The valves RAF are valves operated hydraulically with the actuator and diaphragm closure, design on-line, and step direct. The special design of its diaphragm
ensures its elasticity and airtight closure without the aid of a spring.
A single diaphragm for the entire range of pressures and regulatory functions.
The lack of spring, the opening of the diaphragm is not affected by variations of flow or pressure in line, so that its hydraulic characteristics
The particular design of the lid prevents the formation of pockets of air trapped in the chamber.
The diaphragm is not deformed nor elongates in regulation of pressure or in the action of opening or closing.