Fluid handling – Systems – Programmer or timer
Patent
1986-10-17
1988-01-12
Cohan, Alan
Fluid handling
Systems
Programmer or timer
361156, 361167, 13762564, 13762565, F16K 3102
Patent
active
047184540
ABSTRACT:
The system is particularly suitable for controlling a solenoid valve SV1 having two stable operating positions in accordance with programmed `on` and `off` periods set at a 24 hour timer 10. The valve typically in one position connects a gas supply to a regulator ensuring the latter then supplies gas at a higher pressure; and in the other position connects the regulator to atmosphere through a vent stack so that the regulator then supplies gas at a lower pressure. The system is powered by 3 volt batteries B1, B2 and has extremely lower current consumption giving a battery life of 5-6 years. The solenoid 18 is energised briefly by voltage pulses fed from a capacitor C5 via a reversing switch 16. Automatic battery voltage checking is incorporated.
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patent: 4534539 (1985-08-01), Dettmann
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British Gas plc
Cohan Alan
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