OVAL NPI45B10 (814CC) Valve Open Shunt Indicator

OVAL NPI45B10 (814CC) Valve Open Shunt Indicator

The OVAL NPI45B10 (814CC) is a specialist positive displacement volumetric valve position indicator manufactured by OVAL Corporation. This indicator is based on a high-precision mechanical positive displacement (PD) flowmeter. It detects the specific volume of hydraulic fluid going into or coming out of a valve actuator to display live, precise physical status (OPEN/SHUT).

The NPI45 series is mainly designed for maritime engine rooms, remote freight handling and ballast systems and it works by allowing the main hydraulic flow of the actuator to pass via its internal twin oval rotor assembly. 814cc (cubic centimeters) specifies the exact displaced volume displacement configuration calibrated for this physical indicator’s mechanical gearing ratio.

Model Details

• Manufacturer: OVAL Corporation (Japan)
• Model Number: NPI45B10
• Measurement Capacity: 814cc (C.C.) per designated actuator sweep
• Manufacturer Part Number (MPN): NPI45B10-814CC
• Configuration Type: Passive direct-reading mechanical indication with optional electrical signal microswitches

Compatible Equipment Models

• Hydraulic Actuator Control Blocks: Damcos/Danfoss VPI series cross-compatible systems.
• Marine Remote Control Panels: Nakakita, Nakazato, and OVAL Centralized Loading/Off-Loading Valve Consoles.
• Actuator Cylinders: Linear and rotary double-acting hydraulic actuators with total displacement requirements correlating to the 814cc indicator limits.

Part Number Cross-References

• OVAL NPI45B10 (814CC)
• OVAL PI-45B10-814CC
• N2-22 series volumetric indicators (specific OVAL factory custom build modifications)

Key Features

1. Internal Friction Clutch Mechanism: Automatically compensates for drifting and alignment errors; the internal pointer contacts the mechanical stop at 97% to 100% of the valve sweep, while the clutch handles the remaining 0% to 3% to self-calibrate every cycle.
2. Positive Displacement Precision: Employs high-durability synchronized oval gears to provide volumetric measurement unaffected by fluctuations in fluid viscosity or high backpressure.
3. Intrinsically Safe Compatibility: Designed as a non-explosionproof mechanical primary block that integrates seamless 7VDC, 4mA low-current switches for remote monitoring in hazardous zone gas carrier decks.
4. Rugged Heavy-Duty Enclosure: Constructed from high-tensile FC250 cast iron, providing robust resistance against mechanical shock, pipe stresses, and marine atmospheres.
5. Low Pressure Drop Footprint: Optimized inner flow geometry keeps flow restriction low across the 0.083 to 8 L/min operating spectrum.

Applications

• LNG/LPG Gas Handling Systems: Accurate tracking of critical “OBJECT GAS” process and barrier control valves.
• Marine Cargo & Tanker Systems: Centralized console tracking for oil tanker loading/off-loading multi-valve manifolds.
• Ballast and Bilge Control Lines: Real-time remote monitoring of double-acting hydraulic valves in ship hull frames.
• Offshore Industrial Gas Pipelines: Main manifold hydraulic actuator tracking in harsh open-deck platforms.

Chief Engineer’s Installation & Maintenance Protocols

1. Air Bleeding is Mandatory: Entrained air within the indicator hydraulic line is the primary reason for mechanical pointer drift or clutch slippage. Upon first installation or system open-up, configure a temporary bypass using the emergency hydraulic stand connectors. Flush and circulate the ISO VG oil continuously for at least 40 minutes while cycling the remote valve to thoroughly evacuate all air pockets.
2. Microswitch Adjustments: If you are using the optional remote feedback switches, check the upper (SHUT side) and lower (OPEN side) microswitch travel tolerances. Ensure that the actuator cam forces the roller to travel a minimum of 0.5 mm beyond the physical electrical “ON” click and 0.5 mm past the “OFF” position. Use an M3 hex wrench to lock the cam unit securely after fine-tuning.
3. Viscosity Monitoring: While the positive displacement system is highly resilient, extreme lacquer buildup or degraded hydraulic fluid will induce micro-slippage within the mechanical friction clutch assembly. Always maintain oil purity according to ISO 4406 cleanliness targets to avoid scoring the close-tolerance oval rotors.