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Sinpo Valve type of water valve Sinpo Valve clearly knows that inspection is a key element of quality control in the manufacturing of type of water valve. We verify product quality on-site at different stages of the production process and prior to its dispatch. With the use of inspection checklists, we standardize the quality control process and the quality problems can be delivered to each production department.valve companies in houston,mcf ball valves,what is a plug valve.