At present, as an equipment used for the on-off and flow control of pipeline, the centerline type butterfly valve has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower. In the well-known butterfly valve technology, its sealing mostly adopts the sealing structure with the materials in rubber, polytetrafluoroethylene, etc. Due to the structural limitation, it cannot withstand high temperature and high pressure, and not resistant to corrosion and wear.

The structure feature of the centerline butterfly valve is that the shaft center of stem, the center of the disc and the center of the body are in the same position. The structure is simple and the manufacture is convenient.

The axis of the valve stem deviates from the disc center and body center at the same time, and the rotation axis of the valve seat has a certain angle with the axis of valve body passage, which is called three eccentric butterfly valve.

Triple eccentric butterfly valves are widely used in metallurgy, electric power, petrochemical industry, water supply and drainage and municipal construction, etc. for regulating flow and conveying fluid. The material can be cast iron, cast steel, stainless steel.

The triple eccentric butterfly valves can withstand pressure up to 2500lbs, and temperature between -196 ℃ and 700 ℃. And it can achieve zero leakage and the regulation ratio is as high as 100:1. That's to say, in all kinds of harsh and critical process control pipelines, whether it is used as a on-off valve or a control valve, as long as it is properly selected, the butterfly valve can be used with safety. And what's more, it's with low cost.

 1. The valve body, disc, and sealing ring of high-performance butterfly valves are commonly made of highly corrosion-resistant materials such as stainless steel and titanium alloys. In contrast, ordinary butterfly valves are mostly made of materials such as cast iron, ductile iron, carbon steel, etc., which have lower corrosion resistance than high-performance butterfly valves.

2. The sealing performance of high-performance butterfly valves is better than that of ordinary butterfly valves, mainly due to the material and structural design of their sealing rings. The sealing ring of high-performance butterfly valves is generally made of materials such as hard alloy and polytetrafluoroethylene, which have good sealing effects. Ordinary butterfly valves often use elastic materials such as rubber and polyurethane as sealing rings, which have a relatively short lifespan.

3. High-performance butterfly valves have a relatively wide temperature range, able to withstand higher and lower temperatures, and have a wider applicability; However, ordinary butterfly valves have a narrow temperature range and are generally only used at room temperature.

4. High performance butterfly valves have higher pressure capacity compared to ordinary butterfly valves. They can withstand greater pressure, and have higher safety.

5. The pins on the stem are welded on. The stem has no risk of blowing out.
 
High-Performance Butterfly Valve
Valve design: API 609
Double Offset
Soft Seat, Replaceable type
Fire Safe Seat Ring & Fire Safe Seat Insert: API 607
The valve design is sealing: Bi-Directional
Type: Lug, wafer, double flanges
Valve Face to Face: API 609
Testing & inspection: API 598 - tight A
Body: Cast Material Carbon Steel, Stainless Steel, Alu. Bronze
Disc:  Stainless Steel, Alu. Bronze
Stem: 17-4PH/ A182 F51
Seat: Reinforced Teflon (R-PTFE)
Operation: lever, Gearbox + HW
Operation: Manual Gear Operator with hand wheel + position indicator  to be done ANTI-ACID paint coating