Pneumatic valve positioner for pneumatic diaphragm control valve and positioning method

A pneumatic membrane and pneumatic valve technology, applied in the direction of diaphragm valves, diaphragms, valve devices, etc., can solve the problems affecting the flow control accuracy, inaccurate valve stem positioning, etc., and achieve the effect of good flow control

Inactive Publication Date: 2017-05-10
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the positioning of the valve stem is inaccurate due to the large friction between the valve stem and the packing during the use of the pneumatic membrane regulating valve, thereby affecting the flow control accuracy, the present invention provides a pneumatic membrane regulating valve. Pneumatic valve positioner and positioning method

Method used

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  • Pneumatic valve positioner for pneumatic diaphragm control valve and positioning method

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Experimental program
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specific Embodiment approach 1

[0018] Specific implementation mode one: combined with figure 1 Describe this embodiment, a pneumatic valve positioner for a pneumatic film regulating valve described in this embodiment, which includes a pneumatic converter 1, a lever 2, a range spring 3, a feedback cam fulcrum 4, a feedback cam 5, a swing rod 6. Swing rod fulcrum 7, feedback lever 8, roller 9, feedback spring 10, adjustment spring 11, baffle plate 12, nozzle 13, lever fulcrum 14, air pressure amplifier 15, pneumatic film regulating valve 16, film air chamber 16-1 , valve stem 16-2.

specific Embodiment approach 2

[0019] Specific implementation mode two: combined with attached figure 1 Describe this embodiment. The difference between this embodiment and the first embodiment is that the output end of the air pressure converter 1 described in this embodiment is connected to the left side of the upper end of the lever 2, and the lever 2 The right side of the upper end is connected with one end of the range spring 3, the other end of the range spring 3 is fixed, the lever 2 is hinged on the lever fulcrum 14, and the lower end of the lever 2 is right The side is connected with one end of the feedback spring 10 and one end of the adjustment spring 11 sequentially from top to bottom, the other end of the adjustment spring 11 is fixed, and the left side of the lower end of the lever 2 is installed Described baffle plate 12, there is a certain gap between the described baffle plate 12 and the described nozzle 13, the back pressure output end of the described nozzle 13 is connected with the air p...

specific Embodiment approach 3

[0020] Specific implementation mode three: combined with attached figure 1 This embodiment is described. The difference between this embodiment and the first or second embodiment is that the air pressure converter 1 described in this embodiment is a bellows. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a pneumatic valve positioner for a pneumatic diaphragm control valve and a positioning method, and belongs to the field of control valves and valve positioners. The problem that according to the pneumatic diaphragm control valve, a valve rod is positioned inaccurately due to the fact that friction force between the valve rod and filler is large is solved. The pneumatic valve positioner is composed of an air pressure transducer, a lever, a range spring, a feedback cam pivot, a feedback cam, an oscillating bar, an oscillating bar pivot, a feedback rod, a rolling wheel, a feedback spring, a regulating spring, a baffle, a nozzle, a lever pivot, a barometric amplifier, the pneumatic diaphragm control valve, a diaphragm air chamber and a valve rod. The positioning method comprises the steps that 1, air pressure is connected to the air pressure transducer; 2, the positioner is regulated by means of the moment balance principle; 3, the valve rod is positioned at the fixed position. Accurate positioning is achieved between an input air pressure signal and displacement of the valve rod of the pneumatic diaphragm control valve can be achieved.

Description

technical field [0001] The invention belongs to the field of regulating valves and valve positioners, and in particular relates to a pneumatic valve positioner and a positioning method for a pneumatic film regulating valve. Background technique [0002] Pneumatic film regulating valve is the most commonly used flow regulating valve at present. It is mainly composed of valve body, valve stem, spring, packing, valve core and valve seat. Because of its simple structure and low price, it has been widely used in industrial production. widely used. When working, the air pressure signal is introduced from the upper part and acts on the membrane to generate a downward thrust. When the reaction force of the spring is overcome, the valve stem is pushed to generate displacement, thereby changing the flow area between the valve core and the valve seat to achieve control. purpose of traffic. In order to prevent leakage at the outlet of the valve stem, the packing is always pressed tigh...

Claims

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Application Information

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IPC IPC(8): F16K7/16F16K7/17
CPCF16K7/16F16K7/17
Inventor 石德全鲁德才高桂丽
Owner HARBIN UNIV OF SCI & TECH
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