There are many types of valves used in industries. Some valves are simple, but some have a complicated mechanism that can adjust the flow according to changing environmental conditions. Irrespective of their structure and working, their main task ...

These are enlarged and twisting veins that appear bluish or purplish due to faulty veins supplying blood in the wrong direction. Which means the blood does not flow effectively, as it should. The apparent symptoms may include swollen & aching ...