Hydraulic CLS Load Sense Relief Valve

June 1, 2021
Eaton’s CLS sectional load sense relief valve brings efficient pressure control to post-compensated hydraulic valves.


A sectional load sense relief valve (LSRV) for Eaton's CLS mobile hydraulic control valve limits individual section pressure through feed oil reduction, eliminating the need for inefficient work port reliefs for feed-side pressure control. The CLS LSRV improves machine productivity and efficiency by helping prevent functions from slowing down during multi-section actuation and by eliminating unnecessary energy consumption and heat generation.


The valve enables the use of full available inlet flow to maintain functionality during multi-section actuation and limits pressure by reducing feed oil flow, rather than dumping the flow to the tank. Once the LSRV stops oil flow when a function reaches a specific pressure, which can be lower than maximum system pressure, that flow is available to other sections at full system pressure. This helps prevent machine functions from slowing down when multiple sections are operating at once.


The CLS LSRV improves energy efficiency by minimizing the power losses that occur when using work port reliefs for feed-side pressure control. Unlike work port reliefs, which dump all oil flow to the tank, the LSRV discharges only 2 to 4 L/min. of flow to the tank, dramatically reducing energy consumption and heat generation.


The CLS sectional load sense relief valve is ideal for machinery with swing and clamp functions, including forestry equipment, excavators, and backhoes.

Rated inlet flow:CLS 180: 220 L/min (58.1 gal/min)CLS 180: 220 L/min (58.1 gal/min)Rated work port flow
(post-compensated):CLS 100: 100 L/min (26.4 gal/min) @ 14 bar differential pressureCLS 180: 180 L/min (47.6 gal/min) @ 17 bar differential pressureRated inlet pressure:350 bar (5,076 psi)Rated tank port pressure:10 bar (145 psi)Ambient operating temperature range:-40 to 60°C (-40 to 140°F)Oil temperature
operating range:-25 to 80°C (-13 to 176°F)



  • Excavators
  • Wheel loaders
  • Motor graders
  • Forestry equipment
  • Refuse trucks
  • Fire trucks
  • Forklifts
  • Telehandlers
  • Agricultural machinery
  • Truck-mounted and all-terrain cranes
  • Marine equipment