THM – KA & KAA – Piston Accumulator

Product details

THM – KA & KAA – Piston Accumulator

Piston accumulators are hydroneumatic accumulators with a sliding rigid piston to separate gas side (nitrogen) and operation fluid side.

THM piston accumulators operation is based on the considerable difference in compressibility between gas (nitrogen) and operation fluid (liquid). This enables a large quantity of energy to be stored in an extremely compact form.

The piston accumulators can be used in a wide variety of applications, some of which are listed below:

• Energy storage
• Pulsation damping
• Shock absorption
• Stabilize pressure and flow
• Leakage compensation

The fluid side of the accumulator is connected to the hydraulic circuit and when the circuit pressure increases, the fluid enters in fluid side of accumulator and the gas is compressed. When the circuit pressure drops, the compressed gas expands and the stored fluid is forced into the circuit.

For the right choice of accumulator, is advisable to consider some parameters: operation fluid, pressure range, temperature, speed, response time, mounting orientation.

Advantages

There are different types of accumulators (piston, bladder, diaphragm) and accumulators provide major advantages to hydraulic circuits:

• Reduce pump size
• Reduce installed electical power
• Energy efficiency
• Increase response time

Piston accumulators have advantages over other types:

• High compression ratio ( Po ÷ Pmax)
• Horizontal mounting position
• Pressure and position monitoring possible
• Low permeation
• High oil flow rate
• Total discharge is possible
• In failure case, gradual gas loss
• Different sealing solutions (fluids, temperature, pressure, speed…)
• Optimal application solution ( changing diameter and length)