A checkpoint is a control or supervision.
Retain is a concept with several uses. In some countries , the term is used to refer to a position that allows supervision or certain control . For example: “When we arrived at the checkpoint, they asked us for our documents and only then did they allow us to continue moving” , “We were detained for two hours at a checkpoint”, “The police set up a checkpoint to control the vehicles entering and leaving the city” .
An example of a checkpoint is found at the checkpoints that exist at the entrance to a football stadium. Before people can enter, they must go through a checkpoint where a police officer or other security agent checks them carefully and following different protocols, to verify that they do not access the property with weapons or alcoholic beverages, to name two of the objectives of these types of security procedures.
In the military context, the retainer is a troop that serves as reinforcement of a military post at certain particular times. This allows for improved custody at night or on another occasion that requires some type of special measure.
Retainer as part
The part that prevents something or that serves as a replacement for something else is also called a seal. In motors and gearboxes that must have permanent lubrication , the seal is the part that prevents lubricant loss from internal combustion engines or gearboxes to the outside. Thanks to the seal, the useful life of the different engine components is extended as it minimizes the possibility of damage to the device .
The seals are installed with special tools so that they can be positioned correctly in the location without causing damage to the lip , and are held with elastic washers called circlips (also known as seegers ). The lips of a seal are each of the parts that protrude from its inner ring, each end of the channel that can be seen if you look at it from the center outwards.
A piece that fulfills a mechanical function is called a seal.
Your placement
To place a seal it is very important to lubricate it properly, with the aim of reducing friction when the piece slides, and for this you can use oil or grease. Thanks to this prevention measure, both the surface on which you rest and your lips are protected; This is a fundamental step, which must be carried out with great precision, since a slight error can cause serious problems once the machine is put into operation.
Typically, the seal is made from a synthetic rubber compound , a material that has the property of returning to its original size after withstanding considerable elastic deformation , something that does not occur with most alternatives.
Uses of a retainer
Pumps and turbochargers also use parts similar to the seal that are called mechanical seals and are made of metal, graphite or ceramic (or combining some of these materials) to avoid the complications that occur when the rubber is subjected to solvents or temperatures. high. The turbines and machines used for the movement of solids in powder or grain use seals to prevent particles from entering from outside.
In other words, the use of the seal can have two basic objectives: that some essential element for the correct functioning of a machine escapes, such as the lubricating liquid; or harmful particles entering an engine and damaging it. Although both purposes may seem opposite, they seek nothing more than to preserve the integrity of a structure that can only operate correctly if certain rules are met.