Correct installation of valve disc root 6 bending valve maintenance and maintenance

Correct installation of valve disc root 6 bending valve maintenance and maintenance

The EFFECTIVE SEALING OF THE PUMP AND VALVE DEPENDS ON THE OVERALL CONDITION OF THE INDIVIDUAL COMPONENTS, AND ENSURE that the equipment requiring replacement of the disc root has been effectively isolated in accordance with the site and system. Proper installation of disc root is also key to ensure sealing effect. Install the pan root. Carefully INSTALL THE ROOT RINGS ONE AT A TIME, WRAPPING EACH RING AROUND THE SHAFT OR STEM, ENSURING THAT THE ** RINGS ARE FULLY IN PLACE IN THE STUFFING BOX BEFORE INSTALLING THE NEXT RING, STAGGERED AT LEAST 90 DEGREES APART, 120 DEGREES GENERALLY REQUIRED.
The EFFECTIVE SEALING OF THE PUMP AND VALVE DEPENDS ON THE OVERALL CONDITION OF THE INDIVIDUAL COMPONENTS, AND ENSURE that the equipment requiring replacement of the disc root has been effectively isolated in accordance with the site and system. Proper installation of disc root is also key to ensure sealing effect.
1, choose the root. Ensure that the selected root should meet the operating conditions required by the system and equipment; According to the measurement records, calculate the cross-sectional area of the root and the number of root rings required; Inspect the roots to make sure there are no defects; Before installation, ensure that the equipment and roots are clean.
2. The disk root installation tool needs to be used with the disk root ** tool, and the clamping nut is pre-tightened with the fastening device. In addition, regular use of standard safety facilities and compliance with relevant safety regulations are required. Before installing the disc root, familiarize yourself with the following equipment: cutting machine for checking the disc root ring, checking torque wrench or wrench, safety hat, inner and outer calipers, lubricant for fastening device, reflector, disc root removal tool, disc root cutting tool, vernier calipers, etc.
3. Cleaning and inspection. Slowly loosen the gland nut of the stuffing box, release all residual pressure in the pan root assembly, remove any old pan root, and thoroughly clean the shaft/rod stuffing box; Check shaft/rod for corrosion, dents, scratches or excessive wear; Check whether other parts have burrs, cracks, wear, they will reduce the life of the root; Check whether the stuffing box has too large clearance, and shaft/rod eccentricity; Replace the parts with larger defects; Examine the old root as the basis for failure analysis to find the cause of early failure of the root.
4. Measurement and recording. Record shaft/rod diameter, stuffing box aperture and depth, and record the distance from bottom to top of stuffing box when the ring is sealed with water.
5, the preparation of the root ring. Braid the roots by winding the roots on a shaft of appropriate size, or using a calibrated root ring cutter; Cleanly CUT DISC ROOTS INTO BUTT (SQUARE) OR MITER (30-45 DEGREES) AS REQUIRED, ONE RING AT a TIME, AND CHECK FOR SIZE WITH SHAFT OR STEM. Mold ROOT TO ENSURE RING SIZE IS ACCURATE TO SHAFT OR STEM, CUT PACKING RING IF NECESSARY ACCORDING TO ROOT MANUFACTURER’S INSTRUCTIONS OR REQUIREMENTS.
6. Install the pan root. Carefully INSTALL THE ROOT RINGS ONE AT A TIME, WRAPPING EACH RING AROUND THE SHAFT OR STEM, ENSURING THAT THE RINGS ARE FULLY IN PLACE IN THE STUFFING BOX BEFORE INSTALLING THE NEXT RING, STAGGERED AT LEAST 90 DEGREES APART, 120 DEGREES GENERALLY REQUIRED. After the last ring is installed, tighten the nut by hand and press down evenly on the gland. If there is a water seal ring, check that the distance between the plate root and the top of the stuffing box is correct. Also ensure that the shaft or stem can rotate freely.
Valve maintenance and maintenance before welding, before and after the production of professional maintenance of the valve, for the valve service in production and operation plays a vital role, correct and orderly and effective maintenance will protect the valve, the valve function and prolong the service life of the valve. Valve maintenance may seem simple, but it is not. There are often overlooked aspects of work.
Valve grease, often overlooked the amount of grease. After grease filling, the operator selects the connection between valve and grease filling, and then carries out grease filling. There are two situations: on the one hand, the amount of grease is less than enough, and the sealing surface is worn faster because of the lack of lubricant. On the other hand, excessive fat injection causes waste. There is no accurate calculation of the valve seal capacity according to the valve type class. You can calculate the sealing capacity by valve size and category, and then inject a reasonable amount of grease.
Second, valve grease, often ignore the problem of pressure. During the operation of lipid injection, the lipid injection pressure has a regular peak-valley change. The pressure is too low, the seal leaks or fails, the pressure is too high, the grease injection port is blocked, the grease in the seal is hardened or the seal ring is locked with the valve ball and the valve plate. Usually, when the grease injection pressure is too low, the injected grease flows into the bottom of the valve chamber, generally occurring in small gate valves. While the grease injection pressure is too high, on the one hand, check the grease nozzle, if the grease hole is blocked, replace it; On the other hand, lipid hardening, cleaning fluid should be used to repeatedly soften the failed seal grease, and inject new grease replacement. In addition, seal type and seal material, also affect the injection pressure, different seal forms have different injection pressure, in general, the hard seal injection pressure is higher than the soft seal.
Third, when the valve grease, pay attention to the valve in the switch position. Ball valve maintenance is generally in the open state, special circumstances choose to close maintenance. Other valves should not be in the open position. The gate valve must be closed during maintenance to ensure that the grease is filled with the sealing groove along the sealing ring. In the open position, the seal grease is directly into the flow channel or valve chamber, resulting in waste.
Fourth, when the valve grease, often ignore the effect of grease. The pressure, amount of grease and switch position were normal during the operation. However, in order to ensure the grease effect of the valve, sometimes it is necessary to open or close the valve, check the lubrication effect, and make sure that the valve ball or gate surface lubrication is even.
Fifth, grease, pay attention to the valve body drainage and wire blocking pressure relief. After the valve pressure test, the gas and moisture in the valve chamber of the sealing chamber are boosted due to the rise of the ambient temperature, and the drainage and pressure relief should be carried out first when the grease is injected, so as to facilitate the smooth progress of the grease injection work. After grease injection, the air and moisture in the sealing chamber are fully displaced. Timely release the pressure of the valve chamber, but also to ensure the safety of the valve. After the grease injection, it is necessary to tighten the drain and pressure relief wire plug to prevent accidents.
Sixth, when fat injection, we should pay attention to the problem of uniform fat. In normal grease injection, the grease hole closest to the grease injection mouth is the first fat, and then to the low point, is the high point, successively out of the fat. If not according to the law or not out of the fat, it is proved that there is blockage, timely clearance treatment.
Seventh, grease should also be observed when the valve diameter and sealing ring seat flush problem. For example, ball valve, if there is open position interference, you can adjust the open position limiter inward, make sure the diameter is straight and then lock. Adjust the limit not only the pursuit of open or close party position, to consider the whole. If the opening position is flat and not in place, the valve will not be tightly closed. Similarly, when adjusting the closing position, we should also consider the corresponding adjustment of the opening position. Ensure right Angle stroke of valve.
Eighth, grease injection, must be sealed grease injection mouth. Avoid impurities entering, or lipid oxidation at the grease mouth, and the cover should be coated with antirust grease to avoid rust. For the next operation.
Ninth, when fat injection, we should also consider the specific problems in the order of oil transportation in the future. In view of the different qualities of diesel and gasoline, the scouring and decomposition capacity of gasoline should be considered. In the future valve operation, when encountering gasoline section operation, timely supplement grease to prevent wear.
Tenth, grease, do not ignore the stem part of the grease. There is a sliding sleeve or packing in the valve shaft, which also needs to be kept lubricated to reduce the friction resistance during operation. If lubrication cannot be ensured, the torque will increase the wear part during electric operation, and the switch will be laborious during manual operation.
Some BALL VALVES ARE MARKED WITH ARROWS ON THE BODY, IF NOT ACCOMPANIED BY English FIOW HANDWRITING, it IS THE direction OF THE sealing seat, not as a reference for the medium flow direction, the valve self-leakage direction is opposite. Typically, double-seater sealed ball valves have bidirectional flow.
Twelfth, the valve maintenance, also should pay attention to the electric head and its transmission mechanism in the water problem. Rainwater that seeps in especially during the rainy season. One is to make the transmission mechanism or transmission shaft sleeve rust, the other is freezing in winter. Cause the electric valve operation torque is too large, damage to the transmission parts will make the motor no-load or super torque protection jump away to achieve electric operation. Transmission parts are damaged and manual operation is impossible. Manual operation also cannot be switched on and off after the overtorque protection action. If forced operation, the internal alloy components will be damaged.
To sum up, valve maintenance is a science, its results can not be seen or touched. Truly with a scientific attitude, in order to make the valve maintenance work to achieve the due effect and the purpose of application.