High Performance Double eccentric Butterfly Valve
This is an industrial butterfly valve constructed from aluminum bronze. The valve body features a characteristic brass-like metallic hue and utilizes an LT (lug-style) connection configuration. Bolt holes—marked with red seals—are evenly distributed around the perimeter of the valve body, ensuring the high-strength installation required for large-diameter, high-pressure piping systems. The unit is equipped with a top-mounted worm-gear handwheel operator, which allows for effortless 90-degree rotation to open or close the valve without the need for an external power source.
Manufacturing Range
Size Range: Standard production covers DN50–DN300, with the capability to extend from DN25 to DN1000 upon request—meeting requirements for a full spectrum of applications, ranging from piping on small-to-medium vessels to large-diameter seawater lines on offshore platforms.
Pressure Ratings: Standard offerings cover PN1.0–PN1.6 MPa; high-pressure custom versions can reach PN2.5 MPa or higher, while ANSI-standard versions support classes ranging from Class 150 to Class 600.
Temperature Range: Suitable for operating temperatures from -29°C to 300°C. The upper temperature limit can be adjusted based on the seal material: EPDM seals are suitable for temperatures up to 120°C, while PTFE seals allow for operation at higher temperature ranges.
Materials and Configuration: Valve bodies are cast from C95400 aluminum bronze or C95800 nickel-aluminum bronze, with valve stems available in corrosion-resistant materials such as SS416 or Monel alloy. The valves support various actuation methods—including worm gear, manual handle, pneumatic, and electric—and feature a dedicated "LT" lug-style connection design.
Applicable Media: Ideally suited for seawater, brine, and mildly acidic or alkaline media. These valves offer superior resistance to chloride-ion corrosion, cavitation, and marine biofouling, making them specialized valves engineered specifically for marine environments.
Design Features
The valve body is cast from aluminum bronze (typical grades include C95400 and nickel-aluminum bronze C95800), offering high mechanical strength and hardness. It exhibits superior corrosion resistance in seawater and chloride-rich environments—far surpassing that of standard carbon steel or stainless steel—while also providing excellent resistance to cavitation and biofouling.
The design typically features a double-offset or triple-offset sealing configuration, which ensures virtually friction-free operation during opening and closing. This significantly extends the service life and enables bi-directional, zero-leakage sealing.
The top-entry design reduces the number of body connection bolts, enhancing operational reliability under high-pressure conditions and facilitating on-site maintenance, such as the direct replacement of internal sealing components.
Design Standards
Domestic Standards: GB/T 12221 specifies face-to-face (structural) dimensions; GB/T 13927 defines testing requirements for shell strength and sealing performance; and GB 12225 sets quality control standards for copper alloy castings.
International Standards: API 609 serves as the authoritative international manufacturing specification for butterfly valves. MSS SP-80 imposes strict quality requirements on bronze castings, prohibiting the repair of casting defects via plugging or weld-overlay. The valves also comply with international face-to-face dimension standards—such as EN 558 and ISO 5752—as well as major flange connection standards, including those from ASME and JIS.
Key Control Parameters: The standards mandate designs featuring top-entry configurations and triple-offset sealing mechanisms. They also specify testing protocols for the mechanical properties and corrosion resistance of aluminum bronze, ensuring the valves’ long-term, stable operation in marine environments characterized by high salt-spray levels and high chloride-ion concentrations.