초록 ▼

An inverted bellows valve has a two-piece stem interconnecting the valve and actuator for reciprocating axial movement of the stem tip. Tapered surfaces are advantageously utilized between cooperating elements for self-centering the valve assembly. An annular gland disposed along the exterior of the

An inverted bellows valve has a two-piece stem interconnecting the valve and actuator for reciprocating axial movement of the stem tip. Tapered surfaces are advantageously utilized between cooperating elements for self-centering the valve assembly. An annular gland disposed along the exterior of the valve stem has concentric inner and outer O-rings which permit the stem to float and compensate for misalignment. A wobble collar is also disposed in abutting engagement with the stem to compensate for uneven spring forces which could otherwise cock the stem. The bellows subassembly is removable in one piece to facilitate maintenance and replacement.

대표청구항 ▼

A bellows valve comprising: a valve body having an inlet passage, an outlet passage, a valve chamber in fluid communication with said passages, and a valve seat interposed between said passages; a stem including first and second coaxial portions, one end of said first stem portion being selectively

A bellows valve comprising: a valve body having an inlet passage, an outlet passage, a valve chamber in fluid communication with said passages, and a valve seat interposed between said passages; a stem including first and second coaxial portions, one end of said first stem portion being selectively cooperable with said valve seat for controlling fluid flow between said passages; a bellows surrounding a portion of said first stem portion and sealingly isolating said stem from system fluid passing through said valve chamber, whereby the system fluid is adapted to exert an external compressive force on said bellows; said valve chamber having an open end adapted to receive said first stem portion; an actuator housing removably connected to said valve body, said actuator housing receiving means cooperating with said stem second portion for reciprocating said second stem portion in a first direction in response to first force means for shifting said first stem portion one end into sealing relation with said valve seat and in a second direction in response to second force means for shifting said first stem portion one end to a non-sealing relation with said valve seat, one of said force means including means compensating for uneven force generated thereby for preventing eccentric loading of said stem.