What is Large Diameter Resilient Seated Seal Gate Valve
Large-diameter resilient-seated gate valves are cast from the highest quality ductile iron or carbon steel, featuring high strength, light weight, and precise dimensions. The gates are interchangeable, and a spiral bevel gear mechanism allows for easy operation by a single person. Opening/closing indicators, or electric/pneumatic actuators, can be added upon request. They offer excellent sealing and rust prevention, ensuring safety, reliability, and a long service life. Suitable for both vertical and horizontal installation, these large-diameter resilient-seated gate valves are widely used in water supply and drainage systems, sewage treatment systems, municipal construction, and industries such as mining, metallurgy, and power plants.
Working Principle
Large-diameter resilient seated gate valves use a rotating handwheel or drive device to vertically raise and lower the gate, moving the valve stem:
Open State: The gate rises to the top of the valve chamber, allowing fluid to flow freely.
Closed State: The gate descends to the valve seat, completely blocking fluid flow.
Its sealing surface is perpendicular to the fluid direction, achieving a seal through the tight fit between the gate and the valve seat.
Core Structure
Valve Body: The main part connecting the pipeline, bearing fluid pressure.
Gate: The core component, available in wedge (single wedge, double wedge) and parallel types:
Wedge Gate: Achieves self-sealing through a wedge angle, suitable for high-temperature and high-pressure applications.
Parallel Gate: Simple structure, easy to repair after sealing surface wear, but slightly inferior sealing performance.
Valve Seat: Forms the sealing surface with the gate; the material must be fluid-compatible.
Valve Stem: Connects the handwheel and the gate, transmitting power.
Sealing Device: Includes a stuffing box (prevents leakage at the valve stem) and a valve cover seal. III. Main Features
Advantages:
Low fluid resistance: Unobstructed flow when fully open, resulting in low pressure loss.
Good sealing: Tight fit between the gate and seat, suitable for applications requiring high sealing performance.
High temperature and high pressure resistance: Wedge gate valves can withstand extreme operating conditions.
Bidirectional flow: No flow direction restriction, flexible installation.
Disadvantages:
Long opening and closing time: The gate needs to be raised and lowered vertically, resulting in slower operation.
Complex structure: More parts, making maintenance more difficult than with gate valves.
Easily worn sealing surfaces: Frequent opening and closing may lead to leakage.
Application Scenarios
Oil and Gas: Long-distance pipelines, refineries, natural gas processing plants.
Chemical Industry: Pipelines for transporting corrosive media.
Power Industry: Boiler feedwater, steam pipelines.
Water Treatment: Waterworks, wastewater treatment plants.
Shipbuilding and Metallurgy: Ship piping systems, blast furnace cooling water pipelines.
Large Diameter Resilient Seated Seal Gate Valve in stock
