440 High Precision Gear Pumps
440 High Precision Gear Pumps suppliers
440 High Precision Gear Pumps factory
440 High Precision Gear Pumps best

440 High Precision Gear Pumps

This is a positive-displacement external-gear metering pump. It features a pair of high-precision, ground 440-grade steel gears that mesh and rotate, with the gear tooth spaces carrying the medium from the inlet to the outlet. The flow rate is strictly linear with respect to rotational speed; the pump utilizes a closed-loop servo control system to achieve high volumetric efficiency and low-pulsation output. A jacketed version is available, allowing for temperature control via thermal oil or hot water—a feature that reduces the viscosity of high-viscosity media and ensures consistent, stable metering.

Send Inquiry

Product Introduction

440 High-Precision Gear Metering Pump: An external-engagement positive-displacement precision metering pump. The pump body, gears, and shafts are constructed from 440C/440B martensitic stainless steel (hardened for superior hardness).

Characterized by exceptional hardness, wear resistance, high-pressure capability, and high precision, it is well-suited for applications involving trace fine particles, high-viscosity polyurethane (PU) systems, polyols, resins, bitumen, and hot-melt adhesives.

Options include thermal insulation jackets and magnetic drives; the pump is widely used for precise dosing in polyurethane processing, chemical manufacturing, coating operations, and extrusion processes.

high precision gear pumps

Materials of high precision pumps

- Gears & Drive Shafts: 440C (standard) / 440B, hardened and precision-ground; optional DLC (Diamond-Like Carbon) wear-resistant coating
- Pump Body / Pump Cover: 440C
- Bearings: Hard alloy / PEEK, SiC, or graphite bushings
- Seals: PTFE, FFKM
- Drive Types: Mechanical seal or leak-free magnetic coupling; explosion-proof servo motors or variable-frequency drive (VFD) motors available
- Structural Options: Jacketed (for thermal insulation) or vacuum-compatible designs available

Typical Applications

1. Polyurethane Industry: Precision metering and transfer of polyols, polyethers, polyester polyols, PU prepolymers, and catalysts (316L stainless steel gears are generally preferred for MDI/TDI isocyanates, while 440 stainless steel gears are recommended for polyols).
2. Adhesives / Hot-Melt Adhesives: Precision metering and coating applications for hot-melt adhesives, epoxy resins, acrylic adhesives, and sealants.
3. Fine Chemicals: Dosing and blending of resins, additives, silicone oils, lubricating oils, and plasticizers.
4. Quantitative transfer for bitumen, polymer extrusion, fiber spinning, and coatings/inks.

FAQ:

Q1: What material is the gear?

A: Gears & shaft are 440C martensitic stainless steel with heat treatment, HRC58~62. DLC coating optional for extra wear resistance.

Q2: What is the advantage of 440 gear vs 316L gear?

A: 440C has much higher hardness and wear resistance, suitable for fluid with tiny soft fillers, high pressure working condition. But its chemical resistance is lower than 316L.

Hot Tags: 440 high precision gear pumps, China, manufacturers, suppliers, price

Gear Pump Specifically For Slot-Die Coating Processes

High Precision Pump For Optical Films