United Brass Works 905APW Short Shank Upper Fixture Overview
The United Brass Works 905APW is a 1/2-inch short shank upper water gauge fixture designed for industrial water and steam applications. It functions as the upper isolation fixture in compatible gauge glass assemblies used to provide direct visual indication of liquid level in steam boilers, tanks, vessels, and other industrial equipment.
The Model 905APW is based on the United Brass Works Model 905A configuration but is supplied with a plastic hand wheel instead of the ductile iron hand wheel used on the standard 905A. United Brass Works specifically identifies the 905APW as the plastic-hand-wheel version of its short-shank upper fixture. United Brass Works, Inc.
The United Brass Works 905APW uses a short shank configuration. Compared with the long-shank Model 905PW, this design provides a more compact arrangement between the vessel connection and the gauge glass assembly. Selection between short- and long-shank fixtures should consider available installation space, insulation thickness, gauge glass position, and the geometry of the existing equipment.
The base Model 905A design is rated for 250 WSP at temperatures up to 406°F and 400 WOG. It incorporates a rising stem and bronze body and is intended for water and steam service. United Brass Works states that its individual water gauge fixtures are 1/2-inch models with bronze bodies and rising stems designed for this pressure and temperature range. United Brass Works, Inc.
The rising-stem configuration provides visible stem movement as the valve is opened or closed. This allows the upper connection of the gauge glass to be manually isolated when inspection, cleaning, replacement, or other maintenance of the water gauge assembly is required.
The Model 905A construction on which the 905APW is based includes a bronze body, brass stem, brass packing nut, brass glass washer nut, brass bevel washers, EPDM glass washer, steel hardware, and NAFG packing. The primary distinction of the 905APW configuration is the plastic hand wheel. United Brass Works, Inc.
The short-shank fixture configuration has published dimensions of approximately 1.25 inches for dimension A, 5.20 inches for dimension B, and 5.02 inches for dimension C. United Brass Works lists approximately 0.63 lb for the standard Model 905A configuration. Because the 905APW is the plastic-hand-wheel variant of that model, these dimensions correspond to the underlying short-shank fixture design. United Brass Works, Inc.
When installed in a complete water gauge system, the upper fixture works together with a compatible lower fixture, gauge glass, sealing washers, packing components, and any required protective hardware. Correct fixture spacing and gauge glass length should be verified for the specific boiler, tank, or vessel before installation.
United Brass Works also offers complete fixture sets using plastic hand wheels. For example, the Model 34018PW is a short-shank gauge fixture set with plastic hand wheels rated for 250 WSP at 406°F maximum and 400 WOG, demonstrating the use of this configuration in complete water-level gauge assemblies. United Brass Works, Inc.
The United Brass Works 905APW is well suited as a replacement upper fixture where the existing installation requires a 1/2-inch short-shank design and a plastic operating hand wheel. It can also be incorporated into compatible new gauge glass installations when its pressure, temperature, connection, and dimensional specifications match the system requirements.
United Brass Works assigns CRN OCO7135.2C to the underlying 905A fixture design. Manufacturer documentation states that these products contain lead and are not intended for use in potable water systems or systems intended for human consumption.
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