초록 ▼

A sealing sleeve for a gate valve is disclosed which is designed to respond to movements of the gate of the valve in a particular manner. The seal undergoes an axial compressive type movement as the gate is moved between opposed sealing sleeves and this causes a predetermined radially inward bucklin

A sealing sleeve for a gate valve is disclosed which is designed to respond to movements of the gate of the valve in a particular manner. The seal undergoes an axial compressive type movement as the gate is moved between opposed sealing sleeves and this causes a predetermined radially inward buckling of an intermediate wall section of the sealing sleeve. This predetermined buckling creates a spring bias in the sleeve, urging the sleeve to return to the original, less stressed condition. Preferably, the sleeve is of a composite structure and a particular component of the intermediate wall section creates this spring bias. This structure has improved operating characteristics and accommodates a wider range of resilient materials to be used for the sealing sleeve.

대표청구항 ▼

A sealing arrangement for a gate valve comprising at least one cylindrical-like seal, each cylindrical like seal having a body made of a resilient material and a cooperating buckling means, said at least one seal having a sealing end engaging a gate of the gate valve, an anchoring end securing said

A sealing arrangement for a gate valve comprising at least one cylindrical-like seal, each cylindrical like seal having a body made of a resilient material and a cooperating buckling means, said at least one seal having a sealing end engaging a gate of the gate valve, an anchoring end securing said at least one seal in the gate valve, and an intermediate section joining said sealing end and said anchoring end and accommodating controlled buckling of said buckling means and said intermediate section as said sealing end is forced toward said anchoring end during movement of said gate in a closing direction; said intermediate section having a recess formed therein with said buckling means disposed within said recess, said controlled buckling being predetermined by the configuration of said buckling means to buckle in a radial direction of said seal distorting said recess as said sealing end moves towards said anchoring end, said buckling means transferring forces between said sealing end and said anchoring end and creating a bias during controlled buckling of said intermediate section urging said intermediate section to return to the wall configuration prior to controlled buckling of said intermediate section when said gate is moved in an opening direction.