Patent ID: 9528623
Filing Date: 2016-12-27
CPC Classification: F16B,F16K

Claim Text:
1. A positioning device for a process plant, comprising: a valve comprising a valve housing, a valve seat, and a valve member actuated by use of a lead-through opening in the valve housing; a top configured to screw onto the lead-through opening and to rigidly couple the valve housing to an actuator; a deformation buffer in the form of a disc arranged between mutually opposite respective screw stop surfaces of the top and of the valve housing and which is deformed in a predetermined manner when screwing the top onto said lead-through opening; the disc having at least one engaging nose protruding from one side of the disc, said at least one engaging nose being at a radial distance from a center of the disc; said at least one engaging nose engaging in an engagement depression in the screw stop surface of the top or in the screw stop surface of the valve housing, wherein the engagement depression is shaped complementary to the engagement nose and configured to rotationally lock the disc at a circumferential position; the disc also having at least one deformation zone facing the top or facing the valve housing and which is deformed gradually when screwing; and said at least one deformation zone being at least one bulge in the disc, said bulge being at a same radial distance from the center as said radial distance of the at least one engaging nose from the center, the at least one engaging nose being differently shaped from the at least one bulge, wherein the at least one bulge is plastically deformable and configured to plastically deform when the deformation buffer is compressed during assembly of the positioning device.