Based on the merits, experiences of production and quality control of domestic and international post-tensioning systems using strands, OVM company succeeds in developing OVM Post-tensioning Systems. It passed expert qualification in 1990, was classified as the key trial production of new products project by the State Council Production Office of China in 1991, and obtained national practical new-type patentseses(patent No. is ZL90208622.7), was classified the popularizing project as the scientific and technical result by Ministry of Construction.

After using successfully and studying continuously for more than ten years, OVM Post-tensioning Systems have become one of the most successful Multistrand Post-Tensioning systems nowadays. For its remarkable performance, OVM Post-tensioning Systems have already extensively applied in all kinds of domestic and international fields, such as bridges, prestressing concrete, steel construction, expressway construction, skyscrapers, mines, rock & soil anchor, slope manage, water and electricity nuclear power construction,etc.

OVM Post-tensioning Systems is steady to occupy China and area of Southeast Asia primary importance, and its annual output has arrived 5,000,000 holes.

The anchor coefficient of OVM Post-tensioning Systems is high, its anchoring performance is very steady, reliable. It has a full range of tendon sizes, generally, a set of anchorage can anchor 1～55 strands, the largest number has reached 109 strands already. It can anchor Φ12.7、Φ12.9、Φ15.2、Φ15.7、Φ17.8、Φ21.8、Φ28.6 strands.

Relevant patents of OVM Post-tensioning Systems

Patent No.	Patent Name
ZL90208622.7	Prestressing anchor using strands and wires
ZL97224320.8	Working wedge of anchorage
ZL97244491.2	Working wedge of anchorage
ZL97244362.2	Bearing plate of slab anchorage
ZL98209919.3	Stressing device of prestressing-changing angle
ZL98217098.X	Bearing plate of slab anchorage
ZL99201864.1	The buried in advance type anchorage
ZL99201863.3	pretensioning couplers
ZL98209920.7	Corrosion protection device of anchor head using unbonded tendons