Re: discharge valve of pumps

From: <Geoff>
Date: Mon Oct 17 2005 - 17:30:00 EDT

Hi,

The discharge valve is normally open if the pump is fitted with a check valve.

The reason is that the discharge valve is there to isolate the pump for manitenance. There are some authorities in the water industry who start pumps against a closed valve to limit the starting current of the pump. ie no flow no load. The problem with this is that the valves usuallly emoloyed for this service are generally not designed for throttling duty. They are usually gate, sluice or ball valves.

The use of an interlock has merit if the discharge valve is automated and is used as a check valve.

Geoff Stone

VIJAYAN PULIKKATH <vijpulikkath@yahoo.com> wrote: From: Vijayan Pulikkath
Location: Consultants, Chennai, India
Asst Design Engr

1. Which is the natural position for a discharge valve of a pump when the pump is started?

    valve open
    valve closed
2) Reason?

3) Is it normal to have an interlock for pump start/stop with the discharge valve when they are operating in parallel and on auto standby? Is it essential?

Vijayan

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[Non-text portions of this message have been removed] Received on Mon Oct 17 17:30:00 2005