Cement Bag Valve Types: Outer, Ultrasonic and Ring Valves

A valve bag fills through a small opening (the valve) instead of an open top, which makes filling faster and cleaner on automatic spouts. The valve is the part your filling spout enters, and its construction decides how well the bag seals, how much dust escapes, and how it holds up during transport.

Outer valve (with finger-grip notch)

An outer valve is formed by folding the paper wall outward at the mouth. A finger-grip notch (a small cutout at the valve mouth) lets the operator pull the valve open easily before filling. It is the most common choice for cement, mortar and tile adhesive, where a simple, low-cost, dust-controlled valve is enough.

Ultrasonic valve

An ultrasonic valve is sealed by ultrasonic welding, so the valve paper is heat-bonded rather than merely folded. This gives a tighter, self-closing seal that resists reopening during handling — a good fit for fine, dusty powders and for bags that travel long distances.

Ring / inner valve

A ring valve (or inner valve) adds a paper ring inside the mouth for a firmer, more stable opening that fills consistently and resists collapse. It is often chosen for higher-speed lines and for heavier contents.

Which valve should you choose?

• Outer valve — general cement, mortar, tile adhesive; simple and economical.
• Ultrasonic valve — fine, dusty or moisture-sensitive powders; tighter sealing.
• Ring valve — high-speed filling and heavier loads needing a firmer mouth.

We make all three with a standard 10.5 cm valve and can tailor width (35–48 cm), length and film liner to your product. Send us your filling line details and we will recommend the right construction.