Abstract: The present invention relates to a novel single acting, valve closing actuator that when actuated is capable of closing an attached existing plug or gate valve, one that opens and closes within one quarter turn of operation. The newly designed actuator is cylindrically quadrant shaped and utilizes an extensible air bladder to actuate an internal rigid vane, causing the attached vane shaft to rotate, thereby closing a connected existing valve. In the preferred embodiment, the air bladder is comprised of a laminate of silicone rubber bonded to an exterior coating made of Kevlar. In an alternative embodiment, two air bladders are used to provide a double acting actuator, where a remote valve reset can be accomplished. Independent stand-alone operation is provided by using a pressurized source of CO.sub.2 to inflate the air bladder and a rechargeable battery to operate the air solenoids.

Abstract: The present invention relates to an automatic valve actuating system that is responsive to various externally detected stimuli. The system is comprised of a monitoring and alarm components that close a valve upon the detection of a fault occurring from the undesirable presence of carbon monoxide or combustible gases. Combustible gases, such as, propane, methane, hydrogen and the like can create a hazardous explosive environment, especially when these gases are mixed with the oxygen in the air. The valve actuating apparatus mounts directly to an existing valve, such as one that opens and closes within a quarter of a turn. An audible alarm is given when a hazardous condition is detected. For those who are hearing impaired, an optional visual alarm is also given. A CO.sub.2 cylinder provides a pressure source to operate a pneumatic linear actuator. A low pressure switch sounds a secondary alarm to alert the maintenance personnel to replace the carbon dioxide tank.