Device and method for calibrating and setting airlock valve in three-break self-locking protection

A technology of air lock valve and lock valve, which is applied in the direction of measuring devices, mechanical equipment, mechanical valve testing, etc., and can solve the problems of three-break self-locking failure, large deviation and tightness, etc.

CN111811755APending Publication Date: 2020-10-23GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-10-23

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Abstract

The invention discloses a device and a method for calibrating and setting an airlock valve in three-break self-locking protection, and belongs to the field of automatic instrument measurement. The device comprises a calibration gas source, a two-way valve, a bushing, a three-way pneumatic quick connector, a filter pressure reducing valve, pressure gauges, a two-way pneumatic quick connector, an airlock valve, a three-way valve and an emptying box which are connected through pipelines, wherein the calibration gas source is connected with the two-way pneumatic quick connector and the three-way pneumatic quick connector through main pipelines; the three-way pneumatic quick connector is connected with two branch pipelines, the two branch pipelines are respectively and sequentially provided with the filter pressure reducing valve and the pressure gauge a, the output ends of the two branch pipelines are respectively connected to the airlock valve, and the outlet end of the airlock valve is connected with the pressure gauge b and the emptying box through pipelines and the three-way valve. The device solves the technical problem of three-break self-locking failure caused by large deviationor poor sealing performance between the pressure value of the switching point of the airlock valve and a theoretical pressure switching value, improves the reliability of three-break self-locking, ensures the stable operation of an adjusting system, and is convenient to popularize and use.
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Description

technical field

[0001] The invention relates to the field of automatic instrument measurement, in particular to a device and method for calibrating and setting an air-lock valve in three-break self-locking protection, and in particular to an air-lock valve switching suitable for a three-break self-locking device of a pneumatic long-stroke actuator A device and method for accurately setting point pressure values. Background technique

[0002] Pneumatic actuators are widely used in metallurgy, electric power, petroleum, chemical and other industries. It is an important terminal execution instrument in the process control system. It has a great influence on the adjustment quality of the control system and its safe and stable operation. The pneumatic actuator has the advantages of simple structure, convenient installation, reliable action, easy operation and small maintenance. In addition, even if the pneumatic actuator leaks, it will not pollute the environment. It has good ad...

Examples

Embodiment 1

[0046] Such as figure 1 As shown, cut off the gas source with the two-way ball valve 2 on the main pipeline, use the conversion bushing 3 to convert the pipeline into a G1 / 4 interface, and fix the pipeline on the calibration table with a U-shaped fixing card. Use the PB8-02 / T type three-way positive thread pneumatic quick connector to convert the gas path into two paths, and the two paths are respectively connected with the PL8-02 / L type pneumatic quick-plug external thread elbow, and one of the outputs is connected to the filter pressure reducing valve. Connection, the output end of the filter pressure reducing valve is connected with the PB8-02 / T-type three-way positive thread pneumatic quick joint, and one port of the T-type three-way is connected with the precision pressure gauge of YB-150A through the conversion bushing through the two-way ball valve. The precision pressure gauge is mainly used to detect whether there is pressure in the gas circuit. The other output end o...