DE1015291B - Welded-in valve seat ring with hard metal armoring - Google Patents

Description

GERMAN

The invention relates to a valve seat ring with hard metal armoring, such as that used primarily for steam fittings for high pressures and temperatures. It is known such valve seat rings to be provided with a thin-walled ring attachment, the free edge of which electrically connects to the valve housing is welded. Relatively little heat is generated during electrical welding, which is quickly discharged into the housing. The hard metal armor should thereby be used when welding the Ring in the housing are not excessively heated.

The invention aims to transfer the heat from the weld to the armor to decrease further. This is achieved in that the ring attachment is thin and corrugated like a membrane. In a known embodiment, the ring attachment takes over longitudinal forces from the closing pressure, which is why it it is not possible to go down with the wall thickness to the desirably low level. at In the embodiment according to the invention, the closing pressure from the valve seat insert is applied directly to the housing transferred, it rests on the housing itself. In addition, there is also the thin, membrane-like ring attachment itself on a flat surface of the housing and is applied to this surface by the steam pressure pressed so that it is only used by local forces.

It is essential that the approach is corrugated in the embodiment according to the invention. This achieves that even more of the heat is dissipated to the welding point and accordingly less Heat penetrates to the armor, and the waves also keep the actual valve seat ring with it the armor is even better relieved of tension, as caused by the deformation of the housing at the high Temperatures can occur.

In the drawing, for example, a valve according to the invention is shown. The seat ring α made of heat-resistant, scale-free steel with the attached, membrane-like thin annular disc is welded into the housing b . The hard metal armor c is welded onto the seat ring α. The superheated steam enters in the direction of part e in order to leave the housing b after opening the valve in the direction of part d .

After armoring, the ring is slowly cooled in the furnace, then pre-turned and cold in the cold Ge-welded valve seat ring
with hard metal armor

Applicant:

Albert praise

Machine and apparatus construction G. mb H. _r Düsseldorf, Suitbertusstr. 149-151

Otto Mildenberger, Düsseldorf-Meererbusch,
has been named as the inventor

housing packed and clamped. A hard weld is then first carried out over the diagonal and, after the clamping device has been removed, further welded in ^{segments from the individual points of the 1 'hard weld.} This »· type of weld also helps to keep the heat transfer to the armor low. When operated in the installed state, it can expand in relation to the housing; To this end, an air gap is seen between the collar s and the housing.

Claims (2)

Patent claims: 1. Valve seat ring with hard metal armor and a thin-walled ring attachment, which is attached to his one edge is welded to the housing, characterized in that the ring attachment is like a membrane is thin and wavy. 2. Valve seat ring according to claim 1, characterized in that the membrane-like thin ring approach extends radially outward. Considered publications:
German Patent No. 500 026;
Swiss Patent No. 241 731;
French patent specification No. 775 203.