Storage, Usage and Maintenance of Valves

Operation and Maintenance

◆ The purpose of storage and maintenance is not to damage the valve in storage or reduce the quality. In fact, improper storage is one of the important reasons for valve damage.

◆ Valve storage, should be well organized, leave small valves on the shelf and large valves can be neatly arranged on the warehouse floor, disordered stacke is not permitted, flange connection surface should not contact the ground for the purposes of keep clean and protect the valve from damage.

◆  Avoid the unnecessary losses caused by improper storage and handling like handwheel breaking, valve stem skew, handwheel and valve stem fixing nut loose loss, etc.

◆ For valves that are not used in the short term, asbestos packing should be removed to avoid electrochemical corrosion and damage to the valve stem.

◆ The valve that has just entered the warehouse should be checked, such as rain or dirt in the transportation process, it should be wiped clean and then stored.

◆ Valve inlet and outlet should be sealed with wax paper or plastic sheet to prevent dirty things in.

◆ The valve processing surface that can rust in the atmosphere, it should be coated with anti-rust oil to protect it.

◆ Outdoor valves must be covered with rainproof and dustproof items such as linoleum or tarpaulin. The warehouse where the valves are stored should be kept clean and dry.

◆ The purpose of use and maintenance is to extend the life of the valve and ensure reliable opening and closing.

◆ Valve stem thread, often rub with valve stem nut, to apply a little yellow dry oil, molybdenum disulfide or graphite powder, play a lubricating role.

◆ Valves that are not often opened and closed should also be rotated regularly to add lubricant to the valve stem threads to prevent biting.

◆ Outdoor valve, the valve stem should be added protective cover to prevent rain, snow, dust and rust.

◆ If the valve is mechanical, add lubricating oil to the gearbox on time.

◆ Always keep the valve clean.

◆ Always check and maintain the integrity of the other parts of the valve. If the fixing nut of the handwheel falls off, it should be matched and cannot be used together, otherwise it will wear the square of the upper part of the valve stem, gradually lose the reliability of the match, and even cannot be started.

◆ Do not rely on the valve to support other heavy objects, do not stand on the valve.

◆ The valve stem, especially the thread part, should be wiped frequently, and the lubricant that has been dirty by dust should be replaced with a new one, because the dust contains hard debris, which is easy to wear the thread and the valve stem surface, affecting the service life of the filler maintenance.

◆ Packing is directly related to the key sealing parts of whether leakage occurs when the valve is switched on and off. If the packing fails, resulting in leakage, the valve is equal to failure, especially the valve of the urea pipeline, because of its relatively high temperature corrosion is relatively bad, the packing is easy to age. Enhanced maintenance can extend the life of the filler.

◆ When the valve leaves the factory, in order to ensure the elasticity of the packing, it is generally subject to static pressure test without leakage. After the valve is loaded into the pipeline, due to temperature and other factors, there may be leakage, then it is necessary to tighten the nut on both sides of the packing gland in time, as long as it is not leaked, and then if there is leakage again, do not tighten once, so as not to lose the elasticity of the packing and lose the sealing performance.

◆ Some valve packing is equipped with molybdenum disulfide lubricant, after usage of a few months, it should be added in time to the corresponding lubricating grease, when found that the filler needs to be added, it should be added in time to ensure the sealing performance of the transmission parts maintenance.

◆ In the process of valve switching, the original lubricating oil will continue to be lost, coupled with the effect of temperature, corrosion and other factors, making the lubricating oil continue to dry up. Therefore, the transmission part of the valve should be checked frequently, and the lack of oil should be filled in time to prevent increased wear due to the lack of lubricant, resulting in inflexible transmission or failure of the case.