GEMÜ 688
Pneumatically operated diaphragm valve
The GEMÜ 658 2/2-way diaphragm valve has a two-stage actuator. In addition to full stroke, a partial stroke can be set via two pistons working independently of each other. (see "Pneumatic connections", page 30)
All actuator parts including closing springs (except seals) are made from stainless steel. The valve is available with a Normally Closed control function.
An opening stroke limiter for setting the partial stroke is integrated as standard.