High Vacuum Pump

The ACME high vacuum pumpis Yash Blowers’ workhorse oil-sealed rotary vane pump for deep-vacuum industrial duty. Where a side-channel or ring blower tops out around 300–500 mbar of vacuum, the ACME series reaches 750 mm/Hg — about 10 mbar absolute — from a single rotor. That is the difference between merely moving air and actually pulling a process vacuum deep enough to hold a load, draw a resin into a casting, or evacuate a chamber for forming.

Eight models cover the range from the compact ACME-010 (10 m³/hr, 0.5 HP, 20 kg) up to the ACME-302 (302 m³/hr, 10 HP). All eight hold the same 750 mm/Hg ultimate vacuum, so you size on displacement and pump-down time rather than on the vacuum level — the depth is a constant across the series. Every unit is machined, assembled, balanced and vacuum-tested in our Faridabad plant before it ships.

Where it earns its place

The ACME is specified wherever a reliable medium-to-high vacuum has to be held for hours at a time: vacuum holding and clamping fixtures, resin and varnish impregnation of motor windings and transformers, vacuum forming and thermoforming, gas evacuation and back-filling, central vacuum for pick-and-place, drying and moisture removal, and laboratory or pilot-plant rigs that do not need sub-millibar depth. It is a proven, repairable, field-serviceable design — not a sealed black box.

Sizing a vacuum pump is about time, not just depth. Every ACME model reaches the same 750 mm/Hg, so the question is how fast you need to get there and how much leakage and outgassing the pump must overcome to stay there.

• Estimate the volume to evacuate — chamber, hose, manifold and any downstream vessels, in litres or m³.
• Decide an acceptable pump-down time. A rough guide: pick a displacement (m³/hr) that evacuates your total volume several times over within that time, because pumping slows as pressure drops.
• Add margin for leakage and outgassing. Real systems leak at fittings and seals; wet or porous loads outgas. A pump sized with no margin will run continuously and never settle.
• Match the model. ACME-010/020 suit benches and small fixtures; ACME-040/063/100 cover mid-size forming and impregnation; ACME-140/202/302 handle large chambers and central-vacuum headers.

Note the 2800 rpm ACME-020 if space and weight matter — it delivers 20 m³/hr from the same 20 kg frame as the ACME-010 by spinning faster. For continuous heavy duty, the slower-turning 1400 rpm models generally run cooler and wear more slowly. Send us your chamber volume and target time and we will confirm the model — no guesswork.

Installation

• Mount on a flat, rigid base; leave clearance around the fan cowl for cooling air. Keep ambient below 40 °C.
• Fit a suction filter (YEBL-FA) at the inlet — dust is the fastest way to score a bore and ruin oil.
• Fit an anti-suckback / non-return valve so oil cannot be drawn back into the chamber when the pump stops under vacuum.
• Use full-bore hose and short, straight inlet runs; every elbow and restriction costs you pump-down speed.
• Fill with the specified vacuum oil to the sight-glass line before first start. Check rotation direction.

Maintenance schedule

• Weekly: check oil level and colour through the sight glass; clear the inlet filter.
• Every 500–2,000 hours: change the vacuum oil — sooner for wet or dirty gas, later for clean dry air.
• At each oil change: inspect vanes for wear and chipping; replace as a set when they reach their limit.
• Annually: check the shaft seal, motor bearings and coupling; verify ultimate vacuum against 750 mm/Hg with a gauge.

Follow this and an ACME pump runs for years. Ignore the oil and no vacuum pump — from any maker — will hold its rating.

If the Vacuum Falls Short

Most vacuum complaints trace back to oil, a leak or a filter — not to the pump itself. Work through these before condemning the machine.

• Will not reach 750 mm/Hg — check for an inlet leak first (a single loose fitting caps the vacuum), then low or dirty oil, a clogged suction filter, or vanes at their wear limit. Fix in that order.
• Oil turned milky or emulsified — vapour is condensing into the oil. Open the gas ballast and run the pump warm to purge it; fit an inlet trap on wet duty; change the oil if it stays contaminated.
• Pump running hot — clear the cooling fins and fan cowl, confirm ambient is below 40 °C, and verify the pump is not being asked to hold more airflow than its rating.
• Oil found in the vacuum line or chamber — oil is being drawn back on shutdown. Fit an anti-suckback / non-return valve at the inlet.
• Noisy or vibrating — inspect for worn or chipped vanes and check the motor bearings and coupling.

• Vacuum holding & clamping — CNC fixtures, printing and lamination beds, pick-and-place.
• Impregnation — resin and varnish impregnation of motor windings, transformers and coils.
• Vacuum forming & thermoforming — packaging, trays, automotive and appliance parts.
• Degassing & gas evacuation — removing entrained air from liquids, potting compounds and adhesives.
• Drying & moisture removal under vacuum, with gas ballast for the vapour load.
• Central vacuum systems feeding multiple stations from one header.
• Laboratory & pilot plant rigs needing a dependable medium-to-high vacuum.