NAKAKITA positioner NS737D-CR

The NAKAKITA NS737D-CR is a high-performance, cam-type pneumatic positioner engineered to provide accurate and reliable control for double-acting cylinder actuators. Designed to meet the rigorous demands of the maritime and petrochemical industries, this positioner ensures that valve openings precisely match the control signal, effectively neutralizing the effects of friction and pressure fluctuations.

Precision Engineering for Critical Control
This model receives a standard pneumatic input signal of 20–100 kPa (0.2–1.0 kgf/cm²) and modulates the output pressure to drive double-acting cylinders with precision. With a lag and repeatability of less than 1% , it guarantees stable fluid flow and pressure regulation in pipelines. The unit supports a CAM input angle of 60–120° and allows for the selection of linear or equal percentage characteristics via interchangeable cams, enabling perfect matching with the flow dynamics of your control valve.

Versatile and Robust Operation
The NS737D-CR is built to operate within a wide supply pressure range of 1.4–7.0 kgf/cm² (140–700 kPa) and can achieve output pressures up to 1000 kPa to meet the demands of high-pressure actuators. Its design emphasizes efficiency, with a maximum air consumption of approximately 20 Nl/min, reducing air source costs during continuous operation. The direction of action (forward or reverse) can be easily switched in the field, and the unit supports split-range operation for added flexibility.

Durable Design for Harsh Environments
Consistent with NAKAKITA’s reputation in the marine sector, the NS737D-CR is constructed to withstand harsh conditions, including vibration and corrosive atmospheres. It features standard connection ports (PT 1/4 for air supply, PT 1/8 for pressure gauges), allowing for real-time pressure monitoring and simplified maintenance. This makes it an ideal choice for critical applications such as cargo oil systems, ballast water management, and fuel delivery pipelines on vessels .