Valve on the matters needing attention

Before production and after production before welding professional maintenance of valve, the valve is in the service of production operations plays a vital role, orderly and effective maintenance will protect right valve, valve to function properly, and prolong the service life of the valve. The valve maintenance looks be like simple, actually otherwise. Work often have neglected aspect.
1. Valve greasing, note the amount of fat often ignore. Note grease gun after lubrication, the operating personnel selection valves and greasing connection, on the operations. There are two kinds of circumstances: on the one hand, on the quantity is little greasing, sealing surface due to the lack of lubricant and speed up the wear and tear. On the other hand on the excessive, resulting in waste. Is no categories depending on the type of valve, valve sealing capacity of different calculations. Can work out seal to the valve size and class capacity, then the reasonable injection amount of grease.
　2. Often ignore the pressure valve on the problem. In the greasing operation, on the pressure changes regularly with peak valley. Pressure is too low, seal leakage or failure, the pressure is too high, greasing the jams, seal inside lipid hardening or sealing ring and valve ball, valve plate lock. Usually fat injection pressure too low, inject more grease into the valve at the bottom of the cavity. And fat injection pressure is too high, on the one hand, to check on the mouth, so fat pore blocking determine to change the situation; Is lipid hardening on the other hand, to use cleaning fluids, repeated failure sealing grease of softening, and inject new replacement grease. In addition, sealing type and sealing material, also influence on the pressure, different seal forms have different fat injection pressure, usually hard seal fat injection pressure is higher than the soft seal.
　3. Valve greasing, attention to the problem of valve in the switch position. Generally ball valve maintenance in an open state, under special circumstances to choose shut down maintenance. Other valves are not all in open position. Gate valves must be closed during maintenance, to ensure the sealing ring is full of grease seal grooves, if open, sealing grease directly off the inflow, or valve cavity, wasteful.
　4. Valve greasing, often ignore the fat injection 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, check the lubrication effect, confirm the valve ball or disc surface lubrication even.
　5. Greasing, must pay attention to the body bleed and plug pressure problem. Valve down after test, seal chamber cavity gas and water due to environment temperature and pressure, drainage pressure greasing before, to help on the work smoothly. Greasing the air and water are fully replace seal cavity. Drain off the valve cavity pressure in time, also guaranteed the valve use security. On the end, be sure to tighten the drainage and blowdown plug, in case of an accident.
　6. Greasing, attention should be paid to the grease evenly. Normal greasing, close on the mouth of the fat Kong Xian out the fat, and then to low, is high, after successive fat. If not according to the law or not fat, exist jams, QingTong processing in a timely manner.
　7. Note fat will observe the valve size and seal flush problem. The ball valve, for example, if there is an interference, can be adjusted to the open a 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 is lax. By the same token, the adjustment locked in place, also want to consider to open a corresponding adjustment. Ensure quarter-turn valves.
8. Note after fat, must be sealed on the mouth. Avoid impurities to enter, or on the mouth of lipid oxidation, block to daub antirust grease, prevent rust. In order to the next operation is applied.
　9. Greasing, also want to consider specific treatment in oil transportation in the future. In view of the different quality diesel and gasoline, gasoline of scour and decomposition capacity should be taken into account. In gas valve operation, after period of operation, timely add grease, prevent wear and tear.
　10. The tenth, greasing, don't ignore the stem part of greasing. Valve shaft parts with sliding sleeve or packing, also need to keep the lubrication state, to reduce the operation of the friction resistance, such as can not ensure that lubrication, enlarging the worn parts, electric operation torque, when the manual switch.
　11. Some ball valve with arrow on valve body, if there is no attached English FIOW handwriting, seal seat direction, not to the flow direction of medium as a reference, since the drain valve in the opposite direction. Typically, two-seater sealing ball valves with two-way flow.
　12. Valve maintenance, also pay attention to the water problems in electric head and its transmission mechanism. Especially in the rainy season infiltration of rainwater. It is rust the actuator or the shaft sleeve, the second is the winter freeze. Damaged electric valve operating torque is too big, when driving part can make the motor no-load jumped or super torque protection cannot be achieved electric operation. Driving part is damaged, manual operation can't. After the super torque protection operation, manual operation is also unable to switch, such as forced operation, will damage the internal metal parts.
the place on put together is narrated, the valve maintenance truly with scientific attitude, to make the valve maintenance work to achieve the purpose of the effect and application.