150LB 4A Duplex Hard-Seal Lug Butterfly Valve for Seawater Circulation

Product Features

The material offers exceptional strength, with 4A duplex steel exhibiting a tensile strength of ≥ 690 MPa and a yield strength of ≥ 450 MPa (the yield strength of 2507 can reach over 550 MPa), which is approximately twice that of ordinary austenitic stainless steel. This allows valves to be designed to be lighter for the same pressure rating, effectively conserving material and reducing equipment manufacturing costs. Additionally, it offers superior resistance to chloride ion corrosion. 4A duplex steel exhibits extremely high resistance to chloride pitting, crevice corrosion, and stress corrosion cracking. Its pitting resistance equivalent (PREN) value exceeds 40, far surpassing that of 304 and 316L stainless steels, and is even comparable to 6% Mo super austenitic stainless steel. It can operate stably over the long term in harsh corrosive environments such as seawater and chloride-containing liquids.

Product Advantages

●The sealing surface features a composite structure of 4A duplex steel and wear-resistant hard alloy, which not only withstands medium corrosion but also resists wear caused by fluid erosion, maintaining excellent sealing performance even after long-term use. The bolts used in the lugs are shorter and do not pass through the entire valve body, resulting in minimal creep and reducing the risk of leakage. The double-offset design reduces opening and closing torque by approximately 50% compared to center-symmetrical butterfly valves, making manual operation smooth and effortless. Smaller-sized pneumatic or electric actuators can also be selected as options, reducing drive system costs.

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.