Bleed is a valve for draining of liquids off of a line. It is located at the bottom of the pipe and can be used to drain the line after hydrotest, confirmation of isolation in a double block and bleed set up, testing of a check valve.
A bleed valve, also called bleeder valve or purge valve, is a type of valve used in various systems to release excess pressure or to drain fluid or gas from a system. The primary purpose of a bleed valve is to remove unwanted substances, such as air or gas pockets, from a system. This is commonly done in hydraulic and pneumatic systems, as well as in heating and cooling systems.
In hydraulic and pneumatic systems, air can accumulate in the fluid, leading to reduced efficiency and potential damage to components. Bleed valves allow for the controlled release of trapped air, ensuring the proper functioning of the system. In heating and cooling systems, bleed valves are often found in radiators or baseboard heating units. These valves allow trapped air to escape from the system, improving the circulation of hot water or steam and enhancing the overall efficiency of the heating system.
The design of bleed valves can vary, but they typically consist of a valve mechanism that can be opened to release the trapped substance and closed to maintain system integrity. Bleed valves may be manual or automatic, and they play a crucial role in maintaining the optimal performance of various mechanical systems.