GRINNELL REPORTS ON VALVES:
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THE ADVANTAGES OF
GRINNELL-SAUNDERS DIAPHRAGM VALVES IN
HIGH-VACUUM SERVICE .
Dependable
performance
for vacuums
down
rates of less than
and long service
to 0.7 micron . . . with 0.1 micron
One of the most important requirements of valves for high-vacuum service is that they must be vacuum-tight at all times during their operating cycle. D i a p h r a g m valves of the GrinnellSaunders manufacture fully meet this requirement. When clamped between the flanges of the body and bonnet, the
. . . .
life leak
cubic foot /hour
•
Large, unimpeded v a l v e passage
The large passage of the Grinnell valve, in the open position, offers minimum impedance to the escape of random moving molecules in pumping down to high-vacuum, thus shortening the pump-down cycle.
Rugged, nylon-reinforced d i a p h r a g m s in a v a r i e t y of m a t e r i a l s
Grinnell has perfected a method of reinforcing its diaphragms with wear-resistant nylon. The result is a diaphragm that lasts longer at highvacuum. The only part of the valve subject to service wear at any time is the diaphragm — which can easily be replaced in a matter of minutes, without removing the valve body from the system. Diaphragms are available in a wide choice of materials.
In open position, valve passage is free and unimpeded
Special provisions:
Sealed bonnets are available for evacuation when required. Elastomer type diaphragms do not require evacuation of the bonnet. Valves with plastic diaphragms, used at elevated temperatures, do require evacuation of the bonnet for long diaphragm service life. Rugged, reinforced nylon diaphragm gives long-lasting life Valve provides vacuum-tight seal in closed position
diaphragm is easily made vacuum-tight down to 0.1 micron — with an in-leakage rate of less than 0.1 micron cubic foot/hour. Whether in the open, throttling or closed position, the diaphragm presents a smooth, unbroken face to the vacuum side of the chamber.
Contamination minimized
Construction of Grinnell-Saunders Diaphragm Valves provides separation of the working mechanism from the vacuum within the system. This isolation of lubricated working parts prevents contamination of the system from lubricant outgassing.
For m o r e i n f o r m a t i o n
Get further facts about GrinnellSaunders Diaphragm Valves. Learn, how the diaphragm lifts high for streamline flow in either direction . . . and how the diaphragm seals firmly against the body weir for leak-tight closure. Write to: — Grinnell Company, Providence 1, Rhode Island.
Circle No. 16 on Readers' Service Card
VOL. 5 1 , N O . 9
·
SEPTEMBER 1959
35 A
