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Do you know the necessary knowledge of all welded ball valve?

Release date: [July 18, 2019] click through rate:

All welded ball valve The service life is much longer than cast steel ball valve. All welded ball valve is widely used in city gas, city heating, petrochemical, shipbuilding, steel, pressure regulating station, power plant and other pipeline equipment.

   Installation knowledge of buried all welded ball valve

1) hoisting. The valve should be hoisted in the right way. In order to protect the valve stem, do not attach the chain to the handwheel, gearbox or actuator. The protective caps at both ends of the valve sleeve should not be removed before welding

2) welding. The connection between directly buried full welded ball valve and main pipeline shall be welded. The quality of weld meets the standard of "radiography of welding joint of disk bend fusion welding". Generally, one-time welding can not fully guarantee the qualification. Therefore, when ordering the valve, the manufacturer shall require the manufacturer to add 1.0m long sleeve pipe at both ends of the valve. Once the weld is unqualified, there will be enough length for unqualified welding When welding the ball valve and the pipe, the valve should be in the 100% full open position to avoid the valve ball being damaged by the spatter welding slag, and ensure that the temperature of the valve internal seal does not exceed 140 ℃, and appropriate cooling measures can be taken if necessary

 All welded ball valve

3) valve well masonry. Direct buried all welded ball valve adopts special

The structure design has the characteristics of maintenance free. Before burying, Pu special anti-corrosion coating is applied on the outside of the valve. At the same time, three injection pipes, namely valve seat and valve stem for emergency grease injection, cavity vent pipe and valve stem are appropriately extended according to the depth of the bare ground, so that the staff can complete all operations on the ground. After the direct burial, it is enough to build a small valve hand well, as shown in Fig. 4 However, the conventional non fully welded ball valve can not be directly buried, and large valve wells need to be built. As a result, dangerous confined space is formed, which is not conducive to operation. At the same time, the service life of the valve body and the valve body will be affected

   Daily maintenance of buried all welded ball valve

Frequent operation of the valve can not only prevent the accumulation of impurities on the surface of the valve seat or ball, but also avoid the local excessive wear of the seat insert

1) when the valve is put into operation, the valve ball shall be fully open or fully closed, and shall not be in the half open or half closed position, so as to avoid damage to the valve seat.

2) opening and closing time requirements. If the valve is opened and closed too fast, it will cause the valve to twist too much and the valve stem will be damaged. If the valve is opened and closed too slowly, the valve seat surface will be eroded by medium for a long time. Therefore, the operating time should be kept within a proper range. According to experience, the lower limit of valve opening and closing time (seconds) can be controlled by half of the valve nominal size (inch), and the upper limit can be set as per the valve diameter Weigh 5 times the size (inch) to estimate


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