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Customers need to purchase a double-action, high-tonnage hydraulic jack for the overhaul of the gantry crane. According to the investigation the customer requires a 500-ton hydraulic jack, as the gantry crane is quite heavy. To prevent sudden loss of control of the cylinder during descent in the of a power outage or other emergencies, and to avoid unnecessary property loss, BOLTING engineers made a selection based on the construction situation. The solenoid valve uses a pilot-operated solenoid valve with a double-acting hydraulic lock. The working principle and characteristics of the pilot-operated solenoid valve.

Principle: When powered on, the electromagnetic force opens the pilot hole, the pressure in the upper chamber quickly drops, and a pressure difference with high pressure at the bottom and low pressure at the top is formed around the shut-off member, the fluid pressure pushes the shut-off member to move upward, and the valve opens; when powered off, the spring force closes the pilot hole, and the inlet pressure quickly forms a pressure difference with low pressure at the bottom and high pressure at the top around the shut-off member through the bypass hole, the fluid pressure pushes the shut-off member to move downward, closing the valve.　

Features: low power consumption, 0.1-0.2w, can be frequently powered on, and will not burn out even if powered on a long time. Moreover, it is energy-saving, with a high upper limit of the fluid pressure range, can be installed arbitrarily (to be customized) but must meet the pressure difference conditions. The advantage is that it generates less heat, saves energy, but more importantly, because of the low heat generation, the coil is not easy to burn out, can be powered on for a long time, which is particularly valued.