| 摘要 |
<p>A fluid flow control valve having a seat ring which provides a seal between the body and the movable valve member and which is provided with a sediment guard made of resilient material which prevents accumulation of sediment in the body recess within which the seat ring is accommodated. Preferably the guard is a tube made of resilient material (e.g., synthetic rubber). Also improved seat ring spreader means that can be readily installed as the valve is assembled.</p> |
