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US 6,396,404 B1Granted
Double check valve assembly for fire suppression system
AssigneeAGF Manufacturing, Inc.
InventorGeorge J. McHugh
Life of this patent
Estimating the term…
Abstract
A double check valve assembly having at least one three way valve with a pressure gauge in communication with the double check valve downstream of the second check valve. A flow detection arrangement with a battery powered alarm and automatic dialer and time delay circuit is included with a test and drain valve arrangement provided downstream of the second check valve.
Claims32
A back flow prevention arrangement for a fire suppression sprinkler system, comprising:
- a first check valve;
- a second check valve;
- a first test port downstream of the second check valve;
- a second test port provided between the first check valve and the second check valve;
- in a third test port upstream of the first check valve;
- a first three way valve having an inlet and first and second outlets, the inlet of the three way valve being provided at the first test port;
- and,
- a first pressure gauge provided at one of the first and second outlets of the three way valve.
5 more elements
A back flow prevention arrangement for a fire suppression sprinkler system, comprising:
- a first check valve;
- a second check valve;
- a first test port downstream of the second check valve;
- a second test port provided between the first check valve and the second check valve;
- a first three way valve having an inlet and first and second outlets, the inlet of the three way valve being provided at the first test port and,
- a first pressure gauge provided at one of the first and second outlets of the three way valve.
3 more elements
Dependencies are inferred from the claim text.