For rising stem wedge gate valve, the valve in the open, the guanzhong due to corrosion, wear, or improper operation of the connection between valve stem and valve core, valve core loss happens every year. After the valve closed cannot open, only cut it from the system after the change; If you can't cut out from the system, only the receiving process or equipment downtime. 1. Repair methods for valve core loss and cannot cut out handle, can be in the airtight medium under the condition of seal, valve body, valve core and valve seat, change the valve cover, stem, sheath, packing and gland assembly way, exposed the valve core, and then through routine method to connect the valve stem and valve core, so that you can continue to guarantee the three sealing of the valve, the valve to open. After removal of the cover in addition to the special valves, valve core wedge Angle in friction Angle domain, no matter how two end face pressure valve core, under the condition of self-locking valve core is not squeezed out from the seat itself, for the flat valve core is more there is no crowding out. 2. Steps ( 1) To stem wedge gate valve as an example, when the valve stem and valve core connection fails, turn the handwheel can still, through the handwheel will top back seat the Industrial Valves core to ensure that the valve core and valve seat seal between the two seal face, this is the premise of applying this method of repair. Unscrew the valve packing gland nut first, put the stuffing to panasonic, and then, in turn, will cover all the bolt nut loosen a few on the buckle, but not completely off. ( 2) Shut down according to the direction to turn the handwheel when stem move won't happen again, but the cover more than part of the whole body relatively separated, the link operation is observed between the two sealing face of valve core and valve seat seal is sealed, if not closed tight, there is leakage of medium, as long as the quantity is not big, in a relatively short time will not affect the field construction process, can will all bolt nut unscrewing, completely remove the valve cover above part and the valve stem, exposed to the top of the seat of the valve core, check the original connection of valve stem and valve core, and the causes of failure, to develop solutions. ( 3) Above will cover part of the valve stem gently rotating, exit from the stem nut and stuffing box, at the same time also will stem nut lock nut screw down, remove the handwheel and stem nut. Don't limit can turn freely. ( 4) Will remove the valve stem and valve core alone to connect, general valve stem and valve core recovery connection using welding method, this method is well applied in the line of valve core is easy to fall off, air line and steam line, even if the valve core seat sealing is not tight, there is leakage of medium, as long as does not affect the construction, all can use. Oil and gas valve repair directly the medium of welding is very unsafe, can remove the stem end first special forms of post-processing as needed when installation, the valve stem and valve core connection interface with high strength adhesive repairing adhesive processing, or at the top of the valve core field drilling tapping, stem end connection and form a complete set of processing thread, then the connection. It is important to note that the valve stem and valve core to reconnect after installation, the valve stem and valve cover installation horizontal to vertical, it is better to neutral, or renovating opened the valves, can lead to stem bending, switch is difficult. ( 5) Stem connection, will cover part of the packing and gland, stem nut, in turn, cover on the valve stem screwing, sealing gasket visible change situation, prevent the leakage after sealing surface putting-in-service proactively. After the cover in place, on the body screw holes, tighten bolts symmetry. Again as needed to supplement part of stuffing box packing, the packing gland appropriate pressure. Finally will cover on the handwheel stem nut, lock nut, repair work is over. This method does not need to cut out of the system, online repair. 2 ~ 3 person operation, 1 at repair. 5 h can be completed. Mainly for the money spent to tear open outfit, welding, bonding or drilling construction and materials, general 200 ~ 1000 yuan. After repair the valve switch to normal. 3. Instances of the catalytic device steady steam cooler ( 304/1 of the cold. 2) Cooling water inlet valve ( DN150) And fractionating tower cooler ( 202/1 of the cold. 2) Cooling water inlet valve ( DN200) After the construction of the plant was found that the valve core loss, within a very short time, using the above method to repair two valve, avoid the loss. Only twice in this application, which has been directly reduce the loss of 30000 yuan, the indirect loss of 180000 yuan. These valves use up to now, running in good condition, still in the normal switch, certify that the above repair method is feasible.
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