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Pneumatic Decision Element Disclosure Number: IPCOM000092694D
Original Publication Date: 1967-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 28K

Publishing Venue


Related People

Jensen, DF: AUTHOR


This device determines the time relation between two input fluid pressure pulses.

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Pneumatic Decision Element

This device determines the time relation between two input fluid pressure pulses.

At A, recurring fluid pressure pulses P1 and P2 are supplied as inputs to valve 3 having flexible diaphragm 4 and fixed ridge 5. Duct 6 vents to atmosphere through restriction 7 and has output pressure tap Po. Pulses P1 are maintained at twice the pressure of pulses P2. Ridge 5 is displaced from center toward P1 so that diaphragm area A1 is slightly less than half the area of A2. If pulse P2 occurs first, it exerts a force P2 x A2 to close diaphragm 4. The occurrence of pulse P1 can exert a counteracting force of only P1 x A1 so the valve remains closed and Po is low. If pulse P1 occurs first, the upward pressure on diaphragm 4 is some pressure above P2 because of restriction 7. Thus pulse P2 is unable to close, the valve and Po is at a high-pressure level.

The maintenance of P2 pressure at one-half P1 is shown at B where fluid at supply pressure Ps flows through restriction 8, valve 9, and restriction 10. Restrictions 8 and 10 are equal and P2 is taken between ridge 11 and restriction
10. Thus P2 has a magnitude of one-half Ps when pressure P3 is absent and a magnitude of zero when P3 is present.


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