Leak-free clamping of a two section accumulator is accomplished by a flat metallic ring molded peripherally to the rubber flange of the bladder, and an inset rubber seal bonded to the face of the flange of each section. Method maintains constant torque on the clamping bolts

Schartau, G. M.

English

NASA Technical Reports Server

Accurr 
Flange 
September 1969
	 Brief 69-10355 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Sealing a Rubber Bladder Between Two Sections of an Accumulator 
Fig 1 Bladder Between Two Sections of Accumulator 
The problem: 
To develop a means for leak-free clamping of a 
rubber bladder between the flanges of a two-section 
accumulator, and maintenance of constant torque on 
the clamping bolts. 
The solution: 
A flat metallic ring molded peripherally to the rubber 
flange of the bladder, and an inset rubber seal bonded 
to the face of the flange of each section. 
How it ' s done: 
A groove is machined in the face of each flange of 
the accumulator, and a rubber seal is bonded in each 
groove (figs. I and 2). A flat metallic ring is bonded 
peripherally to the rubber flange of the bladder. As-
sembly of the three components leads to metal-to-
metal interfaces between the bladder and the two 
sections, with the ring compressing the opposed
-uI.iI 
.l!ITI IFT	
'1urTjr1• 
I: I:
	 •: II 
r(IJi Rub er Bladder Molded 
1 ,	 T Metallic Seiiiii 
Old Method Using Rubber Bladder
	 New Method Using Metallic Ring 
As Seal	 As Seal 
Fig 2 Assembly of Flanges 
rubber seals in the grooves. There is no relaxation in 
or leakage from the joint, and the bolts retain their 
original torque. 
Note: 
No further documentation is available. Inquiries 
may be directed to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B69-10355 
Patent status: 
No patent action is contemplated by NASA. 
Source: G. M. Schartau of 
International Business Machines, Incorporated 
under contract to 
Marshall Space Flight Center 
(M FS-20403) 
C ategory 05 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Sealing a rubber bladder between two sections of an accumulator

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