Pneumatic valve and pump with packing the installation and adjustment of the actual operation

pump and pneumatic valve effective seal depends on the parts of the overall situation, to pay special attention to, in the packing before installation, sure need to change the packing equipment has been isolated according to the field and system effectively. The following is used to guide maintenance personnel, engineers, and assembler correctly install and adjust the packing. , need tools when take off the old packing change new packing need to use special tools, as well as with a fastening device preloaded gland nut. In addition, the need to use the standard safety facilities often and comply with the relevant safety regulations.
before installation, the first to be familiar with the following equipment: check the packing ring cutting machine, check the torque spanner or wrench, helmet, calipers, fastening device inside and outside of lubricant, mirrors, packing, packing tool cutting, vernier caliper, etc.
, cleaning and inspection. Slowly loosen packing gland nut, release packing components within all the residual pressure, remove all the old packing, thoroughly clean the shaft/rod stuffing box; Check the shaft/bar for corrosion, dents, scratches or excessive wear; Check if other parts have burrs, cracks, wear, they will reduce the life of the packing; Check the stuffing box for large gap, and the eccentric degree of shaft/rod; Parts replacement have larger defects. : check the old packing, as the basis of failure analysis, in order to find the reason that premature failure of the packing.
, measuring and recording. Record the diameter of the shaft/rod, gland aperture and depth, and the water sealing ring, stuffing box at the bottom to the top of the distance.
, choice of packing. Make sure to choose the packing should meet the requirements of systems and equipment operating conditions; According to the measurement record, calculation of cross-sectional area of packing and the quantity of packing rings required; Inspection packing, ensure its zero defect; Before installation, ensure the equipment and packing clean.
, packing ring. Braided packing on the appropriate size of the shaft winding packing, or the use of calibrated packing ring cutting machine; According to cleanly cutting packing into docking ( Square) Or miter ( - C) , at one time a ring and shaft or pneumatic valve rod inspection size are appropriate.
molding packing, make sure that the size of the ring and the shaft or pneumatic valve rod with precise, when necessary, according to the requirements of the packing manufacturers operating guidelines or cutting packing ring.
packing and installation. Carefully every time you install a packing ring, each ring around the shaft or pneumatic valve stem, before installing the next ring should ensure that the ring have been completely in the stuffing box in place, the next ring should be staggered arrangement, at least degree, general requirements. The most on a ring installed, tighten the nut by hand, gland evenly press. If there is a water seal ring, should check with the stuffing box at the top of the distance is correct. At the same time to ensure the shaft or pneumatic valve stem can free rotation.
and adjust the packing.
） Pump with packing
( ） Continue with the hand tighten gland nut;
（ ） Open pump, adjust gland nut, are allowed at this time a bit more leakage;
（ ） Slowly tighten gland nut, gradually reduce the leakage, leakage until achieve acceptable levels;
（ ） If sudden stop leak, should be back to twist the gland nut, to adjust to prevent packing overheating;
（ ） Adjust the leakage rate reached a stable state.
） Pneumatic valve with packing. Consult packing manufacturer or enterprise's technical department regulations on torque or compression percentage, complete the following steps to tighten gland nut.
（ ） Pressuring gland nut torque to the torque of the % or the compression percentage;
（ ） Repeatedly breath valve open several times, when the pneumatic valve in the closed position, applying full torque;
（ ） Repeat steps ( ） Or time.
, tighten and replace again. In a few hours after operation, and check the regulation of gland condition, when it is necessary to tighten, when gland cannot be further adjustment, must change the packing.