Valve modulation method and system utilizing same

Details Valve modulation method and system utilizing same Valve modulation method and system utilizing same

1999-01-25

2000-11-28

Tapolcai, William E.

Automatic temperature and humidity regulation

Motors

Relay

251 11, G05D 23275

Patent

active

061523763

ABSTRACT:
A valve modulation method and a system utilizing the method is provided. In a hydronic heating system having primary and secondary loops, a simple two-position valve is powered on an intermittent duty cycle to regulate the amount of flow of boiler water from the primary loop to a radiation system in the secondary loop. The actuator of the valve is pre-powered so that it is fully responsive to this intermittent duty cycle. By only supplying power to the actuator of the valve intermittently, the piston of the valve remains in a partially open position, and allows some flow to pass from the primary loop to the secondary loop. The position of the valve remains constant, owing to the duty cycle being shorter than the response time of the valve. By pre-powering the valve, the lag time it takes for the valve to become responsive to changes in the duty cycle is significantly reduced or eliminated. In this fashion, the temperature of the water in the secondary loop may be controlled.

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patent: 5971288 (1999-10-01), Davis et al.

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