Our GMZ check valves protect important continuous flow machines from the dangers of backflows. An extremely low degree of internal friction and a finely responsive adjustable counterweight enable the valve to react sensitively. The GMZ is additionally equipped with a pneumatic, spring-controlled drive, enabling controlled and rapid closing behaviour. It is also fitted with a hydraulic damping system to avoid any tendencies the valve disc has to vibrate during flow changes.
Positive closing behaviour via spring-loaded pneumatic operation
Adjustable hydraulic damping facility
Avoidance of tendencies of the valve disc to vibrate during operation
Adjustability of slight pressure losses via the closure weight
Additional screw retention
High availability and long service life
DN 150 / 6 inches up to DN 2000 / 80 inches
–50 °C / –58 °F up to 250 °C / 482 °F
Construction lengths in accordance with
ISO 5752 BS 14 (F4)
Custom-made construction lengths on request
Valves designed in accordance with international
standards, e. g.
AD technical instructions, ANSI, API, ASME, ATEX, BS, DGRL, DIN EN / ISO, GOST, KTA, MSS, NACE, RCC-M
As automatically closing check valves, MAG and GMZ are used in exhaust steam pipes in steam turbines as well as in pressure lines of compressors in air and
The valves can be fitted with either a hydraulic or pneumatic auxiliary drive with spring loading as additional closing support. An overrunning
clutch (MAG) enables the free movement, which is not influenced by drive and gland shaft friction.
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