How can a hydraulic cushion valve prevent jerking loads on a gillnet reel?

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SUMMARY

The discussion focuses on the use of hydraulic cushion valves to mitigate jerking loads on gillnet reels powered by hydraulic motors. Users report that the jerking motion occurs when the motor is activated or deactivated, leading to potential damage from pressure spikes. Implementing an inline hydraulic cushion valve can effectively reduce these jerking motions, while a pressure relief valve set above pump pressure can further safeguard against pressure spikes. Additionally, adjusting the operation of hand-controlled directional valves can help minimize jerking by allowing for smoother transitions.

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  • Understanding of hydraulic systems and components
  • Knowledge of hydraulic motors and their operation
  • Familiarity with directional control valves and their adjustments
  • Basic principles of pressure relief mechanisms in hydraulic systems
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  • Research the specifications and installation of inline hydraulic cushion valves
  • Learn about pressure relief valve settings and their impact on hydraulic systems
  • Explore best practices for maintaining hydraulic motors in commercial fishing applications
  • Investigate the effects of chain tension on hydraulic reel performance
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This discussion is beneficial for commercial fishermen, marine engineers, and anyone involved in the maintenance and operation of hydraulic systems on fishing vessels.

kellym
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I have a commercial fishing boat with a gillnet reel,basically a large winch. The reel is powered by a hydraulic motor and a chain drive/sprocket setup. It uses a reversing hydraulic valve with load checks,I think they are called. When the motor is activated/deactivated it comes to a complete stop and puts a hard jerking load on the reel. I have to use the valve with load checks to hold the reel in position when stopped so it won't back off in high winds. Will an inline hydraulic cushion valve take the jerking motion off the motor? Thank you
 
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Why is a jerking load on the reel a problem? If the jerk causes pressure spikes that bursts hoses or couplings, sheared shaft keys or broke the chain then there would be a problem. A pressure relief valve across the motor, set slightly above the pump pressure will reduce pressure spikes to safe levels.

If it is a hand operated directional control valve then moving your hand slower should increase the transition time and reduce the jerk.

Why do the jerks occur now? What has changed recently, is the chain new or too tight? There needs to be some give in the system.
 

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