Heavy Duty Investment Casting Ball Valve

African Valve, a Heavy Duty Investment Casting Ball Valve Supplier in South Africa, supplies investment-cast ball valves for reliable quarter-turn isolation and demanding industrial service. Investment casting can produce valve bodies with accurate dimensions and detailed geometries, while the final valve design, materials, pressure class and manufacturing specifications determine its suitability for a particular application.

These ball valves can be supplied in carbon steel, stainless steel and other alloy materials for different operating conditions. Depending on the configuration, they can be used in oil and gas, petrochemical, chemical processing, mining, power generation, water treatment and general industrial applications.

Engineering Design & Operation 

The valve operates through a 90° rotation of a spherical ball located between two sealing seats. In the fully open position, the bore through the ball aligns with the pipeline, allowing fluid to pass through the valve. Rotating the ball by 90° positions the solid portion across the flow path and shuts off the fluid.

The investment-casting manufacturing process enables complex valve-body geometries to be produced with good dimensional accuracy. Heavy-duty designs can incorporate three-piece construction, reduced or full-bore configurations, blow-out-proof stems, anti-static devices, locking arrangements, soft seats, or metal seats, depending on the application.

Heavy Duty Investment Casting Ball Valve Features

• Investment-cast construction - Provides controlled body geometry and dimensional accuracy.
• Heavy-duty configurations - Available for demanding industrial and process services, subject to the selected design and materials.
• Reliable shut-off - Designed for on/off isolation of compatible process fluids.
• Quarter-turn operation - Allows the valve to be opened or closed through approximately 90 degrees.
• Full and reduced bore - Available to suit different flow and pressure-drop requirements.
• Floating ball options - Commonly used in smaller and medium-sized valve designs, depending on pressure class and manufacturer design.
• Trunnion-mounted options - Available for designs requiring additional ball support, including larger sizes and higher-pressure services.

Technical Specifications

Materials & Components

• Body: ASTM A216 WCB, ASTM A352 LCB, ASTM A351 CF8, CF8M and CF3M, depending on the required service
• Ball: Stainless steel, duplex stainless steel and other suitable alloys
• Stem: AISI 316, AISI 410, 17-4PH and duplex stainless steel options
• Seat: PTFE, RPTFE, TFM, PEEK, nylon or metal seat options, depending on service
• Body Seal: PTFE, graphite or spiral-wound gasket, depending on construction
• Stem Packing: PTFE, graphite or low-emission packing
• Thrust Washer: PTFE, stainless steel or bronze, depending on design
• Bearings: Stainless steel, PTFE-based composite or bronze, where applicable

Testing & Standards

The applicable standards for an investment-cast ball valve depend on its design, pressure rating, end connection, service and project requirements. Standards that may apply include API 608, ISO 17292, ASME B16.34, ASME B16.10 and API 598. For pipeline-service valves designed to the relevant requirements, API 6D or ISO 14313 may also apply.