Operation and maintenance of American standard gate valve

As an American standard valve, in fact, the current gate valve is considered to have a relatively good interception effect. In many cases, when the flow rate of some pipes is relatively fast, this device is required to intercept the medium to slow down the excessive flow of the medium. The scouring and abrasion of the pipe caused by it. And this kind of American standard gate valve also needs maintenance after operation, here is the maintenance method of the gate valve.
　　① It is recommended that the valve with an opening and closing torque greater than 400N m should be designed with a force-increasing mechanism, such as gear mechanism, impact handwheel, valve stem nut with bearing, etc. A 30% to 50% torque margin should be reserved for the selection of Denso. Pneumatic wedge gate valves are not recommended.
　　②The pre-tightening bolts should be tightened after the valve with self-tightening seal design runs for a period of time to prevent the bonnet from sinking when the pressure fluctuates and causing the medium to leak out and rush out of the self-sealing ring. During operation, the packing compression bolts and middle flange compression bolts should be maintained normally and tightened in time. Lubricate the bearing mechanism and various threads regularly to remove dust and dirt in time. Regular action test (important valves should be opened and closed frequently to test their action performance to prevent corrosion and jamming, and find hidden dangers in time), regular maintenance (important valves should be regularly overhauled, and their sealing surfaces, driving mechanisms, sealing rings and other important key parts should be checked and maintained) , Establish equipment maintenance record files.