Tell us about the pump and how it is plumbed.
In general you should never restrict the suction or inlet sie of a pump in any way, if its submerged try to leave the suction side free of any valves, fittings or sponges.
If it is external use the largest plumbing possible, keep it short and straight if you can so no restrictions. A valve can be added for maintenance but should remain fully open at all times when in operation.
It is safe and often wise to add a ball or gate valve to the discharge side of a pump to throttle flows back or fine tune the overflow and return rates. Again its wise to oversize the plumbing at least one size as it reduces head loss and lowers velocity.
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