Nickel Aluminum Bronze Triple Eccentric Butterfly Valve D343W/D343F

D641H/D642H/D643H pneumatic triple eccentric hard seal butterfly valve is widely used in power plant heating systems, catalytic cracking main fan duct systems, as well as industrial systems such as steel, metallurgy, and chemical industry, as well as environmental protection, water treatment, and high-rise building water supply and drainage pipelines to cut off or regulate flow. The pneumatic valve design adopts the triple eccentric principle, which separates when opening the seal and seals when closing the contact. Therefore, the sealing performance is reliable, and the sealing ring is made of stainless steel material, Under high temperature and cold working conditions, the seal has the characteristics of no stress deformation, high temperature resistance, corrosion resistance, and long service life. The axial positioning device of the valve solves the problem of wear and leakage of the axial sealing surface. The transmission device can be installed in any direction, with large flow area, small flow resistance coefficient, strong flow capacity, anti-aging, radiation resistance, and durability. Sealed and adjustable, with a lifespan of 100000 cycles without leakage.

Execution standards:
Design and manufacturing: GB/T12238
Structural length: GB12221-2005
Supply requirements: GB/T12252-2005
Pressure test: GB/T13927-2008
Pressure testing and inspection: GB/T13927-1992
Flange standard: GB/T9119-2010

Product features:

1. The metal hard sealed butterfly valve adopts a triple eccentric sealing structure, with almost no wear on the valve seat and butterfly plate, and has a sealing function that becomes tighter and tighter as it becomes more visible.
2. The sealing surface of the butterfly plate is made of cobalt based hard alloy by overlay welding, which is wear-resistant and has a long service life.
3. The sealing ring is made of stainless steel, which has the dual advantages of metal hard sealing and elastic sealing. It has excellent sealing performance in both low and high temperature conditions, corrosion resistance, and long service life.
4. The large-sized butterfly plate adopts a quilted frame structure, which has high strength, large over current area, and low flow resistance.
5. The metal hard sealed butterfly valve has a bi-directional sealing function, which is not limited by the flow direction of the medium or the influence of spatial position during installation. It can be installed in any direction.
6. The driving device can be installed at multiple workstations (rotating 90°or 180°),making it convenient for users to use.

Main performance parameter:

Main connection size:

Notes on butterfly valve installation:

1. Before installation, the specifications, pressure, temperature, and corrosion resistance of the butterfly valve should be checked to ensure that they meet the requirements for use. Each component should be checked for damage or looseness.
2. This butterfly valve can be installed on pipelines at any angle and should be closed for installation; When welding pipeline flanges, the valve sealing port should be blocked with a plate to prevent particles and debris from damaging the sealing surface. After welding, remove the valve, clean the valve sealing surface and pipeline cavity, and then install and fix the valve.
3. Please pay attention to the pressure direction when installing when the valve is closed.
4. Before installation, the sealing surfaces (sealing surfaces at both ends, butterfly plate sealing surfaces, and valve seat sealing surfaces) should be thoroughly wiped clean to remove dust and dirt.
5. Before installation, the butterfly valve should be air tested, with flexible opening and closing, and the opening and closing positions should match the indicated positions of the pointer.
6. Manually operate clockwise to close and counterclockwise to open. Do not apply force to open or close the valve after the pointer indicates it is in place.
7. When conducting pressure tests on valves, it is not allowed to use a single flange for installation and pressure testing. Double flange installation and pressure testing must be used. The test pressure should comply with the provisions of GB/T13927-92 standard.
8. When tightening bolts, they should be tightened symmetrically and alternately, and individual tightening in sequence is not allowed.
9. The limit screw has been adjusted before leaving the factory and should not be easily adjusted. If the drive device is configured as electric or pneumatic, please refer to the accompanying drive device manual.
10. The opening and closing stroke of the control mechanism has been adjusted when the electric butterfly valve leaves the factory. To prevent incorrect direction when the power is turned on, the user should manually turn it on to the half open position before the first power connection, then press the jog switch, and check that the direction of the indicator panel is consistent with the direction of the valve opening.
11. If the valve is found to have abnormal opening and closing, the cause should be identified for repair and elimination to prevent damage to the valve caused by using force to open and close the valve.