![]() ![]() Load sensing pumps work by taking two pilot signals from either side of a fixed orifice. On a compacting machine where the load increases as the actuator extends, the actuator speed would be very high until the load reached 200 BAR. They will give full flow upto the set pressure and then almost nothing, in terms of useable flow. Pressure compensators have their limitations. Pressure compensators work best where the pump needs to be on standby or idle for a long period of time. ![]() 10 times more than the pump with a compensator. Lets say the pump displacement is 50 litres per minute.Ī fixed displacement gearpump on the same system will consume 16.666Kw when idle. Lets say the system has 10 pilot operated valves with a combined leakage of 4 litres per minute, add the 1 litre for the pump leakage, that gives 5 litres per minute. The power consumption will be small.Ī pump with a dead head leakage value of 1 litre per minute will consume 0.333Kw.Ī system with several pilot operated valves will take more power because the pump is having to supply more oil to maintain the 200 BAR set pressure. On a leak free system, the pump will only need to replace oil lost through the pump casing. This is why its a "pressure compensator".it limits pressure. ![]() When the pump is de-stroked it will only provide enough oil to maintain 200 BAR. The servo piston moves, adjusting the swash angle, reducing the stroke distance of the pistons and therefor the volumetric output. Then the compensator basically connects the system pressure to the servo piston in the pump. With a compensator set a 200 BAR, the system pressure will rise to until the set pressure is reached. A pressure compensator attached to a variable piston pump will limit the pressure of the pump by "de-stroking" the pump at a set pressure. ![]()
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