Water or Hydraulic Motors (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ...but not so with water, it being non-expansive, and slow and steady in its flow. With water-pressure engines it is imperative to have the auxiliary valve to get anything like a reasonable piston speed. The essential features in a good direct-acting reciprocating water-pressure engine are: --Large pressure ports. Few joints, levers, links, and pins in the valve gear. Great strength in the levers and rods to prevent any springing and back lash, which retards the reversal of the piston at the end of each stroke; hence slow piston speeds and large heavy engines. Joy's Engine. This engine was originally invented for the purpose of blowing church organs, but it was not long before it made its appearance in collieries in the shape of pumping engines for draining the dip-workings. This gear is illustrated in sectional elevation Fig. 94, and cross-section Fig. 95. A is the water-pressure cylinder, with ports similar to an ordinary steam-engine cylinder, B and B being the inletports, and C the exhaust port. D is an ordinary slidevalve of the D type, working over the face of the three ports, and actuated by its attachment to the valve moving pistons E and E, working in the two small cylinders in the ends of the valve-box or chest G. H is the inlet-pipe for the pressure water. The pistons E and E are moved by the water-pressure, which is let into and out of their cylinders alternately by the small four-way cock I; this four-way cock being actuated by a lever J and a rod K, which is attached to an arm on the piston-rod; this rod is fitted with a set of adjustable tappets for regulating the action of the four-way cock I. The peculiarity of this arrangement of gear, for water-pressure engines, being a motion of the valve, which can be regulated as to...