Manually Actuated Check Valve

[derifarm]

Hello,
I have a tractor that used to have a remote cylinder that operated the belly mounted cultivators (Ford 1710 offset.) The cylinder had a little poppet valve on the rod-end end-cap with a rod that traveled parallel to the cylinder rod and an adjustable tab that would manually trip the poppet valve. From what I can tell, the valve is just check valve that is manually actuated.

So, I guess what I am looking for is a 'manually actuated pilot operated check valve'. And ideally, it would be lever operated, but rather be just a button. I've seen a lot of pilot operated check valves, but those seem to require oil to operate. I'll go take a picture of my friend's tractor and post that in a few minutes...

OK, in the picture below, you can see the rusted rod that travels parallel to the cylinder rod. The thumb screw is the tab that actuates the silvery tab that is in the middle of the picture. I don't expect to be able to get the valve integrated in to the cylinder like in the picture. My plan is to just have a check valve somewhere in the line.

Does anyone either know where I can find a cylinder like the one pictured (that would be ideal)? Or at least a pilot operated check valve that can be manually actuated?

Justin

 

[Stonehaller]

You can get plunger operated control valves. I am not sure where you would get one as compact as the one in the cylinder. We have used manually actuated Vickers valves as shown here http://hydraulics.eaton.com/products/pdfs/5018en1197a.pdf but you need a subplate so it will take up quite a bit more space.

 

[J_J]

A pilot operated check valve can be activated by any hyd valve. For instance, if you installed a pilot operated check valve in the lift arms circuit on a loader, and if you left it up, it would hold at that position, To lower the load, you activate the lever, and that sends a pilot fluid to release the valve.

100 psi will operate this valve. You also have to overcome the pressure caused by the load.

https://www.surpluscenter.com/item.asp?item=9-5537&catname=hydraulic

 

[oldnslo]

Not sure if they still make them but Deere used to have cylinders with this function. They where used to control the stroke of the cylinder. Haven't seen one in years though.

Roy

 

[derifarm]

Thanks J_J and oldnslo for your tips. I found something that should work from Prince. It's not integrated in to the cylinder, but it should still work. Once I get the part, I'll let you know. The real question is whether or not all my other welds will hold.