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Hydraulic Actuators

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  • Torque Range:1700-220000 Ib
  • Pressure:160-250 bar
  • Bearing Capacity:High
  • Internal Leakage:None
  • Shock resistance:High
  • hydraulic rotary actuator Backlash:Low
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Hydraulic Actuators Introduction

Hydraulic actuators use liquid pressure rather than instrument air pressure to apply force on the diaphragm to move the valve actuator and then to position valve stem.


Nearly all hydraulic actuator designs use a piston rather than a diaphragm to convert fluid pressure into mechanical force.


The high pressure rating of piston actuators lends itself well to typical hydraulic system pressures, and the lubricating nature of hydraulic oil helps to overcome the characteristic friction of piston-type actuators.


Given the high pressure ratings of most hydraulic pistons, it is possible to generate tremendous actuating forces with a hydraulic actuator, even if the piston area is modest.



In addition to the ability of hydraulic actuators to easily generate extremely large forces, they also exhibit very stable positioning owing to the non-compressibility of hydraulic oil.


Unlike pneumatic actuators, where the actuating fluid (air) is “elastic,” the oil inside a hydraulic actuator cylinder does not yield appreciably under stress. If the passage of oil to and from a hydraulic cylinder is blocked by small valves, the actuator will become firmly “locked” into place.


This is an important feature for certain valve-positioning applications where the actuator must firmly hold the valve position in one position.


Some hydraulic actuators contain their own electrically-controlled pumps to provide the fluid power, so the valve is actually controlled by an electric signal.

Hydraulic Actuators Feature

Hydraulic actuators are a good choice when:


The movement you need to control is simple, without speed changes or multiple stops and starts.


You cannot afford “wiggle room.” There is no give in hydraulic pressure because it is virtually impossible to compress fluid, so hydraulic actuators can maintain force and torque steadily. For applications that require smoother travel, a cable-style, low-pressure hydraulic actuator may be the best choice.


For instance, if you need to raise and lower the platform on a parts elevator, smooth travel is essential. When the platform stops, a hydraulic actuator will hold it stationary. If you were to use a pneumatic actuator, any slight change in air pressure could cause the platform to move a little. Another good example is when you need to spray a smooth, uniform coating on a part.


The operating environment includes harsh conditions. Hydraulic actuators are both durable and reliable under duress, including shock loads. This is why you often see them used for outdoor applications. That said, in some working environments, temperature extremes can affect hydraulic performance either by causing premature seal failure or changing the viscosity of the hydraulic fluid.


Hydraulic Actuators Specification 

MODELS

 

19284773105140180240

Drive Torque Nm@21MPa

190028004700730010500140001800024000
Holding Torque Nm@21MPa49006800120001800026000350004600059000
Moment Capacity Cantilever Moun Nm52007100119001840029500388005590072900
Straddle Moun 180°Nm134001690030800478007510098900130500170000
Straddle Moun 360°Nm19200246004540071200111500146000197700256500
Radial Capacity kg1800230036005000680082001000011800
Axial capacity kg14001800270036004500590068008200
Displacement 180°492688118018702680354046506000
Displacement 360°98013902360347053607080932012000
Weight 180°kg34.55072110160220280360
Weight 360°kg45.563.4100140200290370455
D1 Overail flange diameter mm200235280315355396442475

-Manuals

Hydraulic Actuators

-Data sheet


Hydraulic Actuators Application


Based on their inherent strengths and weaknesses, hydraulic linear actuators are typically best for applications such as:

  • Opening and closing damper doors

  • Clamping

  • Welding

  • Presses

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