The maintenance and management of brass valves include the whole process of delivery, storage, installation and use, which is an important guarantee for the normal operation of brass valves.
1. Maintenance of brass valve during transportation
The hand wheel of brass valve is damaged, the valve stem is bent, the bracket is broken, the flange sealing surface is bumped and damaged, especially the damage of brass water valves, a considerable part of it occurs during the transportation of the brass valve. The reason for the above-mentioned damage is mainly due to the poor understanding of the basic knowledge of brass valves by the transportation personnel and the brutal loading and unloading operations.
Before transporting brass valves, prepare ropes, lifting equipment and transportation tools. Check the brass valve packaging. If the packaging is damaged, it should be repaired and nailed. It should not be afraid of trouble or fluke; the packaging must meet the requirements of the standard, and it is not allowed to rotate the handwheel of the packaged and sealed brass valve; the brass valve should be in full In the closed state, for brass valves that have been opened by mistake, the sealing surface should be wiped clean and then closed tightly to close the inlet and outlet channels. The transmission device should be packaged and transported separately from the brass valve, such as brass ball valves, brass gate valves, angle valves.
When the brass valve is shipped and hoisted, the rope should be tied to the flange or bracket, and never tied to the handwheel or valve stem. The brass valve should be lifted and put gently, don't hit other objects, and place it smoothly. The position should be upright or obliquely, with the valve stem upward. For brass valves that are not securely placed, they should be tied up with ropes or fixed with spacers to avoid collisions during transportation.
When manually loading and unloading brass valves, it is not allowed to throw brass valves down from the car, nor from the ground to the car; the handling process should be orderly, arranged in sequence, and it is strictly forbidden to stack them.
During the transportation of brass valves, take good care of the paint, nameplate and flange sealing surface, and it is not allowed to drag the brass valve on the ground, and it is not allowed to move the sealing surface of the inlet and outlet of the brass valve on the ground.
Brass valves that are not installed on the construction site should not be unpacked. They should be placed in a safe place and protected from rain and dust.
2. Maintenance of Brass Valves during Storage
After the brass valve is transported into the warehouse, the custodian should go through the storage formalities in time, which is conducive to the inspection and storage of the brass valve. The custodian should carefully check the type and specifications of the brass valve, check the appearance quality of the brass valve, and assist the inspector in the strength test and tightness test of the brass valve before storage. Brass valves that meet the acceptance criteria can go through the storage procedures; the unqualified ones should also be kept properly and waited for the relevant departments to deal with.
For brass valves in storage, carefully wipe and clean the accumulated water and dust during transportation of brass valves; apply a layer of anti-rust agent or Paste a layer of rust-proof paper to protect it; the inlet and outlet channels of the brass valve should be sealed with plastic caps or wax paper to prevent dirt from entering.
The brass valves in inventory should be consistent with their accounts, classified into categories, neatly placed, clearly labeled, and easy to recognize. Small brass valves should be arranged on the shelf in the order of model specifications and sizes; large brass valves can be arranged on the floor of the warehouse and placed in blocks according to model specifications. Brass valves should be placed upright or obliquely. Do not touch the flange sealing surface to the ground, and do not allow them to be stacked together. For extra-large brass valves and brass valves that cannot be stored temporarily, they should also be placed upright in an outdoor dry and ventilated place according to their category and size; the sealing surface of the brass valve should be protected with oil, and the passage should be sealed; For packing, in order to prevent rainwater from entering the valve, seal the stuffing box opening with grease such as butter, and cover it with linoleum or raincloth. It is best to set up a temporary storage shed to protect it.
In order to keep the brass valve in good condition, in addition to a dry, ventilated, clean and dust-free warehouse, there should also be an advanced and scientific management system; all brass valves in storage should be maintained and inspected regularly. From the date of leaving the factory, the pressure test should be re-inspected after 18 months.
For brass valves that have not been used for a long time, if asbestos packing is used, the asbestos packing should be taken out of the stuffing box to avoid electrochemical corrosion and damage to the valve stem. For brass valves without packing, the manufacturer is generally equipped with spare packing, and the custodian should keep it properly.
The brass valve parts that are damaged or lost during transportation, such as hand wheels, handles, rulers, etc., should be provided in time and must be missing.
Anti-rust agents and lubricants that exceed the prescribed period of use should be replaced or added regularly according to regulations.
3. Maintenance of Brass Valves during Uses
The purpose of maintenance during operation of the brass valve is to ensure that the brass valve is kept clean all year round, with good lubrication, complete valve parts, and normal operation.
1. Cleaning the brass valve
The surface of the brass valve, the trapezoidal thread on the stem and stem nut, the sliding part of the stem nut and the bracket, as well as the gears, worm gears and other parts, are prone to accumulate a lot of dust, oil and medium residues. The valve will wear and corrode. Therefore, it is obviously very important to keep the exterior and moving parts of the brass valve clean and to protect the integrity of the brass valve paint. The dust on the brass valve is suitable for brushing and compressed air blowing; the trapezoidal thread and the dirt between the teeth are suitable for wiping with a rag; the oil and medium residues on the brass valve are suitable for steam blowing, even with copper Brush with wire brush until the processed surface and mating surface show metallic luster, and the painted surface shows the true color of the paint. The trap should be inspected by a dedicated person at least once per shift. The flush valve and the plug at the bottom of the trap should be opened regularly for flushing, or should be disassembled and flushed regularly to prevent dirt from blocking the brass valve.
2. the lubrication of brass valves
Brass valve trapezoidal thread, valve stem nut and sliding parts of the bracket, bearing parts, gear and worm gear, worm engagement parts and other coordinated movable parts, all need good lubrication conditions to reduce mutual friction and avoid mutual wear. Some parts are specially equipped with oil cups or nozzles. If they are damaged or lost during operation, they should be repaired and the oil circuit should be dredged.
Lubrication parts should be regularly refueled according to specific conditions. Frequently opened brass valves with high temperature are suitable for refueling once a week to a month; brass valves with infrequent openings and low temperature may have a longer refueling cycle. Lubricants: organic oil, butter, molybdenum disulfide, graphite, etc. High-temperature brass valves are not suitable for oil and butter, which will be lost due to high temperature melting, and are suitable for injecting molybdenum disulfide and wiping graphite powder. For exposed parts that need to be lubricated, such as trapezoidal threads, gears, etc., if grease such as butter is used, it is easy to be contaminated with dust, while molybdenum disulfide and graphite powder are used for lubrication, which is not easy to contaminate dust, and the lubricating effect is better than butter. Graphite powder is not easy to apply directly, it can be used in paste form with a little oil or water.
The oil-filled plug valve should be filled with oil according to the specified time, otherwise it is easy to wear and leak.
3. the maintenance of brass valves
For brass valves in operation, various valve parts should be complete and intact. The bolts on the flange and the bracket are indispensable, the threads should be intact and no looseness is allowed. The tightening nut on the handwheel should be tightened in time if it is found to be loose to avoid wearing the connection or losing the handwheel and nameplate. If the handwheel is lost, it is not allowed to replace it with an adjustable wrench, and it should be equipped in time. The packing gland is not allowed to be skewed or have no pre-tightening gap. For brass valves in an environment that is susceptible to dirt such as rain, snow, dust, sand, etc., a protective cover should be installed on the valve stem. The ruler on the brass valve should be complete, accurate and clear. The lead seals, caps, and pneumatic accessories of the brass valve should be complete and intact. There should be no dents or cracks in the insulation jacket. It is not allowed to knock, stand or support heavy objects on brass valves in operation; especially non-metallic brass valves and cast iron brass valves, even more so.
4. Maintenance of Idle Brass Valves
Maintenance of idle brass valves should be carried out together with equipment and pipelines, and the following work should be done:
1. Clean the brass valve
The inner cavity of the brass valve should be purged and cleaned, and there should be no residues and water solution. The outside of the brass valve should be wiped clean, and there should be no dirt, oil,
2. Complete valve parts
After the brass valve is missing, it cannot be disassembled to make up for the west. The valve parts should be equipped to create good conditions for the next use and ensure that the brass valve is in the end.
3. Anti-corrosion treatment
Take out the packing in the stuffing box to prevent electrochemical corrosion of the valve stem. The sealing surface of the brass valve, the valve stem, the valve stem nut, and the machined surface should be coated with anti-rust agent and grease as the case may be; the painted areas should be coated Apply anti-rust paint.
4. Protection and protection
Prevent the impact of other objects, manual manipulation and disassembly, if necessary, the movable parts of the brass valve should be fixed, and the brass valve should be packaged and protected.
5. Regular maintenance
Brass valves that have been idle for a long time should be inspected and maintained regularly to prevent corrosion and damage to the brass valves. For brass valves that have been idle for too long, they should be tested together with equipment, devices, and pipelines before they can be used.
5. Summary
Here we come to an end of brass valve maintenance, during transport, storage, uses, hope it will be helpful for your work concerning brass valves.
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