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HOKE R E P O R T S ON FLUID C O N T R O L ( 2 )
WE PACKED PERFORMANCE IN A PACKLESS VALVE The development of packless valves has so greatly reduced the problems of handling high pressures, temperatures and vacuums, and dangerous fluids that engineers designing such systems can now spend more time curled up with the Hoke Corrosion Chart.* With this extra time, many have dreamed up weird applications for the Hoke 440 Series bellows seal valve, trying to snare us in our own semantics. In a rash moment, we boasted that this valve could be modified for almost any application. Actually, the 440 can be modified to work at high pressures (up to 2000 psi), for high temp e r a t u r e s ( u p to 1000T.), and for special connections such as tubing, socket welding, and silver brazing. > Aside from this hornblowing, here are the dry facts. The basic design includes a stainless steel body, inert arcwelded bellows assembly, Teflon gaskets and Teflon stem point discs. This is only the starting point. Minor modifications make so many models available that almost any problem, inThe cesium boiler shown above uses a modified cluding liquid metal version of the Hoke 440 handling, can be solved. series bellows seal valve. Hear what a disbeliever said : "I did not believe that the modified valves would satisfy all my requirements, especially to keep a high vacuum of the order of 10"5 mmHg under a wide variation of temperatures; however, I now acknowledge that the modified Hoke 440 valves fulfilled their duty perfectly." This came from The Martin Company, where we sent 440's for use in cesium vapor up to 400°F. Special modifications made these valves readily usable on a cesium boiler and converted an infidel to the true valve. If you work with critical high vacuum, high pressures, high temperatures and dangerous fluids, proceed with care. Ask for our Packless Valve Bulletin to reap a harvest of engineering plums. *Makes good reading if you're handling corrosive agents. Write, and we'll send you one.
FREE! A STEADY FLOW OF FACTS!
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$7.05 for a Laboratory Grade Burette, 10 ml., K-35178 Not illustrated—$14.80 for a Separatory Funnel with Teflon Stopcock, 125 ml., K-63353
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Further flow features, and interesting technical topics are carefully covered in Hoke's technical publication, the FLOW SHEET. It's free, but worth millions !
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