Multi-spring diaphragm pneumatic actuators type P1/R1 are used as control devices for control of control valves and other setting elements in industrial automation.

They are made in the following varieties:

• simple action (air – stem extension) – type P1
• reverse action (air – reverses the stem) – type R1
• simple operation, with manual drive – type P1B
• reverse action, with manual drive – type R1B