Management of dairy plants . action; namely, thesubjection of the ammonia gas to the pressure necessary forliquefaction. The condenser takes care of the second factor;namely, the removal ofheat and the resultantcondensation to liquidform. We distinguish be-tween two forms of com-pressors — the Single-Acting and theDouble-Acting. Thesingle-acting compressoris always of vertical con-struction; the double-acting is most commonlyhorizontal, although afew of them are of thevertical type. I. Single-Acting Com-pressor. — Fig. 16 rep-resents the compressorcylinder of a single-act-ing compressor. Thega
Management of dairy plants . action; namely, thesubjection of the ammonia gas to the pressure necessary forliquefaction. The condenser takes care of the second factor;namely, the removal ofheat and the resultantcondensation to liquidform. We distinguish be-tween two forms of com-pressors — the Single-Acting and theDouble-Acting. Thesingle-acting compressoris always of vertical con-struction; the double-acting is most commonlyhorizontal, although afew of them are of thevertical type. I. Single-Acting Com-pressor. — Fig. 16 rep-resents the compressorcylinder of a single-act-ing compressor. Thegas enters at the bottomof the cylinder, passesup through the suctionvalve in the piston, andby the up stroke of thepiston is compressed anddriven out through thedischarge valve in thecenter of the safety head. The piston and the bottom of thesafety head, each being faced off square and coming in contact,allow a complete discharge of the gas. The compressor of thistype is incased in a water jacket. The water keeps the com-. FiG. 17. — Vilter double-acting ammoniacompressor. 76 MANAGEMENT OF DAIRY PLANTS pressor walls cool and thus removes a portion of the heat inthe ammonia. 2. Double-Acting Compressor. — Fig. 17 represents the com-pressor cylinder of a double-acting compressor. This cylinder hasboth a suction and a discharge valve in each end of the cylinder,and while the gas is being discharged from one end of thecylinder the other end is being filled with gas at suctionpressure. 3. Advantages of Each Type of Compressor. —The principaladvantages and disadvantages of each type of compressor havebeen considered by F. Newkirk,i as follows: The single-acting machine has a simpler stuffing box for thereason that it is not subjected to high pressure as in case of thedouble-acting machine. The double-acting machine has a deepstuffing box which must be kept very tight in order to preventloss of ammonia. This causes much friction on the piston rodand requires more oil. This, i
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdairyin, bookyear1921
