Vertical Lift Check Valve for Downward Flow

The provided text describes a standard Lift Type Check Valve, where the closing action is assisted by a spring. While this type is versatile, the critical application note is often related to installation direction, specifically on vertical lines.

⚙️ Vertical Lift Check Valve Overview

The Lift Check Valve is an automatic valve used to control the unidirectional flow of media in a pipeline, preventing dangerous backflow.

Normal State: The valve disc/plug is normally held in the closed position by the spring force.
Opening: The valve opens when the pressure of the medium at the inlet overcomes the resistance of the spring, lifting the valve plug/disc off its seat.
Closing: The valve closes automatically when the inlet pressure drops below the outlet pressure. The spring force pushes the valve plug back onto the seat, stopping the medium from reversing its flow.

⭐ Key Operational Principle

This type of check valve is known for its quick response and reliable tight shut-off, largely due to the supplementary spring assist, which ensures rapid seating and minimizes the risk of water hammer.

🏭 Installation Notes (Installation Precautions)

Support: Do not allow the check valve to bear the weight of the pipeline. Large check valves should be independently supported to ensure they are not affected by stresses generated by the pipe system.
Flow Direction: During installation, ensure the direction of medium flow is consistent with the arrow marked on the valve body.
Installation Orientation: This type of spring-assisted lift check valve offers installation flexibility:
- It can be installed on vertical pipelines (where the flow direction is usually upwards to assist gravity in opening, though spring assist allows more flexibility).
- It can also be installed on horizontal pipelines.