We use Bafco slide valves out of Pennsylvania and have rarely had issues. We use this hydraulic system for both slide valves, our regen/Rx differential valve, expander bypass valve, CO boiler inlet and bypass valves. Mechanically, these valves are superior. We go 4-5 years between maintenance on them, including hydraulic fluid filter change out. I highly recommend them to anyone having issues with their hydraulic valve systems.