| 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 DEG and 350 DEG 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 DEG and 350 DEG C. at temperatures between 210 DEG and 380 DEG C.
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