Our customer required four tight shut-off valves DN700, one tight shut-off valve DN1200 and four special control valves DN700 that would realize a high pressure drop without cavitation problems. We hit the ground running and started engineering. A solution for the tight shut-off valves was easily found. Our tight shut-off, throttle and control valve type MAK DN1200, a steam turbine isolation exhaust valve, will be mounted in the main steam and bypass system. All of the high-quality butterfly valves type MAK DN700 will operate in the district heating system. The tight shut-off valves type MAK will be used on the inlet of a condenser in the high pressure (HP) and low pressure (LP) area. Simultaneously we have started with the development of the special control valves and the special control trim. The new control valves type MAKO will come into operation at the heating condenser of the high and low pressure area. The four valves will each be mounted at the outlet and at the bypass of both the high and the low pressure area.

A requirement of the control valves has been, that they prevent cavitation, regulate the flow and minimise noises. ADAMS has accepted the challenge and designed the customized MAKO Trim within three months for this purpose. Heart of that construction is the special disc design with teeth to create flow channels. These will regulate the flow optimally, prevent cavitation and loud noises. Sounds easy but you need a lot of experience and know how supported by CFD simulations. Next to the teeth that have been cut into the discs, the back of the disc has also been adjusted. The special form creates a change of the flow chart within the first 20 degree and the last ten degree. This leads to a nearly perfect, even percentage characteristic curve during the whole flow area.