Specification

DN600 800LB PN10 SS321 Body and Disc High-Temperature Hard-Seal Flanged Butterfly Valve

I. Product Overview

Newway high-temperature hard-seal flanged butterfly valve is a precision-engineered industrial valve designed for reliable flow control in high-pressure, high-temperature ventilation and process systems. Featuring a DN600 size, 800LB pressure rating, and construction from SS321 stainless steel (for both body and disc), this valve combines robust materials with a hard-seal design to ensure leak-tight performance in demanding environments. Equipped with flanged connections (RF) and electric actuation (with manual override), it caters to applications involving hot gases, flue gas, and high-temperature industrial fluids—ideal for power plants, steel mills, chemical processing, and HVAC systems where thermal stability and durable sealing are critical.

II. Key Attributes and Specification Parameters

Basic Attributes

Structure Design: Concentric butterfly valve with a single-piece SS321 disc rotating within a SS321 body. The disc features a streamlined profile to minimize pressure drop, while the hard-seal mechanism (metal-to-metal seating) ensures tight shutoff.

Body Material: SS321 stainless steel (ASTM A240), selected for its exceptional high-temperature strength (up to 800℃) and resistance to oxidation, scaling, and intergranular corrosion—critical for withstanding prolonged exposure to hot gases.

Disc Material: SS321 stainless steel, matching the body for material compatibility and thermal expansion consistency, which prevents warping or sealing failure under temperature fluctuations.

Sealing System: Hard-seal (metal-to-metal) design, where the disc seals against a precision-machined metal seat. The seat is surfaced with a wear-resistant alloy (e.g., Stellite) to enhance durability and sealing integrity over thousands of cycles.

Pressure Rating: 800LB (ASME Class 800), suitable for high-pressure industrial systems including steam pipelines, gas turbines, and pressurized ventilation ducts.

Temperature Range: -20℃ to 800℃, accommodating extreme heat from flue gas, superheated steam, or industrial process exhaust.

Nominal Diameter: DN600, catering to large-diameter pipeline requirements for high-flow ventilation and process applications.

Connection Type: Raised face (RF) flanged connections per ASME B16.5, ensuring compatibility with global pipeline flanges. Flanges are drilled to match standard bolt patterns for secure, leak-free installation.

Operation Mode: Electric actuation with manual handwheel override. The electric actuator provides precise control (±1° positioning accuracy) and can be integrated into automated systems, while the handwheel enables manual operation during power outages or maintenance.

Media Compatibility: Hot gases (flue gas, combustion air), superheated steam, high-temperature industrial fluids, and abrasive media—SS321’s corrosion and wear resistance make it suitable for harsh environments.

Design Standards: Complies with API 609, ASME B16.34, and ASME B16.5, ensuring adherence to international quality and safety norms for butterfly valves.