Watts 0383740 Valve Els PW 17895 What systems typically use this

What systems typically use this relay board

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The integrated mounting bracket contains three tapped holes

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Watts 0383740 Valve Els PW 17895 What systems typically use thisThe Watts 0383740 (Series 740) is a high capacity iron body boiler pressure relief valve designed specifically for large scale hot water industrial and commercial heating systems. This ASME Section IV certified valve features a 1. 5 inch NPT female inlet and a 2 inch NPT female expanded outlet to facilitate rapid pressure discharge, effectively preventing catastrophic system failure due to thermal runaway. With a factory set relief pressure of 40 PSI