HPL feed to Accumulator hammer

[NH3LVR]

Is it possible that the HE Valve was removed when the new Solenoid valve was installed?
Shut off valves are not good at regulating flow.
The other issue is that the seat in a shut off valve will erode if you use it as a regulating valve. The HE valve will erode as well but that is not an problem as you do not use it as a positive shut off.
Not having a leak tight valve makes it very difficult to service the solenoid.

[Segei]

Is it possible that the HE Valve was removed when the new Solenoid valve was installed?
Shut off valves are not good at regulating flow.
The other issue is that the seat in a shut off valve will erode if you use it as a regulating valve. The HE valve will erode as well but that is not an problem as you do not use it as a positive shut off.
Not having a leak tight valve makes it very difficult to service the solenoid.

Eroding of HEV or shut off valve depends of pressure drop across the valve and operating time. HEV have pressure drop 100 psig and after several years of operation it can erode. Slightly open shut off valve has pressure drop 10-20 psig and no eroding at this pressure drop. Yes, it has significant pressure drop when solenoid open but this only for fraction of second. Know 2 plants which throttle shut off valves for more than 20 years and no problem to replace solenoid. Imagine, that seat of shut off valve was eroded. Valve can be replaced by closing outlet valve of HPR.