MIL-DTL-19772B

Abstract

This specification covers automatic temperature regulating valves for steam, water, and other fluid service where accurate temperature control of fluid is required. These valves are of the self-operated type requiring no external power supply such as oil, water, steam, electricity, or compressed gas for their operation. However, when the fail safe mode is required (see <a>6.2</a>), it can be externally powered. <br>Automatic temperature regulating valves are of the following types, classes, and series as specified (see <a>6.2</a>): </span><pre> Type I - Direct operated 3-way valves - series 100, 150. Type II - Direct operated 2-way valves. Class 1 - Direct acting (heating service) - series 100, 150. Class 2 - Reverse acting (cooling service) - series 100, 150, 250, 700. Type III - Pilot operated 2-way valves. Class 1 - Direct acting (heating service) - series 100, 150, 400, 600. Class 2 - Reverse acting (cooling service) - series 100, 150, 400, 600.</pre> <br> <strong>Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 03R42, Department of the Navy, 2531 Jefferson Davis Highway, Arlington, VA 22242-5160 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.</strong> <pre> Type IV - Pilot operated, 2-way, combined temperature and pressure (heating service) - series 100, 150, 400, 600 --- 4:1 ratio and 1:1 ratio.</pre> <br> <br><b><u>Intended Use:</u></b> Type I valves are intended for use in lube oil cooler, diesel engine cooling service, and other water mixing services where proportioning of water to a cooler and a by-pass is required. Type II valves are intended for use with water heaters and other apparatus where steam or hot water is used to heat water and for condensate recirculation and general cooling services. Type II, series 250 and 700 valves are intended primarily for use in cooling service where sea water is the cooling fluid. Type III valves are intended for services (such as water heaters) where fine control over a narrow range is required and where direct operated valves are not suitable for the pressures, temperatures, and response requirements. Type IV valves are intended for use on water heaters, fuel oil heaters, and for any other apparatus where steam is used as the heating medium. Type IV valves are intended for use where close control is required and on services like instantaneous heaters where direct operated valves and type III valves are not suited. <br>