China Feed Through Jack for Prestressing

YDC series prestressing jacks are the new designed products in our company, are the upgrades of the primary jacks.
Features:
1. Using the new seals, to synchronous strengthen the seal-ability under great pressure.
2. Using special alloy steel with heat treatment process, reducing the cylinder's expansion ratio in the tensioning process, so that the life of seals and sealing performance can be improved about 20%;
3. In the tensioning the operating process, jacks is easily damaged under overpressure because of the jack-based pullback cylinder, so we added the overpressure valve on the jacks to pressure production. Meanwhile we improved the original of commonly used structure by wire disc and flanged disc, to make the bearing capacity for oil pressure strengthen, so that enormously reduce the possibility of mechanical damage due to improper operation.
In the word, the YDC series feed-through jacks' performance is improved, and widely used in pre-stressing and post-stressing construction.
Notice: According to users' requirement, YDC through jack can be configured preventing turn device which can prevent jack from rotating in the process of stressing.
Choosing the specification of prestressing jacks should consider the following tips:
1, The stressing of jack should meet the construction requirement, however, consider the impedance loss that produce after filling seal ring and bracing impedance loss between jack and piston, the jack force is about 95% of rated value. If jack need conduct strictly and continuous, the shipping ton of jack should higher than load tonnage, and is calculated per 80% of rated value.
2, The diameter of center hole is bigger above 17mm than the diameter of Max. Cone hole concentric circle of working anchor.
3, For convenient of lectotype, we calculate and make the specification table of lectotype according to the tendon with standard strength of 1860Mpa and diameter of 15.24mm, and the control force of 0.85Fptk.
ModelWeightRated TensionStrokeRated oil pressureTension cylinder areaCenter hole dia.SizeReturn cylinder areaMinimum work spaceObligate lengthkgKNmmMPamm2mmmm mmmmmmYDC65065650200481374475200x 35578341300x 120600YDC1100801100200592356684240x 350137441300x 130600YDC15001101500200473204494270x 373161001300x 150650YDC200013020002005635796110296x 375176621300x 170650YDC250018025002005248381128340x 387280391400x 180650YDC300022030002005554950155380x 387313211450x 220700YDC350025035002005267824165415x 390346181500x 240700YDC400032040002004981954175445x 390427041500x 240700YDC500040050002005296948200495x 390580901600x 270750YDC6500550650020050131900250590x 550751621600x 320750YDC90001150900020054165790275670x 5001102701650x 350800YDC1200016501200020054231299280790x 5001153751800x 410800