Reply To: Huben Hammerless K1
Sorry River Devil I can’t comment on the Stehr LP50 as I don’t know this gun. I think that it is hammer operated in which case it is quite different from the Huben. The Huben valve is quite simple it only opens and closes. It is only connected to the sear that releases it to open and the return spring that closes it when the pressure in the barrel drops below the setting of the constant pressure valve.
Since the valve is self resetting the only thing that is necessary for semi auto action is for the magazine to be indexed. I assume that this is achieved by bleeding air under pressure from the barrel, which would not waste much energy. Recocking of a hammer valve can be achieved In the same way but would waste much more energy.