ANSI Stainless Steel Flange Ball Valves

The ANSI Stainless Steel Flange Ball Valves is a quarter-turn shut-off valve designed and manufactured in accordance with ANSI/ASME standards. Featuring a full stainless steel body and ANSI flange connection, it is widely used in international pipeline systems.

The valve operates through a 90° rotation of the ball to achieve quick opening, closing, and flow control. Its main components include a stainless steel body, ball, stem, seats, and optional actuators (manual, pneumatic, or electric). Thanks to the excellent corrosion resistance, temperature resistance, and mechanical strength of stainless steel, the ANSI Stainless Steel Flange Ball Valves perform reliably in demanding and corrosive service conditions.

It is commonly applied in oil & gas, petrochemical, power generation, and general industrial piping systems.

Working Principle

The ANSI Stainless Steel Flange Ball Valves functions by rotating the ball via the stem:

Fully Open: Ball bore aligns with the pipeline, allowing smooth, low-resistance flow

Fully Closed: Ball rotates 90° to completely block the flow

Throttling Position: Intermediate positions (0°–90°) allow limited flow regulation

This simple quarter-turn design gives the ANSI Stainless Steel Flange Ball Valves fast operation, tight shut-off, and minimal pressure drop.

Key Features

Compliance with ANSI/API Standards

Designed according to API 608 and ANSI B16.34, ensuring clear pressure-temperature ratings and easy integration into international projects.

Full Stainless Steel Construction

Available in F304, F316, and F316L materials to handle corrosive media such as chlorinated water, acids, alkalis, and sour service.

Reliable Flanged Connection

ANSI B16.5 RF or RTJ flanges provide secure installation, easy maintenance, and standardized pipeline compatibility.

Optional Ball Structures

Class 150 / 300: Typically floating ball design

Class 600 and above: Typically trunnion mounted ball for lower torque

This flexibility allows the ANSI Stainless Steel Flange Ball Valves to cover a wide pressure range.

Flexible Seat Options

Main Technical Specifications

Design & Testing Standards

To ensure reliability and traceability, the ANSI Stainless Steel Flange Ball Valves complies with:

Typical Applications

The ANSI Stainless Steel Flange Ball Valves are widely used in:

Oil and petrochemical plants

Natural gas transmission

Fine chemical processing

Power and steam systems

Pharmaceutical and food pipelines (with proper materials)

Corrosive industrial pipelines

It provides reliable shut-off performance in medium to high pressure services.

Selection Guidelines

For optimal performance, consider the following:

① Pressure Class Matching

Select Class 150 / 300 / 600 according to pipeline design pressure and ANSI B16.34 ratings.

② Material Compatibility

③ Seat Type Selection

Clean service → Soft seat

High temperature or solids → Metal seat

④ Flange Facing Choice

Standard service → RF

High pressure or high sealing requirement → RTJ

Installation & Maintenance Tips

To extend service life:

Install flanges according to ANSI B16.5 with cross-tightening

Verify model and rating before installation

Operate strictly within the 0°–90° range

Periodically check stem packing and flange sealing

Apply corrosion-resistant grease as required

Drain valve cavity before long shutdowns

Proper maintenance helps ensure long-term stable operation of the ANSI Stainless Steel Flange Ball Valves.