Introduction:
Cast soft seated trunnion ball valves are indispensable components in various industries requiring reliable flow control and tight sealing, such as water supply, HVAC, chemical processing, and general industrial applications. These valves feature a robust cast construction with soft sealing materials to ensure optimal performance and minimal leakage.
Features:
1. Cast Construction: Cast soft seated trunnion ball valves are manufactured using high-quality materials such as cast iron, ductile iron, or cast steel, providing excellent strength and durability.
2. Soft Seating Materials: The valve seats and seals are made from soft materials such as PTFE (polytetrafluoroethylene), EPDM (ethylene propylene diene monomer), or Viton, offering superior sealing performance and resilience to various fluids and temperatures.
3. Full Port Design: Many cast soft seated trunnion ball valves feature a full port design, minimizing flow restrictions and maximizing flow capacity through the valve.
4. Blowout-Proof Stem: The valve stem is designed to prevent blowout under high pressure, ensuring the integrity of the sealing system and preventing fluid leakage.
5. Low Torque Operation: Despite their robust construction, cast soft seated trunnion ball valves are designed for low torque operation, enabling smooth and effortless valve operation.
6. Anti-static Device: Some valves are equipped with anti-static devices to prevent static electricity buildup, reducing the risk of ignition in flammable or explosive environments.
7. Flanged or Threaded Connections: These valves are available with flanged or threaded end connections for easy installation and connection to piping systems.
8. Fire Safe Design: Certain valves are designed to meet fire safety standards, incorporating fire-safe seals and materials that withstand high temperatures.
Working Principle:
1. Shut-off Operation: When the valve is closed, the trunnion ball rotates to a position perpendicular to the flow direction, creating a tight seal against the soft valve seats. This prevents fluid flow through the valve, effectively shutting off the flow.
2. Flow Control: By rotating the valve handle or actuator, the trunnion ball can be positioned to modulate flow rates through the valve. Partial opening of the valve allows for controlled fluid flow while maintaining pressure integrity.
3. Pressure Resistance: The robust construction and soft sealing materials used in these valves enable them to withstand high-pressure environments without compromising sealing performance or structural integrity.
4. Maintenance: Cast soft seated trunnion ball valves require minimal maintenance due to their durable construction and resilient soft sealing materials. Periodic inspections and lubrication of moving parts may be necessary to ensure optimal performance and longevity.
Applications:
1. Water Supply: Cast soft seated trunnion ball valves are commonly used in water distribution networks, water treatment plants, and municipal water supply systems for flow control and shut-off applications.
2. HVAC Systems: These valves find applications in heating, ventilation, and air conditioning (HVAC) systems for controlling the flow of chilled water, hot water, and refrigerants.
3. Chemical Processing: Cast soft seated trunnion ball valves are employed in chemical processing plants for regulating the flow of various chemicals, acids, and corrosive fluids in manufacturing processes.
4. General Industrial Applications: These valves are used in a wide range of industrial applications requiring reliable flow control and tight sealing, including power generation, food and beverage processing, and pharmaceutical manufacturing.
