A check valve allows for flow in one direction and a gate valve is used for positive shut off and a globe valve is used for throttling
i believe the reflux valve is just a type of check valve, the flapper type.
There is no difference between check valve and NRV, both are same
A dual check valve is similar to a double check valve in that it is a mechanical backflow preventer consisting of two independently acting, spring-loaded check valve.
None whatsoever.
I believe that servo is motorized and solenoid is magnetically activated.
no you cant
They are just about the same
XV is shutoff valve UV is under control valve
since check valve holds water in the line can a hand pump be installed between the check valve and water tank?
You can check the valve clearance with a valve clearance guide. Slide the guide between the valve. The guide will register the clearance.
The term cock and valve are used interchangeably in the English language. The term cock has in large been replaced with valve with no functional difference between the two.
In short, More Power.
The intake valve is bigger.