Adjustable valve core valve rod for balance valve

Abstract

The utility model relates to the technical field of balance valves, in particular to an adjustable valve core valve rod for a balance valve, which comprises a hand wheel main body, an inner vertical thread arranged in the hand wheel main body, a valve rod main body matched with the inner vertical thread in an inserting way, an axial limiting clamping ring, an adjustable nut, at least one sealing ring and a fixing bolt, an axial limiting clamping ring is integrally formed on the surface of the valve rod main body; the sealing ring is detachably arranged on the surface of the valve rod body in a sleeving mode and located below the axial limiting clamping ring. By additionally arranging a cooperative structure of the adjustable nut, the split type sealing ring and the axial limiting clamping ring, the effects that the sealing ring can be detached and replaced, the service life of the sealing ring can be prolonged by compensating abrasion, and additional adjusting capacity can be provided by changing the effective length of the screw rod are achieved.

Description

Technical Field

[0001] This utility model relates to the field of balancing valve technology, and more specifically to an adjustable valve core and valve stem for a balancing valve. Background Technology

[0002] In traditional balancing valve design ( Figure 2 As shown in the diagram, the core structure mainly includes a valve body, a valve core placed inside the valve body cavity, and a valve stem connected to and driving the valve core. Its working process begins with the operator rotating the handwheel. This rotational motion is converted into the axial linear motion of the valve stem through a specific transmission mechanism (usually a threaded pair). The valve stem drives the valve core, which is fixedly connected to its bottom end, to move upward or downward along the axial direction within the valve body cavity. When the valve core moves upward, a direct flow channel is gradually opened between its outer surface and the inner wall of the valve body cavity, allowing fluid to pass through; conversely, moving downward closes the flow channel, realizing the function of flow regulation or cut-off.

[0003] However, this existing design has a key limitation, particularly in the valve stem's sealing structure: the valve stem surface typically features multiple sealing rings that play a crucial sealing role. These rings are designed to be non-removably fixed or press-fitted into specific grooves within the valve stem. This fixed sealing design presents significant drawbacks: First, when the sealing rings fail due to long-term friction, aging, or accidental damage, because they cannot be individually removed and replaced from the valve stem, maintenance personnel are forced to replace the entire assembly, including the valve stem, and even other related components. This greatly increases maintenance costs and spare parts inventory pressure, and leads to longer operation times. Second, more... The fundamental flaw is that the position of the sealing ring is permanently locked after initial assembly. It is impossible to fine-tighten the preload or position of the sealing ring according to the actual operating conditions during the initial valve installation to optimize the initial sealing effect. It also lacks the ability to dynamically compensate for wear of the sealing ring during long-term valve operation. This means that as the sealing ring inevitably wears down, its sealing performance will continue to decline and cannot be restored or enhanced. It can only passively wait for eventual failure. At the same time, since the length of the valve stem is fixed, its effective working stroke cannot be extended or adjusted later according to the accumulation of system wear or changes in specific operating conditions, further limiting the adaptability of the valve. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned technical problems by providing an adjustable valve core and stem for a balance valve that enables the sealing ring to be detachable and replaceable, extends the life of the sealing ring by compensating for wear, and provides additional adjustment capability by changing the effective length of the screw.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] This utility model proposes an adjustable valve core and valve stem for a balance valve, including a handwheel body, an inner vertical groove provided inside the handwheel body, a valve stem body that is inserted and fitted with the inner vertical groove, an axial limiting retaining ring, an adjustable nut, at least one sealing ring and a fixing bolt;

[0007] An axial limiting retaining ring is integrally formed on the surface of the valve stem body;

[0008] The sealing ring is detachably fitted onto the surface of the valve stem body and is located below the axial limiting retaining ring;

[0009] The adjustable nut is threaded to the valve stem body and is pressed against the sealing ring.

[0010] The fixing bolt is installed at the top of the valve stem body and is used to axially lock the adjustable nut.

[0011] As a preferred technical solution of this utility model, the section of the valve stem body located below the axial limiting retaining ring is provided with external threads for screwing and fixing with the valve core.

[0012] As a preferred embodiment of this invention, the outer circumferential surface of the adjustable nut has a polygonal structure.

[0013] As a preferred embodiment of this utility model, at least one precision limiting hole is radially formed on the end face of the adjustable nut.

[0014] As a preferred technical solution of this utility model, at least three sealing rings are provided, and gaskets axially sleeved on the valve stem body may also be provided above, below or at the ends of adjacent sealing rings.

[0015] As a preferred technical solution of this utility model, the handwheel body has an inner rotating cover internally connected to it, and is provided with a locking block to prevent the inner rotating cover from falling off.

[0016] The beneficial effects of this utility model are as follows:

[0017] This utility model achieves the following effects by adding an adjustable nut, a split sealing ring, and an axial limiting retaining ring in a coordinated structure: it enables the sealing ring to be detachable and replaceable, extends the sealing ring's lifespan by compensating for wear, and provides additional adjustment capability by changing the effective length of the screw. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of a traditional balancing valve.

[0020] Reference numerals: 1-valve stem body, 2-axial limiting retaining ring, 3-sealing ring, 4-adjustable nut, 5-precision limiting hole, 6-fixing bolt, 7-handwheel body, 71-inner vertical groove, 72-inner rotating cover, 73-block, A-valve core. Detailed Implementation

[0021] Reference Figure 1 As shown, the present invention adopts the following technical solution to achieve the above objectives:

[0022] This utility model proposes an adjustable valve core and valve stem for a balance valve, including a handwheel body, an inner vertical groove provided inside the handwheel body, a valve stem body that is inserted and fitted with the inner vertical groove, an axial limiting retaining ring, an adjustable nut, at least one sealing ring and a fixing bolt;

[0023] An axial limiting retaining ring is integrally formed on the surface of the valve stem body;

[0024] The sealing ring is detachably fitted onto the surface of the valve stem body and is located below the axial limiting retaining ring;

[0025] The adjustable nut is threaded to the valve stem body and is pressed against the sealing ring.

[0026] The fixing bolt is installed at the top of the valve stem body and is used to axially lock the adjustable nut.

[0027] The section of the valve stem body located below the axial limiting retaining ring has external threads for screwing and fixing with the valve core.

[0028] The outer peripheral surface of the adjustable nut has a polygonal structure.

[0029] The adjustable nut has at least one precision limiting hole radially formed on its end face;

[0030] The polygonal outer surface of the adjustable nut facilitates efficient force application by tools, and the radial precision limiting hole on its end face allows the insertion of a pin to achieve micron-level displacement control (each hole corresponds to 0.1mm axial adjustment), completely avoiding the risk of over-adjustment.

[0031] The axial limiting retaining ring serves as the reference structure for the valve stem body. While ensuring the positioning accuracy of the sealing ring, it also constrains the initial connection point between the valve stem body and the valve core, ensuring that length adjustment does not affect the structural stability of the valve core.

[0032] The valve stem body is provided with at least three sealing rings, and a gasket axially fitted onto the valve stem body may be provided above, below, or at the end of adjacent sealing rings. The alternating arrangement of the three sealing rings and the metal gasket maintains uniform force during dynamic adjustment of the valve stem length, avoiding local deformation and failure.

[0033] The handwheel body is internally rotatably connected to an inner rotating cover, and is provided with a locking block to prevent the inner rotating cover from falling off.

[0034] Working principle: When the operator rotates the handwheel body, the internal vertical grooves drive the valve stem body to move axially, which in turn drives the valve core screwed at the bottom to open or close the flow channel.

[0035] The valve core and valve stem feature a dual adjustment mechanism with an adjustable nut: during initial assembly, tightening the nut applies a preset pressure to the sealing ring assembly below to form a seal; after long-term use, if the sealing ring wears, tightening the nut allows it to move downwards to compensate for the wear and restore sealing performance; when the valve core or valve seat fails to close properly due to system wear, unscrewing the nut allows the valve stem body to move downwards (effectively extending the working length of the valve stem), pushing the valve core to further press against the valve body and compensate for deep wear. After all adjustments are completed, the nut position is locked by the fixing bolt at the top of the valve stem. During disassembly and maintenance, simply loosen the bolt and unscrew the nut to directly replace the sealing ring or adjust the component layout.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An adjustable valve core and valve stem for a balancing valve, comprising a handwheel body (7), an inner vertical groove (71) disposed inside the handwheel body (7), and a valve stem body (1) inserted into and fitted with the inner vertical groove (71), characterized in that: It also includes an axial limiting retaining ring (2), an adjustable nut (4), at least one sealing ring (3) and a fixing bolt (6); An axial limiting retaining ring (2) is integrally formed on the surface of the valve stem body (1). The sealing ring (3) is detachably fitted onto the surface of the valve stem body (1) and located below the axial limiting retaining ring (2); The adjustable nut (4) is threaded to the valve stem body (1) and is pressed onto the sealing ring (3); The fixing bolt (6) is installed on the top of the valve stem body (1) for axially locking the adjustable nut (4).

2. The adjustable valve core and stem for a balancing valve according to claim 1, characterized in that: The section of the valve stem body (1) located below the axial limiting retaining ring (2) is provided with external threads for screwing and fixing with the valve core (A).

3. The adjustable valve core and stem for a balancing valve according to claim 1, characterized in that: The outer circumferential surface of the adjustable nut (4) has a polygonal structure.

4. The adjustable valve core and stem for a balancing valve according to claim 1, characterized in that: At least one precision limiting hole (5) is radially formed on the end face of the adjustable nut (4).

5. The adjustable valve core and stem for a balancing valve according to claim 1, characterized in that: At least three sealing rings (3) are provided, and gaskets (8) axially sleeved on the valve stem body (1) may also be provided above, below or at the ends of adjacent sealing rings (3).

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