This post about isolation valves is from the 2018 category from the Isolation Valve Supplier – Zero Leakage Isolation Valves | CGIS.
Isolation valves can be classified into two large groups depending on the movement they perform to block the fluid. Linear insulation valves are those whose movement of the axis is performed vertically from top to bottom for the closing action and from bottom to top for the opening action. They are characterized by slow closing and opening movements and actuated by a multi-turn steering wheel.
They are essential when dealing with compressible fluids, such as steam so that the slow closing does not cause hydraulic phenomena that could damage the valve and the general system.
The revolving isolation valves are those whose movement of the axis is carried out in a rotating way at 90 degrees as a total stroke. They are characterized by fast closing and opening movements. These units are used to transfer non-compressible fluids in a liquid state and at low exercise pressures. The drive control is usually a grip lever.
With the Linear Insulation Valves from CGIS, it is possible to list the following types of valves as the most common: balloon valves, gate valves, diaphragm valves and guillotine valves. Rotary insulation valves incorporate ball valves, male valves, and butterfly valves.
Other common classification of the isolation valves can be found based on the type of actuation of the same. The manually operated valves are the simplest, the plant operator must manipulate them by hand, and the action is not carried out very often since the process does not require it.
Self-acting valves are normally used in places with limited accessibility and where the repetition of cycles is higher and dependent on some parameter of the process (control of temperature, pressure, level, flow).
Valves activated by auxiliary energy are characterized by an external power source that causes the movement of the shaft. This can be electrical, pneumatic, hydraulic and hydro-pneumatic as the most common. They are used for the automation of industrial processes of high repetition and accuracy in the control.
Valves were already used in Roman times and the period of Islamic colonization as shown by the vestiges of rudimentary stone objects that served to interrupt or divert the flow of water. However, the true appearance of isolation valves dates back to the time of the Industrial Revolution and the use of steam as a form of energy capable of keeping machines running.
It is from the twentieth century that the development of the valves from their primitive designs to the sophisticated started happening. In a hydraulic system of pipes, there are three major elements: the pump that produces the necessary pressure to drive the fluids, the pipes that contain these fluids and, naturally, the valves, which in charge of controlling the fluids. Without the existence of the valves, the fluids would travel through the pipes without the possibility of being used for their purpose.
Valves are mechanical devices whose function is to control fluids in a pipe system. They are a component of pipes that allows users to channel the fluids by opening, closing or partial obstruction of the area of passage.
Valves regardless of their type have some common parts necessary for the development of their function. Some common parts include an axis, which is also called spindle. The part that drives and sets the shutter. The seat is the part of the valve where the closure is made by contact with the plug. Body and Cover: Pressure retaining parts protect the internal parts of the valves.
Bolts – these are the elements that join the body and the valve cover together. To ensure the atmospheric tightness it is necessary to place joints between these two metallic surfaces, Ends -part of the valve that allows connection to the pipe, which can be flanged, welded, threaded or grooved to allow the valve to be coupled to the pipeline only by external joints.