NH3 Liquid pumps

[Gaz r]

What is the purpose of a Q,min and Q,max orifice plate on a liquid ammonia pump?

[Pooh]

This is to control the minimum and maximum flow rate of the pump to allow optimum heat transfer, I think.

ian

[John Hunter]

The q min is to ensure proper cooling of the motor and for general lubrication of the pump parts. The q max is an overload preventor.

[US Iceman]

See page 4 of the document from this link:

http://hantech.com/documents/PDF/HP237.pdf

Hope that clears up the questions.

[Sergei]

Minimum flow for cooling the electrical motor or for cooling the mechanical seal. Maximum flow for pump prime. At high flow the pump can loose prime.