KR VAVLE
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| Valve Type: | Flange butterfly valve | Structure: | Eccentric |
| Standard: | API/EN/JIS | Workmanship: | Investment casting |
| Sealing direction: | Bidirectional | Sealing grade: | Zero leakage |
| Temperature: | -190°C < T < 700°C | Operation: | Handle |
This pneumatic flanged metal-to-metal butterfly valve features hard alloy overlay sealing between disc and seat plus triple eccentric design for friction-free operation and self-tightening bidirectional zero leakage. With solid integrated flanged body and rack-and-pinion pneumatic actuator available in double or spring return type, it can be fitted with solenoid valves and positioners for remote automatic control. Its streamlined disc brings low flow resistance and large flow capacity, delivering outstanding resistance to high temperature and particle abrasion for severe service pipelines.
Metal-to-metal hard alloy seal resists high temperature and particle erosion, avoiding rubber aging and prolonging service life greatly.
Triple eccentric friction-free design realizes self-tightening sealing, achieving reliable bidirectional zero leakage at high differential pressure.
Robust flanged connection is vibration-proof; pneumatic actuator provides explosion-proof quick operation and convenient remote control with low maintenance cost.
Rack & pinion actuator realizes 90° quick on/off within 1~5s; spring return(air fail close) or double acting available, fitted with solenoid/positioner for remote cut-off and modulating control.
Standard export wooden case packaging is used to ensure the safety of the valve during international transit.
The single acting pneumatic hard seal butterfly valve is mainly used for municipal heating steam, power plant flue gas & desulfurization duct, metallurgical furnace hot air pipe, petrochemical thermal oil & fuel gas line, industrial wastewater and exhaust treatment system.
| Part name | Material |
|---|---|
| Valve body | WCB, QT450-10, Q235, Alloy steel, stainless steel, etc. |
| Valve stem | Alloy steel, stainless steel |
| Seal ring | Stainless steel composite multi-level |
| Packing | Flexible graphite or stuffing |
| Valve seat | Stainless steel, cobalt based hard alloy |
| Valve stem (Lower) | Stainless steel |
| PN (MPa) | DN (mm) | L | D | D1 | D2 | Z-Φd | b | f | H | H0 | A | B |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.0 | 150 | 140 | 285 | 240 | 211 | 8-Φ22 | 24 | 2 | 385 | 230 | 66 | 150 |
| 1.0 | 200 | 152 | 340 | 295 | 266 | 8-Φ22 | 24 | 2 | 471 | 297 | 85 | 170 |
| 1.0 | 300 | 178 | 445 | 400 | 370 | 12-Φ22 | 26 | 2 | 606 | 364 | 106 | 205 |
| 1.6 | 150 | 140 | 285 | 240 | 211 | 8-Φ22 | 24 | 2 | 385 | 230 | 66 | 150 |
| 1.6 | 300 | 178 | 445 | 400 | 370 | 12-Φ22 | 32 | 2 | 606 | 364 | 106 | 205 |
| 1.6 | 600 | 267 | 780 | 725 | 582 | 20-Φ30 | 44 | 5 | 1048 | 590 | 198 | 324 |
The triple eccentric design ensures friction-free operation between the disc and the seat, which significantly reduces wear and allows for a self-tightening seal, ensuring zero leakage even in high-pressure applications.
Yes, with its metal-to-metal hard alloy sealing and robust construction, it can handle temperatures ranging from -190°C up to 700°C, making it ideal for municipal heating steam and thermal oil lines.
We provide rack-and-pinion pneumatic actuators in both double-acting and spring-return (single-acting) types. Spring-return models offer a fail-safe "air fail close" feature.
Yes, the valve is designed for bidirectional sealing, providing reliable shutoff regardless of the flow direction in the pipeline.
The rack & pinion actuator allows for quick 90° on/off cycles, typically ranging from 1 to 5 seconds, which is essential for emergency cut-off or fast process control.
The valves are manufactured according to international standards such as API, EN, and JIS, ensuring compatibility and quality for global industrial projects.
