A movement detection device includes a self-sustaining movement detection unit which is attached to an operator’s body and detects a movement or a posture of an attached part of the operator’s body. The frame has at least one recess at least partially open for receiving at least a portion of the supply and discharge lines. An input power demand value is calculated for a load demand module based on the output capability value of the received signal. Once ignited, gas generating medium generates gas, which causes the piston to move along the interior bore injecting liquid from the liquid chamber into the bladder to inflate the bladder. The body, valve seat and piston form a valve insert for a valve housing.