Design and analysis of all-metal hard sealing bidirectional zero-leakage triple eccentric butterfly valve
Aiming at the problems of the traditional triple eccentric butterfly valve to withstand a certain differential pressure or reverse pressure of full differential pressure,an all-metal hard sealing bidirectional zero-leakage triple eccentric butterfly valve is studied and designed.The valve is long-life and energy-saving,and it adopts the triple eccentric principle to solve the defect that the sealing surface of the traditional eccentric butterfly valve is still in sliding contact friction at the moment of opening 10º and closing,which realizes the effect that the sealing surface of the butterfly valve separates at the moment of opening and seals at the moment of closing contact.Firstly,the unbalanced torque and allowable differential pressure of the designed butterfly valve were analyzed theoretically,and the pressure,velocity and flow trace of the fluid in the butterfly valve chamber with different openings were analyzed through fluid flow simulation.The variation curves of the maximum pressure and maximum velocity at the inlet and outlet of butterfly valve with the valve opening were obtained.Then,the thermal temperature and resultant heat flow cloud maps of the butterfly valve were obtained through thermal stress simulation analysis,and the distribution of thermal stress,thermal strain and safety factor of the butterfly valve as well as the variation curve of its maximum thermal stress with fluid temperature were analyzed,which verified that the thermal stress of the butterfly valve met the requirements.Finally,the butterfly valve body pressure test and positive and negative high-pressure sealing test were carried out.The test results showed that there was no visible leakage and deformation of the butterfly valve body,and the measured leakage was zero,indicating that the compressive strength and sealing performance of the butterfly valve met the use requirements.The research results provide a basis for the reduction of contact and friction,the decrease of opening torque and the extension of service life of triple eccentric butterfly valves,and the proposed all-metal hard sealing structure provides a new idea for the research of bidirectional zero-leakage sealing of triple eccentric butterfly valves.
hard sealingbidirectional zero-leakagetriple eccentric butterfly valvethermal stress simulationsealing test
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