Regulating fittings is a wide range of functional structures designed to distribute flows and block working liquid media, regulate the parameters of individual technological processes. In particular, changing the parameters of pressure, temperature, pressure, the amount of supplied substances is carried out by changing the flow rate of the transported media. Control valves are installed in piping systems, tanks and units where distribution or shutdown of used or transported media is required.
Main types of fittings
- Control valves - the main purpose is aimed at regulating the specified parameters of working media. Includes all kinds of bypass, balancing and reducing valves.
- Isolation valves - used to shut off flows when moving media. Among the most common types of valves, it should be noted: valves for shutting off fluid flows, ball valves, wedge-shaped valves, valves.
Elementscontrol valves
Control valves operate on the basis of the following elements:
- control valves;
- mixing valves;
- control valves;
- direct acting pressure regulators.
Destination
Control valves are used to maintain the necessary, setpoints of certain technological processes by regulating the flow of specific working media.
According to the design, control valves are practically indistinguishable from shut-off valves. In some systems, the same control valve can be used for its intended purpose and as a stop valve.
Varieties of control valves
- Photo-separation - used when it is necessary to separate working environments that are in different states.
- Condensation - used to eliminate condensate, limited passage or overlap of superheated steam flows.
- Protective shut-off and control valves - aimed at automatic protection of pipelines and equipment from unforeseen or unacceptable changes in the functioning of the pipeline system.
- Control room - designed to control the flow of working media into measuring and control devices.
- Mixing and distribution - distributes individual flows of working media in various directions or takes a direct part, if necessary,mixing.
- Throttling - used when it is necessary to reduce the pressure of working media in systems that operate in conditions of significant sudden pressure drops.
- Non-return - reverse fittings, in which forced opening, restriction or closing of the stroke is possible.
Features of choice
Since in most cases the efficiency, high stability of the entire pipeline system depends on the level of reliability and durability of the fittings, the most important point is its choice. The following points should be noted here:
- Adjustable valves should be selected based on the determining operating conditions: the nature of the working environment, temperature, pressure indicators in the system.
- It is important when choosing a control valve that its characteristics correspond to the nominal diameter of the passage.
- Before leaning towards buying valves, it is necessary to clarify the method of its control: remote, manual, based on electric, hydraulic or pneumatic drive.
- Initially, you should decide on the case material: cast iron, stainless steel, bronze, etc.
- Fittings are purchased depending on the purpose of individual elements: adjustable or safety valve, valve, gate valve.
- The geometric parameters that distinguish control valves are important: length, height, types of flanges, dimensions and number of bolts, etc.
- Necessarycheck in advance the compliance of the characteristics and parameters of the selected fittings with the specified requirements and operating conditions of the pipeline system.
