Screw activated device, consisting of a compressor, shielded replaceable ampules, a multiple-element rubber gland, and a specially constructed fluid line fitting, injects measured amounts of fluids into a pressurized system. It is sturdy and easily manipulated

Copeland, E. J.

Ward, J. B.

English

NASA Technical Reports Server

Inject
Ing 
June 1970
	
Brief 70-10307 
NASA TECH BRIEF	 , EN^A-
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage commercial 
application. Tech Briefs are available on a subscription basis from the Clearinghouse for Federal Scientific and Technical 
Information, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Fluid Injection Device for High-Pressure Systems 
Casing Assembly
Injector Assembly 
A screw-activated compressor device is proposed 
for the injection of measured amounts of fluids into 
a pressurized system. The device consists of a com-
pressor, shielded replaceable ampules, a multiple-
element rubber gland, and a specially constructed 
fluid line fitting. 
The outer shell of the ampule consists of a rigid 
plastic bottle with a threaded cap. A thin-walled 
inner bag, made of sprayed-on layers of plastic for 
low permeability, empties by movement of a rigid 
base bonded to the bottom of the bag. Force applied 
at the center of the base by a spherical-ended piston
expands the diameter of the base and causes its sharp 
edge to wipe the shell's inner diameter. As the ampule 
is emptied, the thin bag is prevented from extruding 
past the base by the applied force. The rubber gland 
in the cap contains three . knife-slotted, silicone-rubber 
washers to allow a needle to penetrate the ampule and 
to provide a seal when the needle is removed. 
A special fitting on the fluid system provides an 
access port and gives threaded support for the injector 
while the injection takes place. The fitting has a gland 
similar to that of the ampule except that it has four 
silicone-rubber washers with knife slots. Two washers (continued overleaf) 
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form a gland while the other two constitute a redun-
dant gland. 
The injector needle assembly is essentially an 
adapter which connects to the panel fitting and pro-
vides bayonet slots to engage the injector casing. A 
blunt needle from this assembly penetrates one-half 
of the water-panel fitting gland depth when screwed 
onto the panel fitting. The gland prevents flow from 
the water system through the needle prior to insertion 
of the injector assembly. As the bayonet connection 
is made, the other end of the needle penetrates the 
ampule gland completely and the needle assembly is 
forced against a compression spring by the injector. 
This causes the assembly to pass through the panel 
fitting gland and establish a flow path from the ampule 
to the water system.
This innovation provides a sturdy, easily manipu-
lated fluid injection device which may be of interest 
to the chemical and food-processing industries, and 
particularly to the dairy industry. 
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
Manned Spacecraft Center, Code BM7 
Houston, Texas 77058 
Reference: B70-10307 
Patent status: 
No patent action is contemplated by NASA. 
Source: J. B. Ward and E. J. Copeland of 
North American Rockwell Corporation 
under contract to 
Manned Spacecraft Center 
(MSC-15635) 
Brief 70-10307	 Category 06


Fluid injection device for high-pressure systems

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