Pressure control isolation and flood preventative tank for a hot water based heating system

Abstract

The present invention provides a pressure control isolation tank for a closed loop heating system. A diaphragm within the tank separates heating system fluid from non-system fluid. The heating system fluid is provided under constant pressure, typically 12 PSI. Usually the non-system fluid is service water or clean water flowing through a pressure reducing valve. As the heating system loses system fluid through tiny leaks, and also loses air through vents, the non-system fluid causes the diaphragm to displace the volume lost by the leaked heating system fluid and leaked air. Thus, the heating system fluid is maintained at a constant pressure.

Description

FIELD OF THE INVENTION [0001] The present invention relates generally to the field of fluid based temperature control systems and, more particularly, to a pressure control isolation tank that keeps a constant fluid pressure within a hot water heating system. BACKGROUND OF THE INVENTION [0002] There are many types of hot water based heating systems, which use water, antifreeze or a combination thereof. These hot water based heating systems include, but are not limited to, baseboard and cast iron radiator systems, in-floor radiant heating systems, in-sidewalk radiant heating systems, solar heating systems each of which contain fluids under pressure. [0003] It is well known that during operation of the hot water heating systems, air in the heating system separates from water and is typically vented into the atmosphere through automatic vents installed throughout the system. It is also a fact that tiny invisible leaks of the fluid may occur in the hot water heating system through thread...

AI Technical Summary

Benefits of technology

[0016] It is yet another object of the present invention to prevent destruction associated with major leaks from temperature control systems.

[0018] It is still another object to provide a safe barrier between heating system fluid and service water so that no contamination can be had in drinking water.

[0030] In yet another embodiment, the pressure control isolation tank further includes an upper diaphragm superimposed over a lower diaphragm separated by a layer of air. A viewing glass disposed on an outer surface of the tank adjacent to the layer of air allows the user to determine whether there is a leak within either of the upper or lower diaphragm.

Problems solved by technology

However, these glycol makeup systems are expensive and thus usually limited mostly to commercial and industrial applications.

There are some problems inherent in this system.

First, where the hot water system incurs a significant leak, the pressure reducing valve feeds the system with water from the water supply so that the fluid, water, antifreeze or combination thereof leaks from the system until somebody notices such leak.

The leak can cause extensive damage to the building, surrounding objects as well as to the heating or cooling system.

Second, due the air venting and the tiny or significant fluid leaking, the system containing antifreeze is constantly diluted with water from the water supply via feeding the pressure reducing valve whether the system operates normally or the system incurs a significant leak.

Such dilution leads to freezing and bursting heating system components such as water lines, radiators, etc, which are expensive to repair.

Third, where water fed to the heating system from the water supply is hard, containing certain minerals, such as lime, sulphur, etc., the pressure reducing valve as well as other heating system components become corroded due the presence of the minerals.

This corrosion, as a rule, leads to seizing of the pressure reducing valve in an open or closed position and the pressure cannot anymore be controlled by the valve thus resulting in an underpressurized or overpressurized system.

Both conditions have serious negative consequences for the system and its surrounding items.

Fourth, when for any reason the pressure in the service water supply drops below a certain level, typically below 12 PSI, and a check valve or backflow preventer fails, system fluid which could contain antifreeze backflows into the service water supply, thus affecting the household drinking water.

Fifth, the system containing antifreeze and pressurized by a pressure reducing valve is cumbersome to service.

Charging antifreeze back into the system and purging air pockets requires a portable pump and often a significant amount of time.

Because of the relatively high cost of the pump, the pump is often not available for a technician on call.

Thus, the technician usually just adds more water into the system which leads to all of the negative consequences of the diluted fluid.

However, this requires constant monitoring which is not convenient.

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