Product Overview: Forged Steel Flanged Gate Valves

Forged steel flanged gate valves-also known simply as forged steel gate valves-feature a valve body manufactured via a single-piece forging process. Their history dates back to 1952, when the Jinlong Hardware Factory (later merged into the Shanghai Valve Factory) successfully produced the first medium-pressure forged steel gate valve.
These valves are primarily designed to open and close the flow of high-temperature, high-pressure media. They are suitable for a wide range of fluids, including water, steam, oil, nitric acid, acetic acid, oxidizing media, and urea.
Forged steel gate valves are characterized by their high-pressure resistance and excellent sealing capabilities; they withstand high temperatures and pressures better than standard gate valves. Their unique self-sealing design ensures that the seal becomes more reliable as the internal pressure increases. They are mainly used in piping systems within thermal power plants to isolate or connect the flow of media. Typical operating temperature ranges are -40°C to 600°C or -200°C to 650°C; pressure ratings range from 150LB to 2500LB (or PN10–32 MPa / ANSI 150–4500LB); and sizes range from 3/8" to 2" (or DN10–50). Common connection methods include flanged, butt-weld, socket-weld, and threaded connections.
Based on the bonnet design, forged steel gate valves are categorized into three main types: bolted bonnet (body and bonnet connected by bolts and nuts, sealed with a spiral-wound gasket), welded bonnet (body and bonnet connected by threads, fully welded seal), and pressure-seal bonnet (body and bonnet connected by threads, sealed with an internal pressure-actuated self-sealing ring).