what is this ?

[J_J]

That valve is simply a check valve similar to these.

Surplus Center

It can be used in many different configurations.

 

[hydriv]

I neither agree nor disagree.

However, implements that use motors are connected directly to a hydraulic system that is governed by the relief valve in the rear PTO and it is set at 2200 PSI. If the valve in question cracks open at a pressure lower than the relief, then the motor cannot develop all the torque it should because the oil will bypass. Secondly, there is a dual issue here with both start and stop and in order for this "fix" to be truly effective, it would have to flow oil in both directions but at a pressure higher than the relief setting. If I am right, then this valve would be a custom made proprietary unit, not available from any source other than Case.

 

[xtn]

hydriv,

Assuming it's a one-way check valve, it's only going to work if it's oriented to flow from the return line to the supply line, or in other words, from the low pressure side to the high pressure side. So it's going to give a motor a "coast down" or "soft stop" behavior. Used in this way, the motor will develop all the torque it should because the oil will NOT bypass from low side to high side while the operator is sending full pressure fluid down the high side. It's only going to bypass when the operator shuts off the flow but the motor's inertia tries to make the fluid keep going around.

Of course if that's the case then it won't also provide "soft start" behavior.

xtn

 

[J_J]

A check valve is not a relief valve.

They usually open at low pressure, say 5 psi to about 65 psi.

Pressure is not sent , it is developed by the load work against the flow.

 

[xtn]

Thanks J_J. I do understand your specific statements.

But a check needn't have a high pressure opening point to serve the purpose I described. As long as there is some small load at the motor, the supply side will have a higher pressure than the return side, holding the check closed. If there is no load, it won't matter if the check valve opens a bit. If the operator stops sending fluid to the motor, and the motor and whatever it is turning has inertia, then the supply line leading to the motor is going to be sucked on by the motor and the check is going to open, essentially giving the coasting motor a little loop of hose for it to pump fluid around until it slows to a stop.

I think.

xtn

 

[fxdp]

ebay item number 121144596180 looks to be a close match to this valve its made by parker possibly to oem spec ?

 

[hydriv]

Thanks to both J_J and xtn for chiming in on this issue.

As I said previously, the proprietary motors ordered by Case/Ingersoll were designed with valves that would give both a soft start and a soft stop. This prevented damage to the two drive belts that powered the three-bladed mower decks and the single belt that powered the snowcaster. The hydraulically powered chipper/shredder was also belt powered and the chipper had a fairly hefty mass that spun pretty fast. The same could be said about the fan/impeller on the vacuum units because the impeller is mounted directly to the motor shaft. Everything spit out by the mower blades is sucked into the vac unit before being blown into bags or the trailer.

The problem right now is that Eastman is apparently no longer interested in the parts end of the Ingersoll brand. Whether the current recipient of the parts business is will to invest a substantial amount of cash into ordering a quantity of those motors seems doubtful. This is going to leave owners of the 3100/4100 AH tractors in peril if they can no longer buy a new motor or have their existing motor repaired. There has been much discussion about trying to find a suitable substitute motor and then figure out a way to provide the soft start/stop feature. Trying to do it with 1/2 hoses is an obvious pain. Knowing what valve to use is also a mystery. Knowing whether it is possible to use two valves is also a mystery. Essentially you seem to be saying that there is somewhat of a "pilot" aspect to the valve shown in the picture. That is something I was not aware of. Any further information you can supply would be very much appreciated.

 

[fxdp]

parker c820s 20mk 5000psi thats the best info i can take off this unit - mr hydriv if your interested in having this item, feel free to send me a private and its yours will mail it out to you np

 

[BowlBuilder]

That, sir, is a very generous offer.

 

[hydriv]

That, sir, is a very generous offer.

Yes it is....... and I have invited him to follow through on it, at his leisure.