A valve stem protection structure for a pneumatic control valve

Abstract

The utility model belongs to the petroleum chemical industry field adjusting equipment technical field, specifically disclose a kind of pneumatic regulating valve stem protection structure, including corrosion -resistant valve stem, corrosion -resistant valve stem is equipped with protective sleeve, the upper end of protective sleeve is equipped with upper tie, the lower end of protective sleeve is equipped with lower rolling band;In the corrosion -resistant valve stem of regulating valve by bolt fixed 304 stainless steel rolling band, the rubber protective sleeve is tied on corrosion -resistant valve stem, when regulating valve participates loop regulation, effectively reduce dust and gas enrichment under special working conditions, reduce valve stem jam, improve valve stem service life.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the petroleum chemical industry field adjusting equipment technical field, concretely relates to a kind of pneumatic regulating valve stem protection structure. BACKGROUND

[0002] Regulating valve is indispensable in regulating system in the field of petroleum chemical production, and it is an important link of industrial automation system. Before the action of pneumatic valve, the position of valve stem collected by valve positioner is recorded as original state. When intelligent positioner receives control signal of DCS system, the difference between the position of valve stem of control signal and original state is regarded as final control signal, which causes the contraction and expansion of diaphragm of membrane chamber of diaphragm regulating valve, the gas pressure of membrane chamber is converted into thrust of valve stem movement by diaphragm, and corresponding displacement is generated by the up-and-down movement of valve core driven by valve stem, so as to realize the regulation of medium flow, pressure, temperature and liquid level. Since regulating valve has simple structure, it is often not paid attention to. In the process pipeline of synthetic hydrochloric acid and other special working conditions, the regulating valve in key position is put into interlock, and when valve stem is in synthetic acid and alkali place for a long time, the valve stem is corroded inside and outside, and the dust outside is enriched to cause the jam of regulating valve, which affects the normal regulation of whole control loop, thereby causing the trip, and the big safety accident is easily caused after jamming without timely disposal. SUMMARY

[0003] The utility model aims at providing a kind of pneumatic regulating valve stem protection structure, for protecting regulating valve stem, installing on the upper surface of valve stem, preventing the influence of external dust and other impurities enrichment on valve stem movement, and improving the service life of valve stem.

[0004] In order to realize the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0005] A kind of pneumatic regulating valve stem protection structure, including corrosion-resistant valve stem, the corrosion-resistant valve stem is equipped with protective sleeve, the upper end of the protective sleeve is equipped with upper tie, and the lower end of the protective sleeve is equipped with lower rolling band.

[0006] Preferably, the protective sleeve is made of rubber material.

[0007] Preferably, the upper tie and the lower rolling band are made of 304 stainless steel material.

[0008] Preferably, the upper tie and the lower rolling band are fixed by bolts.

[0009] The utility model has the beneficial effects that:

[0010] In the corrosion-resistant valve stem of regulating valve, the 304 stainless steel rolling band fixed by bolt is used to tie the rubber protective sleeve on the corrosion-resistant valve stem, which effectively reduces the dust and gas enrichment under special working conditions when regulating valve participates in loop regulation, reduces the jam of valve stem, and improves the service life of valve stem. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The utility model discloses a mechanism schematic view;

[0012] 1. Corrosion -resistant valve stem, 2. upper band, 3. protective sleeve, 4. lower band. DETAILED DESCRIPTION

[0013] The utility model will be further described below in connection with the drawings and specific embodiments:

[0014] As Figure 1 The utility model discloses a kind of pneumatic regulating valve stem protection structures, including corrosion -resistant valve stem 1, corrosion -resistant valve stem 1 is equipped with protective sleeve 3, the upper end of protective sleeve 3 is equipped with upper band 2, the lower end of protective sleeve 3 is equipped with lower band 4.Corrosion -resistant valve stem 1 is effectively isolated inside and outside by protective sleeve 3 of rubber material, and outside dust enrichment causes regulating valve jam, influence the normal adjustment of entire control loop.Rubber material can effectively isolate corrosion -resistant valve stem 1 inside and outside and outside dust enrichment causes regulating valve jam, influence the normal adjustment of entire control loop.Upper band 2 and lower band 4 are 304 stainless steel material, and last long, corrosion -resistant.Upper band 2 and lower band 4 are bolted, and protective sleeve 3 can be reused when replacing.

[0015] When using, install rubber protective sleeve 3 on the position of corrosion -resistant valve stem 1, and use 304 stainless steel upper band 2 and lower band 4 to tie up upper and lower.When regulating valve is involved in control loop adjustment, protect regulating valve stem, effectively reduce dust and gas enrichment under special working condition, reduce valve stem jam.At the same time, select better material valve stem, regular maintenance personnel carry out regulating valve stem inspection and maintenance, improve valve stem service life by double protection.

Claims

1. A pneumatic control valve stem protection structure comprising a corrosion resistant valve stem, characterized by: The corrosion-resistant valve rod (1) is provided with a protective sleeve (3), the upper end of the protective sleeve (3) is provided with an upper tie (2), and the lower end of the protective sleeve (3) is provided with a lower tie (4); the protective sleeve (3) is made of rubber material; the upper tie (2) and the lower tie (4) are made of 304 stainless steel material; and the upper tie (2) and the lower tie (4) are fixed by bolts.

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