Pressure relief valve for hydraulics

[frank-c]

Hi,
I don't normally use hydraulics but I'm involved in custom building a piece of equipment which is just modifying a manual pallet truck is it possible to put a pressure relif valve on a pallet truck? would it involve much modifications?
I have a screen print of a concept attached, when the pallet truck is jacked up it will come to a physical stop but i dont want it lifting these stops but dont want it to drop down either if some type of relief valve was fitted, could the pressure be just reduced, any ideas would be greatly appreciated

 

[hydtools]

Buy a pallet pump unit with appropriate pressure capacity that has an integral relief valve.

Ted

 

[Compositepro]

I just googled "pallet jack hydraulic circuit diagram", and all the diagrams I looked at have relief valves in the circuit. It is such a basic safety step for such an application where pressure can very easily go above safe values. A safety valve will not drop your load (that would not be safe would it?). It will only bleed-off excess pressure.

 

[frank-c]

Hi,
thanks for the replys, yes what I would be looking for would be to not drop the load but just bleed of the excess

 

[TimSchrader2]

Hello I believe a pressure reducing valve should bleed off flow slower then a safety relief. The safety relief normally dumps flow to tank and will crack open before the setting is reached. We always use a press reducing valve if we want the valve to control a operation or limit press to a component. As i believe it is more stable then a relief valve.

Sunhydraulics has alot of info/graphs online or tech support by phone. If you want to define the difference.

To "positively" hold a load you can use a pilot check, check or counterbalnace valve. We use counterbalnace valve on cranes.