Pressure balanced control valve

Abstract

The utility model provides a pressure balance formula governing valve, its characterized in being including valve cover, valve seat, valve core, valve rod and valve cage, the valve cover is connected with valve seat through fixing piece, the valve rod is set up in the middle part of valve cover and passes through, the valve rod bottom connects valve core, the valve core outside side is contacted with valve cage through sealing assembly, the valve cage is installed in the inside of valve seat, a plurality of balance holes are arranged in the inside of valve core, the utility model avoids the scouring of high pressure difference to the valve inner part, increases valve service life and stability, makes the field noise reduce to the safe range.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a pressure-balanced regulating valve. Background Technology

[0002] In fluid systems, control valves are used to control the pressure, temperature, and flow rate of fluids. As the scale of domestic equipment continues to increase, the requirements for valve control are also becoming more stringent. For gas and steam conditions, the pressure difference is relatively large, which increases the noise inside the valve, causes severe vibration, and leads to fluctuations in outlet pressure. Consequently, the regulating performance is reduced, and the actual service life of the valve is greatly reduced due to the high noise and high flow rate caused by the high pressure difference.

[0003] like Figure 1 The diagram shows the current valve core structure of a control valve. The valve core of this control valve is not treated in any way. When the medium enters from the bottom of the control valve and flows out from the side while the valve core and valve seat are in the closed state, the medium exerts an upward thrust P1 on the valve core, which is opposite in direction and different in magnitude from the downward thrust of the actuator. Therefore, the unbalanced force at this point is relatively large, and the medium is prone to leak from the contact point A between the valve core and the valve seat. Utility Model Content

[0004] In view of the above technical problems, this utility model provides a pressure-balanced regulating valve that avoids the erosion of valve internals by high pressure differential, and increases the service life and stability of the valve.

[0005] This utility model provides a pressure-balanced regulating valve, characterized in that it includes a valve cover, a valve seat, a valve core, a valve stem, and a valve cage. The valve cover is connected to the valve seat by a fixing component. The valve stem is disposed through the middle of the valve cover. The bottom of the valve stem is connected to the valve core. The outer side of the valve core is in contact with the valve cage through a sealing component. The valve cage is installed inside the valve seat. The valve core is provided with multiple balancing holes.

[0006] The sealing assembly includes a fixed ring, a metal support ring, a sealing ring, and an anti-extrusion ring. The fixed ring is connected to the upper part of the outer wall of the valve core, the metal support ring is connected to the lower part of the fixed ring, the sealing ring is provided at the lower part of the metal support ring, the metal support ring and the sealing ring are spaced apart by a distance, the anti-extrusion ring is connected to the bottom of the sealing ring, and the anti-extrusion ring is connected to the lower part of the outer wall of the valve core.

[0007] The sealing assembly includes a fixing ring, a metal support ring, a sealing ring, and an anti-extrusion ring. The fixing ring is connected to the upper part of the outer wall of the valve core. The bottom of the fixing ring is connected to the metal support ring. The bottom of the metal support ring is connected to the anti-extrusion ring. The bottom of the anti-extrusion ring is connected to the sealing ring.

[0008] The fastener is a bolt.

[0009] The beneficial effects of this utility model are as follows: This utility model is a pressure-balanced regulating valve. The regulating valve has a hole drilled inside the valve core. When the medium enters from the bottom and flows out from the side, and the regulating valve is in the closed state, the medium flows into the cavity in the upper part of the valve body through the balance hole of the valve core. At this time, the medium exerts an upward thrust on the valve core, and also a downward thrust P2, thereby reducing the impact force of the medium on the actuator, and thus reducing the thrust of the actuator on the valve stem and valve core, extending the service life of the actuator. Simultaneously, a sealing assembly is added to the outside of the valve core. This sealing assembly has two connection methods: when the medium enters from the side and exits from the bottom, such as... Figure 4 As shown, this causes the sealing ring opening to widen, squeezing the anti-extrusion ring downwards. When the medium exits from the bottom inlet side, as... Figure 5 As shown, the sealing ring opens wider and presses upward against the anti-extrusion ring. Both of these causes the anti-extrusion ring to expand, thereby reducing the gap between the valve core and the valve cage in the sealing ring area and reducing media leakage. In addition, the valve core seal currently uses a spring-loaded PTFE sealing ring, whose temperature limit is around 232°C. It is equipped with this anti-extrusion ring, which is made of PEEK (polyether ether ketone), and its temperature limit can reach 316°C. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the current valve core structure; Figure 2 This is a schematic diagram of the valve core structure of this utility model; Figure 3 This is a schematic diagram of the connection structure between the valve core and the sealing assembly of this utility model; Figure 4 This is a schematic diagram of the connection structure between the valve core and the sealing assembly of this utility model; Figure 5 This is a schematic diagram of the structure of this utility model.

[0011] Reference numerals: 1-valve core; 2-valve stem; 3-valve seat; 4-valve cage; 11-balance hole; 5-sealing assembly; 6-valve cover; 7-bolt; 51-retaining ring; 52-metal support ring; 53-sealing ring; 54-anti-extrusion ring. Detailed Implementation

[0012] Example 1

[0013] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings.

[0014] like Figure 1As shown, this utility model provides a pressure-balanced regulating valve, characterized by including a valve cover 6, a valve seat 3, a valve core 1, a valve stem 2, and a valve cage 4. The valve cover 6 is connected to the valve seat 3 by a fixing component. The valve stem 2 is disposed through the middle of the valve cover 6. The bottom of the valve stem 2 is connected to the valve core 1. The outer side of the valve core 1 is in contact with the valve cage 4 through a sealing component 5. The valve cage 4 is installed inside the valve seat 3. Multiple balance holes 11 are provided inside the valve core 1.

[0015] The sealing assembly 5 includes a retaining ring 51, a metal support ring 52, a sealing ring 53, and an anti-extrusion ring 54. The retaining ring 51 is connected to the upper part of the outer wall of the valve core 1, the metal support ring 52 is connected to the lower part of the retaining ring 51, the sealing ring 53 is provided at the lower part of the metal support ring 52, and there is a distance between the metal support ring 52 and the sealing ring 53. The bottom of the sealing ring 53 is connected to the anti-extrusion ring 54, which is connected to the lower part of the outer wall of the valve core 1.

[0016] The sealing assembly includes a retaining ring 51, a metal support ring 52, a sealing ring 53, and an anti-extrusion ring 54. The retaining ring 51 is connected to the upper part of the outer wall of the valve core 1. The bottom of the retaining ring 51 is connected to the metal support ring 52. The bottom of the metal support ring 52 is connected to the anti-extrusion ring 54. The bottom of the anti-extrusion ring 54 is connected to the sealing ring 53.

[0017] The fastener is bolt 7.

[0018] Example 2

[0019] When using this utility model: When the medium enters from the bottom and exits from the side while the regulating valve is closed, the medium flows from the balance hole 11 of the valve core 1 into the cavity at the top of the valve body. At this time, the medium exerts an upward thrust on the valve core 1, while also exerting a downward thrust P2, thereby reducing the impact force of the medium on the actuator, and consequently reducing the thrust of the actuator on the valve stem 2 and the valve core 1, extending the service life of the actuator. Simultaneously, a sealing assembly 5 is added to the outside of the valve core 1. This sealing assembly 5 has two connection methods; when the medium enters from the side and exits from the bottom, it uses... Figure 4 The connection method shown enlarges the opening of the sealing ring 53, pressing the anti-extrusion ring downwards. When the medium exits from the bottom inlet side, it uses... Figure 5 In the connection shown, the sealing ring 53 is opened wide, pressing the anti-extrusion ring 54 upward. Both of these cause the anti-extrusion ring 54 to expand, thereby reducing the gap between the valve core and the valve cage in the sealing ring area.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pressure-balanced regulating valve, characterized in that... The valve includes a valve cover, a valve seat, a valve core, a valve stem, and a valve cage. The valve cover is connected to the valve seat by a fixing component. The valve stem is disposed through the middle of the valve cover. The bottom of the valve stem is connected to the valve core. The outer side of the valve core contacts the valve cage through a sealing component. The valve cage is installed inside the valve seat. The valve core has multiple balance holes inside.

2. The pressure-balanced regulating valve according to claim 1, characterized in that... The sealing assembly includes a fixed ring, a metal support ring, a sealing ring, and an anti-extrusion ring. The fixed ring is connected to the upper part of the outer wall of the valve core, the metal support ring is connected to the lower part of the fixed ring, the sealing ring is provided at the lower part of the metal support ring, the metal support ring and the sealing ring are spaced apart by a distance, the anti-extrusion ring is connected to the bottom of the sealing ring, and the anti-extrusion ring is connected to the lower part of the outer wall of the valve core.

3. A pressure-balanced regulating valve according to claim 1, characterized in that... The sealing assembly includes a fixing ring, a metal support ring, a sealing ring, and an anti-extrusion ring. The fixing ring is connected to the upper part of the outer wall of the valve core. The bottom of the fixing ring is connected to the metal support ring. The bottom of the metal support ring is connected to the anti-extrusion ring. The bottom of the anti-extrusion ring is connected to the sealing ring.

4. A pressure-balanced regulating valve according to claim 1, characterized in that... The fastener is a bolt.

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