Features of post tensioning jacks:
YDC feed-through jacks are the new designed products in our company, are the upgrades of the primary jacks.
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, multi Strand Jacks is easily damaged under overpressure because of the jack-based pullback clinder, 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 poststressing construction.

Parameters of post tensioning hydraulic jack:

Description of Hydraulic Stressing Jack:

YCW series light jack is a type of common prestressed with jacks, tensioning operation in all kinds of steel strand anchorage. It is widely used in large buildings, structures, prestressed concrete bridges, rock anchorage, hydraulic structure, foundation anchorage and other major projects. The main components of the jack are made of high strength steel, with compact structure, light weight and small volume. The axial length is short, the tension length of the strand is short, and the steel strand material can be saved. And the hoisting is flexible, durable, easy to operate and easy to repair.