Inner piston balance type self-operated regulating valve

Abstract

The utility model discloses an inner piston balance type self-operated regulating valve which is characterized by further comprising a piston balance cylinder arranged in a valve body, the piston balance cylinder comprises a balance cylinder installed on a valve rod and connected with a sleeve in a sliding mode, and a balance piston penetrating through the valve rod is arranged in the balance cylinder. A valve core is mounted on the balance piston; a balance cavity is formed among the sleeve, the closing plate and the balance piston, and the valve rod is provided with a central pressure guide hole communicated with the balance cavity and the valve body. The piston balance cylinder is arranged in the valve body, medium pressure is automatically guided into the balance cavity to be applied to the balance piston to be mutually balanced with medium acting force acting on the valve element, the valve element is kept in a dynamic balance state all the time, and therefore the working stability is remarkably improved; deformation and even breakage damage of opening and closing pieces such as the valve element, the valve rod, the valve seat and the sleeve caused by vibration are avoided.

Description

Technical Field

[0001] The utility model relates to a self-operated regulating valve, in particular to an inner piston balanced self-operated regulating valve. Background Art

[0002] The self-operated pressure regulating valve is an energy-saving regulating valve product that does not require external energy and only uses the pressure changes of the regulated medium for automatic adjustment. It is an independent control unit that integrates detection, execution and control functions. It is suitable for automatic regulation and control of process pipeline pressures such as gas, liquid and steam.

[0003] Existing self-operated pressure regulating valves usually use bellows to achieve internal balance of the medium force acting on the valve core, and work together with the actuator to achieve the self-operated pressure regulation control function. However, the pressure difference that the bellows assembly can withstand is relatively low, generally below 0.6MPa. However, for special working conditions where the pressure fluctuation direction before and after the valve is relatively large, problems such as poor pressure control stability and low regulation accuracy often occur. For this reason, an internal piston balanced self-operated regulating valve is proposed. Utility Model Content

[0004] The utility model aims to solve the above problems and proposes an inner piston balanced self-acting regulating valve.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution: an internal piston balanced self-operated regulating valve, comprising a valve body, a valve seat installed in the valve body, a valve cover installed on the valve body and a valve stem slidably installed on the valve cover, a blind plate is installed at the bottom of the valve body, and a sleeve is installed between the blind plate and the valve seat; it is characterized in that it also includes a piston balancing cylinder arranged in the valve body, the piston balancing cylinder includes a balancing cylinder installed on the valve stem and slidably connected with the sleeve, a balancing piston is arranged in the balancing cylinder and is penetrated by the valve stem, and a valve core is installed on the balancing piston; a balancing chamber is formed between the sleeve, the blind plate and the balancing piston, and a central pressure-conducting hole connecting the balancing chamber and the valve body is provided on the valve stem.

[0006] Further preferably, a column is installed on the valve cover, a pressure plate is installed on the column, and an adjusting disk with adjustable position is installed on the pressure plate; the other end of the valve stem is movably connected with a spring seat, a spring guide sleeve is installed on the spring seat, and a spring is installed between the adjusting disk and the spring seat.

[0007] Further preferably, a bearing gasket is installed on the valve stem, and a bearing is also installed on the valve stem, and the bearing is located between the spring seat and the bearing gasket.

[0008] Further preferably, a packing is installed between the valve cover and the valve stem, and a packing pressure plate is installed on the valve cover to press the packing between the valve cover and the valve stem.

[0009] Further preferably, it also includes a bellows connected to the valve stem and the valve cover.

[0010] The beneficial effects of the utility model are as follows: by arranging a piston balancing cylinder in the valve body, the medium pressure is automatically guided to the balancing chamber, and the medium forces acting on the balancing piston and the valve core are balanced with each other, so that the valve core always maintains a dynamic balance state, thereby significantly improving the working stability and avoiding deformation or even fracture damage of the valve core, valve stem, valve seat, sleeve and other opening and closing parts due to vibration;

[0011] The setting of the sleeve plays a guiding and limiting role in the up and down movement of the piston balance cylinder, and also improves the stability of the piston balance cylinder during movement;

[0012] A central pressure-conducting hole is provided on the valve stem to guide the medium in the valve cavity into the balancing cavity and then exert the force of the medium on the balancing piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a structural schematic diagram of the utility model;

[0014] Attached Figure 2 It is a partial enlarged structural schematic diagram of point A of the utility model.

[0015] Legend: 1. Valve body; 11. Stifling plate; 2. Valve seat; 3. Valve cover; 31. Column; 32. Pressure plate; 33. Adjusting plate; 34. Spring seat; 35. Spring guide sleeve; 36. Spring; 4. Sleeve; 5. Piston balance cylinder; 51. Balance cylinder; 52. Balance piston; 53. Balance chamber; 6. Valve stem; 61. Center pressure guide hole; 62. Bearing; 63. Bearing gasket; 7. Valve core; 8. Packing; 91. Packing pressure plate; 10. Bellows. DETAILED DESCRIPTION

[0016] Next, we will further explain the inner piston balanced self-operated regulating valve described in the utility model in conjunction with the accompanying drawings.

[0017] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the utility model are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0018] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation" and the like shall be used in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium; it may be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] See also Figure 1-2 As shown in, an internal piston balanced self-operated regulating valve comprises a valve body 1, a valve seat 2 installed in the valve body 1, a valve cover 3 installed on the valve body 1 and a valve stem 6 slidably installed on the valve cover 3, a blanking plate 11 is installed at the bottom of the valve body 1, a sleeve 4 is installed between the blanking plate 11 and the valve seat 2; it is characterized in that it also includes a piston balancing cylinder 5 arranged in the valve body 1, the piston balancing cylinder 5 includes a balancing cylinder 51 installed on the valve stem 6 and slidably connected with the sleeve 4, a balancing piston 52 is arranged in the balancing cylinder 51 and penetrates the valve stem 6, and a valve core 7 is installed on the balancing piston 52; a balancing chamber 53 is formed between the sleeve 4, the blanking plate 11 and the balancing piston 52, and a central pressure guide hole 61 connecting the balancing chamber 53 and the valve body 1 is provided on the valve stem 6.

[0020] By arranging a piston balancing cylinder 5 in the valve body 1, the medium pressure is automatically guided to the balancing chamber 53, and the medium forces acting on the balancing piston 52 and the valve core 7 are balanced with each other, so that the valve core 7 always maintains a dynamic balance state, thereby significantly improving the working stability and avoiding deformation or even fracture damage of the valve core 7, valve stem 6, valve seat 2, sleeve 4 and other opening and closing parts due to vibration;

[0021] The sleeve 4 is provided to guide and limit the upward and downward movement of the piston balancing cylinder 5, and also improves the stability of the piston balancing cylinder 5 during movement.

[0022] A central pressure-conducting hole 61 is provided on the valve stem 6 to guide the medium in the valve cavity into the balancing cavity 53 and then exert the force of the medium on the balancing piston 52 .

[0023] In one embodiment, a column 31 is also installed on the valve cover 3, a pressure plate 32 is installed on the column 31, and an adjustable adjustment disk 33 is installed on the pressure plate 32; the other end of the valve stem 6 is movably connected to a spring seat 34, a spring guide sleeve 35 is installed on the spring seat 34, and a spring 36 is installed between the adjustment disk 33 and the spring seat 34; the adjustment disk 33 is installed on the pressure plate 32 by threads, and the position of the adjustment disk 33 is adjusted by rotating the adjustment disk 33, and the position of the spring 36, the spring seat 34 and the valve stem 6 is adjusted by adjusting the position of the adjustment disk 33, thereby adjusting the initial position of the adjustment valve core 7 to adjust the opening of the valve; the setting of the spring guide sleeve 35 plays a limiting and guiding role on the position of the spring 36.

[0024] In one embodiment, a bearing gasket 63 is also installed on the valve stem 6, and a bearing 62 is also installed on the valve stem 6. The bearing 62 is located between the spring seat 34 and the bearing gasket 63. Through the setting of the bearing 62, the spring seat 34 will not rotate due to the rotation of the valve stem 6 during use, and the valve stem 6 will not rotate when the spring seat 34 rotates.

[0025] In one embodiment, a packing 8 is installed between the valve cover 3 and the valve stem 6 , and a packing pressing plate 91 is installed on the valve cover 3 to press the packing 8 between the valve cover 3 and the valve stem 6 .

[0026] In one embodiment, it also includes a bellows 10 connected to the valve stem 6 and the valve cover 3. Through the setting of the bellows 10, when the medium before the valve is unstable, it can be used as a pressure balancing element to stabilize the pressure and reduce the vibration of the valve stem 6 and the valve core 7. Combined with the piston balancing cylinder 5, it further plays a role in balancing the pressure of the valve core 7 and the valve stem 6, thereby reducing the vibration of the valve stem 6 and the valve core 7 and avoiding damage to the components inside the valve due to vibration.

[0027] When the utility model is in use: after the medium in front of the valve enters the valve body 1, it enters the upper part of the valve core 7 through the hole on the sleeve 4, and forms a downward force on the valve core 7. At the same time, part of the medium flows into the balance chamber 53 through the central pressure guide hole 61 on the valve stem 6, and then acts on the balance piston 52, and then the force and the force of the medium on the valve core 7 are balanced, so that the valve core 7 is always in a dynamic balance state, thereby significantly improving the working stability and avoiding deformation or even breakage and damage of the valve stem 6, valve core 7, sleeve 4, valve seat 2 and other opening and closing parts due to vibration of the valve core 7 and valve stem 6.

[0028] The protection scope of the present utility model is not limited to the above embodiments and their variations. Conventional modifications and replacements made by those skilled in the art based on the contents of this embodiment all fall within the protection scope of the present utility model.

Claims

1. An internal piston balanced self-operated regulating valve, comprising a valve body (1), a valve seat (2) mounted in the valve body (1), a valve cover (3) mounted on the valve body (1), and a valve stem (6) slidably mounted on the valve cover (3), wherein a blind plate (11) is mounted at the bottom of the valve body (1), and a sleeve (4) is mounted between the blind plate (11) and the valve seat (2); wherein the valve body (1) is provided with a valve seat (2); wherein the valve seat (2) is provided with a valve cover (3); The valve body (1) further comprises a piston balancing cylinder (5), the piston balancing cylinder (5) comprising a balancing cylinder (51) mounted on the valve stem (6) and slidably connected to the sleeve (4), a balancing piston (52) penetrating the valve stem (6) being arranged in the balancing cylinder (51), a valve core (7) being mounted on the balancing piston (52); a balancing chamber (53) being formed between the sleeve (4), the blind plate (11) and the balancing piston (52), and a central pressure-conducting hole (61) connecting the balancing chamber (53) and the valve body (1) being arranged on the valve stem (6).

2. The internal piston balanced self-operated regulating valve according to claim 1, characterized in that: The valve cover (3) is also provided with a column (31), a pressure plate (32) is provided on the column (31), and an adjustable disk (33) is provided on the pressure plate (32); the other end of the valve stem (6) is movably connected with a spring seat (34), a spring guide sleeve (35) is provided on the spring seat (34), and a spring (36) is provided between the adjustable disk (33) and the spring seat (34).

3. The internal piston balanced self-operated regulating valve according to claim 2, characterized in that: A bearing gasket (63) is also mounted on the valve stem (6), and a bearing (62) is also mounted on the valve stem (6), wherein the bearing (62) is located between the spring seat (34) and the bearing gasket (63).

4. The internal piston balanced self-operated regulating valve according to claim 1, characterized in that: A packing (8) is also installed between the valve cover (3) and the valve stem (6), and a packing pressing plate (91) is also installed on the valve cover (3) for pressing the packing (8) between the valve cover (3) and the valve stem (6).

5. The internal piston balanced self-operated regulating valve according to claim 1, characterized in that: It also includes a bellows (10) connected to the valve stem (6) and the valve cover (3).

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