Abstract: A dual seal assembly for providing a seal between a reciprocating rod and the gland is described. The dual seal includes first and second axially adjacent annular seal elements. The first seal element is constructed of a material having a different hardness than the material forming the second seal element. The first and second seal elements each include a seal edge contacting the rod to provide a respective seal between the first and second seal element and the rod. At least a portion of one of the first seal element and the second seal element engages the gland to form the seal between the rod and the gland. By varying the hardness of the materials forming the seal elements, the first seal element and the second seal element can be configured to provide different functions within the dual seal assembly and can cooperatively provide an effective fluid seal under a wide range of operating conditions.

Abstract: A dual seal assembly for providing a seal between a reciprocating rod and the gland is described. The dual seal includes first and second axially adjacent annular seal elements. The first seal element is constructed of a material having a different hardness than the material forming the second seal element. The first and second seal elements each include a seal edge contacting the rod to provide a respective seal between the first and second seal element and the rod. At least a portion of one of the first seal element and the second seal element engages the gland to form the seal between the rod and the gland. By varying the hardness of the materials forming the seal elements, the first seal element and the second seal element can be configured to provide different functions within the dual seal assembly and can cooperatively provide an effective fluid seal under a wide range of operating conditions.

Abstract: A dual seal assembly for providing a seal between a reciprocating rod and the gland is described. The dual seal includes first and second axially adjacent annular seal elements. The first seal element is constructed of a material having a different hardness than the material forming the second seal element. The first and second seal elements each include a seal edge contacting the rod to provide a respective seal between the first and second seal element and the rod. At least a portion of one of the first seal element and the second seal element engages the gland to form the seal between the rod and the gland. By varying the hardness of the materials forming the seal elements, the first seal element and the second seal element can be configured to provide different functions within the dual seal assembly and can cooperatively provide an effective fluid seal under a wide range of operating conditions.

Abstract: An integral sealing system for a cylinder or piston rod and the like, for bearing, sealing and wiping a piston rod during reciprocating motion, is a molded polymeric unit. The integral system includes a body terminating at one end in a divergent pair of generally axially-extending annular tapered lips, the outer surfaces of the pair of lips defining sealing surfaces. The body of the integral system terminates at the other end in an inwardly tapering surface and protruding lip for wiping of the rod surface to exclude contaminants.