variable displacement pumps

■■ Range and characteristics . . . . . . . . . . . . . . . . . . . . . . . 1 ■■ Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ■■ Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 . . ■■ Control devices . . . . . . . . . . . . . . . . . . . . . . . . . . 4 to 8 . . ■■ Delta pump with constant torque LS control. . . . . . . . . . 9 ■■ Fittings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ■■ Shaft sealing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 ■■ Installation and start-up recommendations....

Maximum operating pressure (bar) Maximum Max operating peak pressure pressure at flow (intermittent cancelation 5%) (bar) These are the references of the pump alone. When ordering, also specify the reference of the required control device. See page 4. ■■Setting pump maximum displacement setting screw of maximum flow The DELTA pumps from 40cc to 92cc are made as standard to be able to use the setting screw. The pump displacement can thus be adjusted to exactly what is needed. ■■How to use the setting screw Unscrew 1 completely, loosen 3 and screw 2 to the required displacement. See figure above....

control device setting screw of maximum flow minimum flow pin (optional extra) For other shafts, please contact our Technical Department. ■■DELTA connections (other port styles available) 2 x M10 depth 15 to attach support device CW Dimensions are given only as an indication.

■■Flow Flow as a function of speed and displacement of the pump. GPM Q (Gpm/min.) 52 Calculating power as a function of torque 0 1000 ■■Required torque at maximum displacement (theoretical hydraulic power) where: N = speed in rpm ΔP = working pressure in bar Q = flow in l/minute ■■Ideal installation: tank above the pump ■■Volumetric efficiency Viscosity 100 cSt, inlet at air pressure. These graphs are the results of tests carried out by the HYDRO LEDUC Research Laboratory, on a specific test bench, with ISO 46 fluid at 25°C (100 cSt), a 50 mm diameter supply line 1.5 m long, and a tank with oil...

Constant Pessure remote control constant pressure 0519340 + adjustable displacement screw 0512602 constant pressure with minimum flow control flow-pressure regulation remote control flow-pressure regulation plate + fixation screw ■ PC - Constant Pressure The pressure control maintains constant pressure in the hydraulic system. As soon as pressure reaches the level set on the control, the flow of the pump automatically regulates itself according to what the application requires. This minimizes system heat and energy for those applications requiring pressure to be held constant. Examples: -- hydraulic...

■■PCD - Remote control constant pressure This allows to control the pressure setting according to the requirements of the different devices within the circuit. Examples: -- control of a cylinder under maximum pressure of 300 bar, -- control of a hydraulic motor at 200 bar. setting screw of maximum flow connection for pressure gauge safety valve of the circuit T (drain G 3/8") direction of rotation T (drain G 3/8") external relief valve (not supplied

■■PCDM - constant pressure with minimum flow control Constant pressure with minimum flow control : PCDM (can also be remote PCD-DM). This is used in every case where the reduction of the main flow must still allow the flow of a separate device. trust minimal flow Q max displacement ■■Capacity to control minimum displacement The DELTA pumps are designed to regulate flow from maximum flow to flow cancellation mode. However, some applications require a minimum outlet flow to be maintained, regardless of how flow is controlled from maximum to minimum. The PCDM control device must always be used with...

Principe de régulation de pression ■■LS - Flow–pressure control ■■Contrôle Q et P (LS : Load-Sensing) ■■Principle of pressure control This control device (LS) enables the flow and the maximum output pressure of the pump to be controlled continuously. From this, it is easy to imagine all possible combinations: -- large flow and small pressure, -- high pressure and small flow. This type of control can be fitted with remote control to control pressure and flow. ■■Principle of flow-pressure control The flow of the pump Q through the application E must ensure a constant ΔP set at 20 to 30 bar. S:...

■■LSD - Remote control flow-pressure regulation ■■Flow-pressure regulation ■■Principle of flow-pressure control This control device means flow can be controlled continuously with remote control pressure compensation (LSD). The flow of the pump Q through the application E must ensure a constant ΔP set at 20 to 30 bar. S: surface of the cross section of oil passage The pressure is controlled via an external pressure relief valve (not supplied). Each time the ΔP varies due to a change at E, the pump will vary its flow Q to suit and to ensure: ΔP = constant. E can be: -- a flow control, -- a proportional...

■■DELTA pump with constant torque LS control Description This constant torque control for the DELTA pumps ensures that the power installed in the circuit cannot be exceeded, whilst still allowing control of flow and of maximum circuit pressure. The constant torque LS control is available for DELTA pumps of 40, 60, 75, 92 and 92cc. The dimensions of the constant torque LS control are the same as for the standard LS valve. Warning: this control device can only be associated with a DELTA pump provided with a constant torque LS control. Direction of rotation DELTA 40 DELTA 60 DELTA 75 DELTA 92 Maximum...

■■Inlet fittings To be used on the inlet orifice of the DELTA pumps. 90° elbow fittings, swivel Straight fittings ■■Force on pump shaft Fr : acceptable max radial force = 3000 N, Fa : acceptable axial force = 1600 N. ■■Optimization of the transmission of power to the shaft of the pump vue pour: optimisation de la transmission de puissance à l'arbre de la pompe gear drive vue pour: optimisation de la transmission de puissance à l'arbre de la pompe vue pour: optimisation de la transmission de puissance à l'arbre de la pompe belt drive vue pour: optimisation de la transmission de puissance à l'a