Profile: Hebei Disai Valve Co., Ltd. produces butterfly valve series products. We are an ISO 9001 certified company. Our double offset butterfly valve features a cost-effective, lightweight design ideal for handling medium drinking water, water, and sewage. The eccentric principle is that the stem shaft is both deviated from the valve body center,also deviated from the seat. The double eccentricity effect allows the butterfly plate to quickly detach from the valve seat when the valve is opened, greatly eliminates unnecessary excessive.