PU763: High-Performance Polyurethane Sealant & Adhesive

Duplex and Super Duplex stainless steels (like ASTM A995 4A/5A) offer a superior combination of strength and corrosion resistance compared to standard austenitic stainless steels (like 316SS). Their microstructure, a mix of austenite and ferrite, provides high resistance to stress corrosion cracking (SCC), pitting, and crevice corrosion, particularly in environments containing chlorides. This makes the PU763 ideal for offshore platforms, desalination plants, and chemical processing where such conditions are common. The higher strength also allows for a lighter-weight design without compromising pressure ratings.

Yes. For cryogenic services (down to -196°C / -320°F), we construct the PU763 using specific austenitic stainless steel grades (e.g., ASTM A351 CF8/CF8M) and feature an extended bonnet design. The extended bonnet moves the stem packing away from the cold fluid, preventing it from freezing and ensuring operational integrity of the seal. All cryogenic valves undergo special cleaning and testing protocols to ensure safety and performance.

These are two of the most rigorous international standards for fugitive emissions. API 624 specifically tests valves for emissions performance with methane at elevated temperatures, simulating real-world refinery conditions. ISO 15848-1 is a comprehensive standard that classifies valve sealing performance through mechanical and thermal cycling. A PU763 compliant with these standards guarantees minimal leakage of harmful or valuable process fluids into the atmosphere, ensuring environmental protection, plant safety, and regulatory compliance.

The standard flange end connections for the PU763 comply with ASME B16.5 for sizes up to 24". This includes specifications for dimensions, tolerances, materials, and markings. The most common flange facing is the Raised Face (RF), but we also offer Ring Type Joint (RTJ) for high-pressure, high-temperature services, and Flat Face (FF) for lower pressure applications or specific mating flange requirements.

Trim material selection is critical for valve longevity. Our application engineers can guide you, but here are some general rules:

• Standard Service (Water, Oil, Gas): 13% Chrome or 316 Stainless Steel is typically sufficient.
• Abrasive or Erosive Service: Stellite 6 hardfacing on the seat and disc is the industry standard for excellent wear resistance.
• Corrosive Service (Acids, Chlorides): Materials like Monel, Hastelloy C276, or even Titanium may be required depending on the specific chemical concentration and temperature.

For standard configurations (e.g., WCB or CF8M body, sizes DN50-DN300), we maintain a strategic stock and can typically ship within 2-4 weeks. For custom-engineered solutions involving exotic materials or specialized testing, the lead time can range from 8 to 16 weeks, depending on material availability and engineering complexity. We provide a firm delivery schedule upon order confirmation.

Every PU763 comes with a standard 24-month warranty from the date of shipment or 18 months from installation, whichever comes first. This covers defects in materials and workmanship. Beyond the warranty, we offer lifetime technical support, spare parts services, and on-site assistance through our global network of service engineers to ensure your operations run smoothly.