The Neles Easyflow RNP Series opposed-piston rack-and-pinion actuators combine long cycle life, a rugged construction, and an extremely compact and symmetrical design with a unique range of features and options for fast operation of ball, butterfly, and other rotary valves.
RNP Series Rack-and-Pinion Actuator | Neles Easyflow™
Neles Easyflow
RNP Series Pneumatic Rack-and-Pinion Actuator | Neles Easyflow
Pneumatic quarter-turn actuator for rapid operation of rotary valves such as ball and butterfly valves.
- Category
- Actuators
Installation notes
Spring Assembly Maintenance Safety
Before servicing a spring-return actuator, isolate and release the air supply pressure. Do not disassemble a preloaded spring assembly, as the release of stored energy may cause components to eject suddenly and result in personal injury.
Periodic Inspection and Spare Parts Replacement
The actuator should be inspected at least once every 5 years. Replace seals and bearing spares specified by the manufacturer according to the actual model and configuration.
Air Supply Cleanliness and Pressure Limits
The actuator must use clean air as the operating medium. The supply pressure must not exceed the actuator's permitted value to prevent contaminants or excessive pressure from damaging the seals and cylinder.
FAQ
Which valves and control applications are suitable for the Neles Easyflow RNP Series?
The RNP Series comprises pneumatic quarter-turn, double-piston, opposed rack-and-pinion actuators. It is suitable for the rapid operation of ball valves, butterfly valves, and other rotary valves, and can be used for on-off and general control applications. The series provides fast and responsive operation.
Which torque and pressure parameters should be considered when selecting the RNP Series?
The torque range of the RNP Series is 4–5005 Nm, and the maximum operating pressure is 8 bar. During selection, match the torque required by the valve to the actuator specification and verify that the operating pressure is within the permitted range. The series torque range does not mean that a single model covers all torque values.
Which temperature versions are available for the RNP Series, and how should one be selected based on ambient temperature?
The RNP Series is available in standard, high-temperature, and arctic temperature versions. The standard version is suitable for temperatures from -20 °C to +80 °C, the high-temperature version from -20 °C to +125 °C, and the arctic version from -60 °C to +80 °C. Select the appropriate version according to the actual operating temperature. The temperature ranges of different versions must not be combined as the applicable range of a single version.
Which interface standards should be checked when installing the RNP Series with valves and associated accessories?
The installation interface standards listed for the RNP Series include ISO 5211 and VDI/VDE 3845. When combining the actuator with valves and associated accessories, verify the applicable interface standards and specific installation dimensions. Installation compatibility must not be determined solely from the series name.
Does the RNP Series support conversion between single-acting and double-acting configurations?
The RNP Series supports conversion from single-acting to double-acting operation. The series uses a compact, lightweight, modular design with a consistent design across the range and is easy to maintain.