Fluid transformer utilizes fluid under pressure at one level to drive series of free pistons in positive displacement pump. Pump in turn delivers hydraulic fluid at different pressure level to a load. Transformer is constructed of corrosion resistant materials and is extremely light and compact in relation to capacity

Morando, J. A.

English

NASA Technical Reports Server

December 1970	 Brief 70-10595 
NASA TECH BRIEF 
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 National Technical Information Service, Springfield, 
Virginia 22151. Requests for individual copies or questions relating to the Tech Brief progam may be directed to the Tech-
nology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Efficient Pressure-Transformer for Fluids 
A new fluid transformer utilizes a fluid under 
pressure at one level to drive a series of free pistons in 
a positive displacement pump. The pump in turn de-
livers a hydraulic fluid at a different pressure level 
to a load (such as one or more hydraulic actuators 
or servomotors). The transformer is made of cor-
rosion-resistant materials and is extremely light and 
compact in relation to its capacity. 
A fuel-driven hydraulic motor drives a rotary-se-
lector control valve that guides fluid under pressure to 
a free piston positive displacement pump. The device 
sequentially moves a number of fairly large pistons 
whose movements are transmitted to a corresponding 
series of relatively small pistons; these small pistons 
deliver the relatively high pressure hydraulic fluid 
output of the transformer against the ultimate load. 
With a free piston pump, the requirement for 
conventional rotating cylinder blocks, heavy thrust 
bearings, and shaft seals is avoided. Normal problems 
of efficiency, weight, size and complexity are essen-
tially eliminated, and an extremely efficient, simple, 
and light weight construction is achieved. 
While initially designed for use as a pressure booster 
or intensifier, this transformer can also be used as a 
pressure de-intensifier and flow booster in which 
pistons of smaller diameter are acted upon by drive 
fluid to drive larger diameter pistons which generate
lower pressure and higher flow in the pump fluid than 
in that of the driving fluid. 
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
Marshall Space Flight Center 
Code A&TS-TU 
Huntsville, Alabama 35812 
Reference: TSP70- 10595 
Patent status: 
This invention has been patented by NASA (U.S. 
Patent No. 3,262,395), and royalty-free license rights 
will be granted for its commercial development. 
Inquiries about obtaining a license should be ad-
dressed to: 
Patent Counsel 
Mail Code A&TS-PAT 
George C. Marshall Space Flight Center 
Marshall Space Flight Center, Alabama 35812 
Source: J. A. Morando of 
Crane Company 
under contract to 
Marshall Space Flight Center 
(MFS-20830) 
Category 07 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United 'States
	 will be free from privately owned rights.
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Efficient pressure-transformer for fluids

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