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Sinpo Valve 12 inch gate valve All the time, Sinpo Valve has been well-received in the international market. In terms of sales volume over the past years,the annual growth rate of our products has doubled thanks to the customers' recognition of our products. 'Doing a good job in every product' is the belief of our company, which is one of the reasons why we can get a large customer base. types of solenoid valve,how valves work,pressure safety valve testing procedure.