초록 ▼

An operating mechanism for a rotary valve comprises a rack 18 reciprocatable within a housing 10 by an actuator 20 axially movable from outside the housing through an access aperture 30. The rack engages a pinion 14 connectable with a valve stem 16. A bellows seal 24 surrounds the actuator and is se

An operating mechanism for a rotary valve comprises a rack 18 reciprocatable within a housing 10 by an actuator 20 axially movable from outside the housing through an access aperture 30. The rack engages a pinion 14 connectable with a valve stem 16. A bellows seal 24 surrounds the actuator and is sealed at one end to the rack and at the other end to the housing about the aperture to prevent escape of any noxious fluids which might escape past the valve gland into the operating mechanism housing when sealingly mounted to the valve body.

대표청구항 ▼

In an operating mechanism for a rotary valve comprising a main housing having an access opening; a rotatable operating stem for said valve; a rigid elongate actuator member provided with a control portion projecting through said access opening; drive means whereby the operating stem is rotatable res

In an operating mechanism for a rotary valve comprising a main housing having an access opening; a rotatable operating stem for said valve; a rigid elongate actuator member provided with a control portion projecting through said access opening; drive means whereby the operating stem is rotatable responsive to reciprocating movement of said actuator member; means for reciprocating said actuator member, such means cooperating with said control portion at a location exteriorly of said main housing; and a tubular flexible sealing bellows surrounding said actuator member, said bellows extending lengthwise of the actuator member and having one end thereof sealingly secured to said main housing about said access opening and the other end thereof sealingly secured relative to the actuator member; the improvement in that said drive means comprises a rack secured to the actuator member to be reciprocatable within the main housing; pinion teeth associated with said stem, the rack comprising a toothed member carrying rack teeth engaging said pinion teeth; the said toothed member is tubular with the actuator member extending therewithin to define therewith the walls of an annular space between the actuator member and the tubular member, said bellows being received in said annular space; and the said walls of said space are closely spaced from the internal and external surfaces of the convolutions of the bellows to provide support against deflection thereof.