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Axial Flow Check Valves
Axial flow check valves direct fluid along the axis of the valve body to produce straight-through, non-turbulent flow. Benefits include:

Compact, lightweight, and streamlined design
Low pressure loss due to smooth, efficient flow path
Can handle high flow velocities and high pressure
Straight-through closure minimizes slam and water hammer effect
Minimal cavitation and turbulence compared to swing checks
Axial checks are ideal for applications requiring minimal flow restriction.

China Lift Check Valves
Originating in China, lift checks contain a ball or disc attached to a hinge. When open, flow lifts the disc to allow passage through the valve. Benefits:

Can be installed horizontally or vertically-effective for low pressure systems with vertical flow
Handle water, sewage, oil, and some chemicals
Simple construction with only one moving part
Low cost compared to other check types
Lift checks suit low pressure drainage and pumping applications.

Dual Disc Check Valves
Dual disc models have two hinged discs that seal against seats in opposite directions. Key features:

Tight shutoff with two sealing surfaces
Low leakage and slam potential
Handles high pressure, high temperature, and abrasive fluids
Suitable for large pipe diameters
Discs can seal even on very low back pressure
Provides redundancy if one disc fails
Dual disc checks are ideal for severe service conditions.

Evaluating Check Options
Consider fluid properties, pressure, flow, line sizes, installation factors, and operating conditions when selecting the optimal check valve. Consult manufacturers to pick the right model for each application need.