Fixed Flange Ball Valve

Product Details

High-Performance Fixed Flange Ball Valve for High-Pressure Industrial Pipeline Systems

Ainox is a professional fixed flange ball valve manufacturer in China, specializing in the design and production of industrial ball valves for demanding pipeline applications. Our fixed flange ball valve solutions are engineered for high-pressure, large-diameter, and critical service systems where reliable sealing, long service life, and operational safety are essential.

Unlike floating ball valves, a fixed ball valve adopts a trunnion-supported structure where the ball is fixed by upper and lower stems without floating displacement. The sealing performance is achieved through the movement or elastic deformation of the seat sealing ring, reducing friction between the ball and seat during operation.

This advanced structure significantly lowers operating torque and improves durability, making the valve suitable for harsh working conditions in industries such as oil and gas, chemical processing, power generation, metallurgy, and long-distance pipeline transportation.

Ainox supplies customized forged steel ball valves and industrial fixed ball valve solutions according to customer requirements, including pressure ratings, connection standards, sealing materials, actuation systems, and special surface treatments.

Product Features

1. Frictionless Opening and Closing: The ball and seat do not come into contact, avoiding sealing surface wear.

2. Top-Entry Design: Allows for inline maintenance, reducing downtime and lowering costs.

3. Single Seat Design: Eliminates safety risks caused by abnormal medium pressure buildup in the cavity.

4. Low Torque Design: Easy opening and closing with just a small handwheel.

5. Wedge Sealing: Mechanical force presses the ball onto the seat; sealing performance is not affected by pipeline pressure differentials.

6. Self-Cleaning Sealing Surface: Fluid flows 360° across the sealing surface, automatically removing accumulated debris.

7. Double Block and Bleed (DBB): Double seat design with self-relieving and self-cleaning functions.

8. Fire and Static Resistant: Meets safety standards for pipelines carrying hazardous media such as oil and natural gas.

Applicable Standards

1.Design and Manufacture: API 6D / ASME B16.34 / GB/T 12237

2.Face-to-Face / Structure Length: ANSI B16.10 / GB/T 12221

3.Flange Connections: ANSI B16.5 / ASME B16.47 / GB/T 9113

4. Fire Safety Standard: API 607 / API 6FA

5. Butt Welding Ends: ASME B16.25

6. Socket Welding Ends: ASME B16.11

Main Parts Materials

1.Body: WCB, A105, CF8, CF8M, WC6, WC9, Chrome-Molybdenum Steel, Alloy Steel

2. Ball: Stainless Steel 304/316, 17-4PH; surface may be overlaid or sprayed with Tungsten Carbide

3. Stem: Stainless Steel, 17-4PH; surface may be nitrided or hardened

4. Sealing Surface: PTFE, PEEK, Stellite Alloy, Hard Alloy, Ceramic

5. Bearing: Inner surface hardened (sprayed with hard alloy or nitrided)

Typical Application Fields

1. Oil & Natural Gas: Long-distance pipelines, metering stations, station facilities

2. Chemical Industry: High-pressure autoclaves, hydrogenation units, polysilicon pipelines

3. Power Industry: Main steam, reheat steam, and cooling water systems

4. Metallurgy: Blast furnace gas, converter dust removal

5. Municipal Engineering: High-pressure natural gas, district heating

6. Coal Chemical Industry: Hard-seated fixed ball valves — resistant to particles and erosion

7. Others: Water treatment, food & pharmaceutical, marine/shipbuilding

Packaging & Delivery

1. Minimum Order Quantity: 1 set

2. Delivery Lead Time: 10–25 days (depending on size, pressure rating, and quantity)

3. Payment Terms: T/T (Telegraphic Transfer)

4. Packaging Method: Export standard plywood or steel-framed wooden case.

Service Support

1. Provide selection recommendations and application-matched solutions.

2. Support customization of seat materials, connection types, actuation methods, and special coatings.

3. Provide installation guidance, operation training, and after-sales technical support.

How to Choose the Right Fixed Flange Ball Valve

Selecting the correct valve requires consideration of several factors:

1. Working Pressure and Temperature

Confirm:

• Maximum operating pressure

• Temperature range

• Pressure class requirements

High-pressure applications generally require stronger body materials and optimized sealing structures.

2. Medium Characteristics

Different fluids require different materials.

Important considerations include:

• Corrosiveness

• Particle content

• Chemical compatibility

• Operating environment

3. Connection Requirements

Common connection options:

• Flanged ends

• Butt welded ends

• Socket welded ends

The correct connection ensures safe installation and reliable operation.

4. Actuation Requirements

Ainox provides:

• Manual operation

• Pneumatic actuators

• Electric actuators

• Hydraulic actuators

Automation selection depends on operating frequency and control requirements.

Maintenance Guide for Fixed Flange Ball Valve

Proper maintenance helps extend valve service life and improve system reliability.

Regular Inspection

Check:

• External leakage

• Valve operation condition

• Connection tightness

• Surface corrosion

Sealing System Maintenance

Inspect:

• Seat sealing condition

• Stem sealing performance

• Internal components

Replace worn parts when necessary.

Keep Operating Environment Clean

For outdoor or harsh environments:

• Protect valve surfaces

• Prevent corrosion

• Avoid mechanical impact

Follow Correct Installation Procedures

Incorrect installation may affect:

• Sealing performance

• Operating torque

• Service life

Professional installation helps maximize valve performance.

Custom Fixed Flange Ball Valve Solutions

Ainox provides customized valve manufacturing services for global industrial customers.

Customization options include:

• Seat material selection

• Special coatings

• Connection design

• Pressure rating

• Actuator configuration

• Material customization

As a reliable fixed flange ball valve manufacturer, Ainox supports OEM projects, engineering applications, and customized industrial valve requirements.

FAQ About Fixed Flange Ball Valve

What is the difference between fixed ball valve and floating ball valve?

A fixed ball valve uses upper and lower stem support to hold the ball in position, making it suitable for high-pressure and large-diameter applications. A floating ball valve relies on medium pressure to push the ball against the seat.

Why are fixed flange ball valves used in oil and gas pipelines?

They provide reliable sealing, low operating torque, fire-safe performance, and long service life, making them suitable for critical energy transportation systems.

Can fixed ball valves handle high-pressure applications?

Yes. The fixed ball structure is specifically designed for high-pressure and large-diameter pipeline applications.

Does Ainox provide customized forged steel ball valves?

Yes. Ainox supplies customized forged steel ball valves and fixed ball valve solutions based on customer specifications and project requirements.

How can I request a quotation for a fixed flange ball valve?

Customers can provide valve size, pressure rating, medium type, connection requirements, and operation method. Ainox will recommend a suitable solution and provide a quotation.

Get Professional Fixed Flange Ball Valve Solutions from Ainox

Ainox is a trusted industrial valve manufacturer providing reliable fixed flange ball valve solutions for global customers.

With advanced manufacturing capabilities, strict quality control, and flexible customization services, we support projects requiring high-performance valves for oil and gas, chemical, power, metallurgy, and industrial pipeline systems.

Whether you need standard products or customized forged steel ball valves, Ainox can provide professional technical support, suitable valve selection recommendations, and competitive manufacturing solutions.

Contact Ainox today to discuss your fixed flange ball valve requirements and receive professional product recommendations and quotation support.