A forged bellow seal valve is gate or globe valve that uses a cylindrical metal bellows to seal the valve against stem leakage. Bellow is similar to a hollow flexible hose. It functions like a vertical diaphragm. It seals with the valve stem at one end, and seals with the valve body at the other end. Therefore, forged bellow seal valves allow a small relative move between valve stem and body, but prevent fluids from leaking across bellow surface. The move pushes seat or stem tip for valve to close or open.
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