| 摘要 |
A pneumatically operated device (12). The pneumatically operated device comprises a movable (104) member disposed within a housing (90). The movable member is operable to control operation of the device. Pressurized air (62) is directed to a first side (126) of the movable member to drive the movable member in a first direction to operate the device. The pneumatically operate d device comprises a check valve (184) disposed through an opening (186) in th e housing to enable air to vent from a second side (118) of the movable member . The check valve may comprise a flexible cover (190) extending over the openi ng and biased against the housing to form a seal. |
