There are two types of spring-return type single-acting air cylinders, a 2-way type for opening and closing the flow path in hydraulic systems and a 3-way type for switching the flow path.
| Appearance | Model Number | Size | Number of Ports/Function |
 |
PPW1214 | DN32 | 2-way, Normally Closed (NC) Balanced type |
 |
PPW2214 | DN20 | 2-way, Normally Closed (NC) Balanced type |
|
PPW1314 | DN20 | 3-way |
|
PPW1314 | DN32 | 3-way Balanced type |
|
PPW2314 | DN20 | 3-way Balanced type |
