Valve with seat assembly

A method for sealing within a valve, said valve having a valve body with a passageway therethrough, said passageway defining one or more recesses adjacent, a valve closure element being disposed within said valve chamber for controlling flow through said passageway, said method comprising:

• providing a first seat element for said one or more recesses;
• providing a seal element for sealing with said first seat element with two wing elements with sealing surfaces;
• providing a spreader element that extends between said two wing elements to further urge said two elements outwardly for sealing;
• mounting said spreader element so as to be moveable towards or away from said seal element such that said spreader element wedges said wing elements outwardly as said spreader element moves towards said seal element.

A seal assembly for use in a valve body, said valve body having a flow passage extending through said valve body, said valve body having one or more recesses surrounding flow passage, said seal assembly comprising:

• a first seat element disposed in said one or more recesses;
• a seal element for sealing with said first seat element, said seal element having a closed end and an open end so as to form two wings, each wing having a sealing surface on an outer side thereof;
• a spreader element that is extendable between said two wings, said spreader element being moveable between said two wings for engaging said two wings and urging said wings outwardly for sealing contact;
• and
• an anti-extrusion ring adjacent said closed end of said first seal element.

A seal assembly for use in a valve body, said valve body having a flow passage extending through said valve body, said valve body having one or more recesses surrounding flow passage, said seal assembly comprising:

• a first seat element disposed in said one or more recesses;
• a seal element for sealing with said first seat element, said seal element having a closed end and an open end so as to form two wings, each wing having a sealing surface on an outer side thereof;
• and
• a spreader element that is extendable between said two wings, said spreader element being moveable between said two wings for engaging said two wings and urging said wings outwardly for sealing contact, said spreader element comprising a tubular element that extends between said two wings.

A seal assembly for use in a valve body, said valve body having a flow passage extending through said valve body, said valve body having one or more recesses surrounding flow passage, said seal assembly comprising:

• a first seat element disposed in said one or more recesses;
• a ring shaped unidirectional seal mounted adjacent said first seat element for sealing contact therewith, said ring shaped unidirectional seal comprising two wings, each of said two wings comprising a seal surface on an outward side, said seal surfaces being comprised of non-elastic material;
• an expander element for insertion between said two wings so as to expand said two wings;
• a second seat element disposed in said one or more recesses adjacent said first seat element;
• and
• said seal element engaging said first seat element and said second seat element for forming a seal therebetween.