The Apollo Model DC4A Double Check Valves are designed to prevent contamination of the water supply due to back-siphonage or backpressure from substances that are objectionable, but non-health hazards. The modular check valve cptured spring cartridges have replaceable seats and reversible silicone seat discs. Apollo ball valve shut-offs with stainless steel handles and nuts are standard. During normal flow conditions, the two check valves are held off their seats, supplying water downstream. Each check valve is designed to maintain a minimum of 1 psi across the valve during normal operation. Should the downstream pressure increase to within 1 psi of supply pressure, both check valves will close to prevent a backflow condition. No special tools required. 5 year, domestic warranty. UL - Pending. ASSE 1015, CSA approved. Chloramine-resistant elastomers. Patent pending. Maximum working pressure 175 psi. 33 /180 degrees F Temperature range. Bronze body. Cast Bronze C84400 caps. Glass-Filled PPO Check Valves. 300 Series Stainless Steel Springs. Chloramine-resistant Silicone Seat Discs. Chloramine-resistant EPDM O-rings. Stainless Steel Ball Valve Handles.
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