Table.
| NUMBER OF TEST. | No. 1. | No. 2. | No. 3. | No. 4. |
|---|---|---|---|---|
| Steam pressure—high steam cylinder | 70 lbs. | 120 lbs. | 125 lbs. | — |
| Steam pressure—low steam cylinder | 20 lbs. | 40 lbs. | 45 lbs. | 50 lbs. |
| Vacuum in condenser | 271⁄2in. | 27in. | 261⁄4in. | 25in. |
| Double strokes per minute—high side | 37 | 61 | 82 | — |
| Double strokes per minute—low side | 35 | 60 | 82 | 88 |
| Temperature of hot well—Fahrenheit | 106 deg. | 105 deg. | 108 deg. | 112 deg. |
| Water pumped per hour—high side | 13,500 lbs. | 22,700 lbs. | 30,000 lbs. | — |
| Water pumped per hour—low side | 12,700 lbs. | 22,300 lbs. | 30,200 lbs. | 36,000 lbs. |
| Total water per hour | 26,200 lbs. | 45,000 lbs. | 60,200 lbs. | — |
| I. H. P. of high steam cylinder | 0.60 | — | — | — |
| I. H. P. of low steam cylinder | 0.58 | — | — | — |
| Total I. H. P. | 1.18 | — | — | — |
Fig. 350.
The Deane Vacuum Pump. There are a number of novel features exhibited in the construction of this pump; the cylinder has four ports, that is to say two steam or admission ports and two compression or cushioning ports.
Referring to the engraving, page 42, Fig. [6], shows the main valve to be a plain D slide,—directly under it the same valve is shown in section. The projection on the back of this valve fits into the valve piston. The secondary valve, 5, surrounds the main valve and contains two plain slide valves, one on each side. Referring to 3, it will be noted that one of these valves admits steam while the other allows the steam to escape after having done its work of moving the valve piston.
A longitudinal section of this secondary valve and steam cylinder are shown, in 2.
In the engraving, 1, it is shown that the cylinder for each end of the valve piston is jacketed with live steam so that the cylinder itself heats up as quickly as the valve piston, hence the piston cannot stick in the cylinder due to unequal expansion of valve and seat.