Simple structure: Few parts, relatively easy to manufacture.
Low flow resistance: When fully open, the flow path is straight, and the ball is fully pushed out, resulting in minimal flow obstruction and low pressure loss.
Good sealing (for clean fluids): In clean fluids, the ball and the valve seat (usually made of plastic such as nylon, PTFE, or metal) form a good linear seal.
No closing shock: The closing process is relatively smooth (compared to swing check valves), with minimal water hammer.
Multi-directional installation: Typically designed for horizontal or vertical installation (with upward flow), providing good adaptability (installation orientation requirements must be strictly adhered to).
High requirements for fluid cleanliness: Solid particles, fibers, and viscous media can easily cause the ball to become stuck and seal, or wear the sealing surface.
Speed of closing response: Relying on backflow of the medium to push the ball back into place, closing may be slightly delayed at low flow rates or when pressure changes slowly (compared to spring-assisted check valves). Weight and Dimensions (Large Diameter): The ball requires space, so large-diameter valves may be larger and heavier.
Low-Pressure Sealing: When system pressure is very low or near zero differential pressure, the sealing effect may not be as good as that of a spring-loaded check valve.
Summary and Selection Recommendations
Cast iron ball check valves are a cost-effective choice, particularly suitable for:
• Relatively clean media such as medium- and low-pressure water, air, and steam (low pressure).
• Large-diameter pipes (the advantages of cast iron).
• Cost-sensitive projects with qualified operating conditions (such as municipal water supply, building water supply and drainage, fire water systems, and HVAC water systems).
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