Vxabs pump accumulator

What is an ABS accumulator?

ABS accumulators store and hold hydraulic pressure for the system hold-release-reapply cycle. They are used on both integral and non-integral ABS systems. An integral unit includes an electric pump that provides high-pressure power assistance and pressure for the hold-release-reapply cycle.

How do accumulators work?

The dump valve (which is a high-ratio, pilot-to-close check valve) is held closed by pump idle pressure until the pump shuts down. To maintain pressure: Another common application for accumulators is to maintain pressure in a circuit while the pump is unloaded. This is especially useful when using fixed-volume pumps on long holding cycles.

What is a high pressure ABS accumulator?

The parameters vary, usually between 1000 psi and 1600 psi. The control module will illuminate the amber ABS light when pressures get too low. Some high-pressure accumulators reach pressures as high as 2700 psi. Most of today's vehicles use non-integral units. These units contain a low-pressure spring-loaded accumulator.

Does a piston pump have a pulsating accumulator?

Many pumps deliver this power in a pulsating flow. The piston pump, commonly used for its high pressure capability, can produce pulsations detrimental to a high-pressure system. An accumulator properly located in the system will substantially cushion these pressure variations.

How do accumulator pumps work?

Now, stored energy in the accumulator is ported to tank through the orifice. This circuit is very reliable because it depends on system or pump pressure to close and/or open valves. A fixed-volume pump must be ported to tank at very low pressure when its flow is not doing work.

How does a hydraulic accumulator work?

The accumulator stores pressure for the system. They utilize a nitrogen gas charge separated from the pressurized hydraulic fluid by a thick rubber diaphragm. When filled with pressurized fluid from the pump, these accumulators can reach dangerous pressures and must be handled carefully.