A check valve, clack valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave.
Some causes of cold intolerance are: 1  Anemia. 2  Anorexia nervosa. 3  Blood vessel problems, such as Raynaud phenomenon.  Chronic severe 1  illness. General poor health.  Underactive thyroid 1  (hypothyroidism) Problem with the hypothalamus (a part of the brain that controls many body functions, including body temperature)
A common cold can even be fatal to the most vulnerable members of society if it turns into a serious chest infection like bronchiolitis, caused by the respiratory syncytial virus (RSV). Adults . With the common cold, you are not likely to experience a high fever or be sidelined by fatigue. These are symptoms commonly associated with the flu. So, see your doctor if you have: cold symptoms that last longer than 10 days; fever of 100.4Â°F or higher; a fever with sweating, chills, or a cough that produces mucus; severely swollen lymph nodes