A bleed screw is a specialized screw that allows pressure to be relieved from a closed system, such as steam radiators or automobile brakes. It requires a specialized tool to open and can become contaminated over time. Bleeding can be difficult and replacement screws are available if needed.
A bleed screw is a screw that allows people to relieve pressure from a closed system by turning it to create a small outlet. This is known as “bleeding” the system, and when the bleed is done, the bleed screw can be tightened to shut the system off again. A classic example can be found in steam radiators in many regions of the world. They can also be seen in pressurized systems like automobile brakes, as well as other types of hydraulic systems.
The bleed screw usually has a specialized head to distinguish it from other system components. People may need a special key or tool to open it, depending on the design. This ensures that it can only be opened when needed and is not accidentally released. For radiators, a small wrench is commonly used to loosen the bolt.
Closed systems can become contaminated over time, since the seal is not perfect. Water, air, and other materials can get in, making the system less effective and causing problems like shock and poor performance. The user needs to bleed the lines to relieve excess pressure and remove the contaminant. Air in a radiator, for example, can prevent fluid circulation and keep the unit cool. Brake fluid can collect water over time or air can end up in the lines after a service appointment.
Bleeding is often difficult, as the contents of the system can be squirted out under high pressure. The user can place a bag or container around the opening to catch the aerosol and minimize clutter, especially if the contents of the system are potentially toxic. Once the system is fully vented, the operator can tighten the bleeder screw. It is important to use the proper tool to avoid removing it, as this could make it difficult or impossible to open the system again in the event of a repeat build-up of pressure.
Replacement bleeder screws are available, in case someone strips, loses or damages a screw. It’s important to get one the correct size to make sure the seal is tight. Many companies produce standardized screws and openings, and people can bring in the old screw, if possible, to compare with available replacements. It is also possible to order a replacement part directly from the original manufacturer to ensure it is the correct component. In cases where it is impossible to remove an old screw, a technician may drill a new hole in the system and install a replacement screw.
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