Needle valves are used when a liquid or gaseous medium must be precisely controlled or the flow rate must be precisely metered. They are also used for the shut-off and venting of pressure measuring instruments. In particular, the model HPNV high-pressure needle valve is used for installations with constricted space for control panels or for test benches. Seizing and scraping within the valve is prevented by the non-rotating valve spindle, which increases the service life of the unit in the case of frequent opening and closing.