AN AUTOMATIC VALVE FOR A SIPHON CLYDEW. TOTTEN UNIVBRSITY PREPARATORY COLLEGE AND JUNIOR COLLEGE, TONKAWA, OKLAHOMA
Did you ever start a siphon on a sulfuric acid carboy running into a dispensing bottle, then be called away "just a minute," only to return and find the bottle overflowing and a lake of acid to clean up? If so, you will appreciate this simple addition to a siphon which can be used on a reagent carboy to deliver the liquid to a desired depth in the dispensing bottle. The time you will save in not being compelled to watch and wait for bottles to fill from a slowly trickling siphon will more than repay you for its installation. Description The large tube (JL) siphons the liquid from the carboy to thedispensing bottle. The air tube (FK) connects the air cavity above the surface of the liquid in I I 1111 the carboy with a point an 1 inch below the desired liquid level in the dispensing bottle. A loop of rubber tubing (G) permits (K) to be adjusted to the depth of liquid desired in various sizes of bottles. The air tube is held against the siphon by means of rubber bauds a t (H) and (I). A "T" tube (B) affords a branch of the air tube leading to the mouthpiece (D). Pinchcocks (A, C, and E) complete the assembly.
1
A
Operation Start the siphon by closing (E), opening (C) and (A), and applying air pressure a t (D). When the siphon is once completely filled, (C) can be kept closed and (E) always open. The slight constriction a t (L) keeps the siphon full and ready to flow whenever (A) is opened. The siphon flows until the level of the liquid in the bottle rises to (K). Then the vacuum created in the carboy by the siphon draws the liquid up into the air tube until the head of liquid balances the vacuum. Then the siphon stops automatically. Incidentally, if the liquid level should for some reason fall below (K), the siphon will flow and stop as before. 1831
