Mobile Hydraulic Valves 101

Mobile Hydraulic Valves 101

By on February 21st, 2018 in Hydraulics

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