duff co regulators-backflowpreventers-meters four basic types of backflow preventers description installed at examples type purpose 1 2 3 4 reduced pressure zone back two independent check valves all cross-connections subject to main supply lines with intermediate relief valve backpressure or back siphonage commercial boilers flow preventer hospital equip for high hazzard cross connections supplied with shut-off valves where there is a high potential lab equipment and ball type test cocks health contamination and continuous pressure applicawaste digesters continuous pressure tion car washes reduced pressure detector assy high hazzard rpz valve backflow preventers with a water meter and rpz in by pass line fire protection system supply main detects leaks and unauthorized use of water fire sprinkler lines all cross-connections subject to double check valve assembly two independent check valves backpressure or back siphonage for low hazzard cross connections where there is a low potentia
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duff co regulators-backflowpreventers-meters watts backflow preventers watts nfl9 laboratory faucet vacuum breaker has 3/8 male inlet connections fits standard laboratory faucet pipe outlet or gooseneck outlet fits standard lab hose nipple or aspirator polished chrome finish max pressure 125 psi fig no price 8686 hose connectors watts 8 a hose connection vacuum breakers for back-siphonage protection for potable hoses attached to hose thread faucets prevent the flow of contaminated water back into the portable water supply furnished with with feature that allows sill cock to be drained this feature fig no price is non-removable 8678 without drainage feature watts 8 same as 8a except has no non-removable drainage feature watts n9 backflow preventer with atmospheric vent for exposed serviceable installations for in-line continuous pressure applications double check design providing dependable protection against both back-siphonage and backflow all brass construction size 1/4 3/8 wat
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regulators-backflowpreventers-meters watts backflow preventers watts 909 provides protection in cross-connection control and containment for cold and hot water installations furnished with npt connections and quarter-turn full port resilient seated bronze ball valve 175 psi 140of bronze body construction modular design replaceable seats ball valve test cocks easily serviced with no special tools captured spring assemblies with bronze strainer size length weightw fig no price strainer 3/4 1 1 1/4 1 1/2 2 21 1/4 22 1/4 25 5/8 27 3/16 30 3/4 15 5/8 17 1/2 42 3/4 44 473/8 8643 8644 8645 8646 8647 duff co watts 909 sizes 2 1/2 to 10 air in/water out principal provides high capacity relief valve discharge during the emergency conditions of combined back-siphonage and back pressure with both checks fouled epoxy coated cast iron check valve body with bronze seats 175 psi to 140of removable bronze seats stainless steel internal parts easily serviced with no special tools captured spring as
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regulators-backflowpreventers-meters duff reduced pressure zone backflow preventers co rebuild kits also available for wilkins zurn combraco febco hersey check valve kits when ordering please specify fig no and valve size fig no kit no first check kits 85637 rk909ck1 64683 rk909ck1 85638 rk909ck1 85639 rk909ck1 85640 rk909ck1 second check kits size 2 1/2 3 4 6 8 10 price fig no kit no size first check rubber parts kits 85646 rk909rc1 2 1/2 3 85647 rk909rc1 4 85648 rk909rc1 6 85649 rk909rc1 8 85650 rk909rc1 10 second check rubber parts kits kit consists of lower check stem o-ring 6 only check disc cover o-ring and lubricant price kit consists of disc spring assembly cover o-ring and lubri cant 64685 85641 85642 85643 85644 seal kits rk909ck2 rk909ck2 rk909ck2 rk909ck2 rk909ck2 2 1/2 3 4 6 8 10 85651 rk909rc2 2 1/2 3 85652 rk909rc2 4 85653 rk909rc2 6 85654 rk909rc2 8 85655 rk909rc2 10 cover kits for checks kit contains of cover cover o-ring and lubricant kit consis
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duff co regulators-backflowpreventers-meters reduced pressure zone backflow preventers relief valve kits when ordering please specify fig no and valve size fig no relief valve rubber parts 85660 85661 85662 85663 relief valve total 64689 85665 85666 85667 total rubber parts kits 85704 63072 85705 85706 85708 85707 85709 page 362 kit no size price kit consists of sleeve o-ring piston o-ring stem o-ring rv disc assembly diaphragm piston seal bottom plug o-ring adapter o-ring and lubricant rk909rv rk909rv rk909rv rk909m1rv 2 1/2 3 4 6 8 10 4 10 kit consists of diaphragm disc piston assembly seat seat o-ring adapter o-ring and lubricant sizes 4 -10 m1 includes bottom plug spring assembly rk909vt rk909vt rk909vt rk909m1vt 2 1/2 3 4 6 8 10 4 10 kit consists of lower check stem o-ring 6 only check disc cover o-ring sleeve o ring piston o-ring rv disc assembly diaphragm piston seal and lubricant rk909rt rk909rt rk909rt rk909rt rk909m1rt rk909rt rk909m1rt 2 1/2 3
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duff co regulators-backflowpreventers-meters duff flow regulators assembled to your specifications duff offers a wide range of flow controls that are ideal for use in private homes and buildings water flow rate can be equalized throughout the home or building by installing a flo-et at the inlet to each appliance and water usage can be reduced substantially by controlling the volume of water used in sinks showers and drinking fountains flo-et flow controls can be incorporated into in-line housings for specific contact time with point-of-use water filters residential and light commercial flo-et flow controls are available in flow rates form 1/4 to 20 gpm for temperatures less than 140o 56161 39025 53503 54039 specify flo rate duff commercial/industrial flo-ets provide flow control in a variety of applications including multi-story buildings water treatment equipment cooling towers and agricultural irrigation systems these highly efficient flow controls are available in flow rates fro
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regulators-backflowpreventers-meters duff flow regulators duff co flo-et flow controls offer many advantages over conventional valve-type flow controls initially flo-et controls cost less to install and because they require no maintenance or adjustments they maximize cost saving over the life of your equipment flo-et flow controls are completely tamper-proof yet authorized persons can easily alter them for increases or decreases in flow rate duff offers a wide range of customized flo-et inserts to meet your exact application needs both flo-et inserts and retainers are ideal for incorporation into custom-designed housings this provides additional cost savings by eliminating the need to purchase the brass housing because of our unique design duff can offer you the option to purchase only the flo-et insert or the insert and the retainer 52289 49208 49887 49888 49890 49891 49892 49893 49894 49895 49896 49897 49898 72560 49886 50657 49889 70974 49875 49881 49878 49882 49883 49885 50658 for
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duff co regulators-backflowpreventers-meters for food service duff pvc flow controls are designed for applications where constant flow rates are required and variable pressures are encountered they are ideal for use in environments where metal housings are not recommended such as high purity deionized water applications flow capacities are available from 1/4 gpm to 540 gpm specify exact gpm flow rate duff flow regulators pvc flow regulators frs-series flow regulators ss-g series stainless steel flow regulators threaded flow no of pipe size model length apprx fig no rate inserts a no b weight gpm 1 inches lbs .25-3.5 1 1/2 t-050-1 2 .05 53801 .25-10 1 3/4 t-075-1 2 .06 65707 5-20 1 1 t-100-1 3 .12 47566 10-20 2 1-1/4 t-125-2 3 .18 83723 20-40 4 1-1/2 t-150-4 3 .25 61035 35-70 7 2 t-200-7 3 .31 53585 45-90 9 2-1/2 t-250-9 4 .56 83731 70-140 14 3 t-300-14 4 .68 52813 120-250 25 4 t-400-25 4 1.00 52782 270-540 54 6 t-600-54 4 2.50 83732 plainend flow no of pipe size model length apprx
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duff co regulators-backflowpreventers-meters flo-meters midwest sightflowindicators inexpensive protection for expensive equipment manufactured of quality materials and safety-tested to assure you of long dependable service at an economical price sight flow indicators are standard construction indicators of other metals pressures and temperatures are available all standard production sight flow indicators have the following specifications bonze body 304 stainless spinner shaft lightweight plastic spinner for indicating low flow operating pressure 125 psi operating temperature 200of glass windows hydrostatically tested to double recommended rating window available in tempered glass size glass thickness 1/4 1/4 1/4 1/4 3/8 3/8 length height width fig no price meter box lid 1/2 3/4 1 1 1/4 1 1/2 2 3 13/16 3 13/16 4 1/16 4 1/16 5 11/32 5 11/32 2 1/8 2 1/8 2 5/8 2 5/8 3 3/4 3 3/4 1 3/4 1 3/4 2 7/8 2 7/8 3 1/4 3 1/4 16376 16378 16380 16382 16385 16388 e-z view rate-
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regulators-backflowpreventers-meters fig no 61513 61514 47779 61516 61519 61520 61521 47780 47781 61522 61523 61524 61525 duff co price flo-meters flow rate .025 to .250 .025 to .250 .1 to 1 .1 to 1 .2 to 2 .2 to 2 .5 to 5 .5 to 5 1 to 10 3 to 30 gph 3 to 30 gph 5 to 60 gph 5 to 60 gph pipe size 3/8 mpt 1/2 mpt 3/8 mpt 1/2 mpt 3/8 mpt 1/2 mpt 3/8 mpt 1/2 mpt 3/4 mpt 3/8 mpt 1/2 mpt 3/8 mpt 1/2 mpt fig no 61526 61527 61528 61529 61530 61531 61532 61533 61534 61535 61536 61537 61538 61540 61541 61542 61546-61553 flow rate .025 to .250 .025 to .250 .025 to .250 .1 to 1 .1 to 1 .1 to 1 .2 to 2 .2 to 2 .2 to 2 .5 to 5 .5 to 5 .5 to 5 1 to 10 1 to 10 1 to 10 1 to 10 pipe size 3/8 mpt 1/2 mpt 1/2 id barb 3/8 mpt 1/2 mpt 1/2 id barb 3/8 mpt 1/2 mpt 1/2 id barb 3/8 mpt 1/2 mpt 1/2 id barb 1/2 mpt 3/4 mpt 1/2 id barb 5/8 id barb price fig no flow rate pipe size 3/8 fpt 1/2 mpt 3/8 fpt 1/2 mpt 3/8 fpt 1/2 mpt 3/4 mpt 3/4 mpt 1 fpt 1 fpt 1 fpt 1 fpt 2 fpt
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duff co regulators-backflowpreventers-meters shock suppressors therm-x-trol thermal expansion tank steel shell polypropylene liner butyl diaphragm max operating pressure=200of standard factory precharge 40 psig for use with potable water heaters only therm-x-trols are pressurized diaphragm-type expansion tanks designed to accept the expansion of water created when a storage tank is heated keeping the system pressure below the relief valve setting fig no max psig 43561 38696 49699 150 150 150 tank vol 2.0 4.4 10.3 sys conn 3/4 3/4 1 dia 8 11 15 3/8 price diatrol shock supressor max working pressure=100 psig max shock pressure=150 psig max operating temperature=200 o f precharge pressure=22 psig large size to 48 diameter available compressible air volume is held within a light weight deep drawn steel vessel this air chamber carefully calculated is separated from system water by a heavy-duty sealed-in butyl diaphragm that prevents loss of air and water logging the air pressure can be m
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