Check valves operate automatically to prevent reverse flow. They are essential in pump discharge, water treatment, marine, HVAC and process piping systems. The best design is not determined by size alone: flow velocity, cracking pressure, installation orientation and surge conditions can all affect performance.
Common check valve types
| Type | Typical strengths | Selection notes |
|---|---|---|
| Swing check valve | Simple design for many water and industrial pipeline duties | Confirm installation direction, disc travel space and suitability for pulsating flow |
| Lift check valve | Suitable for applications with stable flow and compatible body/seat construction | Consider pressure drop and manufacturer orientation requirements |
| Dual-plate check valve | Compact face-to-face dimension and relatively fast closing | Useful where space is limited or reverse-flow effects need attention |
| Wafer check valve | Lightweight installation between flanges | Verify flange standard, pressure class and disc/seat material |
Key selection factors
- Medium, solids content, corrosion potential and temperature
- Pipe size, connection standard, pressure class and flow direction
- Minimum and maximum flow: insufficient flow can cause unstable disc movement
- Cracking pressure and required shutoff performance
- Water hammer, pump start/stop behaviour and closing speed
- Horizontal or vertical installation orientation
- Body, disc and seat material; marine or project certification requirements
Check valves for pump discharge lines
A check valve is often installed immediately downstream of a pump to prevent reverse rotation and backflow after shutdown. In these applications, examine the pump curve, line velocity and potential surge. A compact dual-plate or nozzle-style design may be considered where rapid response is required; a swing check can be appropriate when the system design supports it.
Ask for a matched check valve quotation
Send the medium, line size, flow rate, pressure, temperature, pipe orientation and flange standard. Jinkon can recommend a check valve configuration and provide technical documentation for industrial and marine projects.