Example : Nissan Altima- engine label indicates 1.6 valve......but LTO
documents reflects 2.0 valve...

Nissan March - engine label indicates 1.6 valve.....but LTO
documents says 1.3valve but I read in catalogue that it is
only 1.1valve.......
Mali yata. You're quoting engine capacity or displacement in LITERS, not VALVES. Just look for a section called "engine capacity" or "engine displacement" in the spec sheet. It can also be quoted in cubic centimeters (cc or cm3). 1000 cc is 1 liter (conversely, 1 cc is 1 mL).

There are different-sized engines for cars depending on where you go. I'm pretty sure you won't see any 1.3L engines for Corollas in the US, usually they carry just 1.6L units.

Valves on the other hand are usually counted in multiples of 4. If you have a four-cylinder engine and have four valves per cylinder, you have a 16-valve engine (e.g. Jazz 1.5 VTEC). If you had two valves per cylinder instead, you'd have an 8-valver (e.g. Jazz 1.3 i-DSI).