KFTE Cast Iron Gate Valve is suitable to fit between PN6, PN10/16 or ANSI 150 flanges (subject to configuration) and designed for general purpose, industrial and HVAC applications; hot and cold water heating installations and where a tight shut off is required. KFTE Cast Iron Gate Valve are commonly used for a wide range of applications, including air-conditioning and plumbing in buildings, fire fighting equipment, water and sewer lines and utility systems in various industrial plants.
The highest pressure rating for a cast iron gate valve typically depends on its class and operating temperature. Here’s a structured summary:
Material Considerations:
Cast iron is brittle and generally used in low to medium-pressure applications. It’s less durable under high pressure compared to ductile iron or steel.
Pressure Classes:
1. Class 125: Commonly used for cast iron valves. At ambient temperatures (around 68°F/20°C), these valves can handle pressures up to 200 psi (13.8 bar). However, the pressure rating decreases with increasing temperature (e.g., ~150 psi at 200°F/93°C).
2. Class 250: Less common for cast iron but exists. These valves can handle higher pressures, up to 250 psi (17.2 bar) at ambient temperatures, but are still temperature-dependent.
Temperature Effects:
Cast iron valves are not suitable for high-temperature steam or extreme thermal cycling. Their pressure ratings drop significantly at elevated temperatures (e.g., above 450°F/232°C, cast iron becomes unreliable).
Standards and Applications:
ANSI B16.34 and AWWA standards govern pressure ratings. Cast iron valves are often used in water systems, HVAC, and plumbing where pressures rarely exceed 250 psi.
For high-pressure applications (300+ psi), ductile iron or steel valves are preferred.
1. Water Distribution Systems
Municipal Water Supply: Used for mainline isolation, reservoir control, and pipeline sections. Cast iron handles potable water effectively, especially when lined with epoxy for safety.
Fire Protection Systems: Essential for on/off control in sprinkler systems and hydrants, ensuring reliable operation during emergencies.
2. Wastewater and Sewage Treatment
Sewage Systems: Suitable for non-aggressive wastewater management, though less ideal for highly acidic environments. Used in treatment plants and sewer lines.
3. HVAC Systems
Heating/Cooling Circuits: Controls flow of hot or chilled water in commercial/residential buildings. Suitable for moderate temperatures and pressures typical in HVAC applications.
4. Industrial Applications
General Process Lines: Used in industries like food processing, textiles, and pulp/paper for non-corrosive fluids (e.g., water, steam, oils).
Low-Pressure Steam Systems: Manages low-pressure steam in facilities, avoiding high-temperature/high-pressure scenarios where steel is preferred.
5. Agriculture and Irrigation
Crop Irrigation: Regulates water flow in distribution networks and pump stations, offering cost-effective solutions for large-scale systems.
6. Infrastructure and Plumbing
Commercial/Residential Plumbing: Installed in water mains, boilers, and drainage systems for reliable shut-off.
Legacy Systems: Maintained in older infrastructure due to historical use and compatibility.
7. Mining and Construction
Water Management: Used in dewatering and slurry pipelines, handling abrasive fluids where frequent throttling isn’t required.
Key Considerations
Pressure/Temperature Limits: Best for moderate pressures (typically ≤ 300 psi) and temperatures (up to 200°C). Avoid high-pressure oil/gas or extreme heat.
Corrosion Resistance: Suitable for mildly corrosive environments (e.g., water, sewage) but not for strong acids/bases. Linings (e.g., epoxy) enhance durability.
Material Limitations: Brittle compared to steel; avoid high-vibration or impact-prone areas.
