Stainless Steel Butt-Welding Metal-Sealed Butterfly Valves

The stainless steel D363H butt-welding metal-sealed butterfly valve is an industrial butterfly valve designed for medium–high pressure, high-temperature, and complex operating conditions. It features a triple-offset structure and metal hard-seal design, with butt-weld ends that can be directly welded into the pipeline system. This configuration reduces leakage risks associated with flange connections and maintains stable sealing performance even under strong vibration and long-term operation.

As a typical stainless steel butt-welding metal-sealed butterfly valves, its material selection, structural design, and sealing method are all optimized for harsh conditions. It is widely used in petrochemical, power, metallurgical, coal chemical, and long-distance pipeline systems where reliability is critical.

Structure & Working Principle

The valve adopts a triple-offset metal-seal structure. The eccentric design allows the disc to quickly disengage from the seat during opening and closing, significantly reducing friction and wear on the sealing surfaces. The stem and disc are rigidly connected and driven by a worm gear mechanism, ensuring stable and controllable operation and adjustment.

The butt-weld ends are directly welded to the pipeline, creating a continuous metal structure that enhances overall system strength and vibration resistance. This design is particularly suitable for space-constrained or permanently installed process lines where frequent disassembly is not allowed.

Key Features

Butt-Weld Connection

No flange transition, reducing potential leakage points

Suitable for high-pressure, high-vibration, and long-distance pipelines

Strong integrity after welding, ensuring stable operation

Metal Hard-Seal Design

Metal sealing surfaces on both seat and disc

Stellite overlay or nickel-based alloy options available

Suitable for high-temperature, high-pressure, and particle-laden media

Stainless Steel & Duplex Material Options

304 / 304L for general applications

316 / 316L for highly corrosive conditions

2205 duplex steel for high-pressure, sulfur-containing, and long-distance pipelines

Worm Gear Actuation

Large transmission ratio for easy operation

Ideal for large-diameter and high-pressure applications

Smooth operation, suitable for fine flow adjustment

As a mature industrial product, the stainless steel butt-welding metal-sealed butterfly valves provides excellent structural stability and maintainability during long-term operation.

Technical Parameters

Applications

The stainless steel butt-welding metal-sealed butterfly valves is widely used in:

Oil, gas, and refined product long-distance pipelines

Syngas and high-temperature medium systems in coal chemical plants

High-temperature steam and flue gas pipelines in power plants

Dust-laden and particle-containing gas systems in metallurgy

Highly corrosive, high-temperature, and high-pressure pipelines in chemical plants

Selection & Engineering Notes

During engineering selection, key factors include medium composition, design pressure, operating temperature, and pipeline welding standards. For abrasive or particle-laden media, a Stellite-overlay disc is recommended. For long-distance pipeline applications, 2205 duplex stainless steel is preferred, and compliance with API 6D should be confirmed.

Operation & Maintenance

With proper selection and standardized welding, this valve requires minimal maintenance. Routine checks should focus on worm gear lubrication, stem packing, and the condition of weld joints. A well-planned maintenance schedule will effectively extend the service life of the stainless steel butt-welding metal-sealed butterfly valves and ensure long-term system safety.