Dear Sir,
Here in this model, The Valve closing time is 45 s (linear in nature). The pressure at the pump discharge is as high as 450 m of H2O ( despite having hydro pneumatic tank). The valve opening tine of 45 s is selected considering the valve closing time (Equal valve opening & closing time) to arrest the surge pressure within the acceptable limit due to tripping.
Please ascertain the reason for such high pressure. The model is attached for your reference.
Regards,
Sujoy De
model 11-06-2016.rar