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)
There are certain people that feel cold all the time and remain wrapped up in a sweater while all the others around them enjoy a nice breeze. If a person is feeling cold all the time, this is usually linked to one of numerous underlying medical conditions.Oneâs sensitivity and response towards cold is totally individual and it varies from person to person.old Hands: Raynaud's Disease And Other Causes. Raynaud&#039;s disease is a disorder of blood vessels that causes abnormal narrowing of these vessels when a person is cold or in the state of stress. The process of narrowing of blood vessels is called vasospasm.