Two piece composite valve seal ring construction
First Claim
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1. A valve comprising:
- (a) a body with inlet and outlet flow passageways therethrough, a valve chamber therein in fluid communication with the inlet and outlet passageways, a valve member in the valve chamber movable between open and closed positions, an annular groove about one of the passageways facing the valve chamber and defined by inner and outer walls;
(b) inner and outer concentric seal rings positioned in side by side relation in said groove with said outer seal ring against said outer wall and said inner seal ring against said inner wall;
(c) said seal rings having respective flat interfitting surfaces thereon engaged with one another in an interlocking manner to hold the seal rings together against one another in the groove and to prevent relative longitudinal movement between the seal rings, and means including an enlarged projecting portion of one seal ring projecting into an enlarged portion of the groove to secure the seal rings within the groove;
(d) one of said seal rings being of a relatively soft elastomeric composition having good low pressure sealing characteristics and the other of said seal rings being of a relatively hard plastic composition having good high pressure sealing characteristics.
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Abstract
A valve seal includes inner and outer concentric seal rings located side by side in a groove with the inner seal ring against the groove inner wall and the outer seal ring against the groove outer wall. Interfitting surfaces are provided on the seal rings to hold them together and prevent longitudinal movement between them. The groove and the seal rings cooperate to hold the seal rings in the groove. One of the seal rings is relatively soft and has good low pressure sealing characteristics while the other seal ring is relatively hard and has good high pressure sealing characteristics.
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Citations
8 Claims
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1. A valve comprising:
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(a) a body with inlet and outlet flow passageways therethrough, a valve chamber therein in fluid communication with the inlet and outlet passageways, a valve member in the valve chamber movable between open and closed positions, an annular groove about one of the passageways facing the valve chamber and defined by inner and outer walls; (b) inner and outer concentric seal rings positioned in side by side relation in said groove with said outer seal ring against said outer wall and said inner seal ring against said inner wall; (c) said seal rings having respective flat interfitting surfaces thereon engaged with one another in an interlocking manner to hold the seal rings together against one another in the groove and to prevent relative longitudinal movement between the seal rings, and means including an enlarged projecting portion of one seal ring projecting into an enlarged portion of the groove to secure the seal rings within the groove; (d) one of said seal rings being of a relatively soft elastomeric composition having good low pressure sealing characteristics and the other of said seal rings being of a relatively hard plastic composition having good high pressure sealing characteristics. - View Dependent Claims (2, 3, 4, 5)
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6. In a valve having a valve body with inlet and outlet flow passageways therethrough, a valve chamber therein in fluid communication with the inlet and outlet passageways and a valve member in the valve chamber movable between open and closed positions, the improvement comprising:
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(a) an annular groove around one flow passageway defined by an outer wall, a stepped bottom surface, and an inner wall; (b) first and second concentric seal rings positioned in side by side relation in said groove with one seal ring against said groove outer wall and the other seal ring against said inner wall, each seal ring having a bottom portion in contact with said bottom surface of the groove and each seal ring having a sealing surface projecting out of the groove for sealing against the valve member; (c) said first seal ring having a substantially greater thickness between the bottom portion and sealing surface thereof than the thickness of said second seal ring between the bottom portion and sealing surface thereof; (d) said first and second seal rings presenting respective interfitting surfaces interlocked against one another to secure the seal rings together, the interfitting surface of said first seal ring being located intermediate the bottom portion and sealing surface thereof and facing away from the valve chamber; and (e) said second seal ring having an enlarged projecting portion extending away from the interfitting surface thereof and received in an enlarged portion of said groove to secure the seal rings in the groove. - View Dependent Claims (7, 8)
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Specification