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What is the magnetic permeability of a metal? Materials such as iron, nickel, and manganese have high magnetic permeability. μ=magnetic permeability of material (Henrys/meter) μ is called the permeability of a magnetic material. The permeability of vacuum is defined as μ o, with a value of 4 π x10 ^ -7H/m. The permeability of other substances relative to vacuum is called relative permeability. Relative permeability can be used to evaluate the ease of magnetization of a magnetic material, such as steel commonly used in motor manufacturing, with a relative permeability between 2000 and 6000. This means that for the same current, if a silicon steel sheet is used as the iron core, a hollow coil can produce 2000 to 6000 times the magnetic flux. The permeability of air is almost the same as that of vacuum. It can be inferred that the material of transformer or motor iron core plays a crucial role in its characteristics.

2. Abbreviations for valves such as rov and bv, can someone provide me with a systematic copy?

1. Angle Stop Valves 2 Angle Throttle Valves 3 Angle Type Globe Valves 4 Butterfly Type Non slam Check Butterfly Buffer Check Valve 5 Butterfly Valves with Gear Actuator 6. Cock Two way 7. CQ Thread Ball Valves 8. Diaphragm Valves 9. Double Disc Flat Gate Valves 10. Double Disk Parallel Gate Valves 11 Double Opening Exhaust Valves Double Port Balloon 12 Electric Activated Stop Valves 13 Electric Activated Wedge Gate Valves 14. Electric Double Disk Parallel Gate Valves 15. Electric Parallel Gate Valves 15 Emergency Cut off Valves 16. Free Float Type Steam Trap 17. Flange Ball Valves 18. Flange Gate Valves 19. Flange Globe Valves 20 Gauge Valves 21. Hard Seal Butterfly Valves 22. Metal sealed disc valves High Temperature Pressure Power Station Gate Valves 23. High Temperature Pressure Power Station Globe Valves 24. High Temperature Pressure Power Station Globe Valves 24 Lift Check Valves 25. Lining Ball Valves 26. Lining Butterfly Valves 27 Lining Check Valve Lining Check Valve 28. Lining Cock Lining Two way 29. Lining Globe Valve Lining Stop Valve 30 Lining T-Cock Valves lined three-way plug valve 31. Liquid Indicator level gauge 32. LPG Pipe Fitting liquefied gas pipe fittings 33. Magnetic Co operating Globe Valves magnetic coupling globe valve 34 Magnetism Forle Pumps 35. Manual Oil Pumps Valves 36. Hand cranked oil pumps (valves) Meter Needle Type Globe Valves 37 Oblique Stop Valves DC globe valve 38 Parallesl Slide Valves Slurry Valve 39 Piping Centrifugal Pumps 40. Piping Pumps 41. Piping Safety Valves 42. Piping Safety Valves 42. Plunger Globe Valves 43 Quack Check Valves Micro resistance Slow closing Check Valve 44. Under Water Pumps 45. Vacuum Pumps Hydraulic Jet Nohao Lead (Vacuum Pump) 46 Vertical Lift Check Valves 47. Wafer Check Valves 48. Wafer Type Butterfly Valves with Rubber Itning 48. Waste Valves Drain Tank (Valve) 50 Water Seal Gate Valves 51. Wedge Gate Valves 52. Y Type and Cylinder Filters 53. Non return valve check valves; Check valve; 54. Check valve discharge back pressure 55. Brilt up back pressure discharge pressure 56. Relieving pressure ash discharge valve 57. Ash valve displacement coefficient 58. Coefficient of discharge exhaust valve 59. Air release valve 60. Exhaust valve 61. Vent valve drainage valve 62. Drainage valve drainage temperature 63. Temperature at discharging condition inlet isolation valve 64. suction isolation valve plug 65. Plug three-way valve 66. three-way isolation

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