stopcock
Introduction
A stopcock or stopcock is a device, generally made of metal, some alloy or more recently of polymers or ceramic materials, used to give way or cut off the flow of water or other fluid through a pipe or conduit in which it is inserted.
These keys are also often called valves, since some of them, in addition to serving to cut off the passage, had the function of preventing water from circulating in the opposite direction to the desired one (reflux), that is, they were also valves in the primitive meaning of the term.
Types of stopcock
Contenido
Las llaves pueden ser:.
seat key
The seat key is the oldest type of key. It has a threaded stem that rotates on its axis "Axis (mechanical)") when the key is operated and seats a seal over the water passage. This model is precisely the one that also served as a valve, since the closure or sole was free (with a pin housed in a hole in the tightening stem), and returned to its seat when the water went in the opposite direction to the one it should, functioning as a piston check valve. Due to the noise they produced, they were no longer used and the solenoid was fixed to the tightening stem.
The importance of this type is that it works better to regulate flow rates in pipes where this use is required (for example, in heating circuits, for hydraulic balancing), because it allows a more refined adjustment, since closing requires more than one turn of the handle. Even better is its variant, the needle key"), in which the closing seat is cone-shaped instead of being flat.
Male or ball wrench
With a frustoconical male or a sphere with a hole that allows the passage of the fluid when it is aligned with the axis of the conduction, with quarter-turn opening and closing. There is a variant, the square wrench, which is usually used next to each water point in the home, before the tap, so that in the event of a faucet breakdown in any appliance, it is not necessary to leave the rest of the wet room or house without water.