The ZPR820 metal sealing eccentric butterfly valve (with soft seal or metal seal options) is a new type of butterfly valve designed by integrating the advantages of several different structural butterfly valves. It adopts a double-eccentric butterfly disc with a spherical sealing surface, matched with a single-piece sealing seat, making it suitable for occasions requiring reliable sealing and regulatory characteristics.
Thanks to the double-eccentric design of the butterfly disc, the valve features tight sealing performance and an ultra-long service life. It can be used for quick shut-off or flow regulation. The product is applicable to the transportation of liquids and gases (including steam) in various industrial pipelines. With the advantages of small volume, light weight, a wide manufacturing range, and easy maintenance.
Due to the adoption of the 3D eccentricity principle in this butterfly valve, the spatial movement trajectory of the sealing surfaces is optimized. There is no friction or interference between the sealing surfaces, and combined with the appropriate selection of sealing materials, the butterfly valve achieves reliable sealing performance, corrosion resistance,high-temperature resistance, and wear resistance.
The ZPR820 high-performance butterfly valve, when paired with an electric valve positioner, can be controlled by inputting a 4~20mA DC signal and a 0.4~0.7MPa air supply, enabling regulation of parameters such as pressure, flow rate, temperature, and liquid level. When equipped with a solenoid valve, limit switch, pressure-reducing valve, and a 0.4-0.7MPa air supply, the valve can achieve on-off operations and output two pairs of passive contact signals to indicate the valve's open/close status.
| Body Type | Wafer-Type/Flange Type | |
| Size | DN50~DN1200 | |
| D & M Std. | API 609 | |
| F2F Std. | GB/T12221 (Short-Body Series) | |
| PT & I Std. | GB/T13927, AP1598 | |
| Conn. Std. | End | Wafer-Type / Flange Type |
| Flange Sealing Face | RF, FM/M, T/G, FF | |
| HG/T20592-2009 | PN10,PN16,PN25 | |
| ASME B16.5 | 150LB | |
| Sealing Type | Seat Type | Soft Seat |
| Stem Sealing Type | Sleeve Packing | |
| Materials | Body/Bonnet Material | WCB, LCB, SS304, SS316L |
| Disc Material | WCB, F304, F316L | |
| Seat Material | SS304+PTFE or Graphite; Hard Alloy | |
| Stem Material | 17-4PH | |
| Technical Parameters | Temperature Range | -30℃～160℃ |
| Flow Characteristic | Equal percentage (EQ%)/ Linear (LIN)/ Quick opening (QO) | |
| Leakage Level | IEC 60534-4, ANSI FCI 70-2, ASME B16.104 | |
| Rangeability | 100：1 | |
| Basic Error | W/pos.≤±2% | |
| Hysteresis Error | w/pos.≤2% | |
| Accessories | Actuator | Pneumatic Actuator ZP7000 Series Electric Actuator ZP9000 Series |
| Main Accessories | Solenoid Valve, Limit Switch, Positioner, Air Filter Regulator | |
| Others | Manual Mechanism, Dump Valve, Air-Controlled Valve, Lock-up valve | |
| Features | Description |
| Multi-Eccentric Structure | The eccentric design significantly eliminates scraping between the disc and seat, reducing wear and extending seat service life. |
| Wide Compatibility | The design prevents particle accumulation during fluid flow erosion while maintaining reliable shut-off performance. |
| High-Temperature Resistance | Configurable with metal seats or composite seats (elastomer + metal), supporting fire-safe design (achieving ANSI-B10.4 Class IV sealing at high temperatures). |
| Superior Sealing | Mechanical compression sealing design, replacing traditional reliance on elastic seat deformation. |
| Wide Operating Range | Applicable Temperature: -253~ +815, Pressure Rating: 150Lb～ 2500Lb, suitable for applications in water plants, power plants, chemical pipelines, etc. |
| Low Operating Torque | The eccentric design structure ensures lower operating torque compared to other valve types. |
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