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transient_hammer analysis inquiry

while i run analysis for water hammer protection on Hammer V8i i used a surge valve to anticipate the vapor volume and the pressure transient

but when i added two surge valve parallel refering as a practical example here in our region pump station i have got a negative pressure 

is this the right way to simulate more than surge valve connected together or it dosent worth to install many of them and one is enough like the model has resulted ?

thank you all