Author:Site Editor Publish Time: 2019-10-22 Origin:Site
In recent years, with the continuous improvement of China's comprehensive national strength, the development of China's marine industry has also achieved rapid progress. In this context, the shipbuilding industry has drawn much attention.
List of content for this article：
1. The marine valve play an important role in the marine piping system,
2. The common analysis of several difference valves
China has invested a lot in the manufacturing of marines and the harvest is also significant, but as a small part of the entire shipbuilding, pipeline valve technology is a part that is easily forgotten by most people, but its important role that no one can ignore it.
In the entire marine piping system, the valve not only has the effect of connecting and cutting, but also can effectively control the key details of the medium flow rate, flow direction, pressure and even stability. In the current general marine pipelines, the types of valves we usually see are: safety valves, boost valves, pressure reducing valves, globe valves, check valves, stop check valves and gate valves.
The common analysis of several difference valves
Usually, the check valve we say is a check valve. Its main function is to let the medium inside the pipe pass only in one direction. If you want to reverse flow, it is impossible. Let's take a lift check valve as an example of its use points. First of all, the lift check valve can only be installed on the horizontal pipe, that is, the horizontal pipe, which is basically not used in the vertical pipe installation. Secondly, the gasket and connection method should be correctly selected when connecting the lift check valve, and the appropriate type should be selected for installation according to the influence of its working pressure and working temperature. Finally, during the installation process, the flow direction of the medium must be clarified to ensure that the arrow on the check valve and the flow direction of the medium are consistent. If the label is unclear, it must be installed according to the principle of low entry and high.
The shut-off valve is a particularly versatile valve that we can often see in our daily life. It is mainly used to connect the medium in the pipeline or the medium in the cut-off pipeline. It is generally divided into two types, right angle cut-off valves and through-cut valves. Although the shut-off valve is one of our most common types, there are still some places that we need to pay attention to during its use and installation. For example, we also need to consider his working pressure, working temperature and other conditions to choose the correct one. Type and connection form. Above the shut-off valve, the direction of the flow of the medium and the direction of the arrow are also required to be consistent. There is also a general reference here, that is, all the shut-off valves have their handwheels closed in the clockwise direction and counterclockwise, which is suitable for any position.
The gate valve is divided into two types: the valve stem ascending type and the valve stem fixed type according to the position of the valve stem during its operation. It is the most widely used one-stop valve part. Although it can also be called a shut-off valve, the advantage of the gate valve and the shut-off valve is that the flow area of the gate valve is large and the flow resistance is relatively small, and the gate valve is independent of the inlet and the outlet, and the medium can be from either side. Passing, because the structure length of the gate valve is short, the switch is more labor-saving. Of course, the gate valve also has some disadvantages. For example, the friction between the valve core and the valve seat is easily damaged, and the sealing ability is easily broken, so that it is not suitable for a large pressure.
The valve box is generally divided into three types: a suction valve box, a discharge valve box, and a regulating valve box according to the purpose. The valve box is for centralized control, combining two or more valve parts into one integrated box. Some valve boxes are integrally cast from cast iron and some are formed by connecting valve. The suction valve box is characterized in that the lower part is separately sucked and then discharged from the upper part, and the discharge valve box is characterized in that the lower part is partially sucked and then discharged by the upper part.
The valve disc of the butterfly valve rotates around the valve stem. It is generally controlled by a butterfly-shaped valve disc and an upright valve stem to control the valve. A relative advantage of the butterfly valve is that it is easier to control automatically because the butterfly valve is normally controlled directly by the rotating valve stem. The way to automatically control the butterfly valve is generally divided into electric and pneumatic. The upper end of the butterfly valve is usually equipped with an angle indicator, so that the opening and closing state of the valve can be easily understood.