CHAPTER XXXVII.

=STEAM ENGINES.=

=Engine Cylinders= 372 to 374

The bores of 372

Sizes of 372

Wear of 372

Counterbore of 372

Clearance in 372

Lubrication of 373

The cocks of 373

Relief valves of 373

The steam ports of 373

Lagging 374

Jacketed cylinders 374

=Engine Pistons= 374

The speeds of 374

With releasing gears 374

With positive valve gears 374

The rings of 374

The follower 374

Testing the rings of 374

=Engine Piston Rods= 375

Methods of securing 375

Packing 375

Glands for 375

=Engine Cross Heads= 375

=Engine Guide Bars= 375

=Engine Connecting Rods= 375

Connecting rod keys 375

Angularity of 375

The lengths of 375

=Valves= 376 to 378

The D-valve 376

The point of cut off 376

Period of expansion of the steam 376

Point of release of the steam 376

Point of compression of the steam 376

Lead of 376

Point of admission of the steam 376

The lip 376

Exhaust lap 376

Steam lap 376

Tracing the action of 376

Double ported valves 377

The Allen valve 377

Webb's patent valve 377

Balanced valves 377

Circular valves 377

Piston valves 378

Separate cut off valves 378

Meyer's cut off valves 378

Gonzenback's cut off valve 378

=Eccentrics= 378

Shifting eccentrics 378

The action of 378

The angular advance of 378

=Designing Slide Valves= 380

=Valve Motions= 381

Diagram for designing 381

=Link Motion= 383

In full gear forward 383

In full gear backward 383

The action of 383

Setting the valves 383

=Governors= 384

Fly ball or throttling 384

Isochronal 384

Dancing 384

Speed of 384

Spring adjustment of 384

Sawyer's valve for 384

Speeder for 384

=Starting a Slide Valve Engine= 384

Crank position in 384

=Examination of an Engine= 385, 387

Adjusting connecting rod brasses 385

Adjusting main bearing 386

Taking a lead 386

Squaring a valve 386

Heating, to avoid 386

Setting a valve 386

Leaky throttle valves 386

Freezing an engine, prevention of 386, 387

=Pumps= 387, 388

Lift and force 387

Plunger 387

Rotary 387

Single-acting 387

Double-acting 387

Displacement of 387

Principles of action of 387, 388

Speed of 388

Capacity of 388

Air chamber of 388

Belt 388

Modern Machine-Shop Practice, Volumes I and II · 第 24 / 49 章