Sailoday, you've opened my eyes saying hammer is connected with closing time, many thanks :)
hammer happens only then valve closed while fluid is moving
so i think i've used the term "hydraulic shock" incorrectly
sorry for mislead
seems i need to somehow describe the problem
i have a pump and...
thanks for advice, Calfersoporte
you've mentioned very important parameters but for now i'm rather looking for specific types of valves than specific models
i've checked ASCO's 8290 but they seem not a "constant volume" valves
this property is the main property i'm looking for
thanks again
i'm looking for a valve that doesn't change the volume of the system on activation (i.e. which prevents hydraulic shock), can be operated remotely and has short activation time
i'd use ball valves but their pressure/temperature charts are unsuitable
also i've heard of some kind of piston valve...
