Stainless Steel Electric Flanged Metal Hard-Seal Butterfly Valves

The Stainless Steel Electric Flanged Metal Hard-Seal Butterfly Valves is an industrial butterfly valve featuring a triple-offset structure, electric actuator drive, and flange connection. Its valve body and key pressure-bearing components are fabricated from 304, 316, 304L, 316L stainless steel, or duplex stainless steel, with a metal-to-metal hard-seal design.

Actuated by electric actuators that receive control signals, the valve drives the stem to rotate the disc, enabling remote on-off operation or continuous regulation of media in pipelines. The triple-offset structure effectively reduces friction on the sealing surface, maintaining stable sealing performance even under high-temperature, high-pressure, and particle-containing media conditions.

This electric stainless steel flanged metal hard-seal butterfly valve balances corrosion resistance, wear resistance, and structural durability, making it ideal for industrial systems requiring high automation and operating under harsh conditions.

Structure & Working Principle

1.Triple-Offset Structure Design

The D943H series adopts a classic triple-offset butterfly valve structure:

First Offset: The stem axis is offset from the valve body center.

Second Offset: The stem axis is offset from the sealing surface center.

Third Offset: The sealing pair forms an inclined cone structure.

This design allows the disc to disengage from the valve seat at the initial stage of opening and closing, avoiding scratching of the sealing surface, effectively reducing wear, and extending service life.

2.Electric Drive Mode

The valve is equipped with an electric actuator, available in two types:

● On-off Type (two-position control)

● Regulating Type (proportional control with 4–20mA signal)

The actuator converts electrical signals into mechanical torque, driving the coordinated movement of the stem and disc to achieve stable, repeatable on-off or regulating actions.

3. Key Features

All-Stainless Steel Pressure-Bearing Structure

The valve body, flanges, and main pressure-bearing components are integrally cast or forged from stainless steel, offering:

● Excellent corrosion resistance

● Stable high-temperature strength

● Compatibility with acidic, alkaline, chloride-containing, or sulfur-containing media

Metal Hard-Seal Design

The metal-to-metal sealing pair can be optionally overlaid with stellite or nickel-based alloy, featuring:

● No softening or aging under high-temperature conditions

● Adaptability to frequent opening/closing and particle-containing media

● Compliance with API 609 Class V leakage rating requirements

Flange Connection

It adopts standard flange connection, complying with national or American standards, facilitating easy installation and maintenance, and is suitable for medium-to-large diameter pipeline systems.

Compatibility with Automation Systems

This Stainless Steel Electric Flanged Metal Hard-Seal Butterfly Valves can be directly integrated into DCS, PLC, and other control systems, supporting remote control and status feedback, and is suitable for continuous operation and centralized control scenarios.

Technical Parameters

Material Specification

Valve Body

Valve Disc

Stem & Valve Seat

● Stem: A182 F304 / F316 / F51

● Valve Seat: Stainless steel, stellite, or nickel-based alloy

Applications

This Stainless Steel Electric Flanged Metal Hard-Seal Butterfly Valves is widely used in the following fields:

● Petrochemical plants

● Power and heating systems

● Metallurgical and high-temperature flue gas pipelines

● Coal chemical and syngas systems

● Municipal heating and industrial steam pipe networks

Typical media include high-temperature steam, superheated steam, dust-laden flue gas, oil products, corrosive chemical media, and high-temperature water.

Selection Guidelines

Material Selection

Choose 304, 316, or duplex stainless steel based on medium corrosivity and temperature. For particle-containing conditions, opt for discs with hard alloy overlay welding.

Pressure & Torque Matching

For large-diameter or high-pressure applications, equip the valve with a high-torque electric actuator to ensure reliable opening and closing.

Control Mode Confirmation

Select the on-off type for simple opening/closing tasks; choose the regulating type for flow or pressure regulation needs.

Flange Standard Uniformity

Ensure that the valve flange fully matches the pipeline flange in terms of pressure class and sealing surface type.

Brief Operation & Maintenance

● Inspect the valve body, flanges, actuator, and signal wiring before commissioning.

● For high-temperature applications, heat up slowly to avoid thermal shock.

● Regularly check the sealing performance and actuator operating status.

● In case of leakage or jamming, perform maintenance only after the system is depressurized.

Technical Summary

Combining a triple-offset structure, all-stainless steel pressure-bearing design, and metal hard-seal technology, this product delivers stable operation under high-temperature, high-pressure, and complex media conditions. The Stainless Steel Electric Flanged Metal Hard-Seal Butterfly Valves are suitable for industrial pipeline systems with stringent requirements for reliability, automation, and service life.