PE ball valve micro-leakage detection system and detection method

Abstract

The invention discloses a PE ball valve micro-leakage detection system. The system comprises a pressure and temperature acquisition module used for acquiring air pressure and temperature data in a valve core of a PE ball valve; a wireless signal transceiver used for receiving the data of the pressure and temperature acquisition module and forwarding the data to a host computer; and the host computer used for receiving the air pressure and temperature data forwarded by the wireless signal transceiver. The invention also provides a PE ball valve micro-leakage detection method. The method includes: the pressure and temperature acquisition module is installed in a valve core of a to-be-detected PE ball valve, the valve core of the PE ball valve is closed, and a preset air pressure value is remained in the air pressure in the valve core of the PE ball valve; the pressure and temperature acquisition module acquires detection data of the air pressure and temperature in the valve core of the PE ball valve at the same moment; and the micro-leakage condition of the PE ball valve is evaluated with the combination of the air pressure change gradient after temperature change correction according to the air pressure data change in the valve core. According to the system and the method, long-term detection of the pressure and the temperature of the valve core of the PE ball valve can be conducted, and the micro-leakage performance detection of the PE ball valve is realized.

Description

technical field [0001] The invention relates to a polyethylene (PE) ball valve micro-leakage evaluation system and method, including a micro-leakage detection principle, a detection device, and a micro-leakage evaluation criterion. Background technique [0002] PE ball valves are used in transmission pipelines for explosive and flammable fluids, and have extremely strict technical requirements for their sealing. Due to the special polyethylene molding process of PE ball valve parts, the internal density unevenness of the valve core structure (such as the valve stem of a larger ball valve) is universal, and the pressure medium may slowly escape through the gaps between the material particles, which is also caused. The main factor of ball valve micro-leakage. [0003] In the relevant valve technical standards, a method for checking the sealing performance of low-pressure and high-pressure pressure tests under gas medium conditions is proposed, and the qualitative judgment con...

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Problems solved by technology

Existing mass spectrometers can improve the resolving power of leak detection to the molecular level, but the use at the production site will be limited by cost, production line transformation, etc.

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