What is the Advantage and Disadvantage of Hydraulic Positioner Manufacturer

By Tolomatic on May 17,

OLIVET supply professional and honest service.

Hydraulic cylinders are popular automation components in many industries. Like other types of linear actuator (pneumatic and electric), they are used to move loads in a straight line. A hydraulic actuator uses the energy in a pressurized liquid, usually oil, to achieve this linear motion, as opposed to compressed air (pneumatics) or electricity.

Standard hydraulic actuators perform well in applications that require basic, end-to-end motion. However, as motion profiles get more complex, standard hydraulics have difficulties. A complex motion profile usually needs a costly servo-hydraulic actuation system or an electric linear actuator. In fact, many engineers are turning to electric linear actuators since new models can deliver the high force once thought possible only with hydraulics.

Our newest white paper compares hydraulic and electric linear actuator technologies. Download your copy here. 

There are pluses and minuses to using hydraulic actuators. Let&#;s take a look at them.

Hydraulic actuator advantages

Hydraulic linear actuators are popular for good reason.

1. High force capabilities

The ability of hydraulics to deliver high force is a leading reason for the popularity of this technology.  High pressures allow smaller cylinders to reach very large forces. For example, 3-inch and 5-inch bore cylinders at psi can achieve approximately 15,000 lbf (66,723.3 kN) and 43,000 lbf (191,273.5 kN), respectively.

2. Simple design

Hydraulic technology is well-understood, and cylinder design is straight-forward. Many engineers are quite comfortable using hydraulics.

3. Rugged construction

Hydraulic actuators have a reputation for being tough enough to withstand harsh conditions. They can be durable and reliable when deployed in the right applications.  Their robust design means they can handle shock loads.

4. Affordable

The initial purchase price of hydraulic cylinders is usually low.

Hydraulic actuator disadvantages

1. Limited motion control capabilities

When multiple stops and changes in velocity are part of the motion profile, hydraulic cylinders have problems. Also, position, speed and force consistency are subject to worn seals, leaks and pressure changes from the pump.

2. Inflexibility

Basic hydraulic actuators are not programmable.  Changes in force, velocity and other variables are made through time-consuming manual adjustments which may be imprecise. Servo-hydraulic actuation systems are programmable, but they have more components that add complexity, space, and cost.

3. Inadequate data collection capabilities

Data collection and reporting are required in many manufacturing environments as part of continuous improvement processes. Hydraulic cylinders need expensive, complex servo-hydraulic systems with additional sensors to track and monitor what&#;s happening at the work point.

4. High maintenance

Hydraulic cylinders are rugged devices, but they require frequent maintenance and attention to perform well. Maintaining the integrity of the rod and piston seals is key because these are the main elements that contain pressure. Changing oil filters and oil must be done periodically since contaminated or degraded oil hurts system operation.

5. Low operating efficiency

Hydraulic systems typically operate in the 40-55% efficiency range. While this is better than that of pneumatic systems (10-20%), it is much lower than that of electric systems (75-80%). Additionally, with hydraulics the power unit keeps the hydraulic system pressurized when the system is turned on, resulting in inefficient use of power.

6. Large system footprint

A hydraulic actuator system's components take up valuable space.  Even though hydraulic cylinders offer a compact footprint at the work point, the hydraulic power unit (HPU) that regulates flow and pressure to cylinders requires a large amount of floor space. Systems include the cylinder, the power unit to provide oil pressure, control and accessory valves, filters, hoses, fittings, and additional components.

The company is the world’s best Hydraulic Positioner Manufacturer supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

7. Temperature sensitivity

Both hot and cold temperatures affect the performance of hydraulic cylinders.  Heat can destroy seals resulting in loss of pressure. Cold temperatures will thicken the system&#;s oil and slow response.

Study your application and all its requirements carefully before you settle on an actuation technology. If you need a programmable, efficient, low-maintenance actuator that can handle a complex motion profile, consider an electric linear actuator. 

A later edition of this blog will compare hydraulic and electric actuation. Plus, our white paper gives you an in-depth comparison.

Learn more

Download our white paper that compares hydraulic and electric linear actuator technologies.

Advantages and disadvantages of hydraulic system.

Hydraulic valves are widely used in water, steam, sewage, papermaking, petrochemical industry, solution and slurry two phase mixed flow medium, and dust gas, granular fluid, powder solid medium transport equipment.
Using hydraulic operation, more convenient for management automation, remote control, equipped with hydraulic signal device, can be used for automatic operation and centralized control.

Advantages of hydraulic butterfly valve:

1) Simple structure, compact and small volume;
2) Stable and reliable transmission;
3) A large output torque can be obtained;
4) The output torque can be accurately adjusted through the constant pressure relief valve, including the adjustment of opening and closing torque, and can even be directly reflected by the hydraulic instrument;
5) Convenient speed adjustment;
6) In case of sudden power failure, the accumulator can still be used for one or several power operations.
This is of special significance to automatic emergency cut-off valve and wellhead blowout valve in long &#; distance pipeline.

Disadvantages of hydraulic valves:

1) The oil temperature is greatly affected by the ambient temperature, and the change of oil temperature causes the change of oil viscosity, which affects the operation;
2) Troublesome piping, easy leakage;
3) It is not suitable for generating various operations on the signal (such as signal amplification, memory, logical judgment and other operations).

Advantages of hydraulic system:

1. Small size and light weight;
2. High stiffness, high precision and fast response;
3. Large driving force, suitable for heavy load direct driving;
4. Wide speed control range and various speed control modes;
5. Self-lubrication, self-cooling and long life;
6. Easy to realize security protection.

Disadvantages of hydraulic system:

1. Poor resistance to working fluid pollution;
2. Sensitive to temperature changes;
3. Hidden danger of leakage;
4. Difficult manufacturing and high cost;
5. It is not suitable for long-distance transmission and requires hydraulic energy.

If you are looking for more details, kindly visit Remote Control Welding Positioner Factory.