Reliable vacuum and vacu-vapor heating equipment (1915)
The Bishop-Babcock-Becker Co. · The Bishop-Babcock-Becker Co. · leaf 72
Top view % inch size Sixty-Eight HEATING EQUIPMENT … 1, 1}4 and l}4 inch sizes valves. This means the Vacu-Graduate Valve isself-cleaning. The Vacu-Graduate Valve is made packless byseat above the valve stem, which is always heldtightly in place by an extra large, heavy spring.This spring also maintains a tight seating of thevalve, so it cannot leak.…
Heating units · Vacuum-tube collectors · HVAC ducts and casings
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