What Is the Maximum Flow Rate of a 20L/5gal Pneumatic Grease Pump for Industrial Use
2026-06-10
When selecting a 20L/5gal Pneumatic Grease Pump for industrial lubrication tasks, the maximum flow rate is a critical performance metric. For WYMA industrial-grade units, the flow rate typically ranges from 0.5 to 1.2 L/min at 100 psi, depending on grease viscosity and hose length. Higher-flow models can reach 1.8 L/min with low-viscosity fluids, but heavy greases (NLGI #2) reduce output. Understanding this ensures efficient operation in mining, construction, or automotive assembly lines.
Why Flow Rate Matters in Industrial Settings
Flow rate directly impacts downtime and labor costs. A pump delivering 1.2 L/min can service 15–20 bearings per minute, while slower units cause bottlenecks. Below are typical ranges for 20L/5gal Pneumatic Grease Pump systems:
| Grease Grade (NLGI) | Pressure (psi) | Max Flow Rate (L/min) | Application |
|---|---|---|---|
| #0 (fluid) | 120 | 1.8 | Central systems |
| #1 (semi-fluid) | 100 | 1.2 | General assembly |
| #2 (standard) | 85 | 0.7 | Heavy machinery |
| #3 (stiff) | 75 | 0.4 | High-temp zones |
*Data based on WYMA laboratory tests with 4-meter hose, 10°C ambient temperature.*
3 FAQ About 20L/5gal Pneumatic Grease Pump Flow Rate
Q1: Can I increase the maximum flow rate of my 20L/5gal Pneumatic Grease Pump by raising air pressure?
A: No. Exceeding the recommended max air pressure (usually 120 psi for WYMA pumps) will not increase flow rate linearly. It may damage internal seals or cause bypass valve failure. Instead, use a larger air line (3/8″ ID) and shorten grease hose length to reduce friction loss.
Q2: Why does my 20L/5gal Pneumatic Grease Pump deliver less than half the rated flow rate in winter?
A: Cold temperatures thicken grease. For every 10°C drop below 15°C, flow rate decreases by 30–40%. WYMA recommends using NLGI #1 grease in winter or installing a heated drum cover. Preheating the pump head with a heat gun for 2 minutes can restore 80% of rated flow.
Q3: Does a longer grease hose reduce the maximum flow rate of my 20L/5gal Pneumatic Grease Pump?
A: Yes. Each additional meter of 1/4″ hose reduces flow by roughly 8–10%. For a 10-meter hose, maximum flow drops from 1.2 L/min to 0.5 L/min. WYMA suggests using 1/2″ ID hose for runs over 5 meters and keeping total hose length under 15 meters for optimal performance.
Technical Tips to Optimize Flow Rate
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Check air inlet filter weekly – clogged filters reduce pump cycle speed by 50%.
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Match grease grade to pump specifications. WYMA pumps work best with NLGI #0–#2.
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Install a regulator at pump inlet to maintain stable 85–100 psi.
For maximum efficiency, pair your 20L/5gal Pneumatic Grease Pump with WYMA automatic hose reels and moisture separators.
Need a custom flow rate solution? Contact WYMA today for application engineering support and bulk pricing. Our team provides OEM flow testing and 24‑hour troubleshooting.
