a second shut-off valve is arranged in the pressure line at or connected to the second measuring medium connection. Accordingly, based on the interface layout arrangement scheme provided by the invention, the stop valve can be flexibly designed and arranged according to specific equipment configuration, technical requirements and installation conditions, and different types of valves, such as plug valves, plunger valves, butterfly valves and the like, are allowed to be selected.

It goes without saying that the features and advantages of the three-valve set proposed according to the first aspect of the invention are equally applicable to the differential pressure transmitter of the second aspect of the invention. It is particularly worth mentioning that according to some embodiments of the triple valve set of the present invention, in addition to the triple valve set being simpler and more compact in overall structure and being convenient for use with differential pressure transmitters, the structural design of the valve body is simplified to the greatest extent, enabling its low cost manufacture with simple processes and equipment while allowing rational configuration and optimization of the sealing mechanism, as compared to the prior art. Therefore, the three-valve set for the differential pressure transmitter can be realized, has the advantages of simple structure, small volume, convenient installation and use, few sealing parts and reliable effect, reduces the maintenance cost while reducing the leakage risk, can be well matched with the miniaturized micro differential pressure measurement process occasion, and provides a flexible and suitable field solution for users.

Drawings

Exemplary embodiments of the present invention are illustrated in the accompanying drawings. The embodiments and figures disclosed herein are to be regarded as illustrative rather than restrictive. It is further noted that, for clarity of illustration, some of the details of construction in the drawings are not drawn to scale.

FIG. 1 is a schematic diagram of a three-way valve set for a differential pressure transmitter, illustrating a first chamber (low pressure measurement channel) isolated from a second chamber (high pressure measurement channel), with a valve stem in a position closing a central bore opening, according to one embodiment of the present invention;

FIG. 2 is a schematic view of a valve body according to one embodiment of the invention;

FIG. 3 is a schematic view of a partial structure of a valve body according to one embodiment of the present invention;

FIG. 4 is a schematic illustration of a valve stem according to one embodiment of the present invention;

fig. 5 is a schematic view of a triple valve set according to an embodiment of the present invention, illustrating a state in which a first chamber (low pressure measurement passage) is communicated with a second chamber (high pressure measurement passage), and a valve stem is in a position to release a central hole opening.

Detailed Description

The technical scheme of the embodiment of the invention will be described below with reference to the accompanying drawings. It is apparent that the described embodiments relate only to some, but not all, embodiments of the invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the disclosed embodiments, are within the scope of the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between different objects and not for describing a particular sequential order. Also, the terms "comprising" and "having," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. It will be understood by those within the art that certain terms, such as "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "longitudinal," "transverse," etc., are used in the description of the present application and in the claims to indicate or relate to the orientation or position of the device, mechanism, structure, or element as shown, merely for convenience of description and to simplify the description, but do not denote or imply that the device, mechanism, structure, or element as referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the invention.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one implementation of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art and are to be specifically interpreted according to their context in the context of the related art description.

The invention will be described in detail below with reference to the drawings in connection with embodiments.

Fig. 1-5 show schematic structural views of a triple valve stack for a differential pressure transmitter and its valve body and valve stem of the present invention.

The present invention provides a triple valve set for a differential pressure transmitter, as shown in fig. 1 and 5, the triple valve set comprising: a valve body 100 having a first chamber and a second chamber formed therein, the valve body having a first measurement medium port 102 and a first transmitter port 105 leading to the first chamber and a second measurement medium port 101 and a second transmitter port 104 leading to the second chamber; a valve stem assembly 200 comprising a valve stem 201 extending into the interior of the valve body, the valve stem being movable longitudinally therealong to communicate or isolate the first chamber from the second chamber. According to the invention, the first measuring medium connection and the second measuring medium connection are arranged on the same side of the valve body and are arranged transversely to the longitudinal axis of the valve rod. That is to say that the first measuring medium connection 102 and the second measuring medium connection 101 are arranged on the valve body on the side of the valve body that is transverse to the longitudinal direction of the valve stem and on the same side of the valve body, see in particular fig. 1, 2 and 5. The arrangement is arranged according to the layout, so that the three-valve group has a simple and compact structure as a whole and is convenient to be matched with a differential pressure transmitter for use.

In the technical proposal provided by the invention, the relative position relation between the trend of the valve rod and the arrangement positions of the two measuring medium interfaces (namely, the intersection or the transverse intersection) and the relative position relation between the two measuring medium interface arrangement positions (namely, the two measuring medium interface arrangement positions are positioned on the same side of the valve body) are specified at the same time. It will be appreciated that the above-described "longitudinal", "transverse", "lateral" or "side" are merely relative concepts for expressing the positional relationship, and that the relative positional relationship specified is not dependent upon the particular shape of the valve body itself.

Fig. 2 is a schematic view of a valve body according to one embodiment of the invention. The valve body 100 is, for example, a metal casting, and may be prismatic, such as a cuboid, so that the cuboid defines two end faces and four side faces, and in this case, the "longitudinal direction" may correspond to the direction from the first end face to the second end face of the valve body, and the "transverse direction" may be a direction intersecting (or intersecting, preferably perpendicular to) the "longitudinal direction; the valve body 100 may also be cylindrical, so that the cylindrical valve body defines two end faces and circumferential sides, in which case the "longitudinal" may correspond to the direction of the valve body from the first end face to the second end face, i.e. the "axial" direction of the cylinder, and the "transverse" direction is the direction intersecting (or intersecting, preferably perpendicular) the "longitudinal" direction, i.e. the "radial" direction of the cylinder.

According to one embodiment of the invention, the first chamber may be configured as a first circular hole 300 and the second chamber may be configured as a second circular hole 103, the first circular hole 300 and the second circular hole 103 being in communication with each other through the central hole 107, at least the first circular hole 300 being coaxial with the central hole 107. Preferably, the second circular hole 103 is coaxial with both the first circular hole 300 and the central hole 107, which is particularly beneficial for simplifying tooling and process operations during valve body manufacturing.

In this respect, it is noted that, in particular, the second circular hole 103 does not have to be exactly coaxial with the first circular hole 300 and/or the central hole 107, but it is only necessary to ensure that the central hole has openings open to the first circular hole and the second circular hole, respectively, which can be brought into communication.

Fig. 3 is a schematic view of a partial structure of a valve body according to an embodiment of the present invention. As shown, the first circular bore 300 includes an end bore section 303 opening to a first end face of the valve body and a bottom bore section 301 connected to the central bore 107, and the valve stem 201 extends from the first end face of the valve body into the interior of the valve body and is movable axially within the first circular bore 300 to close or release the opening of the central bore 107 at the bottom face of the bottom bore section 301. When the central bore 107 opening is closed, the first and second chambers are isolated from each other, as shown in fig. 1; when the opening of the central bore 107 is released, the first and second chambers are brought into communication with each other, as shown in fig. 5.

The first measuring medium connection 102 and the first transmitter connection 105 communicate with the bottom hole section 301 of the first circular hole 300 at least when the opening of the central hole 107 is released. This means that when the triple valve set of the present invention is used in conjunction with a differential pressure transmitter, the high and low pressure measurement channels are made to communicate with each other with the first and second chambers in communication with each other, as shown in fig. 5.

Fig. 4 is a schematic view of a valve stem according to one embodiment of the invention. The valve stem 201 may be a metal machined piece. As shown, the valve stem 201 includes a plug 211 that is adapted to mate with the central bore 107 opening to close or release the opening. According to one embodiment of the invention, the bottom surface of the bottom hole section 301 of the first circular hole 300 is planar, and the top head 211 is in a tapered configuration, and this mating structure is particularly advantageous for sealingly closing the opening of the central hole 107 in the bottom surface of the bottom hole section 301.

According to one embodiment of the invention, the valve stem 201 is provided at the end opposite the plug 211 with an operating mechanism 214 by means of which the valve stem can be manipulated from outside the valve body to effect an axial displacement of the valve stem in the first circular bore.

Referring to fig. 3 and 4 in combination with fig. 1 and 5, it can be seen that the valve stem 201 includes a guide shaft section 212 and the first bore 300 includes a guide bore section 302 interposed between the end bore section and the bottom bore section, the guide shaft section being adapted to cooperate with the guide bore section to guide axial movement of the valve stem in the first bore. According to one embodiment of the invention, the pilot bore section 302 of the first circular bore 300 is configured as a threaded bore section with an internal thread, and the pilot shaft section 212 of the valve rod 201 is provided with an external thread matching the internal thread, whereby an axial displacement of the valve rod in the first circular bore can be achieved by screwing in or screwing out the valve rod 201.

Based on the embodiment of the threaded engagement between the valve stem and the first circular hole, the operating mechanism 214 may include an engagement structure of a screwing tool (such as a screwdriver or a wrench) disposed at a corresponding end of the valve stem, for example, a straight or cross slot corresponding to the screwdriver, or an internal hexagonal or external hexagonal engagement structure corresponding to the socket wrench. Of course, besides manual operation, the valve rod can be operated by adopting electromagnetic, electric, pneumatic and other driving modes, so that the automatic and accurate control of the axial movement of the valve rod is realized.

Referring to fig. 3 and 4, and in conjunction with fig. 1 and 5, the valve rod 201 includes a sealing shaft section, and a sealing mechanism is disposed between the outer periphery of the sealing shaft section and the inner wall of the end hole section 303 of the first round hole 300, so as to seal the opening of the first round hole located at the first end face of the valve body, so as to prevent leakage of the medium. Preferably, the sealing mechanism includes a groove 213 formed in the outer periphery of the seal shaft section and a seal ring 202 embedded in the groove. Preferably, the seal ring 202 is an elastic seal ring made of fluororubber or Polytetrafluoroethylene (PTFE), and preferably has a circular cross section. When the three-valve set is matched with a differential pressure transmitter for use, particularly for a low-pressure measuring channel, the radial sealing acting force generated by the elastic fit between the O-shaped sealing ring and the periphery of the sealing shaft section and the inner wall of the end hole section 303 of the first round hole 300 is enough, so that the low-cost, simple and reliable radial sealing can be realized on the low-pressure side.

As shown in fig. 2, the first circular hole 300, the central hole 107 and the second circular hole 103 form a through hole penetrating from the first end surface to the second end surface of the valve body. According to the method, the main pore canal inside the valve body adopts a straight-through structure design, so that the valve body can be manufactured by a simple process.

According to one embodiment of the invention, the second circular bore 103 includes an end bore section open to the second end face of the valve body in which a plug 401 is removably mounted, as shown in fig. 1 and 5.

The plug 401 can seal off the opening of the second round hole 103 located at the second end face of the valve body. When the three-valve set is matched with a differential pressure transmitter for use, the opening can be used as a pressure relief opening of a high-pressure measuring channel.

The end hole section of the second circular hole 103 may be configured as a threaded hole section with an internal thread, and the plug 401 is configured as a screw plug with an external thread matching the internal thread. A sealing washer, in particular an elastic sealing washer, is preferably arranged between the plug head and the second end face of the valve body. According to the method, when the three-valve group is matched with a differential pressure transmitter for use, particularly for a high-pressure measuring channel, the end face seal with low cost, simplicity and reliability can be realized, and meanwhile, the magnitude of the axial sealing acting force can be adjusted based on the screwing fastening force.

According to one embodiment of the invention, the second circular hole 103 comprises a bottom hole section connected to the central hole 107, to which the second measurement medium interface 101 and the second transmitter interface 104 are connected. Preferably, the bottom hole section of the second circular hole 103 may be configured as a cylindrical hole section. Of course, the bottom hole section of the second round hole is mainly used for realizing the communication function, and is constructed as a threaded hole section, which is not required either.

According to one embodiment of the invention, the first transmitter interface 105 and the second transmitter interface 104 are arranged on opposite sides of the valve body from the first measurement medium interface 102 and the second measurement medium interface 101, as shown in fig. 2. According to the interface layout setting scheme provided by the invention, the main pore canal through structure design is combined, all pore canals of the valve body can extend in two directions only (firstly, the longitudinal extending direction of the main pore canal from the first end face to the second end face of the valve body, and secondly, the transverse extending direction of the interface pore canal from the side face of the valve body to the inside), so that the valve body can be manufactured by adopting simple process and equipment, and the manufacturing cost of the three-valve group is greatly reduced.

It is noted that the above arrangement/positional relationship of the transmitter interface and the measurement medium interface in the three-way valve set is preferred, but not required. Within the framework of the invention, the first transmitter interface 105 and the second transmitter interface 104 can also be arranged on other sides of the valve body, depending on design requirements, structural type and installation conditions, only by ensuring that the first measuring medium interface 102 and the first transmitter interface 105 communicate with each other via the first chamber, and that the second measuring medium interface 101 and the second transmitter interface 104 communicate with each other via the second chamber.

The invention also provides a differential pressure transmitter, in particular a micro differential pressure transmitter, which is provided with the three valve groups. As described above, the three-valve set of the invention has the advantages of simple structure, compact design, miniaturization, convenient maintenance and the like, and is particularly suitable for micro differential pressure transmitters.

Preferably, the first measuring medium interface 102 is used for introducing low pressure measuring medium, the second measuring medium interface 101 is used for introducing high pressure measuring medium, the first measuring medium interface 102, the first chamber, the first transmitter interface 105 form a low pressure measuring channel of a differential pressure transmitter, and the second measuring medium interface 101, the second chamber, the second transmitter interface 104 form a high pressure measuring channel of a differential pressure transmitter. According to the design of the three-valve group provided by the invention, when the three-valve group is matched with a differential pressure transmitter, the sealing mechanism is reasonably configured and optimized based on the difference of high pressure and low pressure. As described above, for high pressure measurement channels, an end seal that is suitable for high pressure and adjustable can be formed between the plug (screw plug) and the end face of the valve body; while for low pressure measuring channels a radial seal for low pressure can be formed between the outer circumference of the shaft section and the inner wall of the bore section. Therefore, compared with the prior art, the differential pressure transmitter and the three valve groups thereof have the following advantages: the sealing structure is simple, the sealing parts are few and the effect is reliable, and the maintenance cost is reduced while the leakage risk is reduced.

According to the invention, it is possible to provide a first shut-off valve in the pressure line connected to or at the first measuring medium connection and a second shut-off valve in the pressure line connected to or at the second measuring medium connection. The shut-off valve is used for introducing or shutting off the measuring medium, and can be flexibly designed and arranged according to the equipment configuration, technical requirements and installation conditions, and the specific position and form of the shut-off valve are not limited, and can be, for example, a plug valve (such as a ball plug valve or a cylindrical plug valve), a plunger valve, a butterfly valve and the like.

Typically, a triple valve stack of a differential pressure transmitter includes a high pressure valve, a low pressure valve, and a balancing valve. The valve rod can be operated to function as a so-called balancing valve, the first shut-off valve being a low-pressure valve and the second shut-off valve being a high-pressure valve. The differential pressure transmitter and the working mode of the three valve groups of the differential pressure transmitter are as follows: when the operation is started, the balance valve is opened (the valve rod is operated to communicate the high-pressure measuring channel and the low-pressure measuring channel), then the high-pressure valve and the low-pressure valve are opened (the high-pressure measuring medium and the low-pressure measuring medium are introduced), then the balance valve is closed (the valve rod is operated to cut off the high-pressure measuring channel and the low-pressure measuring channel), and then the measuring operation can be executed; when stopping operation: the balancing valve is opened (the valve rod is operated to communicate the high and low pressure measuring channels), then the high and low pressure valves are closed (the high and low pressure measuring media are not connected any more), and then the measuring operation is stopped.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims (20)

1. A triple valve set for a differential pressure transmitter, comprising:

a valve body (100) in which a first chamber and a second chamber are formed, the valve body being provided with a first measurement medium interface and a first transmitter interface leading to the first chamber, and a second measurement medium interface and a second transmitter interface leading to the second chamber;

a valve stem assembly (200) comprising a valve stem (201) extending into the interior of the valve body, the valve stem being movable longitudinally therealong to communicate or isolate the first chamber from the second chamber;

characterized in that the first measuring medium connection and the second measuring medium connection are arranged on the same side of the valve body and are arranged transversely to the longitudinal axis of the valve rod.

2. The three-valve set according to claim 1, characterized in that the first chamber is configured as a first circular hole (300) and the second chamber is configured as a second circular hole (103), the first and second circular holes being in communication with each other through a central hole (107), at least the first circular hole (300) being coaxial with the central hole.

3. The valve manifold of claim 2, wherein the first circular hole (300) includes an end hole section (303) opening to a first end face of the valve body and a bottom hole section (301) connected to the center hole (107), and the valve stem (201) extends from the first end face of the valve body into the valve body and is axially movable in the first circular hole (300) to close or release the opening of the center hole (107) located at a bottom face of the bottom hole section (301).

4. A valve manifold according to claim 3, characterized in that the first measuring medium interface and the first transmitter interface communicate with a bottom hole section (301) of the first circular hole (300) at least in case the central hole (107) opening is released.

5. A valve manifold according to claim 3, characterized in that the valve stem (201) comprises a plug (211) which cooperates with the central bore (107) opening to close or release the opening.

6. The three-valve set according to claim 5, characterized in that the bottom surface of the bottom hole section (301) of the first circular hole (300) is a plane, and the plug (211) is of conical configuration.

7. A valve manifold according to claim 5, characterized in that the valve stem (201) is provided with an operating mechanism at the end opposite the plug (211), by means of which the valve stem can be operated from outside the valve body.

8. A valve manifold according to claim 3, wherein the valve stem (201) comprises a guide shaft section (212), the first circular hole (300) comprising a guide hole section (302) between an end hole section and a bottom hole section, the guide shaft section being adapted to cooperate with the guide hole section for guiding the axial movement of the valve stem in the first circular hole.

9. The valve manifold according to claim 8, characterized in that the pilot bore section (302) of the first circular bore (300) is configured as a threaded bore section with an internal thread, and the pilot shaft section (212) of the valve rod (201) is provided with an external thread matching the internal thread, whereby an axial displacement of the valve rod in the first circular bore can be achieved by screwing or unscrewing the valve rod (201).

10. A valve manifold according to claim 3, characterized in that the valve stem (201) comprises a sealing shaft section, between the outer periphery of which sealing shaft section and the inner wall of the end hole section (303) of the first circular hole (300) a sealing mechanism is provided.

11. The valve manifold of claim 10, wherein the sealing mechanism comprises a groove (213) formed in the outer periphery of the sealing shaft section and a sealing ring (202) embedded in the groove.

12. The three-valve set according to any one of claims 2 to 11, characterized in that the first circular hole (300), the central hole (107) and the second circular hole (103) form a through hole that runs through from the first end face to the second end face of the valve body.

13. A valve manifold according to claim 12, characterized in that the second circular hole (103) comprises an end hole section opening to the second end face of the valve body, in which end hole section a plug (401) is detachably mounted.

14. The three-valve set according to claim 13, characterized in that the plug (401) is capable of sealingly closing the opening of the second circular hole (103) at the second end face of the valve body.

15. The valve manifold as claimed in claim 14, characterized in that the end bore section of the second circular bore (103) is configured as a threaded bore section with an internal thread, and the plug (401) is configured as a screw plug with an external thread matching the internal thread.

16. The valve manifold of claim 14, wherein the second circular bore (103) includes a bottom bore section connected to the central bore (107), the second measurement medium interface and the second transmitter interface being in communication with the bottom bore section.

17. The valve manifold of claim 1, wherein the first and second transmitter interfaces are disposed on a side of the valve body opposite the first and second measurement medium interfaces.

18. A differential pressure transmitter provided with a triple valve set as claimed in any one of claims 1 to 17.

19. The differential pressure transmitter of claim 18, wherein the first measurement medium interface is for introducing a low pressure measurement medium, the second measurement medium interface is for introducing a high pressure measurement medium, the first measurement medium interface, the first chamber, the first transmitter interface form a low pressure measurement channel of the differential pressure transmitter, and the second measurement medium interface, the second chamber, the second transmitter interface form a high pressure measurement channel of the differential pressure transmitter.

20. The differential pressure transmitter of claim 18 or 19, wherein a first shut-off valve is provided in the pressure line at or connected to the first measurement medium interface and a second shut-off valve is provided in the pressure line at or connected to the second measurement medium interface.

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