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Unit dimensions: Type LPS / A; NG40 and 80 ______________________________________________________ 12 Unit dimensions: Type LPS / P; NG40 and 80 ______________________________________________________ 14 Unit dimensions: Type LPS / R; NG40, 80, and 120 __________________________________________________ 15 Unit dimensions: Type LPS / R; NG160 ___________________________________________________________ 17

Chapter 1 IntroductionTopics: • Features • Ordering details • Function, section • Version, symbols • Technical data • Pressure fluid technical data • Unit dimensions: type LPS/ A; NG40 and 80 • Unit dimensions: type LPS/ P; NG40 and 80 • Unit dimensions: type LPS/ R; NG40, 80 and 120 • Unit dimensions: Type LPS/ R; NG160

• The LPS priority valve is used in conjunction with steering units using load sensing. • The priority valves guarantee the priority supply of steering circuits - before all other implement hydraulics - with pressure fluid as defined in legal regulations or standards. • The steering circuit is supplied with priority independently of pressure. Pressure fluid that is not required for steering is returned to tank or is made available to other implement hydraulics. For supplying the steering system and other implement hydraulics, e. g. working hydraulics, only one pump is required. • With the aid...

Table 1 Model code details 1 Nominal size- max. flow into P-port 2 Mounting and connection type 3 When testing the machine, the system can be optimized by changing the orifices. 4 Please take note! The LD damping orifice has to be larger than the LD dynamic orifice. • The type LPS priority valves are used in conjunction with steering systems of closed center -load sensing design. They distribute the pump flow between the steering and implement hydraulics, whereby the steering supply has priority (see the sectional view in its initial position). • In conjunction with variable displacement pumps...

CF Steering (control flow) EF Work hydraulics (excess flow) A2 Metering orifice (in steering unit) WHITE can accept no responsibility for possible errors in catalogues, brochures, and other printed material. WHITE reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed. All trademarks in this material are the property of the respective companies. WHITE and the WHITE logotype are trademarks of WHITE Drive Motors & Steering LLC and...

Versions, symbols Standard version- Flangeable The LPS..A.. priority valve is directly flanged onto the steering unit. Both components result in a compact unit. No piping is required between the priority valve and the steering unit. This design is available with the nominal flows of 40 and 80 l / min. It is suitable for steering units up to 200 cm3/U. The pilot control pressure relief valve for limiting the steering pressure is contained within the steering unit. Figure 3 Symbol LPS..A.. Standard version-line mounting and pump mounting The LPS..R.. priority valve is a version suitable for in-line...

Special version- with throttle check valve as PP damper1 The priority valve with an additional check valve for bypassing the PP dampening orifice in the direction of opening is provided only for use in conjunction with variable displacement pumps and was specifically developed for this purpose. This special version provides fast closing of control orifice A1 and suppresses a pressure drop in CF for power- assisted steering in the case of a sudden pressure drop in work hydraulics EF. Figure 5 LPS with throttle check valve as PP damper Special version- with throttle check valve and CF max. pressure...

Via the LD dynamic orifice a continuous small flow is passed into the load signal lines from the CF pressure connection. It is therefore guaranteed that the load signal lines are always full. This leads to the priority valve having short reaction times. The dynamic orifice also takes over the unloading the CF connection when the steering does not accept any oil flow and the implement hydraulics are being operated with high pressure. P Pump CF Steering EF Work hydraulics T Tank LD Load signal (dynamic) Table 2 Technical data 1The cleanliness classes specified for components must be adhered to...

Limiting viscosity For the limiting conditions the following values apply: vmin = 10 mm2/s at a max. permissible temperature of ϑmax = + 80 °C vmax = 800 mm2/s Temperature range (see selection diagram) ϑmin = – 20 °C ϑmax = + 80 °C If there is the possibility of there being a temperature difference of more than 20 °C between the steering unit and the pressure fluid, then either a LD or LDA version or an open center version for warming the steering unit should be fitted. Further on the selection of pressure fluids A prerequisite to being able to select the correct pressure fluid is knowing the...

Figure 7 Selection diagram Unit dimensions: Type LPS / A; NG40 and 80 Figure 8 Unit dimensions in mm WHITE can accept no responsibility for possible errors in catalogues, brochures, and other printed material. WHITE reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed. All trademarks in this material are the property of the respective companies. WHITE and the WHITE logotype are trademarks of WHITE Drive Motors & Steering LLC...

3 valve fixation screws M10X401 DIN 912-10.9; MA = 60+5Nm 1 included in the scope of supply Table 3 Thread type WHITE can accept no responsibility for possible errors in catalogues, brochures, and other printed material. WHITE reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed. All trademarks in this material are the property of the respective companies. WHITE and the WHITE logotype are trademarks of WHITE Drive Motors & Steering...