Process and apparatus for pumping and metering a liquid product with a melting point between 200 and 350 degrees C.

摘要

The invention relates to a process and apparatus for the pumping and metering of liquid products, wherein the melting point is between 200. degree. and 350° C. In the process, a pulsation generator with piston and diaphragm displaces a thermal fluid which actuates a pumping apparatus, and the fluid transmits its pulsations to a molten tin alloy or tin bath contained in a siphon, the bath in turn transmitting the pulsations to part of the liquid product to be displaced and which is contained in a conduit connecting the siphon to a diaphragm- free pumping head, between the suction valve and delivery valve of the said pumping head, which makes the latter operate in suction and delivery with respect to the same product between suction pipe and delivery pipe. The process and apparatus are particularly applicable to the pumping of melted salts with a melting point between 200° and 350° C. at temperatures between 210° and 380° C.