Hydraulic Damper

[BEMPE16524]

Hello Guys,

I need some help. This photo is showing a dampener system (hydraulic cylinder and double accumulators).

SWL of the system is 50 Ton.

The movement of the pivoted point is very minor (I think not more than 3 degrees).

So, I am not familiar with the system, do you know if there is any type of valves that is needed to be attached to the cylinder for the damper also?
Also, what type of hydraulic cylinder is that? I saw one side of the rod already corroded (not sure if that side is also for working) or maybe it is covered by Denso tape?.
If you can give me a link to the supplier I will be really appreciate.

Thanks in advance.

 

[BEMPE16524]

in addition, I don't have any hydraulic diagram of the system also.

 

[BEMPE16524]

I think I have to create the system from scratch. so I have this diagram, but still in doubt about the hydraulic cylinder configuration. not sure if the spring in the cylinder is still necessary. Any idea would be appreciated.

 

[Seahydros System]

I need some help. This photo is showing a dampener system (hydraulic cylinder and double accumulators).

SWL of the system is 50 Ton.

The movement of the pivoted point is very minor (I think not more than 3 degrees).

So, I am not familiar with the system, do you know if there is any type of valves that is needed to be attached to the cylinder for the damper also?
Also, what type of hydraulic cylinder is that? I saw one side of the rod already corroded (not sure if that side is also for working) or maybe it is covered by Denso tape?.
If you can give me a link to the supplier I will be really appreciate.

Thanks in advance.

Hi [Name],

Yes, for a hydraulic damper system with accumulators and limited pivot movement (~3°), you’ll typically need:

Flow control valve – to manage damping speed

Check or overcenter valve – for safety and load holding

Relief valve – to handle pressure spikes

The cylinder might be a double-rod type if both ends are visible. If one rod appears corroded or wrapped, it could be a non-working end, possibly protected with Denso tape.

Hello Guys,

I need some help. This photo is showing a dampener system (hydraulic cylinder and double accumulators).

SWL of the system is 50 Ton.

The movement of the pivoted point is very minor (I think not more than 3 degrees).

So, I am not familiar with the system, do you know if there is any type of valves that is needed to be attached to the cylinder for the damper also?
Also, what type of hydraulic cylinder is that? I saw one side of the rod already corroded (not sure if that side is also for working) or maybe it is covered by Denso tape?.
If you can give me a link to the supplier I will be really appreciate.

Thanks in advance.

View attachment 8224

Hi,

Yes, for a hydraulic damper system with accumulators and limited pivot movement (~3°), you’ll typically need:

• Flow control valve – to manage damping speed
• Check or overcenter valve – for safety and load holding
• Relief valve – to handle pressure spikes

The cylinder might be a double-rod type if both ends are visible. If one rod appears corroded or wrapped, it could be a non-working end, possibly protected with Denso tape.



Best regards,
SEA Hydrosys | Custom Hydraulic Cylinder Manufacturers]

 

[BEMPE16524]

Hi SeaHydrosys, i appreciate your input. Only i think that the cylinder is double acting type because we have the load from both directions pivoted on the pin. Thanks.

 

[3DDave]

Any chance for a photo that shows how the hydraulic lines are attached and with enough pixels to tell what the weld in the middle is for?

 

[BEMPE16524]

Any chance for a photo that shows how the hydraulic lines are attached and with enough pixels to tell what the weld in the middle is for?

No Dave. I don't have any info on that particular section.

 

[BEMPE16524]

I checked again my diagram, and missing something, so here is the updated one:

again I explain, only one side is loaded at a time. the hydraulic cylinder is purely to receive the external impact (one side at a time), no directional control is needed.

 

[3DDave]

It still isn't a damper, just a hydraulic spring. No flow moves through the flow control valves as part of the motion of the assembly. If the pressure relief valves open, then there is nothing to make up for the lost oil so the cylinder will cavitate. If flow is constantly available then the accumulators will fill to capacity and be rigid - unable to accept more oil.

Since there is pressure on both sides the rod will end up trying to fully extend and, if the forces balance there will be no load required to cause the piston to move as whatever load increase there is on one side, there will be a matching decrease in pre-load on the other.

Picture anchoring both ends of a slinky a few feet apart and then grabbing the middle and expecting it to be rigid.

At the least, the check valves need to be in parallel to the flow control valves, allowing free-flow in one side and restricted flow out the other, depending on direction. Then there is no need for the individual accumulators, just one on the pump side to ensure adequate flow during transients.