Feed Check Valves are critical safety and control components used in boiler and heater process pipelines. Their primary function is to regulate and control the flow of feedwater into the boiler drum or heater coil, while preventing backflow from the boiler to the feed line. These valves are designed to withstand high pressure and temperature conditions, ensuring safe and efficient boiler operation. Typically mounted at the boiler shell, the valve automatically prevents reverse flow when the pump is stopped or pressure falls, thus protecting pumps, piping, and the boiler itself.
Constructed from robust materials such as cast steel, forged steel, or alloy steels, feed check valves ensure long service life under thermal and pressure cycling. They are available in bolted bonnet or pressure seal types, with options for swing check or lift check mechanisms depending on service requirements. Precision-machined seating surfaces and guided disc arrangements guarantee leak-tight sealing and reliable operation under varying load conditions.
Feed check valves are indispensable in modern boiler systems, contributing to system safety, process reliability, and energy efficiency.
Technical Highlights
-
Function: Controls and regulates feedwater entry into boilers/heaters and prevents backflow.
-
Design Standards: Manufactured as per ASME, BS, or DIN standards.
-
Size Range: Typically available from 25 mm to 300 mm NB (custom sizes available).
-
Pressure Rating: Designed for Class 150 to Class 2500 or equivalent PN ratings.
-
Temperature Range: Suitable for high-temperature service up to 500°C (depending on material selection).
-
Body Material: Cast Steel, Forged Steel, Alloy Steel, Stainless Steel (based on service conditions).
-
Trim Material: Hardened Stainless Steel / Stellited trim for wear and corrosion resistance.
-
End Connections: Flanged (RF/RTJ), Butt Weld, or Socket Weld.
-
Bonnet Type: Bolted Bonnet / Pressure Seal Bonnet.
-
Seating Arrangement: Renewable or integral seat, precision lapped for zero leakage.
-
Disc Design: Guided lift type or swing type for smooth operation and non-slam performance.
-
Operation: Non-return automatic function; can also be supplied with a manually operated isolating screw-down arrangement.
-
Applications:
-
Boiler feedwater inlet lines
-
Heater feedwater lines
-
High-pressure and supercritical boiler systems
-
Process piping in power plants, refineries, petrochemical plants
