Valve insertion 阀口

A valve sleeve is fitted so the bag can be machine-filled and self-closes.

Back end 后道 Required by 16 of the 247 products we catalogue.

What actually happens

Valve bags are filled by nozzle at speed and close by the pressure of their own contents. The valve dimension must match the customer’s filling nozzle, which is a spec that has to come from the filling line, not from us.

What to specify

Give us the nozzle diameter from your filling equipment.

How it goes wrong, and what catches it

The failure mode. A valve that does not match the nozzle stops a filling line — the most expensive kind of specification error.

The control. Valve dimension confirmed against the stated nozzle before tooling.

We publish which of our plants runs this process — see the capability matrix. We do not publish which plant runs a given order.