Differences in structural design
| Terms | swing check valve | Globe check valve |
|---|---|---|
| core structure | The valve rotates around the pin and has a disc or gate-like structure. | Integration of globe valve and check valve structure, the valve stem and valve flap non-fixed connection (can be lifted and separated), both the mandatory sealing parts of the globe valve. |
| Sealing method | Relying on the self-weight of the valve flap or spring-assisted seat sealing when the medium flows in the opposite direction. | Forced sealing by stem down pressure in shut-off mode, automatic sealing by medium pressure or spring reset in check mode |
| Mounting direction restriction | Supports horizontal, vertical or inclined mounting (vertical mounting requires bottom-up flow of media) | Normally only horizontal installation is permitted, some models need to be installed in the direction of the valve body marking |
Comparison of functional characteristics
| Feature | swing check valve | Globe check valve |
|---|---|---|
| Core Function | One-way flow control only, automatically prevents backflow of media | Dual function: ① Globe valve mode (manual forced cut-off of medium) ② Check valve mode (automatic backflow prevention) |
| Flow regulation capability | No adjustment function, only support fully open or fully closed state | Flow control in shut-off mode with stem-adjustable valve opening |
| Sealing performance | Relatively weak sealing, not suitable for high-pressure differential or high-precision sealing scenarios | Forced sealing in shut-off mode for more reliable sealing up to ANSI Class VI |
| Fluid resistance | Streamlined flow path with low drag coefficient (0.5-0.7) | Valve body structure is similar to the globe valve, the flow path is more curved, higher resistance coefficient (1.5-2.5) |
The difference between application scenarios
| Applications | Swing Check Valves | Globe check valves |
|---|---|---|
| Applicable working conditions | Large calibre (DN ≥ 50mm), low pressure drop, stable medium flow without manual intervention of the pipeline | Where manual intervention is required to cut off or regulate flow (e.g. pump outlet service isolation), or in backflow prevention scenarios where high sealing is required |
| Typical areas | Municipal water supply and drainage, petroleum pipelines, low-pressure steam systems | Chemical plants, ship pipelines, the need for frequent opening and closing of industrial pumps export pipeline |
| restrictive condition | Not suitable for pulsating flow or frequent opening and closing conditions | Restricted by the structure, can not be used for high differential pressure or oversized calibre pipeline (generally ≤ DN300) |
Comparison of Performance Parameters
| Parameters | Swing Check Valves | Globe check valves |
|---|---|---|
| Applicable pressure | PN10-PN420(Up to 42MPa) | PN16-PN100(Restricted by shut-off valve structure) |
| Applicable temperature | -196°C to 800°C (depending on the material) | -29°C to 425°C (subject to sealing materials) |
| Calibre range | DN50-DN2000(even bigger) | DN15-DN300 |