Corner joint for mounting hollow or tubular profiles in wall opening to form door or window frame
NL8301091A
Pipe coupling for automatically closing both pipe ends when removing the coupling.
NL8300980A
Apparatus for controlling the pressure difference of a pump-moved liquid, such as the heat-transmitting medium in a heating system.
NL8204123A
Pressure gradient control for central heating pumps - has sprung valve and pin and induction coil to limit unseated valve opening to respond to variable heat demand
NL8105875A
Device for protecting a heating boiler, in particular a boiler fired with solid fuel.
NL8105123A
Adjustable valve, in particular for keeping a short-line of a pump closed to a particular adjustable medium pressure.
