Valve facing for sliding valve elements or the like
AssigneeMueller Co.
InventorsFred S. Whisenhunt, Lloyd J. Street
Life of this patent
Estimating the term…
Abstract
An improved valve facing for one member of relatively sliding gate valve members. More specifically, the improved valve facing has foamed polymeric core and an impervious and solid polymeric outer surface. This combination provides the necessary resilient and deformable characteristics for effecting a long-life seal between the sliding members of the gate valve. When the valve is a drain valve of a fire hydrant most unexpected results are obtained.
Claims25
In a valve assembly subject to liquid under high pressures, said valve assembly having valve members including a valve seat and a valve element which is slidably movable relative to the valve seat to open and close the valve assembly and a resilient and deformable valve facing on one of the said valve members whereby the valve facing contacts the other valve member when the valve assembly is closed to tightly wedge and seal the closed valve assembly against liquid leakage,
- the improvement wherein the valve facing comprises a resilient and deformable foamed polymeric core and an impervious, abrasion resistant solid polymeric outer surface which overlays the foamed core at every point where the valve facing contacts the other valve member and the ratio of the thickness of the foamed core to the thickness of the outer surface is about 0.5:1 up to about 5:1.
In a valve assembly subject to liquid under high pressures, said valve assembly having valve members including a valve seat and a valve element which is slidably movable relative to the valve seat to open and close the valve assembly and a resilient and deformable valve facing on one of the said valve members whereby the valve facing contacts the other valve member when the valve assembly is closed to tightly wedge and seal the closed valve assembly against liquid leakage,
- the improvement wherein the valve facing comprises a resilient and deformable foamed polymeric core and an impervious, abrasion resistant solid polymeric outer surface which overlays the foamed core at every point where the valve facing contacts the other valve member, the ratio of the thickness of the foamed core to the thickness of the outer surface is about 0.5:1 up to about 5:1 and thus providing sufficient compressiveness and sufficient outer space material to allow for loss thereof by abrasion.
Dependencies are inferred from the claim text.