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Valves: Accessories: Air Maintenance Device

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Model H-1 Air Pressure Maintenance Device is an automatic, field-adjustable device of the pressure reducing type. It is used to control the supervisory air pressure in a dry pipe sprinkler system, preaction system, or dry pilot line system of a dry pilot sprinkler actuated deluge or preaction valve.

The H-1 is utilized in applications where there is a compressed air (or nitrogen) source which is at a higher pressure than the desired system pressure. Pressure sources include plant air supplies having their own automatic compressor controls, or nitrogen supplies having single stage cylinder mounted pressure regulators.

The 1/2" globe valve is opened to quickly admit air to the dry pipe system. It is closed once the desired system air pressure has been established. As pressure drops on the system side of the 1/4" check valve, the regulator and metering orifice operate automatically to replace small losses of air which periodically occur in the system due to temperature or other system variations.

The regulator and metering orifice limit the volume of air introduced to assure that the rate of air replacement is less than that from a discharging sprinkler so that system activation may take place.

Model H-2 and H-3 Air Pressure Maintenance Devices are automatic, field-adjustable devices that control the on-off cycling of an air compressor. They are used to control the supervisory air pressure in a dry pipe sprinkler system, preaction system, or dry pilot line system of a dry pilot sprinkler actuated deluge or preaction valve.

The H-2 and H-3 are utilized in applications where it is desirable or necessary to use a small, non-tank mounted compressor that is to be dedicated to the system to be pressurized. The H-2 and H-3 monitor system pressure and automatically cycle the air compressor on and off to maintain system pressure within the preset limits.

Model H-2 should be specified when the primary air compressor has an unloader as an integral part.

After the initial system air pressure has been established, the 1/2" Globe valve is closed. As pressure on the system side of the 1/4" check valve drops, the air pressure switch contacts close, causing the compressor to start. A restricted orifice limits the rate at which air is replaced. When the system air pressure has been re-established, the switch contacts open, stopping the compressor.

Model H-3 is similar in operation to the Model H-2, however, it incorporates an unloader valve.

The Model H-3 is selected when the primary air compressor is not equipped with an unloader device. After the compressor has re-established the required air pressure on the system side of the check valve, the air pressure switch contacts open, stopping the compressor and operating a release valve.

The release valve vents the compressor head to exhaust the air trapped between the compressor head and the by-pass check valve. On the next automatic operating cycle, the compressor will start against atmospheric pressure, thus preventing excessive starting loads.

Model H-1 Air Pressure Maintenance Device is an automatic, field-adjustable device of the pressure reducing type. It is used to control the supervisory air pressure in a dry pipe sprinkler system, preaction system, or dry pilot line system of a dry pilot sprinkler actuated deluge or preaction valve.

The H-1 is utilized in applications where there is a compressed air (or nitrogen) source which is at a higher pressure than the desired system pressure. Pressure sources include plant air supplies having their own automatic compressor controls, or nitrogen supplies having single stage cylinder mounted pressure regulators.

The 1/2" globe valve is opened to quickly admit air to the dry pipe system. It is closed once the desired system air pressure has been established. As pressure drops on the system side of the 1/4" check valve, the regulator and metering orifice operate automatically to replace small losses of air which periodically occur in the system due to temperature or other system variations.

The regulator and metering orifice limit the volume of air introduced to assure that the rate of air replacement is less than that from a discharging sprinkler so that system activation may take place.

Model H-2 and H-3 Air Pressure Maintenance Devices are automatic, field-adjustable devices that control the on-off cycling of an air compressor. They are used to control the supervisory air pressure in a dry pipe sprinkler system, preaction system, or dry pilot line system of a dry pilot sprinkler actuated deluge or preaction valve.

The H-2 and H-3 are utilized in applications where it is desirable or necessary to use a small, non-tank mounted compressor that is to be dedicated to the system to be pressurized. The H-2 and H-3 monitor system pressure and automatically cycle the air compressor on and off to maintain system pressure within the preset limits.

Model H-2 should be specified when the primary air compressor has an unloader as an integral part.

After the initial system air pressure has been established, the 1/2" Globe valve is closed. As pressure on the system side of the 1/4" check valve drops, the air pressure switch contacts close, causing the compressor to start. A restricted orifice limits the rate at which air is replaced. When the system air pressure has been re-established, the switch contacts open, stopping the compressor.

Model H-3 is similar in operation to the Model H-2, however, it incorporates an unloader valve.

The Model H-3 is selected when the primary air compressor is not equipped with an unloader device. After the compressor has re-established the required air pressure on the system side of the check valve, the air pressure switch contacts open, stopping the compressor and operating a release valve.

The release valve vents the compressor head to exhaust the air trapped between the compressor head and the by-pass check valve. On the next automatic operating cycle, the compressor will start against atmospheric pressure, thus preventing excessive starting loads.



Data Sheet: -
Model H-1 Air Pressure Maintenance Device


Data Sheet: -
Model H-2 and H-3 Air Pressure Maintenance Device
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Model H-1 Air Pressure Maintenance Device

Model H-2 or H-3 Air Pressure Maintenance Device