Revisamos la compresión durante el control de calidad.

Revisamos is the nosotros form of revisar. It can mean either we review/check in the present or we reviewed/checked in the preterite. This happens with many -ar verbs in the nosotros form.

So context decides:

• Ahora revisamos la compresión = Now we check the compression
• Ayer revisamos la compresión = Yesterday we checked the compression

In a technical or procedural sentence like this, it often feels like a present-tense process description: we check.

Because compresión is a feminine singular noun, so it takes la. Articles in Spanish must agree with the noun in gender and number.

So:

• la compresión
• las compresiones

No. They are different words.

• compresión = compression
• comprensión = understanding or comprehension

They look very similar, so learners often mix them up. In your sentence, compresión is the technical noun compression.

Revisar is very natural for checking, inspecting, or reviewing something, especially in work, technical, or quality-control contexts.

Roughly:

• ver = to see
• mirar = to look at
• comprobar = to verify or confirm
• revisar = to check/inspect/review

So revisamos la compresión sounds like a normal professional or technical way to say that the compression is being checked.

Durante means during. It introduces the time period when the action happens:

• durante el control de calidad = during the quality control process/check

It is a preposition, and it does not change form.

Because control is a masculine noun, so it takes el.

The whole phrase control de calidad is a standard expression meaning quality control. Literally it is control of quality, but English normally says quality control.

This is a very common pattern in Spanish:

• centro de salud = health centre
• tarjeta de crédito = credit card
• control de calidad = quality control

In set expressions like control de calidad, Spanish usually does not use an article after de. Here de calidad identifies the type of control.

So control de calidad is the normal general label for quality control.

If you said control de la calidad, that would sound more specific, as if you were talking about the quality of something in a more pointed way, not just naming the process.

The accent mark shows that the stress falls on the last syllable: com-pre-sión.

Without the accent mark, standard spelling rules would make you stress it differently. So the written accent is there to show the correct pronunciation and spelling.

Yes. Spanish word order is fairly flexible here. You can also say:

Durante el control de calidad, revisamos la compresión.

That puts the time phrase first and may sound a little more natural in some contexts. The meaning stays basically the same.

In a normal full sentence, that sounds unnatural. Spanish usually keeps the article with a noun like this, especially in standard prose:

Revisamos la compresión.

You may see article omission in notes, headings, labels, or very telegraphic technical writing, but in ordinary sentences the article is normally expected.