Pneumatic valve packing installation method

the installation of the pneumatic valve packing installation

the fillers should according to the form of the stuffing box and filler selection of medium pressure, temperature, corrosion resistance to choose. Braided packing tightness should be consistent, the surface smooth and clean, no wound jumper wire filler, defects such as peeling off and metamorphism. Braided packing Angle should be consistent, or, size requirements, no incision have loose thread ends, his mouth, mouth, graphite packing surface should be smooth level off, can not have burrs, pine cracks, scratches and other defects.
packing device need to clean and repair. Remaining within the gland packing shall be thoroughly cleaned up, there is no serious corrosion and mechanical damage. Gland, pressure should be the surface bright and clean, can not have burrs, set of defects such as cracks and severe corrosion. Check the pneumatic valve stem and valve stem, gland, the fitting clearance between and among stuffing box, pneumatic valve stem and gland axis with stuffing box, the gap between, as a general rule, be O. ～O. mm。 Packing installation requirements are as follows:
( Before installation, no of asbestos packing should be coated with a layer of graphite flake graphite powder. Packing bags or boxes, clean. ( Who can in pneumatic valve stem top set of pneumatic valve packing, should try to adopt the method of directly set into the. Set of people before unloading scaffold, hand wheel, lever and other gear, with higher than the pneumatic valve stem pipe as pressure, pressure filler. Will not be used to directly into the set of, packing should be cut into lap form, this form of o-rings to avoid, for chevron packing to ban, can be used for flexible graphite packing. Figure - For the lap packing installation method. Accurate method should be set up and down mouth stagger, sideways packing set in the pneumatic valve stem, and then recover from top to bottom, make the incision anastomosis, gently into the stuffing box.
( To the stuffing box packing, should be good for the first circle, then round with uniform pressure with tight, shall not use many laps around the way, as shown in figure - Shown below. Accurate method is to put the packing of each circle incision ° staggered l lap position, this is one of the most commonly used method, but also the lap position wrong °, or ° and ° staggered used method. Packing during the installation process apart ~ ring should be pneumatic valve rod, a rotating lest pneumatic valve stem and packing killed.
( Stuffing box after filling, basically use compressed by gland packing. When using the gland, the strength should be uniform, both sides to tighten bolts symmetry, shall not put the gland tilt, in order to avoid packing force not divide evenly, and pneumatic valve rod friction. Gland of the depth of the stuffing box pressure set of people for its high l / ~ /, also can use packing ring height as the depth of the gland packing pressure people, generally should not be less than mm preloaded gap, then check that the pneumatic valve rod, the clearance of gland packing box, at four o 'clock should be consistent. Rotary pneumatic valve stem, pneumatic valve stem should be flexible operation, normal force, no jam phenomenon as well. If the force is bigger, should be appropriate to relax a bit gland, reduce packing hold force of pneumatic valve stem.

packing gland set manufacturers recommendation: yongjia county dense machinery accessories co. , LTD. _ _ _ nut packing gland on the seal seat set of producers