Hydraulic Cylinder Check Valves

[MadReferee]

</font><font color="blue" class="small">( If you only want to lock the cylinder from drifting down you need only a single pilot operated check. )</font>

Since on a double acting cylinder either port on the cylinder can be the exhaust port, you need a "double" pilot operated check valve to make sure you get no drift down.

The link to the earlier thread that I gave explains it all, in much better detail that I can.

 

[jrwattsjr]

If you lock the cylinder both direction ( in and out) yes you do need a double pilot operated check valve. If you only want to stop one direction (like in or out ) you only need a single pilot operated check. Most lift system only have one check because you want the load not go down.

 

[skipmarcy]

In the case of using my boxblade, I push just as much as I pull with it so I want it locked on both sides of the cylinder. I have the Prince double-pilotted valve on my toplink, have used it under commercial use, haven't had the slightest problem with cracking pressure nor leakdowns. It stays where I set it every time and have probably used it close to 300 hours now.