Febco 805Y Operation And Maintenance

Febco 805Y Operation And Maintenance Manual pdf 1 page image

FEBCO Operation and Maintenance805Y / 805YB / 805YSDouble Check Assembly (3/ 4" – 2")FEATURES AND OPERATING PROCEDURESThis device consists of two independently operating poppet type check valves. Each check valve is spring loaded to maintain a minimumof 1 PSIG differential pressure across the check in a no-flow condition. In a normal flow condition the checks open an amount correspond-ing to the flow rate. During a backflow (backpressure) situation the seat discs close and seal to prevent any flow reversal. Sizes 3/4"through 2" (805Y, 805YB, 805YS, 805YR) include two spring-loaded, Y-pattern bronze check valves, two bronze shut-off valves and fourtestcocks for field testing. All valves are threaded type and the unit is shipped completely assembled.GENERAL SERVICE PROCEDURES (General service instructions applicable to all sizes.)1. Rinse all parts with clean water prior to assembly.2. DO NOT USE ANY PIPE DOPE, OIL, GREASE OR SOLVENT ON ANY PARTS unless instructed to do so.4. Do not force parts. Parts should fit freely together. Excess force may cause damage and render the device inoperable.5. Carefully inspect seals, seating surfaces, etc. for damage or debris.5. Test unit after servicing to insure proper operations.6. Refer to applicable parts list and figures for more information.7. A table on page 3 provides size and material information for standard parts (non-special design). These parts can usually bepurchased locally from parts distributors.8. Some water conditions can cause a buildup of calcium or similar material deposits on some moving parts. Normally this conditionwould not occur on devices used in systems with varying flow rates. The scraping action of moving parts helps to remove any deposits.However, with devices used on static systems such as firelines, any deposits would not be scraped away and could interfere with thecheck valve operation. Devices in these applications should be disassembled and inspected on a periodic basis depending on waterquality. Any deposits should be removed from the center guiding stem and bushings. Use care to avoid damage to guiding surfaces.TROUBLESHOOTING GUIDESymptom #1Check fails to hold 1.0 PSID min.Symptom #2Chatter during flow conditions.Symptom #3Low flows passing through themainline valve.Cause:A. Debris on sealing surfacesB. Leaking shut-off valveC. Damaged seat disc or seat ringD. Damaged guide holding check openE. Weak or broken springCause:A. Worn or damaged guideCause:A. Mainline check fouledSolution:Disassemble and cleanDisassemble and clean or repairDisassemble and replaceDisassemble and replace guide pinand/or sleeve bushingDisassemble and replace springSolution:Disassemble and repair or replace guideSolution:Inspect and clean, or repair®

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