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Hebei Diefei Valve Co., Ltd is a specialized factory, which gathering the medium and lower pressure valve developing, manufacturing and selling together. We are one member of Chinese Valve Association, an advanced enterprise of the Valve Industry in Hebei Province&important producer in China. And we own the rights of the importing and exporting. We established Crane Ningjin Valve Co., Ltd with Crane Valve USA in 1995. Our main products are Wafer Type Butterfly Valve, Lug Type Butterfly Valve, Screw End Butterfly Valve , Flange Type Butterfly Valve, Wafer Type Check Valve, Gate Valve and Globe Valve. All the products are exported to USA, Europe, South Africa and South-East Asia, Taiwan etc, countries and areas. In year of 2001, we got the ISO 9001 certificate and CE approved certificate. We would like to outstanding product quality and service, dedicated service at home and abroad. No, we w will introduce butterfly valves as an example. A butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disc. Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support is required. The disc is positioned in the center of the pipe; passing through the disc is a rod connected to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, so a drop is always induced in the flow, regardless of valve position. A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow. This product is suitable for throttling or shutting off the flow of corrosive or incorrosive gases, liquids, semiliquids and solid powder, and can be installed in and selected position in pipelines or on vassels in the industries of petroleum processing, chemicals, food, medicine, textile, paper making, hydroelectricity engineering, ship building, water supply and sewage, metallurgy, energy engineering as well as light industry, etc. Material: The body material: GG25/GGG40/GGG50/SS316/SS304 The disc material :DI/SS316/SS304/AL-BZ The stem material:SS410/SS416/SS420/SS304/SS316 The seat material:NBR/EPDM/PTFE/VITON Design Standard:API 609/ISO 5752/BS5155 Flange Standard: ANSI 125#/150#; JIS5K/10K/16K; DIN 2501 PN6/PN10/PN16/; BS4504 PN10/PN16 Features: 1. Small in size and light in weight, easy installation and maintenance. It can be mounted wherever needed. 2. Simple and compact construction, 3. Minimized operating torque, energy saving. 4. Flow block is small. Excellent regulation performance. 5. Wide selection of materials, applicable for various medium.