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 stury an robust construction up to (PN ) at C DMV :, -, DMV :, -, At any time also uring operation Corresponing to relate material an temperature: DMV : up to, DMV : up to, Low pressure increase up to full seat opening High reproucibility Low hysteresis of only approx., -, Hermetically seale by iaphragm with crimpe O-ring Soli, vibration an fluttering free pressure control Maintenance free Because of injection moule union threa complete with union nut an inlay accoring to DIN. Also ANSI, JIS, BSP inlays available Also with solvent or weling spigot ens
Because of constructive esign the valves DMV / have the following features: High reproucibility. Short compact imensions. With spigot ens or injection moule threae necks acc. to DIN an union socket ens. Direct mounting on any valve support by metal inserts below the boy. Range of applications: Sectional View DMV Protection cap Control screw Counternut Directly controlle by the operating flui the DMV / reuces the primary pressure an keeps the operating pressure constant. Valve functions an esign: The ASV valve DMV / is in working conition always open which means it is balance between primary an seconary pressure. At any rise of working pressure - valve outlet - a pressure compensation takes place at the area below the iaphragm (control bore). The higher working pressure activates the large iaphragm an lifts the piston against the spring force. The flow reuces an the working pressure rops own until balance conition is reache again. When the working pressure rops the escribe proceure reverses. The spring force opens the valve seat against the lower pressure force below the iaphragm. The flow rises until the balance conition is reache again. Attention: If the seconary pressure is aitionally increase by the back pressure, the pressure reucing valve works as a nonreturn valve. This pressure can lea to the estruction of the valve piston. 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. Seconary sie Pressure reucing valve with pressure gauge: For neutral fluis the valve can be equippe with a gauge either at the primary or also at the seconary sie. Flow Diagram: See at page. Diaphragm Piston Seat seal Valve seat Primary sie Pressure reucing valve with pressure gauge G /"
Material Only thermoplastic material with high impact strength an high creep strength is use by ASV Stübbe. Valve boy, piston, separation isc: (Polyvinyl Chlorie) (Polypropylene) (Polyvinyliene Fluorie) Valve bonnet: glass-fiber reinforce Moule iaphragm: EPDM, PTFE coate on flui sie Valve seat seal: EPDM FPM O-ring sealings at union ens: EPDM FPM Screws, nuts an washers: SS (AISI ) Technical Data Type of fluis: Neutral, aggressive or gaseous liquis provie that the selecte materials are resistant at operating temperature. Refer to the ASV resistance guie. Installation: Arrow of flow irection must always be consiere. Flui temperature: Depens on the operating conitions (system pressure, loa etc.). Taking creep strength into account, the following approximate temperatures apply: : + C : + C : + C Colour of boy: grey, RAL grey, RAL opaque (yellowish white) Colour of bonnet: orange, RAL Pressure/temperature-iagram: The pressure/temperature limits are applicable for a compute operating life factor of years. The values are a guie for harmless fluis (DIN ) against which the material of the valve is resistant. The curves are vali for a calculate lifetime of about. Values < C ( < + C) on request with exact ata of operation. Pressure/temperature iagram Connection:. Boy with union threa acc. DIN complete with: union nuts mae of, or inserts with socket ens out of, or O-ring sealings in EPDM or FPM On request we eliver: inserts with 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 We kinly ask for your inquiry. Nominal pressure: PN at + C. Operating pressure: See material epenent pressure/ temperature-iagram. Working pressure: DMV :, -, Pressure DMV :, -, Hysteresis: Difference between opening an closing pressure: approx., -, - - Temperature C
Dimensions DMV, DMV with union socket ens D H View A S h ±, PVC l ±, z ±, A M L ±, For DMV with union socket ens Size Dimensions L l z h PVC PVC* PVC* PVC* H D M s Weight (kg) (stanar value) PVC / M,,, / / M M,,,,,, M,,, / M,,, / M,,, M,,, For DMV with union socket ens Size Dimensions L l z h PVC PVC* PVC* PVC* H D M s Weight (kg) (stanar value) PVC / M,,, / M,,, / M,,, M,,, / / M M,,,,,, M,,, *vali also for
Dimensions DMV, DMV with spigot ens D H View A h ±, S l ±, A z ±, L ±, M For DMV with spigot ens Size Dimensions Weight kg (appr.) L l h * H D M s / ± ±, ±, M,,, / ± ±, ±, M,,, / ± ±, ±, M,,, ± ±, ±, M,,, / ±, ±, ±, M,,, / ±, ±, ±, M,,, ±, ±, ±, M,,, For DMV with spigot ens Size Dimensions Weight kg (appr.) L l h * H D M s / ± ±, ±, M,,, / ± ±, ±, M,,, / ± ±, ±, M,,, ± ±, ±, M,,, / ±, ±, ±, M,,, / ±, ±, ±, M,,, ±, ±, ±, M,,, *vali also for
for type DMV with union socket ens Housing Diaphragm/Seal Set Range (), -,, -,, -,, -,, -,, -, / / / / / for type DMV with spigot ens Housing Diaphragm/Seal Set Range (), -,, -,, -,, -,, -,, -, / / / / / for type DMV with union socket ens Housing Diaphragm/Seal Set Range (), -,, -,, -,, -,, -,, -, / / / / / for Type DMV with spigot ens Housing Diaphragm/Seal Set Range (), -,, -,, -,, -,, -,, -, / / / / /
Spare Part List DMV View A View A Pos. Description Valve Boy Bonnet Separation Disc * Spring Plate Diaphragm * Pressure Plate Washer Spring Steel Ball O-ring sealing * O-ring sealing * Piston * O-ring sealing* Hex.-Screw Hex.-Screw Counter Nut O-ring sealing* Protection Cap Qty. Pos. Description Hex.-Screw Hex.-Screw Hex.-Nut Washer Socket Union Nut Protection Cap Protection Cap O-ring sealing * Pistonguie * Flat Seal * Washer Cap Nut Spring owel sleeve Counternut Spinn Pressure Plate Bearing * Qty. / / / / / * Spare parts
Characteristic Curves DMV Working pressure p A above the flow Q l/h. Parameter is set pressure p E at Q = l/h. The curves are vali for water at + C. The respective top an lower curve show the reseat respectively opening pressure progression.
Characteristic Curves DMV Working pressure p A above the flow Q l/h. Parameter is set pressure p E at Q = l/h. The curves are vali for water at + C. The respective top an lower curve show the reseat respectively opening pressure progression.
Operation conitions: p E = Set pressure p A = Working pressure p S = Closing pressure p A = p S = Opening pressure p S - = Hysteresis p E - p A = Flow epening pressure reuction p E p S Q Hysteresis
Application of Pressure Reucing Valve Working conition If shut-off valve opens the working pressure p A rops by an opening pressure DMV e. g. to keep tank on constant reuce pressure Shut-off valve close p A Primary pressure Seconary pressure Working conition If shut-off valve closes the working pressure p A rises by the a closing pressure p S DMV p A necessary control or pressureless by respective pipelength or other comonents Shut-off valve open Primary pressure Seconary pressure Failures, possible Causes an Repair Failures Possible causes Repair Valve at iaphragm leaking. Diaphragm clamping pressure too low. Fasten screw (pos., pos. ). Pressure rises above set pressure. O-ring sealing amage. Seat seal leaking. O-ring sealing (pos. ) to be replace. Seat seal (pos. ) to be replace. Diaphragm leaking. Diaphragm (pos. ) to be replace. O-ring sealing leaking. O-ring sealing (pos., an pos., ) to be replace. Control bore at boy an/or separation isc irty. Dismount valve an clean bore. Pistonguie is jae or irty. Valve to be cleane. Valve close (oes not open). Valve mounte in wrong irection. Turn valve in irection of arrows. Valve is leaking at control screw. Diaphragm amage. Replace iaphragm (Pos. ).
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 to 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 for 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: Observe the operating Note instructions. I require protection clothes must be worn. The pipe section is to be shut-off an to be emptie. Any flui rest is to be ispose properly.. Valve bonnet:. Position the valve upright.. Remove cap ().. Loosen counter nut () an setting control screw (), for DMV ( an ), so far that the spring () in the bonnet is totally release... Remove housing bolts an nuts (, ) from valve boy () an bonnet ()... Bonnet () to be lifte upwars. Remove spring (), pressure plate () an steel ball (), for DMV only the spring ().. Valve boy an iaphragm.. Disassembly of bonnet the same way as from. to.... Spring plate () with piston (), iaphragm (), separation isc (), flat seal () an pistonguie () to be pulle out of the valve boy (). Remove the O-rings (, an ) with a blunt tool.. Loosen srew (pos. ) an remove pistonguie (pos. ). Release screw (pos. ) out of piston (pos. ). Remove flat seal (pos. ). Piston (pos. ) to be lifte upwars. Remove O-ring sealing out of separation isc with a blunt tool. Secure iaphragm (pos. ).. Assembly In the reverse orer to isassembly. Check by assembling Note the correct position of the separation-isc-bore an the control-bore. Diaphragm, flat seals, O-ring sealings to be checke for amages an imension eviations. Shore harness to be checke. Replace if necessary. Screw torque: M an M : appr. Nm Elastomeres, especially Note the EPDM 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 No. ) irectly before valve for avoiing impurities e.g. at valve seat. Technical alterations excepte ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Telephone () - Telefax () - http://www.asv-stuebbe.e e-mail: info@asv-stuebbe.e