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

Transcription

1 ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Fon + (). - Fax + (). - contact@asv-stuebbe.de Pressure Relief Valve Overflow Valve Type DHV Type DHV Type DHV High repeating accuracy, with union sockets or spigot ends The optimal monitoring valves Great operating security and long service life High-quality materials Easy connection to the pipeline DIBt* approved Sizes up to Operating pressure up to bar (PN ) Wide set range: DHV :. -. bar DHV :. -. bar DHV :. -. bar Low pressure increase up to fully opened valve Low hysteresis of only approx.. bar Opening pressure difference: DHV appr.. bar DHV appr.. bar DHV appr.. bar steady low vibration controlling hermetically sealed by diaphragm with crimped O-rings low maintenance easiest installation acc. ASV modular design system variable installation independent of flow direction pressure settings at any time, also during operation, or body, natural on request -coated diaphragm on fluid side safe mounting with stainless steel bolts DIBt* approved threaded necks acc. DIN completed with union nuts, O-ring sealings and inserts radial demountability even after mounting spigot ends for solvent or fusion welding acc. ISO/DIN //

2 Constructional features High reproducibility. Short face-to-face dimension. Injection moulded threaded necks acc. to DIN. Direct mounting on any valve support by metal inserts in the body. The movability of the union nuts is not effected. Range of application Directly controlled by the operating fluid the DHV is used in all technical processes where a constant working and system pressure is required on the primary side and for avoiding any undesired pressure increase. The DHV can also be used as overflow valve. For this purpose the DHV is to be mounted in by-pass lines. Valve functions and design Normally the valve is closed and the piston respectively the valve seat is only admitted to the secondary pressure, if existing. Any rise of working or inlet pressure (primary side) above the pre-set pressure value activates the diaphragm and lifts the piston against the spring force. The valve opens and the pressure drops down in the secondary pipeline. The moulded diaphragm constructed for full opening of the valve separates the fluid in the lower body from the bonnet respectively the atmosphere. The sealed tightness especially at higher temperature is secured by crimped seal O-rings at the diaphragm. Valve setting and adjustment The presetting or readjustment is made by removing the protection cap at setting control screw with a counternut and by reading the set pressure from the ASV diaphragm pressure gauge guard type in the pipe system. The counternut can be leaded. Pressure relief valve with pressure gauge The valve can be equipped with a gauge, normally at the primary side. (Adhere to the ASV resistance guide.) Sectional drawing DHV secondary side DIBt-approval Z-.- Z-.- Z-.- pressure gauge G /" cap control screw counter nut diaphragm piston seat seal valve seat primary side DHV with pressure gauge ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Fon + (). - Fax + (). - contact@asv-stuebbe.de //

3 ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Fon + (). - Fax + (). - contact@asv-stuebbe.de Material Only thermoplastic material with high impact strength and high creep strength is used by ASV. Valve body, piston, separation disc (Polyvinyl chloride) (Polypropylene) (Polyvinylidene fluoride) Valve bonnet glass-fiber reinforced Moulded diaphragm, -coated on fluid side Valve seat seal O-Rings at union ends Connecting screws Stainless steel. (AISI / BS S ) Technical data Fluids Technically clean, neutral or aggressive liquids provided that the selected materials are resistant at operating temperature. Refer to the ASV resistance guide. Installation Variable, independent of flow direction. Direction of flow Direction of flow always in direction of arrow. Pressure range PN at + C Operating pressure See material pressure/temperature diagram. Working pressure Set pressure plus flow dependent pressure increase (see characteristic curves): appr.. up to. bar Opening pressure difference DHV approx.. bar DHV approx.. bar DHV approx.. bar Hysteresis Difference between opening and closing pressure: appr.. bar Media temperature Depends on the operating conditions (system pressure, load etc.). Taking creep strength into account, the following approximate temperatures apply: : + C : + C : + C Colour Body: grey, RAL grey, RAL opaque (yellowish white) Bonnet: -GFR orange, RAL Pressure/temperature diagram The values are a guide for harmless fluids (DIN ) the material of the valve is resistant against. The pressure/temperature limits are applicable for a computed operating life factor of years at PN. Durabiltity of wear and tear parts is depending on the operating conditions of the application. Values < C ( < + C) on request with exact data of operation. Pressure-temperature diagram pressure (bar) - - Connection. Body with threaded necks acc. to DIN completed with: union nuts made of, or union socket ends made of, or O-ring sealings made of or On request we deliver: union spigot ends for fusion welding made of or PE dimensions acc. BS, ANSI and JIS on request. Body with spigot ends for solvent or fusion welding acc. ISO/DIN on request. temperature C upvc //

4 Dimensions DHV, DHV and DHV with union sockets DHV and DHV with union sockets Size d Size d Dimensions L l z h inch * * * / / / / / DHV with union sockets * also valid for D A l ±. z ±. L ±. d h ±. H Dimensions L l z inch * * / / / / / h * H H D D view A M M M M M M M M s s Weight kg (standard value) ,,,,,,, Weight kg (standard value) ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Fon + (). - Fax + (). - contact@asv-stuebbe.de //

5 ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Fon + (). - Fax + (). - contact@asv-stuebbe.de Dimensions DHV, DHV and DHV with spigot ends L DHV and DHV with spigot ends Size Dimensions d * valid also for D A l d h ±. H L l h inch * ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. DHV with spigot ends Size Dimensions d / / / / / L l h inch * / / / / / ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. ±. H H D D view A M M s M M M M s M M M Weight kg (standard value) S Weight kg (standard value) //

6 Ident No. DHV with union sockets Body Diaphragm Sealing Setting range (bar). -. d inch / / / / / Ident No. DHV with union sockets Body Diaphragm Sealing Setting range (bar). - d inch / / / / / Ident No. DHV with union sockets Body Diaphragm Sealing Setting range (bar) d. - inch / / / / / ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Fon + (). - Fax + (). - contact@asv-stuebbe.de //

7 ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Fon + (). - Fax + (). - contact@asv-stuebbe.de Ident No. DHV with spigot ends Body Diaphragm Sealing Setting range (bar). -. d inch / / / / / Ident No. DHV with spigot ends Body Diaphragm Sealing Setting range (bar). - d inch / / / / / Ident No. DHV with spigot ends Body Diaphragm Sealing Setting range (bar). - d inch / / / / / //

8 Spare part list All parts marked with * are included in the respective wear and tear part set. In case of spare part order please state complete valve ident No. and serial No. Item Description Quantity DHV / valve body bonnet separation disc pressure disc diaphragm* pressure plate spring plate spring steel ball piston* piston top* flat disc* hexagonal bolt* steel ball/centering disc ) 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 body bonnet. spring nut. adjustment screw. hexagonal nut. cap nut. axial bearing disc. axial needle roller*. clamping sleeve. hexagonal nut separation disc pressure disc diaphragm* spring plate spring piston* piston top* flat disc* hexagonal bolt* steel ball/centering disc ) O-ring* protection cap hexagonal bolt hexagonal bolt hexagonal nut U-washer insert union nut protection cap protection cap U-washer protection plug ) from with centering disc ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Fon + (). - Fax + (). - contact@asv-stuebbe.de //

9 ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Fon + (). - Fax + (). - contact@asv-stuebbe.de 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 valid for water at C. Example: DHV, size The valve is set closed at bar. At a pressure increase of bar the flow of about l/h is reached. 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) working pressure p A (bar) DHV DHV DHV DHV DHV DHV working pressure p A (bar) working pressure p A (bar) working pressure p A (bar) DHV DHV DHV DHV DHV DHV DHV DHV DHV //

10 Characteristic curves working pressure p A (bar) pressure loss p (bar) DHV DHV DHV working pressure p A (bar) DHV DHV DHV Pressure loss curves DHV / / k V l/h = / (H O = C) ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Fon + (). - Fax + (). - contact@asv-stuebbe.de //

11 < < < < ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Fon + (). - Fax + (). - contact@asv-stuebbe.de Application of pressure relief valve. Constant system pressure. Consumer and/or open, valve closes p A. DHV // as non-return valve. Container is located above the pump. p max p Ö Failure, possible cause and repair p Ö p A = working pressure = pressure of pump p Ö = opening pressure Failure Valve leaking at diaphragm. Pressure drops below set pressure. Pressure rises above set pressure. Valve is leaking at setting control screw. p A p Ö p Ö p Ö p max p Ö p Ö valve opens valve closed valve opens valve closed Possible cause Diaphragm clamping pressure too low. p A p A. DHV // as overflow valve. Pressure of container or application system should not exceed the max. pressure value. Pistonguide or valve seat leaking. Diaphragm () leaking. Pistonguide is jaed or dirty. Diaphragm damaged. Pressure plate clamping pressure too low. p A p Ö Repair p Ö Fasten screws ( and ). Piston or seat seal to be checked. Replace if necessary. Diaphragm to be replaced. Valve to be cleaned. Replace diaphragm. Fasten screw (). p Ö valve opens p Ö valve closed p Ö p A p Ö valve opens p Ö valve closed //

12 Operating instructions Safe operation of the valve can only be ensured! if it is properly installed, operated, serviced or repaired by qualified personnel according to its intended use while observing the accident prevention regulations, safety regulations, standards and technical regulations. The intended use includes adhering to the specified limit values for pressure and temperature as well as the chemical resistance referring to the operating conditions. For this purpose, ensure that all components getting in contact with the media are "resistant" in accordance with the ASV resistance guide. The owner/user must inform the authorized qualified personnel instructed to perform the assembly, inspection and/or maintenance work of any potential danger emanating from the machine line/medium, and ensure that suitable safety measures are observed including local regulations and laws of the territories of use. Non-observance of the specified information and safety instructions may lead to injuries and/or property damages. Installation Depending on the type of connection the pipe ends have to be properly prepared acc. to all technical standards. Valve to be radially installed acc. to all technical standards between the pipe ends. In case of flange connections the torques of the screws to fasten the flanges have to be observed. After proper installation the pipe system with all components has to be tested for leakages. Disassembly Note Adhere to the operating instructions. If required protection clothes must be worn. The pipe section is to be shut-off and to be emptied. Ensure a safe pressure release. Any fluid rest is to be disposed properly.. Valve bonnet.. Position the valve upright...remove cap ()...Loosen hexagonal nut (/.) and hexagonal bolt/adjustment screw (/.) so far until the spring () is totally released...remove housing bolts (, ) from body () and bonnet ()...Bonnet () to be pulled off upwards. Remove spring (), spring plate () and steel ball/centering disc().. Valve body and diaphragm.. Perform the disassembly as already described under point... Pull off piston (), pressure disc () with diaphragm (), hexagonal bolt (), flat disc () and piston top () out of the body ()...Carefully fix the piston, turn off piston top (). Loosen bolt (), pressure disc () with diaphragm () and flat disc (). Assembly In the reverse order to disassembly. Diaphragm, valve seat, O-ring sealings to be checked for damages, dimension deviations, shore hardness etc. Replace if necessary. Screw torque (lubricated screws): / Nm / Nm // Nm Note Consider tightening torque for mounting of pressure gauge: max. Nm Note Elastomeres, especially the sealing elements, should not be touched or cleaned with synthetic oils, mineral oils, fats or cleaning agents. Danger of swelling. Only appropriate fats should be used, e.g. silicone greases. We recoend: Installing of filter or strainer (see print ) directly before the valve for avoiding impurities e.g. at valve seat. Technical alterations excepted ASV Stübbe GmbH & Co. KG Hollwieser Straße D- Vlotho Fon + (). - Fax + (). - contact@asv-stuebbe.de //