Worm Gear Flanged Ball Valve

● and connected to pipelines via flange joints. It controls fluid flow, switches flow directions and regulates flow rate through 90° rotation of the ball, and is widely used in medium and large-diameter industrial pipeline systems.

Structure

●  Main components: valve body, ball, valve seat sealing assembly, valve stem, flanged pipe ends

●  Actuation unit: worm gear reducer + handwheel, with a self-locking function

●  Two main types:

Floating ball type: The ball can float slightly and presses against the valve seat for sealing under medium pressure. It has a simple structure and is mainly used for medium and low-pressure conditions.

Trunnion mounted (fixed ball) type: The ball is fixed by upper and lower trunnions, with floating valve seats for sealing. Suitable for high-pressure and extra-large-diameter working conditions.

●  Common materials: carbon steel, stainless steel (304/316L) for valve bodies; PTFE and metal seals for valve seats.

Production standard

Design and manufacture as GB/T12237

Face to face dimensions as GB/T12221

End flange dimension as JB/T79

Pressure test as JB/T9092

Main Connection Dimensions

Materials for Main Parts

Working Principle

Rotating the handwheel drives the worm gear reducer, which turns the valve stem and the internal ball through a 90° rotation:

●  When the through hole of the ball aligns with the pipeline passage, the valve is fully open for smooth medium flow.

●  When the through hole is perpendicular to the pipeline passage, the valve is fully closed to block fluid flow.

●  The worm gear mechanism features self-locking performance, which maintains the valve at a fixed opening position and prevents accidental movement caused by fluid pressure or pipeline vibration. It also greatly reduces the operating torque required for opening and closing large-diameter valves.

Application Areas

Oil & Gas Pipeline Systems

Used for isolation and flow control in oil transportation, gas transmission, and processing facilities where reliable shut-off is required.

Chemical and Petrochemical Plants

Suitable for process pipelines handling various industrial fluids where stable operation and material compatibility are important.

Water Treatment Projects

Applied in water supply, wastewater treatment, and municipal pipeline systems due to easy operation and maintenance.

Power Generation Facilities

Used in cooling water systems, auxiliary pipelines, and industrial fluid control applications.

General Industrial Systems

Suitable for large pipeline networks requiring manual operation with reduced operating torque.

FAQ

1. What is the difference between a worm gear ball valve and a manual ball valve?

A worm gear ball valve uses a reduction mechanism to increase operating torque, making it easier to operate large-size valves compared with direct handle-operated ball valves.

2. When should I choose a worm gear operated ball valve?

Worm gear operation is recommended for large diameter valves, high-pressure pipelines, or applications where frequent manual operation requires lower operating force.

3. Are floating ball and trunnion mounted designs both available?

Yes. Xiangzheng supplies floating ball and trunnion mounted designs according to valve size, pressure rating, and application requirements.

4. What standards are used for manufacturing these ball valves?

The valves are designed according to GB/T12237, with face-to-face dimensions according to GB/T12221, flange dimensions according to JB/T79, and pressure testing according to JB/T9092.

5. Can you provide customized worm gear flanged ball valves?

Yes. Customization is available for valve material, pressure class, flange standard, sealing material, operation method, and special working conditions.

6. What tests are performed before shipment?

Each valve undergoes inspection procedures including dimensional inspection, pressure testing, sealing testing, and final quality verification before delivery.

Manufacturing & Quality Control

As an experienced industrial valve manufacturer in China, Xiangzheng applies strict control throughout the manufacturing process of worm gear flanged ball valves.

Production includes:

●  Raw material inspection

●  CNC machining of valve components

●  Ball and sealing surface processing

●  Assembly inspection

●  Pressure testing

●  Leakage testing

●  Final dimensional verification

The company follows international and industrial valve standards to ensure product consistency and compatibility with different pipeline systems.