Chapter LI: Section 58: PACKINGS, JOINTS, STUFFING BOXES, &c

PISTONS.

=1089. Piston with junk ring;= the packing is sometimes cast iron, steel, brass, or phosphor bronze rings, or even hemp or asbestos.

=1090. Small pistons= have generally two rings of steel or brass sprung into the grooves.

=1091. Double-acting hydraulic piston= for _cold_ water; if single acting, one leather only is required; for _hot_ water, rings are generally employed.

=1092. Indiarubber rolling ring packing,= used on Kennedy’s patent piston water meters.

=1093. Piston,= with junk ring for fibrous packing.

Numerous patents are in use for springs of various kinds applied to
piston rings. See Section 80.

STUFFING BOXES, &c.

=1094, 1095, 1096, & 1097. Sections and plans of gland stuffing boxes.=

=1098. Leather packing ring or collar,= used generally for higher pressures up to 3 or 4 tons per square inch.

=1099. Stuffing box for hydraulic rams,= up to pressures of about 1000 lbs. per square inch, with special hard packing.

=1100 & 1101. When the wear on an hydraulic leather is considerable a guard-ring should be added,= as shown here.

=1102. Stannah’s patent stuffing box;= the packing is tightened by a set screw.

=1103 & 1104. Ram leathers,= with gland to facilitate renewing.

=1105. Grooved steam packing.= It is said that the steam will not readily pass a series of grooves round a piston rod.

=1106. Useful form of gland= for a screwed spindle, the thread being cut in the outer cap.

=1107. ~V~-ring piston packing rings.= The inner spring ring presses the outer rings out against the cylinder.

=1108. “Bottle” gland= to cover a reciprocating rod end.

=1109. Gland= with oil space to keep the rod lubricated.

=1110. Water lute or seal= for gas holders, &c.

=1111. Grooved joint= for packing round covers, &c.

=1112. Indiarubber sheet joint= for the tubes of condensers, the rubber being pressed around the tube joints by a plate with projecting rings. See Plate, page 139.

=1113. ~V~-ring metallic gland packing.= See Plate, page 139.

Joints of plane surfaces are usually made with red-lead for steam and
water; asbestos, millboard, and sometimes rubber insertion, tape,
paper, or wire gauze for steam, water, air, &c.