Pressure Relief Valve Overflow Valve Type DHV 715 Type DHV 716 Type DHV 725

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Carol Parrish
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Pressure Relief Valve Overflow Valve Type DHV Type DHV Type DHV DIBt* approve DIBt* approve High repeating accuracy, with union sockets or spigot ens Print / The optimal monitoring valves Sizes up to

1 Pressure Relief Valve Overflow Valve Type DHV Type DHV Type DHV DIBt* approve DIBt* approve High repeating accuracy, with union sockets or spigot ens Print / The optimal monitoring valves Sizes up to Operating pressure up to bar (PN ) Wie set range: DHV :. -. bar DHV :. -. bar DHV :. -. bar Low pressure increase up to fully opene valve Low hysteresis of only approx.. bar Opening pressure ifference: DHV appr.. bar DHV appr.. bar DHV appr.. bar Great operating security an long service life steay low vibration controlling hermetically seale by iaphragm with crimpe O-rings low maintenance easiest installation acc. ASV moular esign system variable installation inepenent of flow irection pressure settings at any time, also uring operation High-quality materials, or boy, natural on request -coate iaphragm on flui sie safe mounting with stainless steel bolts Easy connection to the pipeline threae necks acc. DIN complete with union nuts, O-ring sealings an inserts raial emountability even after mounting spigot ens for solvent or fusion weling acc. ISO/DIN *DIBt = German institute for structural engineering

2 Constructional features High reproucibility. Short face-to-face imension. Injection moule threae necks acc. to DIN. Direct mounting on any valve support by metal inserts in the boy. The movability of the union nuts is not effecte. Range of application Directly controlle by the operating flui the DHV is use in all technical processes where a constant working an system pressure is require on the primary sie an for avoiing any unesire pressure increase. The DHV can also be use as overflow valve. For this purpose the DHV is to be mounte at the place where a T-piece is installe in the pipeline. Valve functions an esign Normally the valve is close an the piston respectively the valve seat is only amitte to the seconary pressure. Any rise of working or inlet pressure (primary sie) above the preset pressure value activates the iaphragm an lifts the piston against the spring force. The valve opens an the pressure rops own in the seconary pipeline. The moule iaphragm constructe for full opening of the valve separates the flui in the lower boy from the bonnet respectively the atmosphere. The seale tightness especially at higher temperature is secure by crimpe seal O-rings at the iaphragm. Valve setting an ajustment The presetting or reajustment is mae by removing the protection cap at setting control screw with a counternut an by reaing the set pressure from the ASV iaphragm pressure gauge guar type in the pipe system. The counternut can be leae. Pressure relief valve with pressure gauge For neutral fluis the valve can be equippe with a gauge, normally at the primary sie. Sectional rawing DHV seconary sie DIBt-approval Z-.- Z-.- Z-.- pressure gauge cap control screw counter nut iaphragm piston seat seal valve seat primary sie DHV with pressure gauge G /"

3 Material Only thermoplastic material with high impact strength an high creep strength is use by ASV. Valve boy, piston, separation isc (Polyvinyl chlorie) (Polypropylene) (Polyvinyliene fluorie) Valve bonnet glass-fiber reinforce Moule iaphragm, -coate on flui sie Valve seat seal O-Rings at union ens Connecting screws Stainless steel. (AISI / BS S ) Technical ata Fluis Technically clean, neutral or aggressive liquis provie that the selecte materials are resistant at operating temperature. Refer to the ASV resistance guie. Installation Variable, inepenent of flow irection. Direction of flow Direction of flow always in irection of arrow. Pressure range PN at + C Operating pressure See material pressure/temperature iagram. Working pressure Set pressure plus flow epenent pressure increase (see characteristic curves): appr.. up to. bar Opening pressure ifference DHV approx.. bar DHV approx.. bar DHV approx.. bar Hysteresis Difference between opening an closing pressure: appr.. bar Meia temperature Depens on the operating conitions (system pressure, loa etc.). Taking creep strength into account, the following approximate temperatures apply: : + C : + C : + C Colour Boy: grey, RAL grey, RAL opaque (yellowish white) Bonnet: -GFR orange, RAL Pressure/temperature iagram The values are a guie for harmless fluis (DIN ) the material of the valve is resistant against. The pressure/temperature limits are applicable for a compute operating life factor of years at PN. Durabiltity of wear an tear parts is epening on the operating conitions of the application. Values < C ( < + C) on request with exact ata of operation. Pressure-temperature iagram pressure (bar) Connection. Boy with threae necks acc. to DIN complete with: union nuts mae of, or union socket ens mae of, or O-ring sealings mae of or On request we eliver: union spigot ens for fusion weling mae of or PE imensions acc. BS, ANSI an JIS on request. Boy with spigot ens for solvent or fusion weling acc. ISO/DIN on request. upvc - - temperature C

4 Dimensions DHV, DHV an DHV with union sockets D h ±. H view A A l ±. z ±. L ±. DHV an DHV with union sockets Size L l Dimensions z h H D M s Weight kg (stanar value) * * * / / / DHV with union sockets Size Dimensions L l z h H D M s Weight kg (stanar value) * * *,.. /,..,..,.. /,.. /,..,.. * also vali for

5 Dimensions DHV, DHV an DHV with spigot ens D h ±. H view A S A l L M DHV an DHV with spigot ens Size L l Dimensions h H D M s Weight kg (stanar value) * ±. ±. ±.... / ±. ±. ±.... ±. ±. ±.... ±. ±. ±.... / ±. ±. ±.... / ±. ±. ±.... ±. ±. ±.... DHV with spigot ens Size L l Dimensions h H D M s Weight kg (stanar value) * ±. ±. ±.... / ±. ±. ±.... ±. ±. ±.... ±. ±. ±.... / ±. ±. ±.... / ±. ±. ±.... ±. ±. ±.... * vali also for

6 Ient No. DHV with union sockets Boy Diaphragm Sealing Setting range (bar) / / / Ient No. DHV with union sockets Boy Diaphragm Sealing Setting range (bar) / / / Ient No. DHV with union sockets. Boy Diaphragm Sealing Setting range (bar) / / /

7 Ient No. DHV with spigot ens Boy Diaphragm Sealing Setting range (bar) / / / Ient No. DHV with spigot ens Boy Diaphragm Sealing Setting range (bar) / / / Ient No. DHV with spigot ens Boy Diaphragm Sealing Setting range (bar) / / /

Spare part list Item Description Quantity DHV / valve boy bonnet separation isc pressure isc iaphragm* pressure plate spring plate spring steel ball piston* piston top* flat isc* hexagonal bolt*

valve boy bonnet. spring nut. ajustment screw. hexagonal nut. cap nut. axial bearing isc. axial neele roller*. clamping sleeve.

8 Spare part list Item Description Quantity DHV / valve boy bonnet separation isc pressure isc iaphragm* pressure plate spring plate spring steel ball piston* piston top* flat isc* hexagonal bolt* steel ball/centering isc ) hexagonal bolt hexagonal nut O-ring* protection cap hexagonal bolt hexagonal bolt hexagonal nut U-washer insert union nut protection cap protection cap U-washer plug DHV valve boy bonnet. spring nut. ajustment screw. hexagonal nut. cap nut. axial bearing isc. axial neele roller*. clamping sleeve. hexagonal nut separation isc pressure isc iaphragm* spring plate spring piston* piston top* flat isc* hexagonal bolt* steel ball/centering isc ) O-ring* protection cap hexagonal bolt hexagonal bolt hexagonal nut U-washer insert union nut protection cap protection cap U-washer protection plug All parts marke with * are inclue in the respective wear an tear part set. In case of spare part orer please state complete valve ient No. an serial No. ) from with centering isc

9 Characteristic curves The valve curves show the primary pressure or working pressure p A in bar in relation to the flow Q in l/h. The parameter is the set pressure p E at Q = l/h. The curve shows the progression of the opening pressure. The curves are vali for water at C. Example: DHV, size The valve is set close at bar. At a pressure increase of bar the flow of about l/h is reache. Working pressure p A appr.. bar Closing pressure p S appr.. bar Opening pressure p Ö appr.. bar Set pressure p E appr.. bar working pressure p A (bar) DHV DHV DHV working pressure p A (bar) DHV DHV DHV working pressure p A (bar) DHV DHV DHV working pressure p A (bar) DHV DHV DHV working pressure p A (bar) DHV DHV DHV

10 Characteristic curves working pressure p A (bar) DHV DHV DHV working pressure p A (bar) DHV DHV DHV Pressure loss curves DHV / / k V l/h = pressure loss p (bar)... /. (H O = C)

11 < < < < Application of pressure relief valve. Constant system pressure. Consumer an/or open, valve closes p A p A p Ö p Ö valve opens valve close p A p A p Ö p Ö valve opens valve close p Ö p Ö. DHV // as non-return valve. Container is locate above the pump.. DHV // as overflow valve. Pressure of container or application system shoul not excee the max. pressure value. p Ö p max p A p Ö p A p max p Ö p Ö p Ö valve opens valve close p Ö p Ö p Ö valve opens valve close p A = working pressure = pressure of pump p Ö = opening pressure Failure, possible cause an repair Failure Possible cause Repair Valve leaking at iaphragm. Diaphragm clamping pressure too low. Fasten screws ( an ). Pressure rops below set pressure. Pressure rises above set pressure. Valve is leaking at setting control screw. Pistonguie or valve seat leaking. Diaphragm () leaking. Pistonguie is jae or irty. Diaphragm amage. Pressure plate clamping pressure too low. Piston or seat seal to be checke. Replace if necessary. Diaphragm to be replace. Valve to be cleane. Replace iaphragm. Fasten screw ().

12 Operating instructions Safe operation of the valve can only be ensure! if it is properly installe, operate, service or repaire by qualifie personnel accoring to its intene use while observing the accient prevention regulations, safety regulations, stanars an technical regulations. The intene use inclues ahering to the specifie limit values for pressure an temperature as well as the chemical resistance referring to the operating conitions. For this purpose, ensure that all components getting in contact with the meia are "resistant" in accorance with the ASV resistance guie. The owner/user must inform the authorize qualifie personnel instructe to perform the assembly, inspection an/or maintenance work of any potential anger emanating from the machine line/meium, an ensure that suitable safety measures are observe incluing local regulations an laws of the territories of use. Non-observance of the specifie information an safety instructions may lea to injuries an/or property amages. Installation Depening on the type of connection the pipe ens have to be properly prepare acc. to all technical stanars. Valve to be raially installe acc. to all technical stanars between the pipe ens. In case of flange connections the torques of the screws to fasten the flanges have to be observe. After proper installation the pipe system with all components has to be teste for leakages. Disassembly Note Ahere to the operating instructions. If require protection clothes must be worn. The pipe section is to be shut-off an to be emptie. Ensure a safe pressure release. Any flui rest is to be ispose properly.. Valve bonnet.. Position the valve upright...remove cap ()...Loosen hexagonal nut (/.) an hexagonal bolt/ajustment screw (/.) so far until the spring () is totally release...remove housing bolts (, ) from boy () an bonnet ()...Bonnet () to be pulle off upwars. Remove spring (), spring plate () an steel ball/centering isc().. Valve boy an iaphragm.. Perform the isassembly as alreay escribe uner point... Pull off piston (), pressure isc () with iaphragm (), hexagonal bolt (), flat isc () an piston top () out of the boy ()...Carefully fix the piston, turn off piston top (). Loosen bolt (), pressure isc () with iaphragm () an flat isc (). Assembly In the reverse orer to isassembly. Diaphragm, valve seat, O-ring sealings to be checke for amages, imension eviations, shore harness etc. Replace if necessary. Screw torque (lubricate screws): / Nm / Nm // Nm Note Consier tightening torque for mounting of pressure gauge: max. Nm Note Elastomeres, especially the sealing elements, shoul not be touche or cleane with synthetic oils, mineral oils, fats or cleaning agents. Danger of swelling. Only appropriate fats shoul be use, e.g. silicone greases. We recoen: Installing of filter or strainer (see print ) irectly before the valve for avoiing impurities e.g. at valve seat. Technical alterations excepte ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Telepone + () - Fax + () contact@asv-stuebbe.e

ASV sturdy and robust construction. DN 10 up to DN bar (PN 10) at 20 C. DMV 755: 1,0-9,0 bar DMV 765: 0,5-9,0 bar

ASV sturdy and robust construction. DN 10 up to DN bar (PN 10) at 20 C. DMV 755: 1,0-9,0 bar DMV 765: 0,5-9,0 bar Pressure Reucing Valve Type DMV Type DMV Print-No. / Design Size Max. Pressure Setting Range Pressure Setting Working Pressure Back lash Operating Security Maintenance Simple inline pipe connection ASV