Jacking

Hydraulic jacks depend on force generated by pressure. Essentially, if two cylinders (a large and a small one) are connected and force is applied to one cylinder, equal pressure is generated in both cylinders. However, because one cylinder has a larger area, the force the larger cylinder produces will be higher, although the pressure in the two cylinders will remain the same. Hydraulic jacks depend on this basic principle to lift heavy loads: they use pump plungers to move oil through two cylinders. The plunger is first drawn back, which opens the suction valve ball within and draws oil into the pump chamber. As the plunger is pushed forward, the oil moves through an external discharge check valve into the cylinder chamber, and the suction valve closes, which results in pressure building within the cylinder.

PHL Hydraulics UK has established itself as a leading supplier of hydraulic jacking equipment and services undertaking sub-contracts in bridge/structural jacking, flat jacks, propping and sliding. Our service covers equipment supply, testing/calibration, method statements and temporary works.

• Jacks – lockring, high tonnage, hollow, low height.
• Pumps – synchronised lift pumps
• Pile testing jacks to 1100T
• Hollow jacks to 500T
• Bridge Jacking