Apply to 'have to control emissions requirements' pneumatic valve packing - Garlock9000EVSP

s of the 20th century, moulded Graph - 锁® Graphite ring and end ring suit braided packing structure appeared in the field of pneumatic valve sealing edge. This suit filler on the performance and service life are various packing group is much better than the original design.
but people soon realized that this suit packing has an obvious shortcoming in the marketing process is blocked and not widely accepted. Traditional weaving ring can have a greater amount of radial expansion, and suit packing no. Traditional braided rings are more likely to be compressed and exhibition, that comes to fill/' 。 Mm even larger gap. Square cross section Graph - and generally recognized by the industry mostly 锁® Graphite ring radial expansion amount is about. 'To. ” ( 。 Mm. mm。 The limitations of this expansion amount makes maintenance personnel must be very accurate measurement of pneumatic valve size, do a lot of records, to develop precise size of the graphite ring, which greatly increased the workload.
therefore, Garlock started packing set research and development to overcome the limitation of this project. Thus obtained EVSP concept. Flat ring packing group, which is different from traditional EVSP radial expansion capacity can reach/' ( 。 mm。 This greatly reduces the need necessary for accurate measurement of pneumatic valve size, so as to make the EVSP widely accepted, and even can be used to seal pneumatic valve stem and gland has been affected by partial wear of pneumatic valve. Such excellent expansion as well as the packing group won a resounding name - EVSP: Expandable ( Expandable Valve ( Pneumatic valve Stem ( Pneumatic valve stem Packing ( Packing.
EVSP radial expansion characteristics make its seal performance compared with the traditional flat ring packing is greatly increased. The sealing performance make EVSP widely praised by the industry. Once had a Japanese pneumatic valve factory done research, applying the same axial pressure, gland EVSP radial expansion displacement is a traditional flat ring twice.
EVSP design includes a ring - two knitting end ring plus five Graph - in the middle 锁® 'Cup cone' graphite ring. Two knitting end ring support among the five graphite ring, a graphite extruder, wipe the pneumatic valve stem and increases the springback. Among the five rings, two for the concave and convex adapter ring, three is the exercise of sealing function of seal ring in the middle. Two adapter ring is moulded into ° Angle of high density ring. Three Graph - in the middle 锁® Sealing ring is moulded into a low density ring ° Angle. It is this ingenious structure - a different Angle and density - makes EVSP has remarkable radial expansion and sealing performance. As shown in figure, the adapter ring with the top sealing ring hold pneumatic valve stem. The adapter ring tiejin stuffing box wall to combine with the bottom of the sealing ring. When the compressed packing group, different Angle and density of graphite ring axial load will force more effectively into radial expansion.