Vacuum · Solves gas porosity
Gas porosity is trapped air: the shot rams metal into a cavity that never had a chance to empty. Our vacuum systems evacuate the shot sleeve and mold ahead of the metal — so there's nothing left to trap.
Efficiency and flexibility make PRECISION VAC ULTRA a uniquely acceptable vacuum system.
Two-stage evacuation — first the shot sleeve, then the mold — empties the cavity before the metal arrives, so there is simply nothing left for the shot to trap. That is what minimises gas porosity, and it is why leak-tested and safety-critical castings specify vacuum rather than venting alone.
Serves the purpose, and saves you tons of money in rejection.
PRECISION VAC EXPAND is an extension unit mounted close to the mold. The shorter the path, the shorter the actuation time — and the better the vacuum efficiency at the point where it actually matters.
It is the vacuum solution for high-tonnage casting, where cavity volume and fill speed leave no margin for a slow-responding system.
Up to four extension units can be connected to one PRECISION VAC EXPAND.
How it works
Stage one evacuates the shot sleeve as the plunger closes the pour hole. Stage two pulls the mold cavity down through the vacuum line — timed so the melt fills a near-empty die.
Key specifications
Source: Precision System Equipments Catalogue, Edition 2025, p.9. Scroll the table sideways on a narrow screen — the specification column stays put.
| Technical specification | PRECISION VAC ULTRA | PRECISION VAC EXPAND |
|---|---|---|
| Vacuum tank sizeLtr | 2505008001000 | 5008001000 |
| Pump capacitym3/h | 4063100 | 4063100 |
The product sheets on p.7 and p.8 of the same catalogue each list one further tank size (300 L) that the comparison table above does not carry. We publish both rather than pick one — confirm the size for your machine with our engineers.
| Configuration | VAC ULTRA | VAC EXPAND |
|---|---|---|
| Evacuation | Two-stage: shot sleeve + mold | Extension unit, mounted near mold |
| Extensions | — | Up to 4 units per system |
| Best for | Standard to large HPDC machines | High-tonnage & mega castings |
The circuit, drawn
Where vacuum matters most
Venting alone can't empty a cavity in the milliseconds a shot allows. Vacuum actively evacuates it — which is why leak-tested and safety-critical castings specify it.
Related
Let’s cut your scrap rate
Send whatever you have — a drawing, a photo, a rejection report. An engineer, not a sales script, will come back to you with what we'd actually do.
