Electronic circuit connected to solenoid valve coils visually indicates the position of the valve stem. Transient suppression is provided to prevent damaging voltage spikes

Fischer, R.

Frye, R. J.

Wimmer, H. L.

English

NASA Technical Reports Server

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April 1970	 Brief 70-10174 
NASA TECH BRIEF 
NASA Teèh 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. 
Electronic Position Indicator for Latching Solenoid Valves 
Detecting Circuit For Double-Latching Solenoid Valve 
The problem: 
To determine whether a double latching solenoid 
valve is open, closed, or at some in-between position. 
The solution: 
An electronic circuit connected to the solenoid 
valve coils which visually indicates the position of 
the valve stem. 
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
How it's done: 
The circuit shown in the figure detects the change 
in impedance of a solenoid coil caused by the change 
in position of the solenoid plunger with respect to 
the coil. This change in impedance of the coil un-
balances a bridge and thus provides a signal for the 
level ,
 detection circuitry. Identical detection circuits 
are connected to the valve coils so that if the valve is 
(continued overleaf) 
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.
https://ntrs.nasa.gov/search.jsp?R=19700000168 2020-03-17T00:29:35+00:00Z
not fully open or fully closed, neither detection lamp 
will be on. 
Transient suppression has been provided to prevent 
damaging voltage spikes. No modifications of the 
valve are required since the detector is connected 
directly to the valve coil. 
Notes: 
1. This indicator can be used with completely seald 
double-latching valve assemblies. 
2. The following documentation may be obtained 
from:
Clearinghouse for Federal Scientific 
and Technical Information 
Springfield, Virginia 22151 
Single document price $3.00 
(or microfiche $0.65) 
Reference: NASA-TM-X- 1760 (N69-20874); 
Electronic Position Indicator for Latch-
ing Solenoid Valves.
3. Requests for further information may be directed 
to:
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B70-10174 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington, D.C. 20546. 
Source: Robert J. Frye, Heinz L. Wimmer
and Raymond Fischer
Lewis Research Center

(LEW- 10926) 
Brief 70-10174	 Category 01


Electronic position indicator for latching solenoid valves

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