Combination metering valve for low or high viscosity liquids - passes liquid through chamber containing valve needle whose movement is controlled by its pressure and which is attached to a diaphragm

摘要

A metering valve for low to high viscosity liquids has a needle moved inside a pressure chamber through which the liquid flows, the movement being related to the pressure of the liquid; the one end of the needle is attached to a diaphragm whose other side rests against an axially moving guide moved by the pressure of a control medium; the other end of the valve needle is pointed and enters a valve opening in the pressure chamber, and the valve is operated in circulating the liquid as a "shot" or recirculation type valve. It is designed as a combination valve, with both the "shot" valve and recirculation valve housed in one enclosure, their pressure chambers being connected through one common chamber. ADVANTAGE - The construction integrates together two pressure-regulated metering valves in one single casing. It has low losses. The two types of valve combined are the "shot" and recirculation types.