1. Why is an expander required on the discharge side of a pump?
2. Why is the nonreturn valve (NRV) installed before the control valve in the pump discharge line? What will happen if we put the NRV after the control valve?
3. If we use an automatically operated valve in the pump discharge line, do we still have to install a NRV?
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Re: Why is an expander required on the discharge side of a pump?
12 July 2010 at 1:29pmI would suggest the following answers to your questions.
1. The pipe size needs to be increased from the pump discharge to slow down the velocity of the output and thus reduce the friction losses.
2. As the discharge valve is the pump isolating valve for maintenance purposes, when the NRV is located between the pump and the isolating valve, it too can be maintained.
3. An automatic valve cannot always stop reverse flow through the pump.
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