1. YDC Tension Hollow Hydraulic Jack is suitable for the tension of group anchors with 1860-2000 sizes, Φ15.24, Φ12.7 strands.
2. In some certain circumstance it can be used in the working of pushing, jacking and transforming and so on.
3. Stressing jack is easy to operate and used widely. 

YDC prestressing hydraulic jack is matched with prestressed anchorage widely used in the construction of bridge and buildings, railway and subway, water conservancy and hydropower engineering.

YDC Series of Tension Hollow Hydraulic Jacks are the new designed products in our company, are the upgrades of the primary jacks.
1. Using 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 the life of seals and sealing performance can be improved about 20%.
3. In the tensioning and 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 enormously reduce the possibility of mechanical damage due to improper operation. 
In one word, the YDC Tension Hollow Hydraulic Jack's performance is improved, and widely used in pre-stressing and post stressing construction. 

Shipping pictures of tension hollow hydraulic jack:

Model	Tonnage	Tension  force	Stroke	Central  diameter	Dimension	Weight	Tension  area	Rated oil pressure	Number of  max. Tension strands
	Ton	kN	mm	mm	mm	kgs	mm²	Mpa	strand
QYC250	25	250	200	φ19	φ105×500	20	4415	60	Single strand
QYC100B	10	100	850	φ10	φ1095×777	37	2230	43	Single strand
QYC300	30	300	400	φ19	φ110×700	20	6263	50	Single strand
YDC650	65	650	200	φ60	φ190×345	58	12638	51	3 strands
YDC1100	110	1100	200	φ78	φ230×356	80	24048	54	5 strands
YDC1500	150	1500	200	φ90	φ270×356	120	30242	50	7 strands
YDC2000	200	2000	200	φ114	φ296×372	135	35796	56	9 strands
YDC2500	250	2500	200	φ128	φ348×373	180	48358	52	12 strands
YDC3000	300	3000	200	φ142	φ375×385	250	57796	52	14 strands
YDC3500	350	3500	200	φ158	φ416×385	280	70765	49	17 strands
YDC4000	400	4000	200	φ158	φ424×385	310	76308	53	19 strands
YDC4600	460	4600	200	φ190	φ473×390	400	86072	53	22 strands
YDC5000	500	5000	200	φ193	φ480×395	430	93696	53	24 strands
YDC5600	560	5600	200	φ193	φ510×400	460	107156	52	27 strands
YDC6500	650	6500	200	φ205	φ538×400	500	124580	52	31 strands
Remark	1. There are available jacks in stock if the tonnage is under 650 tons. 2. It needs to be customized if tonnage is over 650 tons. 3. Standard stroke is 200mm; if there are specific requirements, it needs to be customized.