The control pressure at which a pneumatic device first begins to deliver an output.
                                                            
                                                     
                        
                                                
                        
                        
                            Pressure at which a suit's exhaust valve begins to crack open, releasing inner air to the atmosphere outside the suit. Important for determining how much a fully encapsulating suit will "balloon" before releasing air. Go to top
                                                            
                                                     
                        
                                                
                        
                        
                            A term used in back pressure control only (i.e. back pressure regulators, relief valves) for determining the inlet pressure at which flow starts.