Safety Pressure Relief Valve

pressure relief
or ‘weight shifts’ are the methods of relieving pressure over the buttocks whilst sitting in the wheelchair.
Stress management is the amelioration of stress and especially chronic stress often for the purpose of improving everyday functioning.
What you must do to all fuel injection system before cracking a line and opening up the system

safety
A condom
the state of being certain that adverse effects will not be caused by some agent under defined conditions; "insure the safety of the children"; "the reciprocal of safety is risk"
Denoting something designed to prevent injury or damage
a safe place; "He ran to safety"
The condition of being protected from or unlikely to cause danger, risk, or injury
guard: a device designed to prevent injury or accidents

valve
A membranous fold in a hollow organ or tubular structure, such as a blood vessel or the digestive tract, that maintains the flow of the contents in one direction by closing in response to any pressure from reverse flow
a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
A cylindrical mechanism in a brass instrument that, when depressed or turned, admits air into different sections of tubing and so extends the range of available notes
A device for controlling the passage of fluid through a pipe or duct, esp. an automatic device allowing movement in one direction only
device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone
control consisting of a mechanical device for controlling the flow of a fluid