Spirax Sarco WS4 water seal pot is used with DRV or DEP actuators when the medium temperature exceeds the actuator operating range. WS4-3 is recommended for applications where pressure or load changes rapidly.
Available Models
| Model | Application | Capacity |
|---|
| WS4 | General applications | 1 liter |
| WS4-3 | For rapid pressure or load changes | 3 liters |
Size and Piping Connections
| Connection Type | Model | Inlet Thread | Outlet Thread |
|---|
| Threaded | WS4 | ½” BSP male thread BS 21, ½” NPT male thread | ½” BSP female thread BS 21 with 8 mm compression fitting |
| Threaded | WS4-3 | ½” BSP male thread BS 21, ½” NPT male thread | ½” BSP female thread BS 21 with 8 mm compression fitting |
| Butt-weld | WS4 | DN10 | - |
| Butt-weld | WS4-3 | DN15 | - |
Pressure/Temperature Limits
| Item | Details |
|---|
| Body design conditions | PN25 |
| Maximum design pressure | 25 bar g @ 120 °C |
| Maximum design temperature | 225 °C @ 21 bar g |
| Minimum design temperature | 0 °C |
| Maximum operating saturated steam pressure | 21 bar g |
| Maximum operating temperature | 225 °C @ 21 bar g |
| Minimum operating temperature (Note: consult Spirax Sarco below this operating temperature) | 0 °C |
| Maximum design cold hydraulic test pressure | 40 bar g |
| Note: after internal components are installed, test pressure should not exceed | 25 bar g |
Materials
| No. | Component | Material |
|---|
| 1 | Body | Carbon steel DIN 1614 St W24 |
| 2 | Connector | Steel |
| 3 | Pipe fitting | Galvanized carbon steel |
| 4 | Plug | Steel |
| 5 | Cylinder | Carbon steel DIN 1629 St 52 |
Weight
| Model | Weight (kg) |
|---|
| WS4 | 1.6 |
| WS4-3 | 5.4 |
Available Spare Parts
Component 3 — pipe fitting
Example: 1-WS4 water seal pot, BSP ½” WS4 threaded connection.
