How to operate and maintain the valve during operation, and what regulations should the operation and maintenance of the valve comply with
Many hydraulic engineers are skilled in the daily maintenance of the valve in the process of working, and there are almost no mistakes, but they often ignore the possible problems of the valve in the operation process. How to operate and maintain the valve in the operation process? What regulations should the operation and maintenance of valves comply with? Like valve answers them one by one!
1、 How to operate and maintain the valve during operation
① Keep the exterior and moving parts of the valve clean and protect the integrity of the valve paint. The trapezoidal thread, stem nut, support sliding parts, gear, worm and other parts on the valve surface, stem and stem nut are easy to deposit a large amount of dust, oil stain, medium residue and other dirt, causing wear and corrosion to the valve.
Therefore, keep the valve clean at all times. The general dust on the valve is suitable for brush cleaning and compressed air cleaning, even with copper wire brush until the machined surface shows metallic luster, and the paint surface shows the real color of the paint.
The steam trap shall be in the charge of a specially assigned person and inspected at least once per shift; Open the flushing valve and steam trap regularly, or disassemble and flush regularly to avoid dirt blocking the valve.
② Keep valve lubrication, valve ladder thread, valve stem nut and support sliding parts, bearing position, gear and worm meshing parts and other matching moving parts. Good lubrication conditions are required to reduce mutual friction and avoid mutual wear. For parts without oil cup or nozzle that are easy to be damaged or lost during operation, all lubrication systems shall be repaired to ensure the dredging of oil circuit.
The lubrication part shall be filled regularly according to the specific situation. If it is often opened, the high temperature valve is suitable for refueling once a week to a month; If it is not opened frequently, the refueling cycle of the low-temperature valve can be longer. Lubricants include oil, butter, molybdenum disulfide and graphite. Engine oil is not suitable for high temperature valves; Butter is not suitable either. It will be lost due to melting at high temperature. The high temperature valve is suitable for adding molybdenum disulfide and wiping graphite powder.
If the exposed lubricating parts, such as trapezoidal threads, between teeth, etc., are used with grease, they are easy to be polluted by dust. If molybdenum disulfide and graphite powder are used for lubrication, it is not easy to be polluted by dust, and the lubrication effect is better than butter. Graphite powder is not easy to apply directly. It can be mixed into a paste with a little oil or water.
The plug valve shall be filled with oil at the specified time, otherwise it is easy to wear and leak.
③ Keep both pieces intact. The bolts of flange and support shall be intact and shall not be loose. If the fastening nut on the hand wheel is loose, it shall be tightened in time to avoid wearing the joint or losing the hand wheel.
The hand wheel shall not be lost and replaced in time. The packing differential pressure shall not be inclined or have no preload clearance. In the environment easily polluted by rain, snow, dust, etc., the valve rod shall be equipped with a protective cover. The ruler on the valve shall be complete and accurate. The lead seal, cover and pneumatic accessories of the valve shall be intact. The insulating jacket shall be free of depression and crack.
In addition, it is not allowed to knock the valve, support heavy objects or stand personnel to avoid fouling the valve and damaging the valve. In particular, non-metallic mesh and cast iron valves are prohibited.
Maintain daily maintenance of electrical equipment. The maintenance of electrical equipment is usually no less than once a month. The maintenance contents include: the appearance shall be clean without dust accumulation, and the equipment shall not be polluted by steam, water and oil; The sealing surface and points shall be firm and tight. No leakage;
The lubricating part shall be filled with oil according to the regulations, and the valve nut shall be filled with grease; The electrical part shall be intact without phase failure, the automatic switch and thermal relay shall not be buckled, and the indicator light shall be displayed correctly.
2、 What regulations should the operation and maintenance of valves comply with
The maintenance and management of valves shall comply with the following provisions:
1. The auxiliary solenoid valve of the rain forest valve shall be inspected every month and shall be subject to start-up test. If the action is abnormal, it shall be replaced in time;
2. The power supply and opening and closing performance of electric valve and solenoid valve shall be tested every month;
3. All control valves on the system shall be fixed in the open or specified state with lead seals or chains. The lead seals and chains shall be inspected once a month. In case of damage or damage, they shall be repaired and replaced in time;
4. The control valve in the outdoor valve well and on the water inlet pipe shall be inspected once a quarter, and it shall be verified that it is fully open;
5. The appearance of water source control valve and alarm valve group shall be inspected every day, and the system shall be in fault-free state;
6. A water discharge test shall be conducted for all the end water test valves and the water discharge test valves of the alarm valve of the system every quarter, and whether the system startup, alarm function and water outlet condition are normal shall be checked;
7. When the municipal water supply valve is fully open, the differential pressure of the backflow preventer shall be tested every month, and shall comply with the relevant provisions of the current national standards: pressure reducing backflow preventer GB / T 25178, low resistance backflow preventer JB / T 11151 and double check valve backflow preventer CJ / T 160.
Post time: Apr-24-2022
