Читать книгу Hydraulic Fluid Power - Andrea Vacca - Страница 85

The system in figure consists of a fixed displacement pump and a variable orifice in parallel with a pressure relief valve. The pressure relief valve limits the maximum pressure at the pump outlet to p*. The pump delivers a fixed flow rate Q_P independently of the pump outlet pressure. Find the flow rate through the orifice, Q_O, as well as the pump outlet pressure p_P, as a function of the orifice area opening, Ω. Describe also the function of the orifice, which can either be metering or compensator.

Given:

The pump flow rate, Q_P; the setting of the relief valve p*.

Find:

1 The flow rate through the orifice, QO

2 The pressure at pump outlet, pP

3 The orifice function (metering/compensator)