NYP Internal Ring High-Viscosity Pump

The NYP internal ring high-viscosity pump is designed for the transfer requirements of petroleum, chemical, coating, grease, pharmaceutical, dye, food, and related industries. Because different material and structural configurations can be selected, it is widely used for media with different properties and viscosity ranges.

The applicable medium temperature is from -10°C to 200°C. For NYP0.78 and NYP2.3 models, the applicable temperature range is from -10°C to 80°C. The applicable viscosity range is from 1.0 cSt to 300,000 cSt. For NYP0.78 and NYP2.3 models, the applicable viscosity range is from 1.0 cSt to 10,000 cSt.

Structure & Working Features

The NYP internal ring high-viscosity pump mainly consists of inner and outer rotors, shaft, pump body, front cover, bracket, seal, bearings, and related components.

The shaft seal is available in two forms: mechanical seal and packing seal. For high-temperature, high-viscosity, or strongly corrosive media, packing seal can be selected according to the operating conditions. When transferring materials that are easy to crystallize, the front cover and pump body can be designed with an insulation jacket, and steam can be used during operation for heat preservation and melting.

Viewed from the extended end of the main shaft toward the pump, the standard rotation direction is clockwise.

Installation & Operation Notes

The inner diameter of the suction pipeline should be large enough. Narrow passages, sharp bends, unnecessary elbows, valves, and fittings should be avoided as much as possible. The pump installation height should be reduced where practical, and the suction pipeline should be kept short to reduce pressure loss.

Pipe joints and other connected components should be well sealed to prevent air from entering the system and to help control cavitation. Before startup, the pump casing should be filled with the liquid to be transferred to support easier starting.

If the ambient temperature is below freezing, hot steam should be introduced into the pump for preheating before startup. The pump rotation direction must match the inlet and outlet arrangement.

For first-time operation or restart after long-term storage, the pump should run under no-load or light-load conditions for about one hour. If abnormal temperature rise, leakage, vibration, or noise is found during the running-in stage, the pump should be stopped for inspection.

A check valve is recommended on the outlet pipeline. This helps prevent liquid in the system from flowing back during pump or pipeline maintenance, and it can also help prevent reverse rotation when the pump stops under load.

A return valve or similar protective device should also be installed on the outlet pipeline. If the pump outlet passage becomes blocked, the return valve can be opened for pressure relief. The return valve may be integrated with the pump body or pump cover, or it may be installed separately. For high-viscosity pumps requiring forward and reverse operation, return valves should be installed on both the inlet and outlet pipelines.

Features & Advantages

• Smooth Liquid Transfer: Delivers liquid steadily with low pulsation, low vibration, and low noise.
• Strong Self-Priming Performance: Suitable for high-viscosity transfer systems requiring reliable suction.
• Material Selection Flexibility: With proper component material selection, the pump can transfer various corrosive media.
• Same-Direction Rotor Rotation: Inner and outer rotors rotate in the same direction, helping reduce wear.
• Flow Control by Speed: Pump speed and flow rate have an approximately linear relationship, allowing flow adjustment by changing speed.
• High-Viscosity Capability: Especially suitable for high-viscosity and high-consistency media.
• Optional Jacketed Structure: Insulation jacket can be used for media that crystallize or solidify at normal temperature.

Typical Applications

• Petroleum and chemical media transfer
• Coating, paint, and dye transfer
• Grease and oil transfer
• Pharmaceutical process media transfer
• Food process media transfer when the selected material configuration is suitable
• Resin and polymer media transfer
• High-temperature and high-viscosity media transfer
• Crystallizing or solidifying media requiring steam insulation

Technical Specifications