Gate valve plate off after the repair

For Ming rod wedge gate valve, the valve in the opening and closing due to corrosion, wear or improper operation leading to the connection between the stem and the valve failure, the valve spool off every year. After the valve is closed, it can not be opened and can only be replaced after it is cut out of the system. If it can not be cut out of the system, only the other process or device is stopped. 1. Repair method for the spool off and can not be cut out for processing, it can be sealed media has sealed the case, the valve body, the valve core and seat, change the valve cover, stem, copper sleeve, disk After the root and gland are assembled, the valve core is exposed, and then the valve stem and the valve core are restored to connect by a conventional method. In this way, the three valve seals can be continuously ensured and the valve can be reopened. After the valve cover is disassembled, except the special valve, the wedge angle of the valve plug is in the friction angle domain. No matter how the pressure on both ends of the valve plug changes, the valve plug will not squeeze out from the valve seat in the self-locking condition. The valve core is even less out of the situation. 2. Operation steps (1) Take the wedge gate valve as an example. When the valve stem and the valve core fail to be connected, the handwheel can still be rotated, and the valve core can be pushed back to the valve seat by the handwheel to ensure that the valve core and the valve Sealing between the two sealing surfaces, which is a prerequisite for the application of this method of repair. First unscrew the valve packing gland nuts, the packing loose, and then in turn all the nuts on the valve cover loose a few buckle, but temporarily not completely unscrewed. (2) continue to turn the handwheel in the closing direction, then the valve stem will not move anymore, but the whole part of the valve cap is separated from the valve body. The operation of this step is to observe the seal between the valve plug seat and the valve seat sealing surface If the seal is not tight, there is media leakage, as long as the amount is not large, will not affect the construction site in a short time processing, you can completely unscrew the nuts on all bolts, remove the cover above the valve and the valve Rod, the top of the valve seat in the valve seat is exposed to see the original connection between the valve stem and spool, as well as the causes of failure to work out solutions. (3) Gently rotate the stem in the upper part of the bonnet, and then withdraw from the stem nut and stuffing box. At the same time, unscrew the stem nut locknut and remove the handwheel and stem nut. Not limited to free rotation. (4) The removed valve stem and the spool alone reconnected, the general valve stem and the valve are connected to restore the connection using the welding method, this method is well used in the valve spool off the water line, wind and steam Online, even if the valve seat seal is not tight, media leakage, as long as does not affect the construction, can be used. It is very unsafe to directly weld the oil and gas medium valve when it is repaired. The valve stem end can be taken out and processed into the special form required. When the valve stem and the valve core are connected, the contact surface is made of high-strength adhesive Repair treatment, or drilling in the field of the top of the spool tapping, stem connecting the additional processing of matching thread, and then connect. It should be noted that the valve stem and re-connected after installation, the stem and the valve cover mounting plane to be vertical, neutral is better, otherwise repair the valve open, it will lead to valve stem bending, switch difficult. (5) After the valve rod is connected, replace the valve cover, partial packing, gland and stem nut with the valve stem screw in turn, and replace the gasket as the case may be to prevent the sealing surface from leaking after it is put into operation. After the valve cover is in place, align the body screw holes and tighten the bolts symmetrically. If necessary, fill some of the stuffing box filler, the packing gland appropriate compression. Finally, put the stem nut on the hand wheel, tightly tighten the lock nut, repair work is over. This method does not need to cut out the system, online repair. Repair 2 to 3 people to operate, 1.5h can be completed. The main cost for dismantling, welding, bonding or drilling of the construction and materials costs, usually 200 to 1,000 yuan. Valve repair is normal. 3. Example Steaming Unit Steady Steam Cooler (Cold 304 / 1.2) Cooling Water Inlet Valve (DN150) and Fractionator Top Cooler (Cold 202 / 1.2) Cooling Water Inlet Valve Core off, using the above method to repair the two valves within a very short time, to avoid the loss of production. Only two applications, has directly reduced the loss of 30,000 yuan, an indirect recovery of 180,000 yuan loss. These valves have been in operation in good condition and are still normally on and off, demonstrating that the above repair method works.

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