2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16
In all pipelines, without exception, the product is transported under a certain pressure. In order to block its flows, valves are used, and an adjustable valve is one of its varieties. With it, you can narrow to a minimum or expand to a maximum the cross-sectional area in the pipe. Accordingly, the product, whether it be water, alkali or oil, will flow in a small stream or be thrown out of the tap under pressure. It should be noted here that the adjustable valve does not serve to shut off the flow completely and then open it. For this, shut-off valves are used. It is needed solely to control the pressure force in the system.
Types of control
If in a domestic pipeline an adjustable valve is under manual control, then in industrial operation various types of drive mechanisms are used. Sensors are attached to the fittings, which take indicators of the state of the transported product. The received information is transmitted to the microcontrollers connected to the drive, which starts on their signal. Hemoves the adjustable valve to a new position. Types of control depend on the drive mechanism:
- Pneumatic drive.
- Electromagnetic drive.
- Electric.
- Drive with hydraulic mechanism.
Manual control is still used in some plants, but it is becoming rare. But the motorized control valve has the widest range of industrial applications.
From the drive force is applied to the shutter of the adjustable valve. It consists of two elements: a seat and a plunger. The saddle is in the body in a stationary state. But the plunger controls the flows. When it narrows the cross section, the velocity of the liquid or gas and the pressure in the pipeline change. If the plunger enters the seat, then the cross section becomes minimal. High-capacity pipelines use double-seat valves for better pressure control.
Economic factors
The cost-effectiveness of using certain valves depends on many factors, including the type of fastener. It can be welded, nipple, flanged, mounted on a coupling or pin. The reliability of the connection makes it possible to operate the control valve for a long time. The cost of installation, the complexity of maintenance and care of drive mechanisms ultimately determine the profitability of the pipeline. The welded joint is reliable and inexpensive, but using itonly available for steel valves.
Design differences
Despite the apparent similarity with valves, adjustable valves have their own design features. First of all, you should select an option with a given flow direction. Next, you should pay attention to which section of the pipeline you need fittings. If it is intended for a flat, non-changing track, then a globe valve will do. In systems with bends, angular structures are used. There are mixers with several nozzles. For example, a three-way valve has two inlets and one outlet.
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