Bench test: Check valve

[Elb.ab]

Hello.
I'm working on a bench test to test check valves. My first idea was to connect the pump directly to the check valve. But this doesn't seem a good idea seeing that i want be able to control the flow ( the pump will continue turning until the pressure reches the value to which the check valve opens.).
I lookied in some example. I find that they add a back pressure valve at the end ( on the picture, I put "Valve")?
Can you please give me some idea concerning why it is good to put a back pressure valve? or some suggestions to test my check valves.
Thank you in advance.

http://files.engineering.com/getfil...8d-4d9d-a827-de4302d71e29&file=Sans_titre.png

 

[Danlap]

Hi,

If I were you, suggest to put the back pressure valve as close as possible to the pump discharge outlet. And not sure what is the role of the Ball check valve in the middle, I think it will remain close and potentially built dirt from the water you will used.

General rule of thumb of check valve is they have the biggest leakage rate shall compared to other valve, it is in the range of Class B to Class F shall you refer it to ISO 5208. Having said that, you are planning to install the pressure gauge/reader near the check valve. If its digital, almost for sure you will see noticeable pressure drop. And shall witnessed by valve expert/end user, ones cannot use the term pressure equalization or thermal expansion all the time
Back pressure valve even though not entirely bubble tight, installed in series might do the trick.

Regards,
MR

All valves will last for years, except the ones that were poorly manufactured; are still wrongly operated and or were wrongly selected