Ventilen lekker.

Ventilen means the valve.

The basic noun is en ventil = a valve. In Norwegian, the definite article is usually added to the end of the noun:

• en ventil = a valve
• ventilen = the valve

Useful full pattern:

• en ventil = a valve
• ventilen = the valve
• ventiler = valves
• ventilene = the valves

Here, lekker is the present tense of å lekke, which means to leak.

So:

• å lekke = to leak
• lekker = leaks / is leaking
• lekket = leaked

In Ventilen lekker, it means the valve leaks or the valve is leaking.

Because Norwegian often uses the simple present where English uses either the simple present or the present progressive.

So lekker can mean both:

• leaks
• is leaking

That is completely normal in Norwegian. You do not need a separate verb like is here.

Yes. Lekker can also be an adjective meaning attractive, stylish, or delicious, depending on context.

But in this sentence it is clearly a verb:

• Ventilen lekker. = The valve is leaking.
• En lekker middag. = A delicious meal.

So context tells you whether lekker is a verb or an adjective.

Because er + lekker would normally make lekker sound like an adjective, not a verb.

So:

• Ventilen lekker. = The valve is leaking.
• Ventilen er lekker. = The valve is attractive/delicious/stylish.

That second sentence would sound strange for a valve unless you were joking.

A rough guide is:

• Ventilen ≈ ven-TEE-len
• lekker ≈ LEK-er

A few points:

• ventil has the stress on the second syllable.
• lekker has the stress on the first syllable.
• The double kk shows that the vowel before it is short.

Exact pronunciation varies by dialect, but this approximation is a good start.

Add ikke after the verb:

• Ventilen lekker ikke. = The valve is not leaking.

That is the normal word order in a simple statement: subject + verb + ikke

In a yes/no question, Norwegian usually puts the verb before the subject:

• Lekker ventilen? = Is the valve leaking?

Compare:

• Ventilen lekker. = The valve is leaking.
• Lekker ventilen? = Is the valve leaking?

Yes.

• En ventil lekker. = A valve leaks / A valve is leaking.
• Ventilen lekker. = The valve leaks / The valve is leaking.

So the difference is just whether you mean a valve in general or the valve, a specific one.