I. INTRODUCTION The function of one-way valve is to allow oil under a certain pressure (opening pressure) to flow in one direction when the one-way valve is opened and the reverse direction oil can not pass through the valve and the valve is closed at this time. Check valve is divided into two types of tube plate. According to the structure can be divided into two types of ball valve and cone valve. Second, the failure principle (A) serious internal leakage When the valve core wear and tear, heart or dirt stuck, will result in valve leakage. Costs training course (B) can not afford the role of one-way valve can not afford the so-called one-way valve is the role of the reverse oil can pass through the one-way valve. Third, the external leakage â‘ tube one-way valve threaded connection, due to poor thread fitting or threaded joint is not tightened; â‘¡ plate valve leakage occurs mainly in the installation surface and the thread plug; â‘¢ body with porous trachoma.
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