Case 580 CK Swing Cylinder flow restrictor ?

[wdchyd]

I thought they floated also, but came across this.

It looks like some of the restrictor have a spring associated with them.

http://www.princehyd.com/Portals/0/Valves.pdf

Pages V10 ,V28

It mentions restrictor and conical spring.

That series 20 valve looks like a Gresen hyd valve....is it possible Prince bought that from Parker (Gresen)..??

and yes, some manufacturers use springs, especially velocity fuse (hose-break) valves on forklift cyls

 

[1woody]

I did get a blow up of the parts schematic today and there was no spring in the restrictor assembly. I am now convinced that from the responses above that this particular restrictor should "float". I spoke to an old timer today and he said that the restrictor was used to prevent erratic movement of the boom. He said that because ther are two swing cylinders not working in tandem as in a loader bucket there needs to be a balance to control a violent swing of the boom. With the holes in the restrictor placed as they are it restricts flow in one directon and allows almost full flow in the reverse direction.I just picked up the rechromed swing cylinder rods today with new seals and hope to have the bushings for the trunions soon. I will reinstall the restrictors as they were removed ' floating" and let you know how they work Thanks for all your help.

 

[IceStationZebra]

I thought they floated also, but came across this.

It looks like some of the restrictor have a spring associated with them.

http://www.princehyd.com/Portals/0/Valves.pdf

Pages V10 ,V28

It mentions restrictor and conical spring.

Pairing a suitably stiff spring with a floating restrictor makes it viscosity and velocity sensitive, which can be good or bad depending on what you want. This is basically what is used in forklifts to limit the lowering speed when loaded, but allow unrestricted lowering when unloaded.

ISZ