Class A—for high pressures ranging from 50 to 200 pounds.
„ B— „ low „ „ „ 20 to 80 „
and they are stamped accordingly.
They are adapted for any service requiring the lifting of water.
Class A is made for lifts up to 12 feet.
„ B „ „ „ 8 „
but if so ordered, they can be arranged for higher lifts. They may also be used as non-lifting injectors.
The temperatures of feed water taken by these injectors, if non-lifting or at a low lift, can be as follows:
| PRESSURE. | |||
|---|---|---|---|
| 35 to 45 | 50 to 85 | 90 | 105 lbs. |
| TEMPERATURE. | |||
| 144 to 136 | 133 to 130 | 129 | 122° F. |
| PRESSURE. | |||
| 120 | 135 | 150 lbs. | |
| TEMPERATURE. | |||
| 118 to 113 | 109 to 105 | 104 to 100° F. | |
The spindle acts as a valve for the steam inlet; an extra seam valve is therefore not absolutely required, but recommended for convenience of detachment.
The letters in Figs. [520]-[533], page 254, relate to the names of “the parts” of the Peerless injector.