The matters need attention for Gate valve

Attention gate valves in the switch. Gate valve maintenance generally is in open state, when special circumstances choose shut down maintenance. Valve is also mixed with others. Forged steel gate valve must be closed during maintenance, to ensure that the grease along the sealing ring seal groove, if open, sealing grease the inflow, or directly off the valve cavity, resulting in waste.
Valve greasing, often ignore the note fat effect problem. Greasing operation pressure, fat injection rate, switch is normal. But in order to ensure the valve grease injection effect, and sometimes need to open or close the valve, inspect the lubricating effect, confirm the valve ball or disc surface lubrication even.
Gate valves should pay attention to body bleed and plug the pressure problem.Slab gate valve on test, seal chamber cavity gas and moisture due to environment temperature and pressure, on the drainage pressure before, help on the work smoothly. Note after grease in the seal chamber air and moisture was full replacement. Timely discharge valve cavity pressure, also guaranteed the valve use security.
After greasing, be sure to tighten the drain and the drain plug, in case of an accident. Greasing, attention should be paid to the grease evenly. Normal greasing, distance on the mouth recently fat fat Kong Xian, then to low, the last is high, successive fat. If not in accordance with the law or not fat, prove that there is congestion, QingTong processing in a timely manner.
Gate valve to valve size and packing holder level problem. Forged steel gate valve, for example, if there is a interference, can be adjusted to the open position limiter, after confirm size flat lock. Adjust the limit not only the pursuit of open or GuanYiFang position, want to consider as a whole. If a flush and close does not reach the designated position, will cause the valve clearance is lax.
Similarly, adjust the shut in place, also want to consider to open a corresponding adjustment. Ensure API 6A gate valve. Note after fat, must be sealed on the mouth. Avoid impurities to enter, or on the mouth of the lipid oxidation, block to daub antirust grease, prevent rust. Application to the next operation
Gate valves to consider specific treatment in oil transportation in the future. In view of the different quality diesel and gasoline, gas flushing should be considered and the decomposition ability. In gas valve after operation, the period of operation, timely add grease, prevent wear and tear. Greasing, don't ignore the stem part of greasing. Valve shaft part has a sliding shaft sleeve and packing, also need to keep the lubrication state, to reduce the frictional resistance during operation, such as can't ensure that lubrication, the electric operation torque increased wear parts, manual operation switch.
Some china valve marked with arrow on valve body, if there is no attached English FIOW handwriting, seal seat direction, the flow direction of medium is not as reference, since the drainage valve in the opposite direction. Typically, forged steel gate valve with two-way flow.