The Installation and Operation of the Y Globe Valves

Valves are widely used in oil, chemical, power, water conservancy, urban construction, machinery, coal and other industries. The valve is widely used, and its role is also very important. The selection and installation of valves must be serious and responsible, especially for modern industrial production and construction.
 

1.1 The assembly of the valve

To facilitate the disassembly of the valve, a retainable telescopic device is generally installed on the side of the valve and the pipeline. Some companies replaced it with a single disc coupling for valves with a DN less than and equal to 400mm. Don’t bring the valve to the construction site too early. Pipeline construction is a long process. If you bring the valve and other subsidiaries to the construction site when you start the process, the valve will be exposed to the sun in the construction site for several months, and the problem was easy occur. It is recommended to move the valve to the construction site after the construction of the pipeline is completed. After the tube's debris is removed and the valve shaft is installed.

1.2 The operation of the valve

The opening and closing of the valve are not only related to selection, good quality, careful construction and installation of valves, but also thoughtful management. Good operation management is reflected in the following three aspects: complete technical data, thoughtful operation management of valves and good conditions of the valve.

1.2.1 Operation management of valves 

The requirement for valve operation management include that the valve should be closed well; the packing of the valve shaft rod does not leak; the valve can be opened or closed easily. The daily work of valve operation management includes the reference records and improvement of the reporting forms of the valve thermal opening and closing operation form. The opening record of the valve should be regularly inspected. For valves that have not been operated for a long time, it is necessary to perform different weekly inspection cycles according to the size. 

Clarifying the procurement unit of the valve

The manual valve with a DN less than and equal to 400mm invested by the company should be ordered by the supply and marketing company. Other valves are purchased by the equipment department, or the supply and marketing company is commissioned by the equipment department. Other units shall not sell valves. 

1.4 Maintenance of valves

The maintenance of valves can be divided into two cases: one is keeping and the other is using.

1.4.1 Storage and maintenance

The purpose of storage and maintenance is to prevent the valve from being damaged in the storage or reducing quality. Improper storage is one of the important causes of valve damage. The valve storage should be organized. The small valve is placed on the shelf. The large valve can be arranged neatly on the floor of the warehouse. Do not stack it. Do not let the flange touch the ground. This is mainly to protect the valve. The hand wheels are broken, the stems are crooked and the fixed nuts of the hand wheel and the valve stem are lost due to improper storage and handling. These unnecessary losses should be avoided. For valves that are not used for a short time, asbestos packing should be removed to avoid electrochemical corrosion, and damaging valve stems. For the valve that just move to the warehouse, it is necessary to check it. If there is rain or dirt in the transportation process, clean the valve before keeping it.

1.4.2 Maintenance

The purpose of maintenance is to extend the service life of the valve and ensure the reliability of the opening and closing. Valve screw threads often rub against the stem nuts. Apply a little molybdenum disulfide or graphite powder to lubricate. Rotate the hand wheel regularly for the valve that is not often opened and closed. Add lubricants to the valve stem thread to prevent blocking. Add a protective cover for the stems of outdoor valves to prevent rain, snow, and dust rust. Keep the valve clean. It is necessary to check the valve and maintain its integrity. If the fixed nut of the hand wheel falls, it must be replaced. Otherwise, the four corners in the upper part of the valve stem will gradually lose the complexity of reliability and even cannot be operated. The valve stem should be cleaned frequently, especially the screw thread part. For the lubricant that has been soiled by the dust, it should be replaced with a new one, because the dust contains hard debris. It is easy to wear the thread and the surface of the valve stem, which affects the service life.