Fluid control valve assemblies for use in fire protection sprinkler systems to control the flow of firefighting fluid to the system sprinklers. The assemblies include a pressure-operated fluid control valve having an internal fluid chamber in which fluid contained therein acts on an internal diaphragm to control the flow of fluid from an inlet to an outlet of the valve. An environment-responsive control device in fluid communication with the internal fluid chamber along a first fluid communication line controls the flow of fluid out of the fluid chamber to initiate actuation of the valve. A fluid-flow latch in fluid communication with the outlet of the valve along a second fluid communication line subsequently controls the simultaneous flow of fluid out of the fluid chamber and the actuation of the valve.

A vehicle fire-extinguishing and passenger-cooling device includes a fire-extinguishing fluid spray device and a cooling gas discharge device. In the event of a vehicle fire occurring in a seat on which a passenger is seated, the fire-extinguishing fluid spray device sprays fire-extinguishing fluid around the passenger, and the cooling gas discharge device discharges, to the passenger, cooling gas to minimize burns caused by flames. As a result, the vehicle fire-extinguishing and passenger-cooling device protects the passenger from the vehicle fire and encourages the passenger to rapidly escape from a vehicle.