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What is a load control valve?

Functional Overview

  • A combination of a relief valve, flow control and a sequence valve.
  • Prevents runaway of cylinder or motor by metering the flow, so the load can never run ahead of the pump.
  • Locks the load and prevents it from drifting, (Low internal leakage).
  • Built in relief that prevents high pressure being trapped in the cylinder, thermal expansion and external loads
  • Maximized efficiency with large pilot ratios.
  • Setting independent of downstream pressure options.

Causes of Instability

  • Large over-hanging loads inducing changes in inlet or pilot pressure
  • Cylinder Seal friction (extension cylinder (stick-slip)
  • Trapped pressure acting on the relief part of the load control valve

Ways to reduce instability

  • Restrict pilot by adding orifice
  • If possible use a Non-vented valve
  • Add mechanical damping (Internal O rings)
  • Reduce pilot ratio
  • Internal hydraulic damping

Typical Applications – Where Used:

  • Where there is a load that could runaway.
  • Where there is the possibility of hose failure that could cause runaway. 
  • Where there is a need to lock a cylinder in position but still have overload or thermal relief.
  • As a dynamic brake for a cylinder or motor.
  • Can be used on open or closed centre systems.
  • Vented valve can be used with a proportional directional valve.

Next Generation Load Control Valves

 AIMS

  • • Stability
  • • Efficiency
  • • One valve for all applications
  • • In order to achieve stability certain applications require very low pilot ratios and extreme damping.
  • • Currently testing a new generation that has the potential for high pilot ratios (efficiency) a more controlled opening characteristic (stability).


Motor Control Manifolds

Currently we have valves designed for the following motors

  • Rexroth A2FE 32 – 63 – 90 – 110cc
  • Parker F12 30-40-60-80-90cc
  • Parker V12 60
  • SunFab SCM 047-064

Motion Control and Lock Valve

•Can be used with Closed Centre DCV

•Improved Efficiency on the drive side, less pressure drop across inlet check compared toLCV check on standard Motion Control Manifolds

•Improved Anti-cavitation performance

•Crossline Relief Function*

•*Note this could also be a limitation if a low maximum drive pressure is required the amount of braking torque will also be limited.

•More complex and therefore more expensive

What is a load control valve?
@mcs_hydraulics

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