The GEMÜ 514Z 2/2-way angle seat globe valve has a low-maintenance, two-stage aluminium double-piston actuator and is pneumatically operated. The valve spindle is sealed by a self-adjusting gland packing providing low-maintenance and reliable valve spindle sealing even after a long service life. A wiper ring fitted in front of the gland packing also protects the seal against contamination and damage.