Stainless Steel Handle Wafer-Type Metal Hard Seal Butterfly Valves

The stainless steel D73H handle-operated wafer-type metal hard-seal butterfly valve is an industrial butterfly valve primarily constructed from stainless steel and featuring a double-offset design. It integrates a direct-drive handle, wafer-type connection, and metal hard-seal structure, making it suitable for medium-low pressure, high-temperature, and mildly corrosive applications.

By manually turning the handle, the valve stem and disc rotate synchronously to achieve reliable shutoff and basic flow regulation. The wafer-type body design results in a more compact profile, reducing installation space while maintaining structural strength.

In industries such as petrochemicals, power systems, metallurgy, water treatment, and food processing, the stainless steel handle wafer-type metal hard seal butterfly valves is commonly used in piping systems that require a combination of corrosion resistance, temperature resistance, and easy installation. It is particularly well-suited for applications with limited space and moderate operating frequencies.

Structural Features and Working Principle

1.Double-Offset Metal Hard-Seal Structure

The valve adopts a double-offset design, allowing the disc to quickly disengage from the seat during opening and closing, which significantly reduces friction and wear. The metal-to-metal seal maintains stable performance even under high temperature, high pressure, or in media containing trace particles, avoiding the aging and failure issues associated with soft seals in high-temperature environments.

2.Direct Handle Drive

The handle is rigidly connected to the stem, providing a simple structure with a short transmission path and minimal energy loss. For small to medium-sized valves, this enables quick opening/closing and reliable positioning, meeting the practical needs of manual field operation.

3.Wafer-Type Connection

The valve body is clamped between two pipe flanges using through bolts, eliminating the need for independent flanges. This design reduces system weight and installation costs, while also facilitating easy disassembly and maintenance. It is especially useful in space-constrained pipe racks or equipment areas.

Technical Parameters

• Nominal diameter: DN 50 – DN 600 (NPS 2" – 24")

• Pressure rating: PN 10 / 16 / 25, Class 150 / 300

• Connection: Wafer-type (GB/T 9113 / ANSI B16.5)

• Operation: Direct handle drive

• Temperature range: -46℃ ～ 550℃

• Seal type: Metal hard seal (Class V)

• Structure: Double-offset

• Standards: GB/T 12238, API 609, ANSI B16.34

Material Configuration

The body, disc, stem, and seat can all be selected from different stainless steel grades to suit specific media and operating conditions.

• Body: CF8 / CF8M / CF3 / CF3M

• Disc: Solid stainless steel or stainless steel with Stellite overlay

• Stem: A182 F304 / F316 / F304L / F316L

• Seat: Stainless steel or Stellite metal sealing surface

This configuration ensures that the stainless steel handle wafer-type metal hard seal butterfly valves maintains a long service life in high-temperature steam, corrosive liquids, and mildly abrasive media.

Applications

The valve is suitable for the following typical applications:

• High-temperature oil and steam pipelines in petrochemical plants

• Boiler systems and auxiliary pipelines in the power industry

• High-temperature flue gas and cooling water systems in metallurgy

• Industrial and municipal water treatment pipelines

• Food and beverage processing where material cleanliness is required

In these scenarios, the stainless steel handle wafer-type metal hard seal butterfly valves provides structural strength, sealing reliability, easy maintenance, and overall system cost-effectiveness.

Selection and Usage Recommendations

When selecting a valve, key considerations include media corrosivity, operating temperature, and pipeline pressure rating to ensure proper matching of material and seal structure. For large-diameter or high-pressure applications, verify that the handle torque meets field operation requirements. During installation, ensure flange alignment and uniform bolt tightening to fully leverage the sealing advantages of the wafer-type design.

Maintenance and Operational Reliability

Regular inspection of bolt tightness, stem packing, and sealing surface wear will effectively extend the valve’s service life. The metal hard-seal structure allows for on-site lapping and component replacement, reducing long-term operational costs and enhancing reliability in continuous operating conditions.