Negative-pressure Discharge Gear Pump

Featuring a large-diameter suction inlet and a specialized vacuum-rated sealing structure, the pump suppresses air backflow-thereby maintaining system vacuum integrity-and resolves common issues such as difficult suction, flow interruption, and air ingress during high-vacuum operation. The pump body offers an optional heating jacket to prevent high-temperature materials from cooling and solidifying; servo-driven operation ensures a linear relationship between flow rate and rotational speed, resulting in minimal output pulsation.
It is widely used in conjunction with polymerization reactors, vacuum distillation units, short-path molecular distillation systems, and thin-film evaporators. Applications include the discharge of heavy fractions and the continuous extraction of high-viscosity materials from vacuum systems, combining material transfer with precise metering to enable continuous vacuum processing.

Key Features
• Excellent suction capacity under high negative pressure. Large inlet flange and vacuum sealing prevent gas backflow.
• Positive displacement precise metering. Flow linearly proportional to rotating speed, stable discharge, low pulsation.
• Optional heating jacket, heat medium circulation to keep temperature and prevent blockage.
• Wetted parts: 316L stainless steel, Hastelloy HC276 for corrosive organic media.
• Low shear design, reduce thermal degradation for heat-sensitive materials.
• Servo motor drive, PLC compatible, closed-loop control for automatic process integration.

Applications
Vacuum discharge of polymerization reactor, heavy fraction collection for short-path molecular distillation, vacuum distillation, wiped film evaporator. Suitable for polyether, PU prepolymer, epoxy resin, oligomer, plant extracts, fish oil and other high viscosity heat-sensitive materials.

FAQ

Q: Can this pump work when inlet is under high vacuum?

A: Yes. Adopted special vacuum sealing and enlarged suction port, it can pull high viscosity material out directly from vacuum chamber and avoid air backflow.

Q: What is the difference between this pump and normal melt pump?

A: Optimized suction structure and vacuum sealing. Ordinary melt pumps are for pressurizing; this one is specially designed for feeding from negative pressure vacuum vessel.

Q: Magnetic coupling seal available?

A: Yes. Magnetic drive version is optional to achieve zero leakage for high vacuum system.

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