Question

90. Consider the following hydraulic system. Op OPRY Pz Oneedle valve Assume the flow rate out of pump is 0.002 m3/s, the needle valve is closed, and the pressure relief valve is set to 7.5 MPag, and both gages measure gage pressure a. What is the pressure p? b. What is ?

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Answer #1

Given fixed displacement pump therefore flow rate Qp of pump is constant.Here pressure relief Valve sets the required pressure P1 by delivering Qcyl into cylinder and the remaining pressre will be delivered into tank by flow Qprv. Here Qp =Qcyl +Qprv

When the pump is switched on. The actual pump flow Qp is goes into cylinder

a)At this stage p1 will be 0 Mpag and starts to raise

b)At this stage Qcyl is 0.002 m3

when needle valve is closed

a)At this stage p1 is 7.5 Mpag which pressure is set in pressure relief valve

b)At this stage Qcyl is 0 m3 (as required pressure is attained and flow (Qp) from pump flows into Pressure Relief Valve as Qprv)

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90. Consider the following hydraulic system. Op OPRY Pz Oneedle valve Assume the flow rate out...
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