Functions of various valves in diaphragm metering pumps
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What are the functions of the Replenishing Valve, Vent Valve, and Relief Valve in a diaphragm metering pump?
The vent valve is likely the inlet/outlet valve. The replenishing valve is probably the one related to hydraulic performance. The relief valve is the pressure relief valve. These are my guesses based on the literal meanings; please correct me if I’m wrong
The Replenishing Valve is the oil filling valve, the Vent Valve is the exhaust valve, and the Relief Valve is the safety valve
Reply to 3# pydch: Well, could you explain what their specific functions are? Thank you very much
The Replenishing Valve is an oil replenishment valve; its function is to top up the hydraulic oil, as oil leaks occur with each cycle, and it is necessary for this valve to replenish the oil in order to ensure proper operation. The Vent Valve is an exhaust valve – gas accumulates in the hydraulic chamber over time, and if it is not removed, it can cause measurement errors; the vent valve is what allows these gases to be expelled automatically. A relief valve is a safety valve designed primarily to protect the diaphragm from being damaged. During improper operation, hydraulic pressure can rise to such levels that it may destroy the diaphragm; therefore, a safety valve is installed on every pump. It allows the hydraulic pressure to be released automatically when it exceeds the set threshold, thereby preventing damage to the diaphragm.
Reply to 5# pydch: Thank you so much! !
You’re welcome; I’m glad I could help.
What is the relationship between the set pressure of the safety valve and the pump outlet pressure?
The set value of the safety valve should be higher than the outlet pressure of the pump; if it is lower, backflow will occur continuously. To prevent pipeline blockage (as some materials tend to crystallize), continuous operation under such conditions can cause significant damage to the pump.