FORTNIGHTLY BOATSHOP PHOTO LOG
















Understanding Injectors










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UNDERSTANDING INJECTORS seems to be a black or white situation.  Some steamers swear by injectors, as the most convenient and efficient means of filling a boiler under pressure, while others just swear at their injectors.













The amount of text and  drawings  that we will present here will run into several pages hence will continue from issue to issue.  You are invited to print out any or all of the issues so that you may have a complete, easy to read text for your own use.















OPERATING
PRINCIPLE
of Penberthy
Automatic Injectors:



















Above to Left:  When steam supply valve is opened, steam passes through steam jet into suction chamber, proceeds through suction jet and out of the overflow.  Steam, which attains a velocity of approximately 2500 ft per second as it leaves the steam jet, entrains the air in suction chamber and creates a vacuum.



To Left:  The vacuum created in suction chamber begins to draw in water from supply line.  The water is now entrained by the steam and a high velocity mixture of water and steam passes through the suction jet and out of the overflow.
















To Left:  When the amount of steam and water reach the proper proportion, the steam gradually condenses as the mixture advances through injector.  Upon reaching delivery jet parallel the mixture is fully condensed.

Below:  The energy contained in the water passing through delivery jet is sufficient to build up a pressure, greater than the boiler pressure, causing water to flow through the discharge check valve into the boiler.  When flow into the boiler is established the overflow valve closes automatically and prevents the entrance of air which would disrupt operation of injector.  Total operating cycle requires only a few seconds.
























Move to other Injector Pages
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UNDERSTANDING INJECTORS
INSTALLATION - OPERATION
INJECTOR PERFORMANCE
INJECTOR REPAIR PARTS
INJECTOR PRICES














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