ApplicationNo. 514892 filed on 02/28/2000
US Classes:251/315.02, Having a particular hardness (i.e., durometric property)166/330, Rotated operator251/314, Seat or interface seal251/317Deformable material
ExaminersPrimary: Shaver, Kevin
Assistant: Bonderer, D. Austin
Attorney, Agent or Firm
International ClassesF16K 005/06
AbstractA valve includes a valve ball and a convex metal valve seat ring that abut along a circle in a metal-to-metal seal. At very high contact forces, the valve ball and/or the valve seat elastically deform to increase the contact area between them and thereby lower the contact pressures applied to the valve ball and valve seat. The valve ball and valve seat are made of materials that do not pressure weld under a wide range of contact pressures. In one embodiment, the valve ball is a stainless steel alloy having a hardness of at least Rockwell 44C and the valve seat is Stellite having a hardness of at least Rockwell 50C. In another embodiment, the valve ball and seat ring are steel alloys having hardnesses above Rockwell 50C.