Prevents internal vacuum conditions that could collapse storage tanks - especially copper. Opens quickly in emergency situations. Opens on less than 1 mercury vacuum. Bronze body with a male inlet, integral body seat and silicone seat disc. Maximum water pressure 200 psi; Maximum steam pressure 15 psi; Maximum temperature 210•F (121•C). Capacity 13 SCFM at 2 mercury. Available with dust cover.
Designed to protect hot water supply systems and pressure vessels.
1/2 and 3/4
The VR-801 is certified to ANSI Z21.22 and listed by CSA.