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Self-operated pressure range switching device

A range-switching, self-operated technology, applied to measuring devices, valve devices, measuring fluid pressure, etc., can solve problems such as complex structures, achieve the effects of simple and convenient pipelines, reduce maintenance costs, and improve service life

Active Publication Date: 2013-02-13
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the device adopts a purely mechanical structure, it can be adapted to places without access to electricity or frequent power outages, but due to the need to distribute the separated related facilities in the pipeline system, the structure is complicated

Method used

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  • Self-operated pressure range switching device

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Effect test

Embodiment 1

[0014] This embodiment is a self-operated pressure range switching device used for back-purging in industries such as metallurgy, thermoelectricity, and chemical industry. Its structure is as follows: figure 1 As shown, the valve body 2 has a measured pressure passage 12 communicating with the measured pressure pipe through the measuring pipe joint 11, and a high and low pressure measuring passage 9 communicating with the high and low pressure gauge heads through the high and low pressure side joints 8 and 16 respectively. , 14, the high and low pressure side joints 8, 16 are respectively located on the same horizontal line on both sides of the valve body 2, perpendicular to the measuring pipe joint 11.

[0015] The valve body 2 and the valve core 19 form a moving pair coaxial with the measured pressure channel 12; the end away from the measured pressure channel 12 is against the spring 3, and the end of the spring away from the valve core is against the screwed on On the set ...

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Abstract

The invention relates to a self-operated pressure range switching device, and belongs to the technical field of pipeline pressure detection. A valve body of the device is provided with a pressure-to-be-detected channel and high and low pressure measuring channels; a valve plug is provided with first and second limiting positions; first and second chutes on the valve plug are respectively connected with first and second on / off control elements through first and second connecting rods; when high pressure gas is introduced, the valve plug is positioned at the first limiting position, the first on / off control element switches on the high pressure measuring channel, and the second on / off control element disconnects the low pressure measuring channel; and when low pressure gas is introduced, the valve plug is positioned at the second limiting position, the first on / off control element disconnects the high pressure measuring channel, and the second on / off control element switches on the low pressure measuring channel. The self-operated pressure range switching device can automatically switch pressure ranges, so that sudden high pressure is prevented from damaging a low range pressure gage, the service life of the pressure gage is prolonged, the maintenance cost is reduced, and the self-operated pressure range switching device has a compact structure and concise pipelines.

Description

technical field [0001] The invention relates to an automatic gas pressure range switching device, in particular to a self-operated pressure range switching device, which belongs to the technical field of pipeline pressure detection. Background technique [0002] In many occasions, sometimes there are obvious differences in the gas delivery pressure of the same gas delivery pipeline in different periods. For example, back purge: under normal working conditions, the pressure is usually small, and a low-range pressure gauge is generally sufficient; but when the system fails or the system is stopped or put into operation, it needs several times or even dozens of times the normal working condition pressure The high-pressure inert gas or compressed air is used to back-purge the pipeline to remove toxic, harmful or flammable and explosive gases in the pipeline. The high pressure at this time can easily damage the original low-range pressure gauge. If a pressure gauge with a large...

Claims

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Application Information

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IPC IPC(8): F16K11/065F16K31/122G01L19/06
Inventor 陆洪波成涛王蓉婷
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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