F&J - Model LV34ME - Low Volume Air Sampler (200 - 240 VAC) - Brochure
The Model LV34ME consists of a 3/4 HP oil-less vacuum pump with an airflow regulator for use where a nearly constant airflow is desirable. The regulator holds a constant pressure drop across an in-line orifice by varying a bypass valve into the pump. This system allows the pump to work at a minimum head drop at all times permitting it to run ...