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Accumulators

A hydraulic accumulator is a device in which potential energy is stored in the form of a compressed gas or spring, or by a raised weight to be used to exert a force against a relatively incompressible fluid. They are used in fluid power systems to accumulate energy and to smooth out pulsations. A hydraulic system utilizing an accumulator can use a smaller fluid pump since the accumulator stores energy from the pump during low demand periods. This energy is available for instantaneous use, released upon demand at a rate many times greater than could be supplied by the pump alone. Accumulators can also act as surge or pulsation absorbers, much as an air dome is used on pulsating piston or rotary pumps. They will cushion hydraulic hammer, reducing shocks caused by rapid operation or sudden starting and stopping of power cylinders in a hydraulic circuit. There are four principal types of accumulators, the weight loaded piston type, diaphragm (or bladder) type, spring type and the hydro-pneumatic piston type. The weight loaded type was the first used but is much larger and heavier for its capacity than modern piston and bladder types. Both the weighted type, and mechanical spring type are very seldom used today. The hydro-pneumatic types use a gas as a spring cushion in conjunction with a hydraulic fluid, the gas and fluid being separated by a thin diaphragm or a piston. Eliminating the need for large hydraulic pumps and electric motors. An accumulator in the system ensures the correct volume of oil at the correct working pressure, even in emergency situations and compensates for variations in leakage and temperature, dampens pressure and flow pulsations, maintains system pressure when the hydraulic pump is switched off and provides hydraulic suspension. Basic criteria, such as: Design pressure, Design temperature, Fluid displacement volume, Discharge/ Charging velocity, Fluid, Acceptance specifications and also Mounting options are important parameters required for sizing the correct accumulator Central Queensland Hydraulics provides a full range of bladder accumulators, membrane accumulators and piston accumulators. They can be used in a wide range of applications such as energy storage, pulsation dampening or surge alleviation. Accumulators have many different applications; we have listed some of the most popular below:

Shortening of Response Time

Because of their instant response time, accumulators will provide fluid to fast acting valves, thereby reducing the dwell time for actuator response. Accumulators are especially effective in proportional and servo valve circuits.

Energy Conservation

Accumulators can reduce energy costs in a variety of applications. By assisting the flow output for pumps with intermittent duty cycles, the accumulator will reduce system horsepower requirements. When combined with variable volume, pressure-compensated pumps, accumulators not only reduce horsepower requirements, but they will also assist with rapid flow demands.

Absorption of Hydraulic Line Shock

Accumulators can take the shock out of a line when a valve closes or some other action occurs, resulting in "water hammer." By reducing line shock, system components such as pumps, valves, hoses and fittings are not subjected to pressure spikes; thus extending the life of each of your components.

Emergency Standby Power - Electrical Power Failure

By having fully-charged accumulators integrated into a circuit, should an electrical power failure occur, the accumulators will supply enough flow and pressure to complete a cycle, close a valve or move an actuator. Using accumulators as emergency power will ensure an electrical failure does not permanently damage your system or cause other undesirable effects.

Emergency Standby Power - Immediate Response

When large volumes of fluid are required in a fail-safe situation to actuate large valves, cylinders or rams, a charged accumulator or group of accumulators will provide an instantaneous response. Large banks of accumulators called Blowout Preventer Control Systems (BOP Units) provide emergency power to prevent blowouts during drilling and exploration.

Auxiliary Power Source 

Accumulators can be used to supplement pump flow for intermittent high demands in many systems. By using accumulators, pump size and required horsepower can be dramatically reduced.

Pressure Holding

Accumulators are used extensively to hold pressure in a circuit, especially where actuators are used. The accumulator makes up for any leakage and maintains system pressure when all valving is closed.

Compensation for Thermal Expansion and Contraction

Accumulators are especially effective when heat causes the volume of a system's fluid to expand. In systems where "hard" piping is installed, an accumulator is extremely important to prevent lines and pipes from rupturing due to thermal expansion of fluid. When fluids instead contract due to cooling, accumulators can make up for diminishing volume.

Compensation for Fluid Leakage

Accumulators can ensure that your system fluid volume pressure maintains an even level despite any internal leaks; especially important if your system contains spool valves, cartridge valves or hydraulic cylinders.

Dispenser for Pressurised Lubricants

Accumulators are an excellent choice for the precise dispersion of fluids for lubrication. Flow controlled by an accumulator is pulsation free.

Prevention of Pump Cavitation

When installed on the inlet side of certain pumps, accumulators will greatly diminish or prevent cavitation. Accumulators provide fluid immediately should head pressure be lost upon pump start-up.

Noise Attenuation

Accumulators are extremely effective in reducing the noise of hydraulic systems caused by piston pumps, relief valves and the complexities of some hydraulic circuits. Noise attenuation of up to 95% can be achieved in many systems. As with all hydraulic products, the correct selection, installation, operation and maintenance by qualified personnel is the users' responsibility. Please Contact Us for assistance in recommending an accumulator for your application.

Hydraulic Accumulators

accumulators

Types of Hydraulic Accumulators

Accumulator Range

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Accumulators A hydraulic accumulator is a device in which potential energy is stored in the form of a compressed gas or spring, or by a raised weight to be used to exert a force against a relatively incompressible fluid. They are used in fluid power systems to accumulate energy and to smooth out pulsations. A hydraulic system utilizing an accumulator can use a smaller fluid pump since the accumulator stores energy from the pump during low demand periods. This energy is available for instantaneous use, released upon demand at a rate many times greater than could be supplied by the pump alone. Accumulators can also act as surge or pulsation absorbers, much as an air dome is used on pulsating piston or rotary pumps. They will cushion hydraulic hammer, reducing shocks caused by rapid operation or sudden starting and stopping of power cylinders in a hydraulic circuit. There are four principal types of accumulators, the weight loaded piston type, diaphragm (or bladder) type, spring type and the hydro-pneumatic piston type. The weight loaded type was the first used but is much larger and heavier for its capacity than modern piston and bladder types. Both the weighted type, and mechanical spring type are very seldom used today. The hydro-pneumatic types use a gas as a spring cushion in conjunction with a hydraulic fluid, the gas and fluid being separated by a thin diaphragm or a piston. Eliminating the need for large hydraulic pumps and electric motors. An accumulator in the system ensures the correct volume of oil at the correct working pressure, even in emergency situations and compensates for variations in leakage and temperature, dampens pressure and flow pulsations, maintains system pressure when the hydraulic pump is switched off and provides hydraulic suspension. Basic criteria, such as: Design pressure, Design temperature, Fluid displacement volume, Discharge/ Charging velocity, Fluid, Acceptance specifications and also Mounting options are important parameters required for sizing the correct accumulator Central Queensland Hydraulics provides a full range of bladder accumulators, membrane accumulators and piston accumulators. They can be used in a wide range of applications such as energy storage, pulsation dampening or surge alleviation. Accumulators have many different applications; we have listed some of the most popular below: Shortening of Response Time Because of their instant response time, accumulators will provide fluid to fast acting valves, thereby reducing the dwell time for actuator response. Accumulators are especially effective in proportional and servo valve circuits. Energy Conservation Accumulators can reduce energy costs in a variety of applications. By assisting the flow output for pumps with intermittent duty cycles, the accumulator will reduce system horsepower requirements. When combined with variable volume, pressure-compensated pumps, accumulators not only reduce horsepower requirements, but they will also assist with rapid flow demands. Absorption of Hydraulic Line Shock Accumulators can take the shock out of a line when a valve closes or some other action occurs, resulting in "water hammer." By reducing line shock, system components such as pumps, valves, hoses and fittings are not subjected to pressure spikes; thus extending the life of each of your components. Emergency Standby Power - Electrical Power Failure By having fully-charged accumulators integrated into a circuit, should an electrical power failure occur, the accumulators will supply enough flow and pressure to complete a cycle, close a valve or move an actuator. Using accumulators as emergency power will ensure an electrical failure does not permanently damage your system or cause other undesirable effects. Emergency Standby Power - Immediate Response When large volumes of fluid are required in a fail-safe situation to actuate large valves, cylinders or rams, a charged accumulator or group of accumulators will provide an instantaneous response. Large banks of accumulators called Blowout Preventer Control Systems (BOP Units) provide emergency power to prevent blowouts during drilling and exploration. Auxiliary Power Source Accumulators can be used to supplement pump flow for intermittent high demands in many systems. By using accumulators, pump size and required horsepower can be dramatically reduced. Pressure Holding Accumulators are used extensively to hold pressure in a circuit, especially where actuators are used. The accumulator makes up for any leakage and maintains system pressure when all valving is closed. Compensation for Thermal Expansion and Contraction Accumulators are especially effective when heat causes the volume of a system's fluid to expand. In systems where "hard" piping is installed, an accumulator is extremely important to prevent lines and pipes from rupturing due to thermal expansion of fluid. When fluids instead contract due to cooling, accumulators can make up for diminishing volume. Compensation for Fluid Leakage Accumulators can ensure that your system fluid volume pressure maintains an even level despite any internal leaks; especially important if your system contains spool valves, cartridge valves or hydraulic cylinders. Dispenser for Pressurised Lubricants Accumulators are an excellent choice for the precise dispersion of fluids for lubrication. Flow controlled by an accumulator is pulsation free. Prevention of Pump Cavitation When installed on the inlet side of certain pumps, accumulators will greatly diminish or prevent cavitation. Accumulators provide fluid immediately should head pressure be lost upon pump start-up. Noise Attenuation Accumulators are extremely effective in reducing the noise of hydraulic systems caused by piston pumps, relief valves and the complexities of some hydraulic circuits. Noise attenuation of up to 95% can be achieved in many systems. As with all hydraulic products, the correct selection, installation, operation and maintenance by qualified personnel is the users' responsibility. Please Contact Us for assistance in recommending an accumulator for your application.
Hydraulic Accumulators
accumulators

Types of Hydraulic Accumulators

Accumulator Range