Check Valve Features, Applications & Design Trends
Check valves, also known as non-return valves, are crucial components in industrial pipelines. They automatically allow flow in one direction and prevent backflow, ensuring system safety and efficiency.
Key Features of Check Valves
Advantages
Compact Size: Ideal for limited space installations
Lightweight: Easier handling and reduced transportation cost
Simple Construction: Minimal parts mean lower maintenance frequency and cost
Disadvantages
Fragile Disc: The disc is prone to damage under high pressure or flow fluctuation
Risk of Backflow: If the sealing surface is compromised, reverse flow can occur, leading to operational hazards
Application Scope
Check valves are used anywhere backflow prevention is critical. These include:
Water treatment and distribution systems
Oil and gas pipelines
Boiler and steam systems
Chemical processing plants
Fire protection systems
Common Specifications (China Standards):
Nominal Diameter (DN): 10–1800 mm
Nominal Pressure (PN): 0.25–32 MPa
Operating Temperature: Up to 550°C
Advanced Design: Damped Swing Check Valves
To reduce hydraulic shock and noise caused by abrupt closure, swing check valves are often equipped with hydraulic damping mechanisms and counterweights.
Benefits:
Smooth closure without water hammer
Reduced wear on moving parts
Extended service life of the valve and connected equipment
Emerging Trend:
Large-diameter swing check valves are increasingly being replaced by balanced butterfly-type check valves, which offer:
Faster operation
Lower flow resistance
Improved sealing performance
OEM Sand Casting for Check Valves
At EATHU, we specialize in OEM-only casting solutions for industrial valve components.
Materials We Cast:
Gray Iron (HT200 / HT250)
Ductile Iron (QT400–QT500)
Carbon Steel (WCB)
Stainless Steel (CF8 / CF8M)
OEM Capabilities:
OEM production based on client drawings
CNC machining of sealing surfaces
100% hydrostatic pressure testing before delivery
Epoxy, paint, or zinc surface coatings available
Strict quality control for EU and Middle East market compliance
