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I put all model related validation into my models.

Most of the time I use Orm models with the Observer_Validation, check out the examples in the docs.
If you want to use the validation without the observer I'd just run validation based on the Model and when validation succeeded use $val->validated() in the same way as I just demonstrated Input::post(). When the $_properties setting is fully configured you can add all the fields with their configured rules using $val->add_model('Model_Example'). If you're not using the Orm you can still use add_model() but you need to give your model a "set_form_fields()" method that takes the Fieldset instance as an arguement and sets all the model's fields upon it:

public function set_form_fields($fieldset, $instance = null)
{
    $fieldset->add('name', 'Name')->set_type('text')->add_rule('required');
    // etc... for all the other fields
    // optionally pass an array or model instance as the second param to use for initial values:
    $fieldset->add('email', 'Email')->set_type('text')->set_value($instance->email);
}

Check the code to see how add_model() works.