Series TD - SCHROEDAHL

1 Series TDType TDLType TDMThe SCHROEDAHL Automatic Recirculation Valve is utilized as a Pump Protection SystemSeries TDThe SCHROEDAHL Automatic Recirculation Valve is utilized as a Pump Protections SystemFeatures:Dependable Operation Modulating Low maintenance Easy to install Dampens of system pulsations Suitable for all fluids Self powered PreambleSCHROEDAHL is the largest supplier of Automatic Recirculation Valves in the world. These ARV s, or Pump Protection System, are our principal product. During the last 30 years we have supplied more than 35,000 of these valves to satisfied customers all over the recirculation valves protect centrifugal pumps against overheating, excessive noise, instability and cavitation during low flow the flow through the pump falls below a certain level the bypass system opens and the fluid will be recirculated providing the required minimum flow through the main flow positions the check valve at a certain point.

2 The stem of the check valve transmits the motion via a lever to the bypass. The by-pass system controls the bypass flow in a modulating way and reduces the pressure to bypass outlet level. The full minimum flow is bypassed when the check valve is seated. The bypass is fully closed when the check valve is in its upper position, thereby allowing full pump flow to the : Drawing of an Automatic Recirculation Valve type TDM3 Operation of the Automatic Recirculation ValvesFlow sensitiveThe checkvalve moves upwards with increasing main flow and down-wards with decreasing flow. The checkvalve transmits this motion via a lever to the bypass system (Fig. 3 and 4).Type TDLThe TDL consists of the check valve section (Fig. 2) with bypass con-figuration type L (Fig. 3). The lever controls the position of the bushing, which in turn opens more or less the holes in the control head. The minimum flow is thereby bypassed in a modulating way.

3 Applicable for differential pressures up to 580 psi. Standard with non-return TDMThe TDM consists of the check valve section (Fig. 2) with bypass con-figuration type M (Fig. 4). The movement of the lever is transmitted via a piston to the multi-stages vortex plug. The minimum flow is thereby bypassed in a modulating way over several pressure reduction for differential pressures from 300 psi up to 3200 psi. Stan-dard with non-return 24 Fig. 3: Bypass LFig. 4: Bypass MValve sizesStandard size from 1 up to 12 . Other sizes upon ratingPressure rating ranges from Class 150 up to Class 2500. Other ratings upon are as a standard according to ANSI. Flanges according to other standards (DIN, ISO, BS, JIS, NF) are available upon request. The inlet and outlet connections can also be supplied with welding ends. The bypass connection is always flanged (for inspection purposes). Manual start up upon request.

4 Draining or warm up connection are housing materials: ASTM A105 (Carbon Steel) ASTM 316L (Stainless Steel)The standard internals of the TD valves are of stainless steel with a min-imum chrome content of 13%. Other forged materials for housing and internals available upon request. Selection of the seal material is done according to medium and temperature condition. The housing material is selected according to medium pressure and temperature class-CodeConnection-CodeConfiguration-C odeDN 1" = 05 DN 1 " = 06 DN 1 " = 07 DN 2" = 08 DN 2 " = 09 DN 3" = 10 DN 4" = 11 DN 5" = 12 DN 6" = 13 DN 8" = 15 DN 10" = 16 DN 12" = 17150 = 3 300 = 5 600 = 6 900 = 7 1500 = 8 2500 = 0U = Flanges acc. ANSI S = Welding endsV = Vertical installation H = Horizontal installation A = Manual start-up W = Oversized bypass or start-up connection CS = Carbon Steel ASTM A105 SS = Stainless Steel ASTM 316 LExample:TDM116 UVW-CS: Valve type TDM.

5 4 , Class 600, ANSI-Flanges, Vertical installation, housing material in Carbon Steel5 Parts listHousingBypass LHousing 02 03 04 06 07 08 09 25 26 27 28 29 30 Lower body Upper body Stemguide Guide bolt Spring Check valve assembly Check valve Stem Liner or Venturi-Ring Bypass branch Guide pin Bolt Bolt Hexagon nut Hexagon nut O-RingBypass 13 14 15 16 23 31 36 37 38 Control head Lever Pivot pin Crank arm Control bushing Orifice bushing O-Ring O-Ring Spring Bottom ring6 Bypass MManual startupBypass 11 12 13 14 15 16 21 23 31 32 33 34 35 36 Vortex bushing Control head Vortex plug Lever Pivot pin Relief bushing Relief piston Threaded ring Bypass orifice O-Ring O-Ring O-Ring Glyd-Ring O-Ring Glyd-Ring O-Ring Glyd-Ring O-RingManual 18 19 20 23 31 32 36 Vortex bushing Vortex plug Holder Pin Orifice plate O-Ring O-Ring O-Ring7 Nominal size and pressure class of the automatic recirculation valve should be selected preferably the same as the

6 Outlet of the P, R (in.)11 1 22 345681012 Main flow P,R for TDL and TDM valves (GPM)70115175250370550880136519603475546 07830 Bypass Size DN (in.)11111 1 222 345 Bypass flow P-B (us gpm)7979797917517528528552879212301900 Bypass table is only to be used as an indication. Other bypass sizes avail-able upon request. For final valve selection please contact our valve selection:Cv = Qmin x p (psi) Conditions: 4" pump, class 600, main flow is 800 GPM, required bypass flow is 175 GPM is kg/dm3, p is 1000 psi at : a. The main flow is in range of a 4" valve b. The p at minimum flow is 580 psi, this means that we have to select a valve type TDM. c. Cv = 175 x / 1000 = , this means a 4" valve with a 2" bypass can be used as the maximum Cv is = Minimum flow in GPM, = Specific Gravity in kg/dm3 p = available pressure in psi over the bypass at minimum flowConnectionsThe automatic recirculation valve should be installed as close as pos-sible to the centrifugal pump, preferably directly on the outlet of the pump.

7 To prevent low frequency shocks caused by pulsation of the medium, the distance between pump outlet and valve inlet should not exceed 5 ft. Vertical installation is preferred, but horizontal installation is also possible. The TDL and TDM valves operate at a low noise level and ensure a high reliability due to their sturdy and installation instructions are available upon request. Correct operation of the valve is to be checked with the usual opera-tional test of the and selection8 Customer:Enquiry no.:Prior reference:Order no.:Project:Automatic Recirculation Valve Technical DataDatasheet:Quantity:Valve inlet [in.]Valve outlet [in.]Bypass outlet [in.]Start-up [in.]Automatic Recirculation Valve certificates:MaterialsHousing:Internals: [kgs/m ]:Operating temp. [ F]:Design temp. [ F]:QM = gpmQ100 = gpmQmax = gpmQA = gpmH0 = ftHM = ftH100 = ftHQmax = ftHA = ftSuction pr. pv psia/gDifferential pr. (p1-pn) psiBackpress pN psia/gBackpress pA psia/gNotes:classclassclassclassAcc.

8 :Installation: vertical horizontalPaint:Start-up above below checkvalveRevisionDateDescriptionNameSig nature9 DimensionsCodeSizeClassBypassL [in.]S [in.]H [in.]Weight [lbs]Weight [kgs]0731 "1501"7 "6 "3"371707530010 "7 "39/16"713207660010 "7 "39/16"71320779001113/16"77/8"45/16"7132 0781500123/16"8 "4 "95430832"1501"91/16"67/16"39/16"5123085 3001113/16"7 "4 "90410866001113/16"75/8"45/16"1064808790 0133/8"8"51/8"106480881500133/4"93/16"51 /8"130590932 "1501 "117/16"67/8"45/16"7735095300133/8"713/1 6"415/16"13260096600133/8"811/16"415/16" 1526909790015"91/16"5 "15269098150015 "97/8"511/16"196891033"1501 "123/16"7 "4 "974410530015"811/16"5 "1637410660015"97/16"5 "1858410790016 "97/8"57/8"1858410815001711/16"1013/16"6 "2691221134"1502"13 "85/16"415/16"134611153001615/16"97/16"6 1/8"2471121166001615/16"10 "61/8"2781261179001711/16"11"65/16"27812 6118150020 "1113/16"7 "4321961235"1502"15 "10 "55/16"203921253001911/16"117/16"67/8"40 11821266001911/16"1113/16"67/8"456207127 9002011/16"123/16"75/16"4562071281500255 /8"137/16"9 "63929010 CodeSizeClassBypassL [in.]

9 ]S [in.]H [in.]Weight [lbs]Weight [kgs]1336"1502 "187/8"115/8"6 "300136135300215/8"133/4"7 "602273136600215/8"14"7 "63728913790023"14"77/8"6372891381500279 /16"1515/16"97/8"9794441538"1503"235/8"1 59/16"77/8"531241155300255/8"1515/16"87/ 16"103046715660026 "1615/16"87/8"1105501157900279/16"1615/1 6"87/8"11055011581500345/8"19 "123/16"173178516310"1504"28 "1811/16"97/16"90641115630030 "20 "10 "157471416660031 "22"105/8"181782416790031 "22"105/8"18898571681500389/16"227/16"13 3/8"2831128417312"1505"33 "207/8"11"1631740175300357/16"215/8"1113 /16"2050930176600415/16"259/16"143/16"31 421425177900415/16"259/16"143/16"3274148 51781500493/16"285/16"175/16"46302100P = Pump Outlet R = Pipeline/Process B = Bypass connection (A = Start-up connection as option)11 SCHROEDAHL -ARAPP Spezialarmaturen GmbH & Co. KGSchoenenbacher Str. 451580 Reichshof-Mittelagger GERMANY Phone +49 2265 9927-0 Fax +49 2265 info 2007 XYQOM GmbH International Corporation2400 Augusta Dr.

10 Suite 285 Houston, Texas 77057 United States of AmericaPhone +1 713 9758351 Fax +1 713