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- Features
- Drilled vent with dust cover
- Prevents internal vacuum conditions-guards against siphonage, burnt-out heaters and collapsing of storage tanks and negative pressure
- Opens quickly in emergency situations on a one in mercury vacuum
- Every valve is tested for performance prior to shipping
- Water service
- 1 in Hg vacuum relief pressure open
- Brass body cap and internal parts
- Stainless steel spring
- Polypropylene dust cover
- STANDARD_APPROVALS: ANSI Z21.22/CSA 4.4|CSA Certified
- APPLICATION: For protection of commercial hot water supply systems and pressure vessels against negative pressure