Stainless Steel Electric Wafer-type Metal Hard-seal Butterfly Valves

The Stainless Steel D973H Electric Wafer-type Metal Hard-seal Butterfly Valve is a triple-offset butterfly valve fabricated from 304/316/304L/316L stainless steel or 2205 duplex stainless steel. Equipped with an electric actuator, it enables remote on-off operation or continuous regulation of the valve.

Featuring a wafer-type body, the valve is clamped between pipeline flanges via through bolts without requiring independent flanges. This design ensures a compact overall structure, lighter weight, and convenient installation and maintenance.

With the triple-offset metal hard-seal as its core design, the valve achieves nearly friction-free contact between the disc and valve seat during opening and closing, significantly reducing wear on the sealing surface. It maintains stable sealing performance and an extended service life even under medium-high pressure, high-temperature, particle-containing, or corrosive media conditions, making it suitable for long-term operation in automated control systems. In international projects and automated pipelines, this valve—commonly referred to as a Stainless Steel Electric Wafer-type Metal Hard-seal Butterfly Valves—is ideal for applications with space constraints, frequent installation requirements, or remote control needs.

Structure & Working Principle

1. Triple-offset Structure Design

The valve adopts a triple-offset structure incorporating axial offset, radial offset, and sealing surface cone angle offset. This design allows the disc to disengage from the valve seat at the initial opening stage and achieve elastic compression only at the final closing phase, effectively eliminating the scraping issue common in traditional butterfly valves.

2. Electric Actuator Drive

The electric actuator receives signals (switch signal or 4–20mA signal) from the control system and outputs stable torque through a reduction gear mechanism, driving the stem to rotate the disc for precise on-off operation or flow regulation.

3. Wafer-type Connection

The valve body is clamped between pipeline flanges and secured entirely by through bolts, reducing installation space requirements. It is particularly suitable for equipment-dense facilities or retrofit projects.

Key Features

In automated pipeline systems, the Stainless Steel Electric Wafer-type Metal Hard-seal Butterfly Valves reduces installation and operational costs while ensuring superior sealing performance.

Technical Parameters

Material Configuration

Typical Applications

This valve is widely used in the following systems:

● Petrochemical and coal chemical plants

● Steam and high-temperature water systems in the power industry

● Flue gas and dust pipelines in the metallurgical industry

● Municipal heating and district energy supply systems

● Automated control pipe networks and retrofit projects

In systems with space constraints or requiring frequent operation, the Stainless Steel Electric Wafer-type Metal Hard-seal Butterfly Valves offers distinct structural and control advantages.

Selection & Use Notes

1.Select stainless steel or duplex stainless steel materials based on the corrosivity of the medium.

2.For the wafer-type structure, reserve sufficient clamping margin to ensure reliable sealing.

3.Match with high-torque electric actuators for large-diameter or high-pressure applications.

4.In automated systems, verify the signal compatibility and actuator protection class as key priorities.

Maintenance & Reliability Notes

The metal hard-seal structure is suitable for long-term high-temperature operation. However, it is recommended to regularly inspect the tightness of clamping bolts, stem packing, and actuator operating status. Proper maintenance can effectively extend the service life of the Stainless Steel Electric Wafer-type Metal Hard-seal Butterfly Valves and reduce downtime risks.