TXV series pumps
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TXV series pumps with Load Sensing control variable displacement piston pumps A D VA N TA G E S ► TXV series pumps are variable displacement with pressure-flow control – called Load Sensing. They self-regulate to give just the flow required for each movement. ► Specifically designed for the needs of the truck hydraulics market, TXV pumps are particularly well adapted for applications in: ▪ loader cranes, ▪ forestry cranes, ▪ refuse vehicles, ▪ salt spreaders, snow and ice equipment, ▪ construction equipment vehicles. ► Extremely compact in size to allow direct flange-mounting on vehicle engine or gearbox PTOs. ► TXV pumps are available in 11 models with maximum displacement from 40 to 150 cc/rev. Maximum pressure is up to 420 bar de

displacement pump? ► Installing a TXV variable displacement pump will transform your hydraulic equipment. Slow or rapid movements are done with precision, due to the constant adjustment of pump flow rate. ► The pump incorporates a load sensing device to control flow and maximum pressure. This control device is piloted by a proportional valve which informs the pump of the flow needed for the different circuits supplied by the pump, independently of pressure. The motor driving the pump only provides the power actually needed by the equipment, thus ensuring:  longer service life of that...

TXV - How does it work ? ► TXV variable displacement pumps are of axial piston design with 11 pistons, thus ensuring optimal regularity of flow and a low noise level. ► The displacement of the pump is proportional to the stroke of the pistons. Displacement – and thus flow - is varied by changing the angle α of the swashplate (Fig.1). ► To change displacement from maximum to zero (complete flow cancellation), the swashplate angle goes from α max (Fig. 1) to α min (=0) (Fig. 2). Figure 1 - Maximum displacement Figure 2 - zero displacement Bleed screw Swashplate Bleed screw α max ► Setting the...

Pressure-flow regulation: "Load Sensing" - TXV Stand-by spring Cancellation piston Swashplate ► Zero flow (standby) The proportional valve is closed. The pressure in the P line increases until it reaches the value at which the standby spring is set. Under the pressure in the P line, the spool moves and oil flow supplies the setting piston which moves the swashplate into vertical position (angle α =0): no flow, but standby pressure is maintained.The pump stays in standby mode. ► Full flow LS line The proportional valve is fully open, allowing passage of pump flow. The pressure in the LS line...

TXV pumps are available in 11 models from 40 to 150 cc/rev maximum displacement. Pump reference Max. peak Max.speed Max. operapressure Max.speed Torque at Weight (2) at full displain stand-by ting pressure (intermittent: 300 bar (3) cement 5%) (bar) (bar) (N.m) rpm rpm (kg) ► Standa r d pump r ange TXV 40 ► With thr ough shaf t * TXV 130 * For TXV 130 through shaft available with max displacement set at : 65-75-85-95-100-110 - other specific set (on request) (1) TXV pumps can be set for smaller maximum displacements (see page 41). (2) For a mechanical efficiency at 85%. (3) Higher speed -...

Performance - TXV ► Torque absorbed as a function of pump output pressure (with a mechanical efficiency considered at 85%) Torque (N.m) 900 * TXV with through shaft ► Flow as a function of rotating speed Q (l/min) TXV 150 �n��x���� *TXV 130 with through shaft limited at 1900 rpm. Attention: the TXV indexables pumps are limited at 1750 rpm maximum. Flow as a function of speed, with pump in maximum displacement position and oil level in tank above the pump. These graphs are the results of testwork done in HYDRO LEDUC R&D laboratory, on a specific test bench with a mineral hydraulic fluid ISO...

Drain G1/2’’ connected to tank stand-by pressure setting Connection for pressure gauge G1/4’’ M10x1.5-6H (2x) Depth 15 mm to attach support device Pump reference Connection for pressure gauge G1/4" ► Support device In cases where it is necessary to use a support device (overhang torque) for the pump, this must be fixed to the same part which the pump is mounted on. ► Mass and position of centre of gravity L (mm) Pump type TXV 130 with through shaft *Support device * This support has to be designed to avoid strain on the

Maximum pressure setting Drain G1/2" to be connected to tank Standby pressure setting Connection for pressure gauge G1/4" M10x1.5-6H (2x) Depth 15mm to attach support device Connection for pressure gauge G1/4"

TXV 130 with through shaft - Dimensions T X V 1 3 0 T H R O U GH S H A F T P UM P The TXV 130 pump exists in a “through shaft” version. With side porting for inlet and output, this “through shaft” TXV 130 configuration means any LEDUC TXV pump, or fixed displacement XPi or PA pump, can be mounted on the back. The maximum displacement of the “through shaft” TXV 130 can be factory set, on request, between 60 and 110 cc/rev on request. It is important to check that maximum torque to be transmitted by the shaft of the “through shaft” TXV 130 does not exceed 900 N.m. A flange must be used when...

Dimensions - TXV 130 with through shaft T X V 1 3 0 T H R OU G H S H A F T P UM P View from F (see p.30) ► Support device The support device for the pump must be fixed to the same part which the pump is mounted on (see diagram below) and has to be designed to avoid strain on the pump flange. Support device Example of TXV with a PA pump. Maximum torque transferable by the shaft of the pump driven by the PTO: C = 900 N.m That is, the sum of torque for both pumps must be < 900 N.m. Example of TXV with a XPi pump. Please consult our Technical Department for advice regarding your installations.