Hot-water generator
With no warm up or idle time, and no energy losses through steam conversion or within a heat exchanger, a maximum of the fuel's energy is transferred to the water.
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Using 30-40% less fuel than a boiler, the Direct Fire Technology unit produces potable hot water within 20 seconds of starting.
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Cold water introduced through a patent-pending series of calibrated nozzles in the top of the unit travels downward through a bed of stainless- steel packing rings. A top-mounted burner fires downward through a centrally located flame tube that contains all of the fuel gasses. The design allows all combustion to take place within a dry and cool environment, producing very low levels of nitrous oxide and carbon monoxide. Heat produced from the flame enters the lower chamber, travels upward through the packing rings, and a "rain" of hot water falls into the lower chamber where it is pumped out to a storage tank.
A valve controlling the incoming water flow provides outlet water temperatures between 130 and 185F. More flow results in cooler outlet water, and less produces hotter outlet water. The products of combustion are exhausted out of the top of the unit, and are normally 80 to 100F so that CPVC can be used for the exhaust venting.
Jay Baker, Direct Fire Technical Inc., 2836 S.E. Loop 820, Fort Worth, TX 76140; Tel: (817) 568-8778; Fax: (817) 568-8784; E-mail: jackgn1@airmail.net
Telescoping
linear bearings
Unlike ordinary drawer slides, the Telescopic Rail minimizes deflection under heavy loads and provides reliability under continuous operation. Made from cold drawn bearing steel, rather than bent sheet metal, the slides use ball-cage technology and hardened raceways that guarantee smooth, quiet movement even with heavy loads.
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Compact and strong with extremely low defelction, the Telescopic Rail is designed for industrial use.
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Designed to fit into tight spaces, this family of slides allows engineers to resolve various applications involving loads that extend out into overhanging positions, when mounting space is limited. Design engineers can use a range of slide types to realize an original solution for each application.
Andrew Cook, Rollon Corp., 532 Route 15, Sparta, NJ 07871; Tel: (973) 579-3400; Fax: (973) 579-3222.
Prox
extender
The proximity-switch actuator "artificially" yet effectively increases the prox range by inches in limited-space and hazardous-environment applications. Users save money by purchasing a smaller, less-expensive prox.
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Combined with the corresponding mounting clamp, the detent holder fits inductive proximity switches having a 4- or 8-mm diameter.
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The threaded stainless-steel actuator mounts such that the extended end of its spring-loaded plunger comes in contact with the target. The other end mounts in an aluminum housing along with a small prox sensor.
When the spring-loaded plunger contacts the target, the plunger is pushed back and the inductive prox detects its opposite end. The switching point between prox and actuator pin can be set as desired.
Craig Brandenburg, Balluff Inc., 8125 Holton Dr., Florence, KY 41042; Tel: (606) 727-2200 ext. 3285; E-mail: cbrandenburg@ balluff.com.
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