The role of safety valve in metering pump

It is well known that there are three valves in the structure of the metering pump, which are the safety valve, the air release valve and the oil supply valve, which are also called three-valve device or automatic compensation three-valve device by those in the industry. In the process of use, especially when there is a suction height requirement, this compensation device can only be used. Today I will focus on explaining the role of the safety valve in the metering pump.

The metering pump safety valve is also called the overflow valve. Safety valves generally exist in the following forms. Piston type safety valve, the valve core is a flat plate. The spring-type safety valve refers to the sealing of the valve disc and the valve seat by the force of the spring. The lever type safety valve relies on the force of a lever and a heavy hammer.

The safety valve of the metering pump is mainly to ensure that the pressure in the hydraulic chamber does not appear abnormal to protect the diaphragm. When the hydraulic oil in the hydraulic chamber exceeds the limit due to the replenishment, the diaphragm reaches the front limit plate and the cylinder plug has not yet reached the end of the discharge stroke, the cylindrical plug will still move forward, and the pressure in the hydraulic chamber will rise sharply. The safety valve should open quickly. At the same time, the safety valve of the metering pump can also protect the metering pump from damage when the pressure of the discharge pipeline rises abnormally. The opening pressure of the metering pump safety valve should be easily adjustable enough finely and accurately.