HD-Piston Valve
10.03.2004
The HP slide valve is designed as a round slide valve. A hardened and honed tool steel liner is inserted into the bronze housing. The steam openings in the liner around the slide valve completely relieve the pressure on the valve and therefore require very little control force.
Due to the internal inflow, the full boiler pressure only acts within the slide valve. The only thing that acts on the stuffing box is the exhaust from the HP cylinder, which then passes from there via the receiver into the LP cylinder.
On the right, the filing of the steam channels is almost complete. In the middle, the round holes are sufficient, as no control times run over their edges. On the left, everything still has to be filed square. The ends of the bushing are not yet completely turned here and there is still some excess material there that is needed for clamping. The bushing will be glued into the housing later. The glue serves as a seal, and it is held mechanically by the covers at the top and bottom.