| 摘要 |
A diaphragm valve including structure which incorporates a support surface positioned to limit extension away from a main valve seat of a valve seat closure diaphragm. Alternative embodiments have the support surface formed on an insert within the valve housing, and formed as part of the interior surface of a wall of the housing. Alternatives for conveying control pressure to the side of the seat closure diaphragm adjacent the support surface include forming the surface on a body of porous material, and forming the surface with a channel which communicates with a relief port. Inclusion of a support surface minimizes stress and strain in the closure diaphragm when the valve is in an open state, thereby increasing the allowable valve working pressure.
|
