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A compound steam engine unit is a type of steam engine where steam is expanded in two or more stages. [1] [2] A typical arrangement for a compound engine is that the steam is first expanded in a high-pressure (HP) cylinder, then having given up heat and losing pressure, it exhausts directly into one or more larger-volume low-pressure (LP ...
These double-acting engines required the invention of the parallel motion, which allowed the piston rods of the individual cylinders to move in straight lines, keeping the piston true in the cylinder, while the walking beam end moved through an arc, somewhat analogous to a crosshead in later steam engines.
A double acting engine is an engine where steam is applied to both sides of the piston. Earlier steam engines applied steam in only one direction, allowing momentum or gravity to return the piston to its starting place, but a double acting engine uses steam to force the piston in both directions, thus increasing rotational speed and power. [50]
Typical horizontal steam engine with double-acting cylinder. A double-acting cylinder is a cylinder in which the working fluid acts alternately on both sides of the piston. . In order to connect the piston in a double-acting cylinder to an external mechanism, such as a crank shaft, a hole must be provided in one end of the cylinder for the piston rod, and this is fitted with a gland or ...
Double-acting horizontal stationary steam engine. The piston is on the left, the crank is mounted on the flywheel axle on the right. Mill engine, Queen Street Mill, Burnley. William Roberts horizontal tandem compound engine - 'Peace'. Marshall undertype steam engine
The engine was an ingenious three-crank tandem (or steeple) compound engine with three pairs of vertical single-acting cylinders arranged in such a way as to give a double-acting effect. Its sustained maximum power was 120 bhp (89 kW); peak power was 155 bhp (116 kW) but could not be held due to insufficient steam flow.
In the conventional double-acting engine, residual steam was trapped in the exhausting cylinder after the valve closed and compressed. This compressed steam has a cushioning effect and acts to brake the piston at the end of stroke. [ii] In the single-acting engine there is no similar effect at the end of the power stroke. This had previously ...
An oscillating cylinder engine cannot be reversed by means of the valve linkage (as in a normal fixed cylinder) because there is none. Reversing of the engine can be achieved by reversing the steam connections between inlet and exhaust or, in the case of small engines, by shifting the trunnion pivot point so that the port in the cylinder lines up with a different pair of ports in the port face.