The performance of a valve ball directly dictates the sensitivity, accuracy, and reliability of the entire valve. The ball’s effective density—considering its hollow structure and material—must be precisely calibrated to be less than the fluid it controls. It must sink adequately to follow falling levels but remain buoyant enough to rise reliably. Balls are often designed for specific fluids (e.g., water, oil) or ranges of specific gravities.
The valve ball must withstand constant movement, potential impacts with tank walls, and prolonged fluid exposure without corroding, denting, or cracking. A dented or distorted ball loses buoyancy precision and can jam the valve mechanism.
Most metal balls are hollow to achieve necessary low density. Solid polymer balls are common, as polymers typically have lower density than water. 316L stainless steel or Hastelloy-coated metal balls are used for aggressive or high-temperature chemical services.
