5A Duplex Forged Hard-Seal Lug Butterfly Valve for Subsea Pipelines

Product Features

The 5A super duplex steel offers exceptional resistance to chloride ion corrosion, with a PREN value exceeding 40. It exhibits extremely high resistance to chloride-induced pitting, crevice corrosion, and stress corrosion cracking, and can operate stably over the long term in chloride-containing media at temperatures exceeding 40°C—a performance that ordinary duplex stainless steels (such as 4A) cannot match. Superior Mechanical Strength: Tensile strength ≥ 690 MPa and yield strength ≥ 515 MPa, which is nearly double that of 304 or 316 stainless steel. Under the same pressure rating, valve wall thickness can be reduced, resulting in a lighter overall weight and lower material costs.

Product Advantages

●The sealing surface features a 5A duplex steel substrate overlaid with Stellite or other hard alloys, combining the base material’s corrosion resistance with the overlay layer’s high hardness and wear resistance, enabling it to withstand high-velocity media erosion containing solid particles. The flange bolts on both sides of the lug-type butterfly valve are installed independently; the valve body and sealing surfaces are not subjected to excessive compression from through-bolts, which helps extend the service life of the sealing pair. Additionally, the shorter bolts used in the lug design exhibit minimal creep, thereby reducing the risk of leakage. The double-offset design ensures that the disc rapidly disengages from the seat the moment the valve opens, resulting in virtually no sliding friction or scraping between the metal sealing surfaces during opening and closing, which significantly extends the service life of the seat.

Design Standards

Product detail

Application

Chemical and Petrochemical Industries,Power Generation, Water Treatment and Environmental Protection,Metallurgy and Shipbuilding.

About Us

Zhejiang Yugong Fluid Technology Co., Ltd. is a comprehensive high-tech enterprise integrating production and sales. The company manufactures and operates professional butterfly valves made of stainless steel, carbon steel, titanium and other materials. Founded in 2012, the company is located in Yongjiao Oubei, the "hometown of pumps and valves in China", covering an area of 4,000 square meters and has more than 80 employees. Aiming high and forging ahead, the company looks forward to working hand in hand with new partners and walking all the way!

Our Workshop

F&Q

Customer Service

1. Before signing an official contract with our customer we will help to analyze and provide professional solution based on customer project information and come out with optimum solution.
2. Your inquiry related to our products or price will be replied in 24hrs.
3. Keep informing our customer production process and help arrange quality checking in the factory if necessary.
4. one-year warranty toproducts.