Seat for butterfly valves

Claim 2

An improved seat for a valve comprising: an outer tubular line of relatively hard inflexibe material having an outer circumference configured to be slidably received in a valve body; an inner tubular member of resilient material bonded to said outer liner internal circumferential surface, the inner resilient member having an integral reduced internal diameter seating portion providing a reduced diameter seating surface; and means extending between the outer circumferential surface of said liner and the outer circumference of said inner member in the proximity of said reduced internal diameter seating portion of said inner member for transmitting head to said inner member during bonding thereof to the liner.

Claim 3

An improved seat for valves according to claim 1 wherein said heat transmitting means includes spaced apart apertures in said liner positioned between the inner and outer circumferential surfaces thereof and opposite said resilient tubular member reduced internal diameter seating portion, whereby portions of said inner resilient member fills said apertures for transmitting heat to said inner member during said bonding operation.

Claim 4

An improved seat for valves according to claim 1 wherein said heat conducting means includes spaced apart apertures in said liner communication the outer with the inner circumferential surface thereof, and including: an insert of heat conducting material positioned in each of said apertures for transmitting heat to said inner member during said bonding operation.

Claim 5

An improved seat for valves according to claim 3 wherein each said insert has an integral enlarged diameter portion of said heat conducting material on the end thereof contacting said resilient inner member.

Claim 6

An improved seat for valves according to claim 3 wherein each insert is carried by a common ring of heat conducting material and extending radially outwardly therefrom, said ring being disposed adjacent the resilient inner member opposite said reduced internal diameter seating position.

Claim 7

An improved seat for a valve comprising: an outer tubular liner of relatively hard inflexible material having an outer circumference configured to be slidably received in a valve body; an inner tubular member of resilient material bonded to said outer liner internal circumferential surface, the inner resilient member having an integral reduced internal diameter seating portion providing a reduced diameter seating surface; and thermal communication means between the outer circumferential surface of said inner and said reduced internal diameter seating portion of said inner member, said thermal communication means including spaced apart apertures in said liner communicating the outer with the inner circumferential surface thereof, and including: a thermal transmitting insert positioned in each of said apertures, each of said thermal transmitting inserts being of metal.

Claim 8

An improved seat for a valve comprising: an outer tubular liner of relatively hard inflexible material having an outer circumference configured to be slidably received in a valve body; an inner tubular member of resilient material bonded to said outer liner internal circumferential surface, the inner resilient member having an integral reduced internal diameter seating portion providing a reduced diameter seating surface; and thermal communication means between the outer circumferential surface of said inner and said reduced internal diameter seating portion of said inner member, said thermal communication means including spaced apart apertures in said liner communicating the outer with the inner circumferential surface thereof, and including: a thermal transmitting insert positioned in each of said apertures, each of said thermal transmitting inserts being of metal.