Armstrong TV-2 Balanced Pressure Thermostatic Air Vent provides positive venting of air from chamber type heat transfer equipment with no loss of steam. Typical applications include jacketed kettles, retorts, vulcanizers, jacketed sterilizers, or other contained equipment where air could accumulate at the top of the steam chamber and reduce heat transfer capacity.

The Model TV-2 responds to the pressure-temperature curve of steam at any pressure from light vacuum to maximum operating pressure. Air is automatically vented at slightly below steam temperature throughout the entire operating pressure range. The thermostatic element is a charged multi-convolution phosphor bronze bellows caged in stainless steel. The valve and seat are also stainless steel, designed to meet the most rigid cycling specifications known for this type of service.

Features

• Stainless steel hemispherical valve and seat.
• Thermostatic element comprises a multi-convolution phosphor bronze bellows caged in stainless steel.
• Thermostatic element is charged with water to provide positive opening of the valve at slightly below steam temperature and positive closing in the presence of steam throughout the operating pressure range.
• ASTM B62 cast bronze body.

Materials

Name of Part	Material
Body & Cap	Cast bronze ASTM B62
Gasket	Compressed non-asbestos
Thermostatic Unit Bellows Cage and Cover	Phosphor bronze, Stainless steel
Thermostatic Unit Gasket	Copper clad

Physical Data

Specification	Value
Pipe Connections	3/8", 1/2" (10 mm, 15 mm)
"A" (Diameter)	2-3/16" (56 mm)
"B" (Height)	3-1/2" (89 mm)
Weight	1 lb. 9 oz. (0.8 kg)
Maximum Operating Pressure	125 psig (9 bar)
Maximum Temperature	350°F (177°C)

Installation

Armstrong Model TV-2 Thermostatic Air Vents should be installed at the highest points of steam chambers with inlet connections to the vents higher than the highest points of the chambers. Thus installed, there is a minimum hazard of any liquid carryover and air can be vented to atmosphere with no drain line necessary.

Typical Installations

Fig. 2-1. Installation on a retort.

Fig. 2-2. Installation on a sterilizer.

Fig. 2-3. Installation on a vulcanizer.

Fig. 2-4. Installation on jacketed kettles.

Maintenance and Safety

Equipment under pressure

Operating temperature > 100°C (212°F). Make sure the vent is cold and depressurized before handling!