Parallel Double-Disc Gate Valve

Parallel double-disc gate valves use two parallel circular discs with a spreading mechanism. Line pressure and a spreader wedge press the discs against the seats, giving reliable bidirectional sealing without jamming from thermal distortion — a construction suited to high-temperature, high-pressure steam systems. Disc and seat sealing faces are usually hardfaced with carbide, and the pressure-seal bonnet makes sealing tighter as system pressure rises. These valves are widely used in main steam, reheat steam and high-temperature, high-pressure feedwater systems in power plants.

· Parallel double-disc design for reliable bidirectional sealing and freedom from thermal jamming · Spreader mechanism presses the discs onto the seats for stable sealing at high temperature and pressure · Pressure-seal bonnet: higher pressure gives tighter sealing · Carbide-hardfaced sealing faces for wear and erosion resistance · Rising stem design with visible position indication · Suitable for high-temperature steam and feedwater systems

For main steam, reheat steam and high-temperature, high-pressure feedwater systems in power plants and for high-temperature isolation in petrochemical service, particularly where bidirectional sealing and large temperature swings are involved.