Bild Shape 1


Safety when flows reverse

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

Temperature range
–50 °C / –58 °F up to 250 °C / 482 °F

Pressure Class
PN 2.5/6/10/16/25/40
ANSI 150/300

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
gas systems.

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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