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Load holding valves are pressure valves, which act always on the return flow side of double acting consumers. They block the return duct according to their set pressure (setting approx. 15% above the max. load pressure) generating a counter force to a pushing (negative) load. Therefore the pump will have to feed the inflow side, e.g. pressurizing the cylinder enough to overcome the set pressure of the load holding valve, there by dropping the load. Type LHK is intended for applications which are hardly prone for oscillations.
Type LHT features simple, whereas type LHDV elaborate special dampening equipment making them especially suited for applications together with prop. Directional spool valves (ilLoadSensingln spool valves) e.g. type PSL/PSV. Many additional options are available such as shock valves, shuttle valves with or without by pass check valve (e.g. delayed release of hydraulic brakes) etc.
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