DN2000 Damper Valve
Pressure level PN6-PN16 (-class150)
Working temperature 20°C-200C
Connection method Clamp, lug, flange, welding
Overview
· The valve plate adopts a three-eccentric structure design. During the 90-degree full stroke operation, there is no friction with the valve seat throughout the process.
· Use torque seal instead of position seal to ensure long-term stability and bidirectional sealing. The optimal leakage level can reach zero leakage.
· Adopting an all-metal sealing structure, the leakage level is higher than the requirements of API598 for metal seal valves.
· The valve seat is made of carbide Stellite 21 surfacing welded on the valve body. The valve can be used in a very wide range of working conditions, ensuring a long service life. At the same time, there is no need to replace the valve seat, and the maintenance cost is low.
· One-piece cast valve body, face-to-face dimensions comply with ISO5752ASME B16.10 and AP1609 requirements. Compared with other valve types, assembly is simpler and more flexible.
· It adopts an all-metal structure without any non-fire-resistant sealing components to achieve intrinsic fire safety. Meets API 607 requirements.
·Three-eccentric structure design, with good circulation capacity and excellent adjustment characteristics.
three eccentric structure
The first eccentricity: the valve stem deviates from the center line of the sealing surface; Second eccentricity: the valve stem is slightly deviated from the centerline of the pipe. These two eccentricities greatly reduce the friction between the valve plate and the valve seat; high-performance butterfly valves are usually designed with these two eccentricities. The third eccentricity: The geometric shape of the butterfly plate is deformed to form an inclined cone structure, which not only utilizes the original cam effect, but also eliminates all friction between the valve seat and the butterfly plate during the 90° stroke, achieving the goal of removing wear and ensuring perfect sealing. Purpose. Due to the vertebral structure design, the valve does not need to be limited during the closing process. The calculation and selection of the contact angle of the triple eccentric structure ensures that the valve will not be stuck. At the same time, the torque sealing feature ensures that the torque required for valve switching remains stable during use, thus ensuring a long service life.
Resilient metal seat
The triple eccentric butterfly valve utilizes an elastic stainless steel sealing ring installed on the valve plate to achieve true zero leakage. Zero leakage is achieved through the elasticity of the valve plate seal. The elasticity of this sealing ring is generated by the radial compression and flexing of the sealing ring when torque is applied to the valve stem. The contact surface between the sealing ring and the valve seat has a "cone-in-cone" structure, and both cones are oblique cones. The contact angle between the sealing ring and the valve seat produces a slight "wedge effect", causing the sealing ring to move softly and radially compress. Due to the uniform contact between the valve seat and the sealing ring and the soft movement of the sealing surface, the periphery of the valve seat is evenly loaded, thereby achieving the tightest cut-off with the minimum torque. The elasticity generated by torque causes the valve to shut off tightly, regardless of flow direction or medium pressure.
product composition
One-piece cast valve body The face-to-face dimensions of the one-piece cast valve body comply with ISO5752, ASME B16.10 and API609 requirements. Compared with other valve types, assembly is simpler and more flexible.
Top connection bracket The top connection bracket adopts ISO5211 standard flange and can be directly connected to various actuators.
Anti-blowout stem The standard outer-block anti-blowout design prevents the valve stem from blowing out and improves the safety of the valve.
Elastic metal sealing ring The elastic metal sealing ring is installed on the valve plate, and the sealing ring retainer is used to press it against the valve plate, which not only ensures the sealing ring is fixed, but also ensures a certain elastic deformation. The sealing ring is positioned by locating pins on its edge, making replacement of the sealing ring easier. The thickened design seal ring retainer is equipped with multiple hexagon socket bolts to compress the seal ring to ensure that the strength of the entire valve plate is more reliable.
Stem packing seal The valve stem packing seal can flexibly adopt a variety of structural forms according to the different working conditions of the media used by the valve. The packing design can meet the low emission requirements. The sealing form has passed the ISO 15848:1Class BH test and AP622 verification, including the flushing device and packing detection device for the packing and bearing. Diffusion leak detection meets the most stringent EPA and TALuft requirements
Metal seal valve seat The metal-sealed valve seat is cladded with Stellite alloy to ensure the durability of the valve in various applications including high temperatures and unclean conditions. Stellite alloy overlay seats are standard on all sizes.
High cycle thrust bearings The high-cycle thrust bearing device firmly presses a high-hardness thrust washer onto the shaft to form a central sliding washer, thereby extending service life.
Stem bearing The long bearing adopts surface hardening treatment to reduce valve stem friction and reduce torque. Suitable for dirty media or polymer working conditions, the bearing protection ring can provide excellent protection for the bearing and extend its life.
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