A gate valve is used to switch the flow of a pipeline. Narrowed variants are distinguished, where the diameter is much narrower than the same parameter at that point of the system. In which the element is installed. The full bore model has similar diameter parameters to the size of the pipeline. There is also a division according to the format in which the shutter is made. So gate valves can be wedge-shaped and parallel.In the first version, overlapping occurs due to the redirection of the gate, which becomes perpendicular to the product itself .
Such means are appropriate in water pipelines, non-aggressive environments associated with ammonia gases, oil, etc. The wedge is allowed solid, in this case it will most likely be flexible. Double-disc models are also possible, which are more rigid. Almost all elements of the device are made of high-strength steel with high quality parameters, this is necessary in order to replace the stuffing box packing when the valve opens.
The second option is a parallel valve. In this device, the shutter itself is placed parallel to the seals. This unit can consist of one or two disks. The spindle in the specified model can be extended or rotated. The way the valve interacts with the entire system depends on all this. The retractable models are large in size, while the second option does not require lubrication, making it ideal for transporting water and oil.
There are also steel and cast iron valves. Steel is recoverable and suitable for use in non-aggressive conditions. Cast iron - ideal for completely blocking the flow. Suitable for temperatures up to 225 degrees Celsius.
Gate valves can be operated in tandem with electric actuators . Divide multi-turn general industrial models as well as explosion-proof valves.
Electric actuators are used for the following purposes:
- Remote (control panel) management of opening and closing the stream.
- Remote or manual movement of the valves.
- Automatic shutdown of the engine by means of the clutch.
- Notification on the control panel about unwanted or dangerous for the system operations, flow parameters.
- Auto shutdown at extreme rates.
- Autoblock under predetermined conditions, etc.
Source: www.rosarm.su.
