| 摘要 |
In a dual hydrant, the combination comprising two spaced apart tubular bodies to receive in-flow of fluids A and B, a fluid mixing zone to receive fluids A and B from said bodies, manually operable flow control valves in the two tubular bodies, a primary check valve in one of the bodies to pass forward fluid flow toward said mixing zone, and to block reverse flow in the one body, an outlet from the mixing zone, and a secondary check valve in series with the outlet to pass forward flow from either or both of the two bodies through the outlet, and to block reverse flow from the outlet to the mixing zone.
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