“High-performance double eccentric butterfly valves” VS “General double eccentric butterfly valves”

General double eccentric butterfly valve: a basic double eccentric structure that deviates from the center of the butterfly plate and valve body through the axis of the valve stem, reducing friction during opening and closing and extending service life.

However, its performance has certain limitations (such as leakage rate and pressure rating)

High performance double eccentric butterfly valve: further improved on the basis of general double eccentric, emphasizing sealing reliability, low torque, and wide working condition adaptability, often directly referred to as "high-performance butterfly valve"

There are significant differences in design, performance, and application scenarios between high-performance double eccentric butterfly valves and general double eccentric butterfly valves.

The specific differences that JUDU are analyzed as follows:

1. Sealing performance

● High performance double eccentric butterfly valve: With elastic seat design, achieving "zero leakage" and more reliable sealing

● General double eccentric butterfly valve: Mainly with soft sealing, some can be sealed with metal, but there is a certain amount of leakage

2. Pressure rating

● High performance double eccentric butterfly valve:Higher pressure level(such as PN10~PN100，150~600LB）

● General double eccentric butterfly valve: Not resistant to high pressure, suitable for medium and low pressure environments

3. Operator and torque

● High performance double eccentric butterfly valve:Elastic valve seat design reduces torque and lowers drive device costs

● General double eccentric butterfly valve: The opening resistance is relatively low, but the torque has not been specifically optimized

4. Materials and lifetime

● High performance double eccentric butterfly valve: The sealing materials of high-performance butterfly valves (such as PTFE, VITON) have stronger corrosion resistance, and combined with elastic valve seat design, their service life is further extended.

● General double eccentric butterfly valve: Although general double eccentric butterfly valves have a longer lifetime than centerline butterfly valves, their performance deteriorates faster under extreme working conditions.

5. Application

● High performance double eccentric butterfly valve: used in high-pressure, highly corrosive or sealing demanding scenarios such as power plants, chemical plants, steel mills, etc

● General double eccentric butterfly valve: for conventional systems such as water plants and municipal drainage.

JUDU summary

The high-performance double eccentric butterfly valve solves the leakage and working condition limitations of ordinary double eccentric butterfly valves through elastic sealing, high pressure rating, and low torque design, making it more suitable for complex industrial environments; However, ordinary double eccentric butterfly valves have more advantages in terms of cost-effectiveness and conventional operating conditions. When making a selection, it is necessary to make a comprehensive judgment based on pressure, corrosiveness of the medium, and sealing requirements.