Oxygen Ball Valve

The Oxygen Ball Valve is a specialized high-performance ball valve designed for oxygen service and other demanding gas applications. It uses a metal-to-metal hard sealing structure, flexible graphite packing, and stainless steel plus flexible graphite wound gaskets to provide reliable sealing performance, including enhanced fire resistance.

The valve is available in floating-ball and fixed-ball configurations and can be manufactured for high-pressure, high-temperature, cryogenic, and ultrapure gas applications. Specially treated sealing surfaces provide excellent wear resistance, low friction, and smooth opening and closing without sticking.

All components that come into contact with oxygen are manufactured from suitable nickel-based alloys or ultra-low-carbon austenitic stainless steels, while the complete valve undergoes strict degreasing and oil-removal procedures to meet oxygen-service requirements.

Product Specifications

Technical Standards

Structural Configurations

The oxygen ball valve is available in two primary configurations:

Floating Ball Structure

Small-diameter valves generally use a floating-ball structure. The ball is supported by the valve seats and moves slightly under pressure to maintain contact with the sealing surfaces.

Fixed Ball Structure

Large-diameter valves generally use a fixed-ball structure. The ball is supported by upper and lower stems or bearings, reducing the operating torque and improving stability for larger valves and higher-pressure applications.

Oxygen-Service Design Features

Special Hardened Sealing Technology

The ball and seat sealing surfaces undergo specialized hardening treatment. The resulting sealing surface provides high hardness, wear resistance, oxidation resistance, and low friction.

The processed hard-alloy layer has a minimum thickness of approximately 0.4 mm, with hardness reaching approximately HRC 61–64 according to the specified material and treatment.

This design helps prevent metal adhesion and sticking under high-pressure, high-temperature, and ultrapure-gas operating conditions.