know about valve

"what types of vale is used in low flow rate , where pressure loss is not matter"

For what purpose? Different valves are used for different purposes, so without details, your question cannot be answered.

what are the essential detail ur required for selecting the valves, describe it?

Function, flow, pressure, fluid type, essentially the same details as selecting a pipe.

All pipes, and fittings including valves, present a loss of pressure to flow, as the materials they are made from present friction to the flow.

<...where pressure loss is not matter...>

Pressure drop is a primary consideration in the design of any piping system, as it enables the system to be correctly sized on the balance between investment and operating cost.

VALVE?

NEEDLE type!

If your after good control (and not worried about pressure drop) use a small one!