Worm Gear Metal Seated Ball Valve

The worm gear metal seated ball valve is a flange-connected, metal-to-metal hard seal ball valve, manually operated by a self-locking worm gear reducer. It opens and closes with a 90° ball rotation, engineered for high temperature, high pressure and abrasive working conditions. Its core parts include the valve body, metal ball, metal hard-seat sealing assembly, valve stem and flanged ends.

Two common designs are available: floating ball type for medium pressure and moderate high temperature service, and trunnion mounted fixed ball type (supported by upper/lower trunnions) for high-pressure, large-bore and extreme high-temperature pipelines. The self-locking worm gear design eases operation and holds the worm gear metal seated ball valve position firmly against high pressure and pipeline vibration.

Product Specifications and Details

Product Features

1. Metal hard-seat design with hardfaced sealing surfaces delivers excellent resistance to high temperature, high pressure, abrasion and erosion, suitable for abrasive media such as hot oil, steam, pulverized coal and ash slurry, with a much longer service life than soft-seated valves. Two structures available: floating ball for medium pressure service and trunnion fixed ball for high-pressure, large-bore applications.

2. Self-locking worm gear drive greatly reduces operating torque for easy manual operation on large-size valves, preventing accidental valve movement caused by vibration and pressure difference. 90-degree rotation enables quick full open/close operation.

3. Robust WCB carbon steel body, available in DN15-DN300 sizes and PN16/PN25/PN32/PN40 pressure ratings. Standard flange connection ensures easy installation and maintenance, with full bore options for low flow resistance.

4. Precisely machined sealing surfaces and anti-blowout stem structure improve tightness and safety, with strict factory testing for reliable long-term service (primarily for shut-off service, not permanent fine throttling).

5. Widely used in thermal power, petrochemical, coal chemical, metallurgy and central heating pipeline systems for main line isolation and flow control.

Brand Promise

All products manufactured by Xiangzheng pass strict quality testing and appearance inspection, and come with a 1-year quality guarantee.

FAQ

1. What is the main advantage of a worm gear metal seated ball valve?

The metal seated design provides better resistance to high temperature, high pressure, abrasion, and erosion compared with soft seated ball valves. The worm gear operator also reduces operating torque for large-size valves.

2. What media can be used with this metal seated ball valve?

It is suitable for hot oil, steam, high-temperature chemical media, coal powder, ash slurry, and other industrial fluids with high temperature or abrasive characteristics.

3. What is the temperature range of this valve?

The standard working temperature range is -20℃ to 425℃, depending on valve material, sealing structure, and operating conditions.

4. What is the difference between floating ball and trunnion mounted ball valve?

Floating ball valves are mainly used for medium pressure applications, while trunnion mounted ball valves are suitable for large diameter and high-pressure pipelines.

5. Why choose a worm gear operator instead of a handle?

The worm gear reducer lowers the operating torque of large-size ball valves and keeps the valve position stable through its self-locking function.

6. What sizes and pressure classes are available?

Xiangzheng supplies worm gear metal seated ball valves in sizes from NPS 1/2″ to 24″ (DN15-DN600) with pressure classes including Class150 to Class600.

7. What materials are available for this ball valve?

Common materials include WCB carbon steel, SS304, and SS316L. The suitable material depends on the working medium and corrosion requirements.

8. Can you provide customized metal seated ball valves?

Yes. We can customize valve size, pressure rating, flange standard, sealing materials, body materials, and operating methods according to project requirements.