Patent ID: 9616498
Date: 2017-04-11
CPC Classifications: B22F,F01L,F16K

Claim:
1. A method for manufacturing a valve spindle having a valve disc and a valve stem, the method comprising the steps of: providing a capsule which defines at least a portion of the valve disc; arranging, in said capsule, a preformed core body that includes a core head, which constitutes an inner portion of the valve disc; arranging a preformed annular valve seat in said capsule, wherein the valve seat is arranged such that the inner circumferential side of the valve seat at least partially defines an inner space around the core head; filling the inner space with a first metallic material, which will form a buffer layer, such that the core head is covered with said first material; filling the capsule with a second metallic material, which will form a cladding layer; and subjecting said capsule to Hot Isostatic Pressing at a predetermined temperature, a predetermined isostatic pressure and for a predetermined time so that the preformed core body, the buffer layer, the cladding layer and the valve seat are bonded metallurgically.