External Gear Pump (Standard Tooth Wheel Pump)

Category Overview
Tooth wheel pumps — commonly called gear pumps — are positive displacement rotary pumps in which meshing gear teeth trap fluid between tooth spaces and the casing wall, transporting it from inlet to outlet at a fixed volume per revolution regardless of discharge pressure. Flow rate is linearly proportional to rotational speed — making gear pumps inherently precise metering devices without additional flow control elements. All gear pump types are reversible, self-priming, and capable of generating high differential pressure on viscous fluids that centrifugal pumps cannot handle. Four configurations address the full application spectrum: external gear (highest pressure, universal industrial duty); internal gear / crescent pump (lowest shear, particle-tolerant, shear-sensitive product transfer); helical gear (lowest pulsation and noise, precision metering); and sanitary gear (3-A/EHEDG hygienic design for dairy, food, pharmaceutical, and biotechnology service).

What It Is

How It Works

What It Is

How It Works

Challenges

Solutions

Hardened Steel or Ceramic-Coated Gear Teeth (HRC 58–62): Surface hardening or ceramic coating extends service life 5–10× against abrasive fluid — maintains tooth profile accuracy.
Balanced Double Mechanical Seal with Barrier Fluid: Balanced seal reduces hydraulic closing force — extends seal life 3× at high differential pressure.
Speed Reduction with Larger Displacement Gear (Maintain Flow, Reduce Slip): Oversized gear at reduced RPM achieves target flow at lower operating speed — slip as fraction of total flow is minimised.
Jacketed Pump Casing with Cooling Water: Cooling jacket on pump casing removes frictional heat — maintains fluid temperature within process limits.
Helical Gear Profile Option (Replaces Spur Teeth): Helical gears provide gradual tooth engagement — reduces noise by 10–15 dB(A) and pressure pulsation by 60%.

Applications

Chemical: Polymer melt transfer, resin dosing, adhesive pumping, solvent metering — viscous fluid positive displacement.
Food & Beverage: Chocolate, honey, glucose syrup, molasses, edible oil pumping and metering.
Pharmaceutical: Ointment and cream transfer, viscous API solution metering, API suspension dosing.
Petrochemical: Fuel oil, lubricant, bitumen, heavy crude transfer and metering at elevated temperature.
Cosmetics: Lotion, cream, shampoo, conditioner, and gel dosing and transfer in filling lines.

Models & Capacities

Type 1A — External Gear Pump (Standard): Models & Capacities
Model	Scale	Flow Rate [L/min]	Flow Rate [m³/h]	Gear Size [mm]	Speed [RPM]	Max Pressure [bar]	Max Viscosity [cP]	Max Temp [°C]	Motor [kW]	Inlet/Outlet Ø [mm]	L×W×H [mm]	Weight [kg]
EGP-006	Lab/Micro	0.1–1	0.006–0.06	Ø6	20–200 VFD	20	1,000,000	150	0.09	DN 6	180×80×90	2
EGP-016	Lab	0.5–5	0.03–0.3	Ø16	20–1,450 VFD	30	1,000,000	200	0.12	DN 10	220×100×110	4
EGP-025	Lab/Pilot	1–15	0.06–0.9	Ø25	20–1,450 VFD	40	1,000,000	200	0.18	DN 15	260×120×130	7
EGP-040	Pilot	5–40	0.3–2.4	Ø40	20–1,450 VFD	60	1,000,000	200	0.37	DN 20	310×145×160	12
EGP-063	Pilot	10–100	0.6–6	Ø63	20–1,450 VFD	80	1,000,000	200	0.75	DN 25	380×175×195	22
EGP-100	Production	30–250	1.8–15	Ø100	20–1,450 VFD	100	1,000,000	200	1.5	DN 32	460×215×240	42
EGP-125	Production	50–400	3–24	Ø125	20–1,450 VFD	120	1,000,000	200	2.2	DN 40	540×255×285	65
EGP-160	Production	80–600	4.8–36	Ø160	20–1,450 VFD	150	1,000,000	200	3.0	DN 50	640×305×340	100
EGP-200	Production	150–1,000	9–60	Ø200	20–1,000 VFD	160	1,000,000	200	5.5	DN 65	760×365×405	160
EGP-250	Production	250–2,000	15–120	Ø250	20–750 VFD	180	1,000,000	200	7.5	DN 80	900×430×480	250
EGP-315	Large Prod	500–4,000	30–240	Ø315	20–600 VFD	200	1,000,000	200	11	DN 100	1,080×510×575	400
EGP-400	Large Prod	800–6,000	48–360	Ø400	20–500 VFD	200	1,000,000	200	15	DN 125	1,300×610×690	620
EGP-500	Large Prod	1,200–8,000	72–480	Ø500	15–400 VFD	200	1,000,000	200	22	DN 150	1,550×720×820	950