Relief valve assembly
AssigneeZurn Water, LLC
InventorWilliam M. Orr
Life of this patent
Estimating the term…
Abstract
A relief valve for a backflow preventer includes a plunger, a lock nut, and a seal. The plunger has a female fastening section and a first seal engagement surface. The lock nut has a male fastening section and a second seal engagement surface. The male fastening section is received by the female fastening section to bring the first seal engagement surface toward the second seal engagement surface. The seal is positioned between the first seal engagement surface and the second seal engagement surface.
Claims20
A shroud for a relief valve, the shroud comprising:
- a first portion having a first tongue and a first groove, the first groove positioned on an opposite side of the first portion from the first tongue;
- and
- a second portion having a second tongue and a second groove, the second groove positioned on an opposite side of the second portion from the second tongue, the first groove receiving the second tongue and the second groove receiving the first tongue to enclose at least a portion of the relief valve;
- at least one of the first portion and the second portion including a removable tab, removal of the removable tab forming a window in the one of the first portion and the second portion.
A relief valve for a backflow preventer, the relief valve comprising:
- a plunger having a female fastening section and a first seal engagement surface;
- a lock nut having a male fastening section and a second seal engagement surface, the male fastening section received by the female fastening section to bring the first seal engagement surface toward the second seal engagement surface, the lock nut including a through hole;
- a seal positioned between the first seal engagement surface and the second seal engagement surface;
- and
- a compression spring positioned in the through hole of the lock nut to engage the plunger.
A relief valve cover for coupling a drain funnel to a relief valve, the relief valve cover comprising:
- a cover body for providing a fluid seal to cover an end opening of the relief valve, the cover body including an attachment surface, the attachment surface including a first opening configured to receive a first fastener for coupling the cover body to a frame of the relief valve;
- a water supply passage positioned in the cover body;
- a recess positioned on the cover body adjacent the attachment surface, the recess in fluid communication with the water supply passage and receiving pressurized water from the water supply passage, pressurized water in the recess configured to act on a valve member of the relief valve against a force exerted by a biasing member;
- and
- a second opening configured to receive a second fastener to engage the drain funnel, the second opening not extending through the attachment surface.
Dependencies are inferred from the claim text.