Mobile Hydraulic Valves 101

Unlike industrial NFPA (National Fluid Power Association) hydraulic valves, mobile valves have no standards, no common mounting and no direct interchange. These valves can be a simple, single-spool Monobloc-style valve or a more complicated 10-spool sectional valve stack. The question is… how do you replace a valve that you might already have in service or what parameters are required to specify a new valve.

Initial Check List:

  • What is the flow rate from the pump feeding the valve or multiple valve stack
  • Is it an open center circuit or closed center
  • How many functions (spools) are there
  • What are the functions for each spool, cylinder spool, Motor spool
  • What is the relief valve and pressure setting (if required)
  • What is the maximum working pressure
  • Port size, inlet/outlet working ports, related to flow rate
  • Operator, manual lever, solenoid or both

These are just a few of the many alternatives that may be involved. Mobile valves can have many more options built into the body of the valve section, inlet, outlet or mid-inlet sections. It’s very common to have individual port reliefs in all, or selected sections, set at different pressures.

Other more complicated options could include:

  • Pre/Post compensated flows rates at each section
  • Power-beyond, pressure limiting, stroke adjustments
  • On/off solenoids
  • Proportional controls
  • Load sensing

You can count on RG Group for excellent quality and service

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