Modern Pumping and Hydraulic Machinery as Applied to All Purposes: With Explanation of the Theoretical Principles Involved, Construction, Working, and Relative Advantages. Being a Practical Handbook for Engineers, Designers and Others
Modern Pumping and Hydraulic Machinery as Applied to All Purposes: With Explanation of the Theoretical Principles Involved, Construction, Working, and Relative Advantages. Being a Practical Handbook for Engineers, Designers and Others
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...extension A of Fig. I(51.--Caird and Rayner's Double-acting Air Pumps constructed without Foot cr Bucket Valves on the Zylberlast System. the plunger passes up between the barrel head C and the upper end of the liner B, an air-tight fit being maintained by accurately-machined and truly aligned n i__ parts, assisted by ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...extension A of Fig. I(51.--Caird and Rayner's Double-acting Air Pumps constructed without Foot cr Bucket Valves on the Zylberlast System. the plunger passes up between the barrel head C and the upper end of the liner B, an air-tight fit being maintained by accurately-machined and truly aligned n i__ parts, assisted by water rings in the head piston C, besides which the fit between B and C is sealed on both sides of A by the water in the well J. The principal advantage of this pump is due to its great volumetric capacity, which, it will be noted, is equal to the total sweep of the plunger on both sides, while only occupying a trifling additional head room to that required by a single-acting pump. From the foregoing it will be noted that, although foot valves have been eliminated from several single-stage vacuum pumps, head valves are retained as a necessity in both single and double-stage pumps. The Heisler pump, illustrated by Fig. 162, probably approaches as near to the ideal as any other using valves; in this pump only one valve (v) of the full diameter of the plunger is used, and this being strung over the pump-rod, is in part mechanically opened and closed, and firmly guided on to its seat, consisting of an inset ring of rubber composition. This pump, as will be recognised, is constructed to operate on the Edwards dynamic principle, but differs from other vacuum pumps of this type in being formed with a deflecting hood (A) to guide the water displaced by the plunger (p) from the base to enter the pump barrel above, through the ports (t), which action, as before explained, has the effect of entrapping the air during that part of the upward movement of the plunger required to close the ports, in addition to a slight exhausting effect caused by the inflow ...
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