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Design method of pilot balance cage type regulating valve

A design method and technology for regulating valves, applied in the direction of valve lifts, valve details, valve devices, etc., can solve problems such as poor versatility, and achieve the effect of smooth changes and high adjustment accuracy

Active Publication Date: 2021-06-25
ZHEJIANG LINUO FLOW CONTROL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the shortcoming of poor versatility in size design of the pilot balance cage control valve in the prior art, and provides a design method for calculating and designing the internal parts of the pilot balance cage control valve, so that the size is universal

Method used

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  • Design method of pilot balance cage type regulating valve
  • Design method of pilot balance cage type regulating valve
  • Design method of pilot balance cage type regulating valve

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Experimental program
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Effect test

Embodiment 1

[0135] A design method for a pilot balanced cage regulating valve, the pilot balanced cage regulating valve includes a valve body 15, a valve seat 14, a large valve core 12, a small valve core 11, a valve cage 13, a spring 16, a pressure plate, a valve stem, an upper valve The cover and the sealing ring are characterized by comprising the following steps:

[0136] A. According to the structure of the small valve seat 111, calculate the relationship between the height of the flow channel and the stroke of the small valve core, and calculate the flow rate of the valve core at different openings and the flow area under the corresponding openings;

[0137] B. Calculate the opening cross-sectional area and annular gap area of ​​the small valve seat 111 according to the data obtained in step A, and further calculate the flow rate of the small valve seat 111 and the annular gap flow rate of the large valve core so that the outflow flow rate of the small valve seat 111 is not less than...

Embodiment 2

[0145] A design method for a pilot balanced cage regulating valve, the pilot balanced cage regulating valve includes a valve body 15, a valve seat 14, a large valve core 12, a small valve core 11, a valve cage 13, a spring 16, a pressure plate, a valve stem, an upper valve The cover and the sealing ring are characterized by comprising the following steps:

[0146] A. Calculation of small spool 11 stroke and runner height, see figure 2 : small spool 11 stroke and flow channel Explanation of symbols:

[0147] H0—small spool stroke, mm H1—small spool flow path height, mm

[0148] d0—the diameter of the upper cover of the small valve core, mm d3—the diameter of the lower end of the small valve core, mm

[0149] d1—small valve seat diameter, mm

[0150] Calculation formula:

[0151]

[0152]

[0153] CB=CE+AD AB=H 0 -0.5-AD

[0154]

[0155] Simplified calculation:

[0156] According to the valve structure design: d 0 = d 1 +2

[0157] The stroke of small spool ...

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Abstract

The invention relates to the field of industrial valve design, and discloses a design method of a pilot balance cage type regulating valve. The pilot balance cage type regulating valve comprises a valve body, a valve seat, a large valve element, a small valve element, a valve cage, a spring, a pressing plate, a valve rod, an upper valve deck and a sealing ring. The method comprises the steps of calculating to obtain the flow of the valve element under different opening degrees and the flow area under the corresponding opening degrees; calculating to obtain the maximum thrust of the small valve element, the minimum thrust required by the small valve element, the maximum lifting force required by the large valve element, the maximum sealing force required by the large valve element and the dynamic thrust of the large valve element; and by changing a diameter d1 value of the small valve seat, enabling the sealing force of the small valve element, the lifting force of the large valve element, the sealing force of the large valve element and the dynamic thrust of the large valve element to tend to be close through comparison, and obtaining a valve seat design structure with the minimum thrust of an actuator. The regulating valve provided by the invention can be widely applied to high-temperature, high-pressure and large-diameter working conditions, the leakage level of the regulating valve can be ensured to reach the V level or the VI level, and the technological requirement for tight regulation and turn-off is met.

Description

technical field [0001] The invention relates to the field of industrial valve design, in particular to a method for designing a pilot balance cage regulating valve. Background technique [0002] The pilot-operated cage control valve is an improved pressure-balanced control valve. Compared with the ordinary cage-type control valve, it has a separate pressure-balanced pilot spool, which can realize small opening adjustment. The valve has good sealing effect and strong cut-off ability, and is suitable for controlling various high-temperature and high-pressure fluids, and can be used as a vent cut-off valve. [0003] At present, in petroleum, petrochemical, power plant, pharmaceutical, new energy, coal chemical industry, fine chemical industry and other industries, high temperature, high pressure, high pressure difference, large diameter, tight shut-off working conditions are more and more widely used. For the demanding requirements of nominal diameter DN80~DN1200, pressure lev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K1/00F16K39/02F16K47/08G06F17/10
CPCF16K1/00F16K39/024F16K47/08G06F17/10
Inventor 廖卿丁远茂宋虬陈雷余成达余朝中杨世岐陈晓宇张朝
Owner ZHEJIANG LINUO FLOW CONTROL TECH
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