_.png)
.png)
Nakakita NS-777C Viscosity Controller
Nakakita Seisakusho Co., Ltd.
Refurbished
Nakakita NS-777C Viscosity Controller (Complete Set) – Manual, Calibration, Repair, Spare Parts & Marine Supplier | SM MARINE SERVICE™
Nakakita Seisakusho Co., Ltd.
Japan
Marine Fuel Oil Viscosity Controller (Complete Set)
Main Engine Heavy Fuel Oil (HFO) Heating & Viscosity Control System
The Nakakita NS-777C Viscosity Controller is a precision marine automation instrument designed to maintain the correct viscosity of heavy fuel oil before it enters the main engine fuel injection system. By continuously monitoring fuel oil viscosity and controlling the steam or thermal oil heating valve, the controller ensures optimum fuel atomization, stable combustion, improved engine efficiency, and reduced fuel consumption.
Heavy fuel oil becomes more viscous at lower temperatures. If the viscosity is not maintained within the engine manufacturer's recommended range, combustion quality deteriorates, injector wear increases, and engine performance suffers. The NS-777C automatically compensates for viscosity changes by adjusting the heating medium, ensuring the fuel reaches the engine at the proper viscosity.
SM MARINE SERVICE™ supplies complete Nakakita NS-777C viscosity controller systems, control units, viscosity sensors, capillary assemblies, pneumatic controllers, spare parts, repair services, calibration, and worldwide technical support.
A marine viscosity controller automatically regulates the temperature of heavy fuel oil to achieve the required viscosity specified by the engine manufacturer.
Instead of directly controlling temperature, the controller measures viscosity (cSt) and adjusts the heating valve to maintain the desired fuel condition. This approach provides more accurate fuel quality control than temperature-only regulation.
The NS-777C continuously measures viscosity, compares it with the preset value, and proportionally controls the steam control valve or thermal oil valve to stabilize the fuel supply.
The Nakakita NS-777C operates using a continuous feedback control loop:
This automatic regulation ensures consistent fuel injection characteristics and efficient engine operation.
A complete Nakakita NS-777C system typically consists of:
| Item | Specification |
|---|---|
| Manufacturer | Nakakita Seisakusho Co., Ltd. |
| Model | NS-777C |
| Product Type | Mechanical Viscosity Controller |
| Fuel Type | Heavy Fuel Oil (HFO) |
| Control Method | Proportional Mechanical Control |
| Measurement Unit | cSt (Centistokes) |
| Application | Main Engine Fuel Oil System |
| Installation | Booster Module / Fuel Conditioning Unit |
| Heating Medium | Steam or Thermal Oil |
| Marine Approval | Suitable for Classed Marine Installations |
The Nakakita NS-777C is widely installed on:
Compatible with engines from:
| Problem | Possible Cause | Recommended Action |
|---|---|---|
| Incorrect viscosity | Sensor contamination | Clean measuring chamber |
| Slow response | Capillary blockage | Clean or replace capillary |
| Heating valve not responding | Pneumatic/mechanical linkage fault | Inspect controller output |
| Unstable viscosity | Air leakage or worn linkage | Inspect mechanical components |
| Controller drift | Calibration required | Perform recalibration |
| Fuel overheating | Incorrect set point | Verify controller adjustment |
Routine maintenance should include:
Frequently requested spare parts include:
It automatically maintains the correct heavy fuel oil viscosity before fuel enters the engine injection system.
Yes. Routine calibration can normally be performed onboard according to the manufacturer's maintenance procedure.
Yes. The NS-777C is commonly used with steam-heated fuel oil booster systems and can also be adapted for thermal oil heating arrangements.
Yes. Most mechanical assemblies, gauges, capillary tubes, seals, and control components are serviceable individually.
Yes. We supply new, used, and professionally reconditioned Nakakita NS-777C complete systems, spare parts, repair services, and calibration support.
The Nakakita NS-777C Viscosity Controller (Complete Set) is a precision mechanical controller used to maintain the correct viscosity of heavy fuel oil in marine diesel engine fuel systems. By automatically regulating the heating medium, it ensures optimum fuel atomization, improved combustion efficiency, reduced engine wear, and reliable operation under varying fuel conditions.
Typical technical documents include:
SM MARINE SERVICE™ specializes in marine automation, fuel oil conditioning systems, engine control equipment, and marine spare parts.
We provide:
Bangladesh Office
Samir Market, DT Road, Pahartali, Beside CDA Market, Chattogram, Bangladesh
China Warehouse & Support Center
Shanghai, China
Website
www.smmarineservice.com
Email
info@smmarineservice.com
WhatsApp
+8801818929292
Marketing Contact
Nazmul Hasan Bhuiyan
The Nakakita NS-777C Viscosity Controller (Complete Set) is a highly reliable and proven solution for maintaining the correct viscosity of heavy fuel oil in marine propulsion systems. Its precision mechanical control, durable construction, and dependable performance help optimize fuel combustion, improve engine efficiency, reduce maintenance costs, and protect critical fuel injection components.
Whether you require a complete Nakakita NS-777C Viscosity Controller, viscosity measuring chamber, capillary assembly, mechanical controller, calibration service, repair, or compatible spare parts, SM MARINE SERVICE™ is your trusted partner for professional marine automation solutions, worldwide technical support, and fast global delivery.
0
BDT 0
BDT 0
BDT 0
BDT 0
Marine Equipment Supplier