High performace butterfly valve is just a adjective, never a noun most people used for.Let’s start with what is a butterfly valve? A butterfly valve is from a family of valves called quarter turn valves. It’s name is come from butterfly type structure. The “butterfly” is a metal disc (normal, though now we have plastic valve or other non metal material valve)mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is open, the disc is rotated a quarter turn so that it allows unrestricted passage. The position of the disc is effected from outside the valve.
Butterfly valves are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support is required. The disc is positioned in the center of the pipe, passing through the disc is a rod connected to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow.
There are different kinds of butterfly valves, each adapted for different pressures and different usage. SGV, from china, divided mainly two kinds of valve.The resilient butterfly valve, which uses the flexibility of rubber or Tefelon ,PFA, NYLON, has the lowest pressure rating. They are usually center disc design. Typically used for low pressure, normal temeprature condition.
Usually, the other type is metal seated butterfly valve, often appear with double eccentric design or triple offset design. It is developed from tradional center line butterfly valve. Somebody call it high performance butterfly valve, used in slightly higher-pressure systems, features a slight offset in the way the disc is positioned, which increases the valve’s sealing ability and decreases its tendency to wear. The valve best suited for high-pressure systems is the tricentric butterfly valve, which makes use of a metal seat, and is therefore able to withstand a greater amount of pressure, high temperature, corrosive and aggressive chemicals. So-called “High Performance” butterfly valves which offer zero leakage designs and have been applied in both the chemicals and hydrocarbon processing sectors.
Butr some valve manufacturer or supplier also call eccentric PTFE or RPTFE seat butterfly valve as high performance butterfly valve.Like Nibco from American, www.nibco.com
Also there are many other Europe or america butterfly manufacturer and supplier has their own description or definition for high performance butterfly valve.
CRANE from American www.craneco.com
Masoneilan* High Performance Butterfly Control Valves from GE energy , www.ge-energy.com
The high performance butterfly valve delivers heavy-duty, automatic throttling control flow for applications involving large flow rates and moderate pressure drops. It incorporates the two basic features of the high performance butterfly valve types: a PTFE, RTFE, or metal seal ring instead of a liner and double offset (eccentric operation) to reduce seal friction and operating torque and provide superior performance compared to conventional butterfly valves.
High Performance Butterfly Control Valves from GWC Valve International, Inc. www.gwcvalve.com
GWC Double Offset High Performance Butterfly valves are designed for shutoff and throttling control of liquids and gas.
EBRO-armaturen from German
Wafer type butterfly valve in double-eccentric construction. Reliable sealing even with extreme temperature and pressure conditions.
ADMAS triple eccentric butterfly valve from German www.ad mas-armaturen.de
The first triple eccentric metal seat butterfly valve manufacturer.
Usually these words are used for to descript high performance butterfly valve:High performance, low friction, low torque, metal seat(sometimes PTFE or RPTFE seat), eccentric design, long service life, suitable for aggressive condition, high cost performance, bi-directional. There is no words to digital or data to definie what is a high performance butterfly valve. It is no apparent differences between high performance butterfly valve and normal metal eccentric butterfly valve.
So is there any diferences between high performance butterfly valve and normal metal eccentric butterfly valve? Usuallly high performance butterfly valve is machined by CNC machine with high accurancy, especially some trim parts. It require better quality control and material class. Many valve experts think the valve should reach some degree service life. For example, pass 1 million times open close service life test.
In a word, high performance butterfly valve is a word people descrip valve with very good quality for high requirement application.