CN217583285U - Three-valve set and differential pressure transmitter - Google Patents

Abstract

The application relates to a three-valve set and a differential pressure transmitter. Three-valve set for differential pressure transmitter comprising: the valve body is provided with a first measuring medium interface and a first transmitter interface which are communicated with the first cavity, and a second measuring medium interface and a second transmitter interface which are communicated with the second cavity; 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 measurement medium port and the second measurement medium port are provided on the same side of the valve body and are arranged transversely with respect to the longitudinal axis of the valve stem. The utility model provides a three valves have simple structure, simple to operate, sealed reliable and low in manufacturing cost's advantage, are particularly suitable for being used for miniaturized differential pressure measurement's technology occasion.

Description

Three-valve group and differential pressure transmitter

Technical Field

The utility model relates to a fluid measurement technical field especially relates to a differential pressure transmitter who is used for differential pressure transmitter's three valves and is furnished with this three valves.

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, comprises a sensitive detection element, and introduces three valve groups to be matched with the differential pressure transmitter for use in order to protect the detection element and avoid damage when instantaneous high pressure or high differential pressure occurs.

According to the prior art, such a triple valve group is constructed with three valves, including a high-pressure valve and a low-pressure valve, which are usually arranged on both sides of the valve body, and a balancing valve arranged in the middle of the valve body. The on-off of the corresponding fluid channel 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 the switching off between the high-pressure measuring channel and the low-pressure measuring channel.

The three valve sets for the common differential pressure transmitter in the current market are assembled by metal processing parts such as stainless steel and the like, the structure is complex, particularly, the sealing mechanisms are more, the manufacturing cost is high, and the problem of easy leakage exists in the use process. Moreover, the known three-valve set has huge assembly volume, so that the three-valve set is difficult to optimize in matching connection with a differential pressure transmitter during use, and inconvenient to install and debug. When the three valve groups are applied to the micro differential pressure measurement field, the defects are more prominent.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a three valves and a differential pressure transmitter to at least some overcome the defect that exists among the prior art. Particularly, the three-valve set has the advantages of simple and compact structure, small volume, convenience for flexible installation and matching, and capability of being processed and manufactured by a simple process, thereby greatly reducing the manufacturing cost.

According to the utility model discloses a first aspect provides a three valves for differential pressure transmitter, include: the valve body is internally provided with a first cavity and a second cavity, and is provided with a first measuring medium interface and a first transmitter interface which are communicated with the first cavity, and a second measuring medium interface and a second transmitter interface which are communicated with the second cavity; 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 with or isolate the first chamber from the second chamber. Wherein the first measurement medium port and the second measurement medium port are disposed on the same side of the valve body and are disposed transverse to a longitudinal axis of the valve stem.

According to the utility model discloses, first measurement medium interface and second measurement medium interface set up be in on the valve body relative valve rod vertically is in horizontal valve body side, sets up in the same one side of valve body moreover. According to the layout, the three valve groups are simple and compact in structure on the whole and convenient to use with the differential pressure transmitter in a matched mode. On the basis, through the corresponding structural design of the valve body, the three-valve group has the advantages of convenience in installation, reliability in 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 circular hole and the second circular hole being in communication with each other through a central hole, at least the first circular hole being coaxial with the central hole.

According to the utility model discloses an embodiment, first round hole include to the first terminal surface open-ended of valve body port section and with the bottom hole section that the centre bore links to each other, the valve rod stretches into inside the valve body from the first terminal surface of valve body to can axial displacement in first round hole, be located with sealing or release the centre bore opening of bottom hole section bottom surface.

Here, according to an embodiment of the invention, the first measuring medium interface and the first transmitter interface communicate with the bottom bore section of the first round bore at least in case the central bore opening is released.

According to an embodiment of the invention, the valve rod 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 head is in a conical structure.

According to an embodiment of the invention, the valve rod is provided with an operating mechanism at an end opposite to the plug, by means of which the valve rod can be operated from outside the valve body.

According to the utility model discloses an embodiment, the valve rod includes the guide shaft section, first round hole includes the guide hole section between end hole section and bottom hole section, the guide shaft section be suitable for with the cooperation of guide hole section is used for right the axial displacement of valve rod in first round hole leads.

Further, the guide bore section of the first round bore is designed as a threaded bore section with an internal thread, and the guide shaft section of the valve rod has an external thread matching the internal thread, whereby an axial displacement of the valve rod in the first round bore can be achieved by screwing in or unscrewing the valve rod.

According to the utility model discloses an embodiment, the valve rod includes sealed shaft part, at this sealed shaft part periphery with be equipped with sealing mechanism between the end hole section inner wall of first round hole for seal the opening that first round hole is located the first terminal surface of valve body sealedly, in case the medium leaks.

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

According to the utility model discloses an embodiment, first round hole, centre bore and second round hole form follows the through-hole that first terminal surface to second terminal surface of valve body link up. According to the valve body, the main pore passage in the valve body is designed to be of a straight-through structure, so that the valve body can be processed and manufactured by a simple process.

Furthermore, the second round hole comprises an end hole section which is opened towards the second end face of the valve body, and a plug is detachably arranged in the end hole section. Preferably, the plug can hermetically seal the opening of the second round hole on the second end face of the valve body.

Furthermore, the end hole section of the second circular hole is configured as a threaded hole section with an internal thread, and the plug is configured as a plug screw and has an external thread matching the internal thread. Preferably, a sealing gasket, in particular an elastic sealing gasket, is arranged between the plug head and the second end face of the valve body. According to this, can realize a low-cost and simple reliable end face seal, simultaneously, the sealed effort also can be based on the spiro union fastening force is adjusted.

Further, the second bore includes a bottom bore section connected to the central bore, the second measurement medium interface and the second transducer interface being in communication with the bottom bore section.

According to the utility model discloses an embodiment, first changer interface and second changer interface set up the valve body with one side that first measuring medium interface and second measuring medium interface oppose. According to this, based on the utility model provides an interface overall arrangement sets up the scheme, combines the above the direct structural design of dominant pore, all pores of valve body can only extend in two directions (firstly the dominant pore lets in inside horizontal extending direction from the valve body side from the longitudinal extension direction of the first terminal surface of valve body to second terminal surface) to can take simple technology and equipment to manufacture the valve body, reduce the cost of three valves by a wide margin.

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

Preferably, according to the utility model discloses an embodiment, first measurement medium interface is used for introducing low pressure measurement medium, the second measurement medium interface is used for introducing high pressure measurement medium, first measurement medium interface first cavity first transmitter interface forms differential pressure transmitter's low pressure measurement passageway, and the second measurement medium interface the second cavity the second transmitter interface forms differential pressure transmitter's high pressure measurement passageway.

According to the utility model discloses an embodiment be provided with first stop valve in first measurement medium kneck or the pressure pipeline that draws that links to each other with it be provided with the second stop valve in second measurement medium kneck or the pressure pipeline that draws that links to each other with it. According to this, based on the utility model provides an interface overall arrangement sets up the scheme, the stop valve can design and arrange according to specific equipment configuration, technical requirement and installation condition are nimble, allows selecting different forms of valve moreover, for example plug valve, plunger valve, butterfly valve etc..

It goes without saying that the features and advantages of the three-valve group according to the first aspect of the present invention are equally applicable to the differential pressure transmitter of the second aspect of the present invention. It is particularly worth mentioning, according to the utility model discloses some embodiments of three valves, compare with prior art, except that three valves overall structure is simple more compact, be convenient for with the supporting use of differential pressure transmitter, the structural design of valve body obtains retrenching at the at utmost, can realize its low-cost manufacturing with simple technology and equipment, allows rational configuration and optimization sealing mechanism simultaneously. Therefore, the utility model discloses can realize such differential pressure transmitter three valves, its simple structure, small, installation convenient to use, sealed part is few and the effect is reliable, has reduced the maintenance working cost when reducing the leakage risk, can match well in miniaturized little differential pressure measuring's technology occasion, provides nimble, suitable on-the-spot solution for the user.

Drawings

Exemplary embodiments of the invention are shown in the drawings. The embodiments and figures disclosed herein are to be regarded as illustrative rather than restrictive. It is also noted that for purposes of clarity of illustration, certain features are not necessarily drawn to scale in the drawings.

Fig. 1 is a schematic diagram of a three-valve set for a differential pressure transmitter according to an embodiment of the present invention, illustrating a state in which a first chamber (low pressure measurement channel) is isolated from a second chamber (high pressure measurement channel), and a valve stem is in a position to close a central hole opening;

fig. 2 is a schematic view of a valve body according to an embodiment of the invention;

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

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

fig. 5 is a schematic diagram of a three-valve set according to an embodiment of the present invention, illustrating a state where a first chamber (low pressure measurement channel) is communicated with a second chamber (high pressure measurement channel), and a valve rod is in a position to release an opening of a center hole.

Detailed Description

The technical solution of the embodiment of the present invention will be described below with reference to the accompanying drawings. It is clear that the described embodiments relate only to a part of the embodiments of the invention, and not to all embodiments. Based on the embodiments disclosed in the present application, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variant 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 steps or elements 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 skilled in the art that, in the description of the present application and the claims, certain terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "longitudinal", "transverse", and the like, are used in an orientation or positional relationship indicated based on the orientation or positional relationship shown in the drawings, which is for convenience only to facilitate description of the invention and to simplify description, and do not represent or imply that the referenced device, mechanism, structure, or element must have a particular orientation, be constructed and operated in a particular orientation, and thus the above-described terms are not to be construed as limiting the present invention.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one implementation of the invention. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art 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 may be specifically interpreted based on their context within the context of the description of the relevant art.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Fig. 1-5 show the structure schematic diagram of the three valve sets and the valve body and valve rod for differential pressure transmitter of the present invention.

The utility model provides a three valves for differential pressure transmitter, as shown in figure 1 and figure 5, these three valves include: a valve body 100 having a first chamber and a second chamber formed therein, and having a first measuring medium interface 102 and a first transmitter interface 105 which are connected to the first chamber, and a second measuring medium interface 101 and a second transmitter interface 104 which are connected to the second chamber; a valve stem assembly 200 comprising a valve stem 201 extending into the interior of the valve body and being movable longitudinally therealong to communicate or isolate the first and second chambers. According to the utility model discloses, first measurement medium interface with the setting of second measurement medium interface is in same one side of valve body, and for the longitudinal axis of valve rod becomes transverse arrangement. That is, 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 which is transverse to the longitudinal direction of the valve rod, and on the same side of the valve body, as can be seen in particular from fig. 1, 2 and 5. According to the layout, the three valve groups are simple and compact in structure on the whole and convenient to use with the differential pressure transmitter in a matched mode.

The utility model provides an among the technical scheme, stipulated the valve rod trend simultaneously and two relative position relation (crossing or crossing promptly) and two measuring medium interfaces between the measuring medium interface arrangement position (the two is in the homonymy of valve body promptly) between the position. It will be appreciated that the above-described "longitudinal", "lateral", "side" or "side" are merely relative concepts for expressing positional relationships, and that the specified relative positional relationships are not dependent on a particular shape of the valve body itself.

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

According to an embodiment of the present invention, the first chamber may be configured as a first circular hole 300, the second chamber may be configured as a second circular hole 103, the first circular hole 300 and the second circular hole 103 are communicated with each other through the central hole 107, at least the first circular hole 300 is coaxial with the central hole 107. Preferably, the second circular hole 103 is coaxial with the first circular hole 300 and the central hole 107, which is particularly beneficial for simplifying tooling equipment and process operation during valve body machining and manufacturing.

In this respect, it is worth noting 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 sufficient to ensure that the central hole has an opening open to the first and second circular holes, respectively, which are able to communicate with each other.

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 hole 300 includes an end hole section 303 opening to the first end face of the valve body and a bottom hole section 301 connected to the central hole 107, and the valve rod 201 extends into the valve body from the first end face of the valve body and can axially move in the first circular hole 300 to close or release the opening of the central hole 107 at the bottom of the bottom hole section 301. When the opening of the central hole 107 is closed, the first chamber and the second chamber are isolated from each other, as shown in fig. 1; when the central hole 107 is released from opening, the first and second chambers are put in communication with each other, as shown in fig. 5.

In this case, the first measurement medium interface 102 and the first transmitter interface 105 communicate with the bottom hole section 301 of the first circular bore 300 at least when the central opening 107 is released. This means that, when the utility model discloses a three valves and differential pressure transmitter are used with one another, under the circumstances that first cavity and second cavity communicate each other, just also make high, low pressure measuring channel communicate each other, as shown in fig. 5.

Fig. 4 is a schematic view of a valve stem according to an embodiment of the present invention. The valve stem 201 may be a metal workpiece. As shown, the valve stem 201 includes a plug 211 adapted to fit into the central bore 107 opening to close or release the opening. According to an embodiment of the present invention, the bottom surface of the bottom hole section 301 of the first circular hole 300 is a plane, and the top 211 has a conical configuration, which is particularly advantageous for hermetically closing the opening of the central hole 107 of the bottom surface of the bottom hole section 301.

According to an embodiment of the present invention, the valve stem 201 is provided with an operating mechanism 214 at an end opposite to the plug 211, by which the valve stem can be manipulated from the outside of the valve body to achieve axial movement of the valve stem in the first circular hole.

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

In embodiments where the valve stem is threadably engaged with the first bore, the operating mechanism 214 may include a turning tool (e.g., a screwdriver or wrench) engaging structure at a corresponding end of the valve stem, such as a straight or cross-shaped slot corresponding to a screwdriver or a socket or socket-type wrench. Of course, besides manual operation, the valve rod can be operated by adopting driving modes such as electromagnetism, electromotion, pneumatics and the like, so that the axial movement of the valve rod can be automatically and accurately controlled.

Referring to fig. 3 and 4 in combination with fig. 1 and 5, the valve stem 201 includes 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 303 of the first circular hole 300 for hermetically closing the opening of the first circular hole on the first end surface of the valve body to prevent the medium from leaking. 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 sealing ring 202 is an elastic sealing ring made of fluororubber or tetrafluoro (PTFE), and its cross section is preferably circular. The utility model discloses a when three valves and differential pressure transmitter supporting use, especially to the low pressure measurement passageway, through O type sealing washer and sealed shaft section periphery and the produced radial seal effort of the 300 end hole sections 303 inner walls elasticity laminating of first round hole just enough, from this, can realize a low-cost and simple reliable radial seal at the low pressure side.

As shown in fig. 2, the first round hole 300, the center hole 107, and the second round hole 103 form a through hole that penetrates from the first end face to the second end face of the valve body. According to the valve body, the main pore passage in the valve body is designed to be of a straight-through structure, so that the valve body can be processed and manufactured by a simple process.

According to an embodiment of the present invention, the second circular hole 103 includes an end hole section opening to the second end surface of the valve body, and an end cap 401 is detachably mounted in the end hole section, as shown in fig. 1 and 5.

The plug 401 can hermetically close the opening of the second round hole 103 on the second end face of the valve body. The utility model discloses a when three valves and differential pressure transmitter supporting use, this opening can be used as the pressure release mouth of high pressure measurement passageway for example.

The end bore section of the second circular bore 103 can be designed as a threaded bore section with an internal thread, and the plug 401 can be designed as a screw plug with an external thread matching the internal thread. Preferably, a sealing gasket, in particular an elastic sealing gasket, is arranged between the plug head and the second end face of the valve body. According to this, the utility model discloses a when three valves and differential pressure transmitter are supporting to be used, especially to the high-pressure measurement passageway, can realize a low-cost and simple reliable end face seal, simultaneously, the size of axial seal effort also can be adjusted based on spiro union fastening force.

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

According to an embodiment of the invention, the first transmitter interface 105 and the second transmitter interface 104 are arranged on the opposite side of the valve body to the first measuring medium interface 102 and the second measuring medium interface 101, as shown in fig. 2. According to this, based on the utility model provides an interface overall arrangement sets up the scheme, combines the above the direct structural design of dominant pore, all pores of valve body can only extend in two directions (firstly the dominant pore lets in inside horizontal extending direction from the valve body side from the longitudinal extension direction of the first terminal surface of valve body to second terminal surface) to can take simple technology and equipment to manufacture the valve body, reduce the cost of three valves by a wide margin.

It is noted that the above-described arrangement/positional relationship of the transmitter interface and the measurement medium interface in the three-valve group is preferred, but not essential. The utility model discloses a under the frame, according to design needs, type of construction and installation condition, first changer interface 105 and second changer interface 104 also can set up in other sides of valve body, only need to ensure that first measuring medium interface 102 communicates each other, second measuring medium interface 101 communicates each other via the second cavity with first changer interface 105 via first cavity, second changer interface 104.

The utility model discloses still provide a differential pressure transmitter, especially little differential pressure transmitter, it is furnished with aforementioned three valves. As described above, the utility model discloses a three valves have simple structure, design compactness, miniaturization, dimension guarantor advantages such as convenient, are particularly useful for differential pressure transmitter.

Preferably, the first measurement medium interface 102 is used for introducing a low-pressure measurement medium, the second measurement medium interface 101 is used for introducing a high-pressure measurement medium, the first measurement medium interface 102, the first chamber, the first transmitter interface 105 form a low-pressure measurement channel of the differential pressure transmitter, and the second measurement medium interface 101, the second chamber, the second transmitter interface 104 form a high-pressure measurement channel of the differential pressure transmitter. According to this, the utility model provides a three valves design, allow when it uses with differential pressure transmitter is supporting, based on the difference of high, low pressure, rationally dispose and optimize sealing mechanism. As mentioned above, for the high-pressure measuring channel, an adjustable end-face seal suitable for high pressure can be formed between the plug (plug screw) and the end face of the valve body; in contrast, for a low-pressure measuring channel, a radial seal suitable for low pressures can be formed between the outer circumference of the shaft section and the inner wall of the bore section. Therefore, compare in prior art, the utility model discloses a differential pressure transmitter and three valves thereof still have following advantage: the sealing structure is simple, the sealing parts are few, the effect is reliable, and the maintenance cost is reduced while the leakage risk is reduced.

According to the utility model discloses, it is feasible be provided with first stop valve in first measurement medium kneck or the pressure pipeline that draws that links to each other with it the second is measured and is provided with the second stop valve in the medium kneck or the pressure pipeline that draws that links to each other with it. The stop valve is used for introducing or shutting off the measuring medium, under the framework of the utility model, the stop valve can be designed and arranged according to equipment configuration, technical requirement and installation condition in a flexible way, its concrete position and form do not make the restriction, for example can be plug valve (like spherical plug valve or cylindricality plug valve), plunger valve, butterfly valve etc..

Typically, the three-valve set of a differential pressure transmitter includes a high pressure valve, a low pressure valve, and a balancing valve. The valve rod can be actuated in such a way that it functions as a so-called balancing valve, the first stop valve being a low-pressure valve and the second stop valve being a high-pressure valve. The utility model discloses a differential pressure transmitter and working method of three valves thereof: when the balance valve starts to operate, the balance valve (the control valve rod is communicated with the high-pressure measuring channel and the low-pressure measuring channel) is opened, then the high-pressure valve and the low-pressure valve are opened (high-pressure measuring media and low-pressure measuring media are introduced), then the balance valve (the control valve rod is closed, the high-pressure measuring channel and the low-pressure measuring channel are cut off), and then the measuring operation can be executed; stopping operation: 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 closed (the high-pressure measuring medium and the low-pressure measuring medium are not connected any more), and then the measuring operation is stopped.

The above description is only a preferred embodiment of the present application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the present application is not limited to the particular combination of the above-mentioned features, but also encompasses other embodiments in which any combination of the above-mentioned features or their equivalents is possible without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (20)

1. A three-valve manifold for a differential pressure transmitter, comprising:

the valve comprises a valve body (100), a first cavity and a second cavity are formed in the valve body, and a first measuring medium interface and a first transmitter interface which are communicated with the first cavity and a second measuring medium interface and a second transmitter interface which are communicated with the second cavity are arranged on the valve body;

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 with or isolate the first chamber from the second chamber;

characterized in that the first measurement medium connection and the second measurement medium connection are arranged on the same side of the valve body and are arranged transversely with respect to the longitudinal axis of the valve stem.

2. Valve group 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 communicating with each other through a central hole (107), at least the first circular hole (300) being coaxial with the central hole.

3. Valve group according to claim 2, characterized in that the first circular hole (300) comprises an end hole section (303) opening to the first end face of the valve body and a bottom hole section (301) connected to the central hole (107), and the valve rod (201) protrudes from the first end face of the valve body into the interior of the valve body and can move axially in the first circular hole (300) to close or release the opening of the central hole (107) at the bottom of the bottom hole section (301).

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

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

6. Valve group according to claim 5, characterized in that the bottom hole section (301) of the first circular hole (300) is plane in bottom and the head (211) is of conical configuration.

7. Valve group according to claim 5, characterised 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. Valve group according to claim 3, wherein the valve stem (201) comprises a pilot shaft section (212) and the first circular hole (300) comprises a pilot hole section (302) between a port hole section and a bottom hole section, the pilot shaft section being adapted to cooperate with the pilot hole section for guiding the axial movement of the valve stem in the first circular hole.

9. 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 stem (201) is provided with an external thread matching the internal thread, whereby the axial displacement of the valve stem in the first circular bore can be achieved by screwing in or unscrewing the valve stem (201).

10. Valve manifold according to claim 3, characterized in that the valve stem (201) 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 (303) of the first round hole (300).

11. Valve group according to claim 10, characterized in that the sealing means comprise a groove (213) formed in the outer periphery of the sealing shaft section and a sealing ring (202) embedded in the groove.

12. Valve group according to any of the claims from 2 to 11, characterized in that the first (300), central (107) and second (103) circular holes form through holes passing from the first to the second end face of the valve body.

13. Valve group according to claim 12, characterised in that the second circular hole (103) comprises an end hole section open towards the second end face of the valve body, in which end hole section a plug (401) is removably mounted.

14. Valve group according to claim 13, characterised in that the plug (401) is able to sealingly close the opening of the second circular hole (103) at the second end face of the valve body.

15. Valve group according to claim 14, characterized in that the end hole section of the second circular hole (103) is configured as a threaded hole section with an internal thread, and the plug (401) is configured as a plug screw with an external thread matching the internal thread.

16. Valve group according to claim 14, characterized in that the second round hole (103) comprises a bottom hole section connected to the central hole (107), with which the second measuring medium interface and the second transmitter interface communicate.

17. Valve group according to claim 1, characterized in that the first and second transmitter interfaces are arranged on the opposite side of the valve body to the first and second measuring medium interfaces.

18. A differential pressure transmitter, characterized in that it is equipped with a three-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 configured to introduce a low pressure measurement medium and the second measurement medium interface is configured to introduce a high pressure measurement medium, the first measurement medium interface, the first chamber, the first transmitter interface forming a low pressure measurement channel of the differential pressure transmitter and the second measurement medium interface, the second chamber, the second transmitter interface forming a high pressure measurement channel of the differential pressure transmitter.

20. Differential pressure transmitter according to claim 18 or 19, characterized in that a first shut-off valve is arranged in the pressure line at or connected to the first measuring medium interface and a second shut-off valve is arranged in the pressure line at or connected to the second measuring medium interface.

Images