The generation of Triple Eccentric Butterfly Valve is evolved through Single-eccentric butterfly valve and double-eccentric butterfly valve. Now let's understand the technical difficulties of Triple Eccentric Butterfly Valve. How to solve it?
The technical difficulties of high temperature tri-eccentric metal hard-sealed butterfly valve include the following aspects: 1. valve material selection. 2. Solve the problem of valve lock and calculate the expansion gap of high temperature material. 3. Welding and hardening of high temperature materials. 4. Three-dimensional simulation of high temperature stress analysis test. 5. Process realization. 6. Mold making.

The solutions mainly cover the following parts:

(1) Structural design scheme: There are many kinds of butterfly valves, such as mid-line butterfly valves, double-eccentric butterfly valves and three-eccentric butterfly. The first two butterfly valves are simple in structure, easy to process and relatively low in manufacturing cost, but the upper and lower axes of mid-line butterfly valves have poor seatability; the double-eccentric butterfly valves have geometric interference, so the seat must be. In order to overcome the interference between the upper and lower axles and achieve sealing, it is necessary to design elastic. At high temperature, the design of the structure and clearance between the rotating parts is also a big difficulty. It is necessary to ensure that the switch is smooth and the sealing is good at high temperature. However, the elastic seat may fail at 800 C and the whole operating system may fail. Finally, after many discussions and studies, it is decided to adopt the structure of Triple Eccentric Butterfly Valve. Although the difficulty of design and processing has increased several times, it is reliable to apply in such working conditions.
(2) Selection of high-temperature resistant materials: 800 C high-temperature environment, equivalent to the valve in a steel-making furnace, in order to make the valve switch normally sealed, material selection is a difficult problem, especially the sealing role of fillers, gaskets and other non-metallic materials.
(3) Mould manufacturing is the most difficult in the whole processing and manufacturing process. Because of the large caliber, the requirements for manufacturing equipment are very high.
(4) Processing and welding equipment: DN1800 high-temperature Triple Eccentric Butterfly Valve  with large external dimension, 2250mm outer diameter of valve body, 3820mm total height of valve body, 1722mm outer diameter of sealing ring, difficult processing of large-caliber valve, high precision requirement for manufacturing processing tools, complex surfacing welding process of sealing surface, difficult welding, high precision machine tool and sealing ring are adopted. Senior technicians, and through external experts to solve various problems in welding and processing, and even borrow large caliber processing equipment from shipyards to complete valve assembly and pressure debugging. The manufacturing process is complex, and the matching processing tools need to be processed. The processing difficulty can be imagined.
(5) High temperature test: whether the strength and reliability of materials can be guaranteed or not, the final data must be obtained through the test. In order to ensure the reliable operation of the valve, we contacted qualified and powerful heat treatment companies, so that the valve in the high temperature environment of 800 degrees Celsius for valve action test, withstanding the test of harsh working conditions.
Triple Eccentric Butterfly Valvev has been widely used in all walks of life because of its good characteristics. If you need to use Triple Eccentric Butterfly Valve，please contact us.