Form fields validation only if visible

Hi, I can validate form by the help of FormBuilder and FormControl as below

>  this.myForm = this.formBuilder.group({
>       Description: new FormControl('', Validators.required),
>       PerHour: new FormControl('',Validators.required))
>  })

But I want to validate field PerHour only if this is visible.
PerHour is visible when I click on radio button.

Means; validate only if flag is true.

How can I do this?

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