Pressure Relief Valve DHV 718 asv-stuebbe.de Ł contact@asv ...the check of the chemical resistance....
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1 ASV Stübbe GmbH & Co. KG Hollwieser Strae 5 D-32602 Vlotho Fon +49 (0) 57 33.7 99-0 Fax +49 (0) 57 33.7 99-2 20 www.asv-stuebbe.de [email protected] Advantages frictionless components low maintenance low pressure increase up to fully opened valve constant low vibration controlling hermetically sealed by diaphragm for oscillating pumps for viscous media even slightly polluted Application chemical plants water treatment galvanotechnics Utilisation as pressure relief valve; constant working or primary pressure as overflow valve; opens in case of exceeding the set opening pressure Type of fluids Neutral and aggressive fluids even with few solid particles provided that the components getting in contact with the medium are resistant at operating temperature according to the ASV resistance guide. Examinations Requirements and examinations acc. to DIN 3441, 3442, 8063, 16962/3. Nominal pressure (H2O, 20C) PN 10 Media temperature see pressure/temperature diagram Operating pressure see pressure/temperature diagram Set range 0,5 - 10 bar Opening pressure DN 8 0,5 bar DN 10 - 50 0,3 bar Hysteresis ≤ 0,5 bar Size DN 8 - DN 50 Housing DN 8 PVC-U, PP or PVDF DN 10 - 50 PVC-U, PP or SS 1.4571 Bonnet (spring housing) PP, glass fibre reinforced Diaphragm EPDM, fabric reinforced and PTFE-coated on fluid side Adjustment and connecting screws SS 1.4301 Connection DN 8 union DIN 8063 with socket ends for solvent or fusion welding acc. to DIN/ISO DN 10 - 50 spigot ends for solvent or fusion welding acc. to DIN/ISO DN 10 - 50 socket end with pipe thread or NPT thread Mounting variable, bonnet preferably in upright position Flow direction direction of flow always in direction of arrow Fastening thread inserts for easiest mounting Colour housing PVC-U: grey, RAL 7011 PP: grey, RAL 7032 PVDF: opaque, yellowish-white bonnet orange, RAL 2004 Pressure Relief Valve DHV 718 optimized design, safe in function 330451 2007/06/26
Transcript of Pressure Relief Valve DHV 718 asv-stuebbe.de Ł contact@asv ...the check of the chemical resistance....
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Advantages� frictionless components� low maintenance� low pressure increase up to fully opened valve� constant low vibration controlling� hermetically sealed by diaphragm� for oscillating pumps� for viscous media even slightly polluted
Application� chemical plants� water treatment� galvanotechnics
Utilisation� as pressure relief valve; constant working or
primary pressure� as overflow valve; opens in case of exceeding the
set opening pressure
Type of fluids� Neutral and aggressive fluids even with few solid
particles provided that the components getting incontact with the medium are resistant atoperating temperature according to the ASVresistance guide.
Examinations� Requirements and examinations acc. to DIN 3441,
3442, 8063, 16962/3.
Nominal pressure (H2O, 20°C)� PN 10
Media temperature� see pressure/temperature diagram
Operating pressure� see pressure/temperature diagram
Set range� 0,5 - 10 bar
Opening pressure� DN 8 0,5 bar� DN 10 - 50 0,3 bar
Hysteresis� ≤ 0,5 bar
Size� DN 8 - DN 50
Housing� DN 8 PVC-U, PP or PVDF� DN 10 - 50 PVC-U, PP or SS 1.4571
Bonnet (spring housing)� PP, glass fibre reinforced
Diaphragm� EPDM, fabric reinforced and PTFE-coated on
fluid side
Adjustment and connecting screws� SS 1.4301
Connection� DN 8 union DIN 8063 with socket ends for
solvent or fusion welding acc. toDIN/ISO
� DN 10 - 50 spigot ends for solvent or fusionwelding acc. to DIN/ISO
� DN 10 - 50 socket end with pipe thread orNPT thread
Mounting� variable, bonnet preferably in upright position
Flow direction� direction of flow always in direction of arrow
Fastening� thread inserts for easiest mounting
Colour� housing PVC-U: grey, RAL 7011
PP: grey, RAL 7032PVDF: opaque, yellowish-white
� bonnet orange, RAL 2004
Pressure Relief Valve DHV 718optimized design, safe in function
330451 2007/06/26
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330451 2007/06/26
Sectional drawing DHV 718, DN 8
Sectional drawing DHV 718, DN 10 - DN 50
Function and designNormally the valve is closed and the diaphragm isonly loaded by the low secondary pressure at thevalve seat.Any rise of working or primary pressure lifts thediaphragm against the spring force. The valve opensand the pressure decreases.The flat diaphragm, constructed for full opening of thevalve (D/4), safely separates the fluid from the springhousing.The only components getting in contact with themedium are the PTFE-coated diaphragm and the valvehousing.In normal position the diaphragm seats on the welldimensioned valve seat. An inadmissible compressionset at max. spring force is impossible.The valve housing is provided with a cavity. Thediaphragm has the appropriate design and is insertedinto the cavity. At compression due to the screwtightening torques there is no leakage, even at highertemperatures.
In normal position the counter pressure (secondarypressure) may be approximately 4 times higher thanthe set pressure pE, the valve rests closed.
Valve settingFor reading the set pressure we recommend theinstallation of a diaphragm pressure gauge guard withpressure gauge in the primary line.1. Pull off protection cap (DN 10 - DN 50).2. Loosen counter nut at adjustment screw.3. Turn adjustment screw clockwise (pressure
increase) until the required set pressure oropening pressure is reached.
Pressure Relief Valve DHV 718
Note
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Pressure Relief Valve DHV 718
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Pressure/temperature diagram
temperature (°C)
pre
ssure
(bar)
The pressure/temperature limits are applicable for acomputed operating life factor of 25 years at PN 10.The values are a guide for harmless fluids (DIN 2403)the material of the valve is resistant against.For other media see the ASV resistance guide.Durability of wear and tear parts is depending on theoperating conditions of the application.Values below 0 °C (PP < +10 °C) on request withexact data of operation.
Operating instructions
Safe operation of the valve can only be ensured if itis properly installed, operated, serviced or repairedby qualified personnel according to its intended usewhile observing the accident prevention regulations,safety regulations, relevant standards and technicalregulations or data sheets like DIN, DIN EN, DIN ISOand DVS* for example.The intended use includes adhering to the specifiedlimit values for pressure and temperature as well asthe check of the chemical resistance.For this purpose, ensure that all components gettingin contact with the media are "resistant" inaccordance with the ASV resistance guide.The owner/user must inform the authorized qualifiedpersonnel instructed to perform the assembly,inspection and/or maintenance work of any potentialdanger emanating from the machine line/medium, andensure that suitable safety measures are observed.This includes also the consideration of localregulations and laws of the territories of use.If the authorized qualified personnel does not haveany operating and maintenance instruction this is tobe requested prior installation, maintenance or repair.Non-observance of the specified information andsafety instructions may lead to injuries and/orproperty damages.
Values:kv[l/min]cv[gal/min] USfv [gal/min] GB
Pressure loss curve(standard values for H2O, 20°C)
flow Q (l/h)
pre
ssure
loss
Δp (
bar)
Pressure loss and kv-valueThe diagram shows the pressure loss Δp over theflow Q.
For calculation:cv= kv � 0,07fv = kv � 0,0585
At certain intervals the tightening torques at thehousing screws should be checked.Admissible tightening torques for lubricated housingscrews:
size tightening torque (Nm)DN 8 2DN 10 6DN 15 6DN 20 9DN 25 9DN 32 12DN 40 12DN 50 12
Attention
Note
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Pressure Relief Valve DHV 718
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d (mm) 12 16 20 25 32 40 50 63DN (mm) 8 10 15 20 25 32 40 50DN (Zoll) 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2
pipe thread G (inch) - 3/8 1/2 3/4 1 1 1/4 1 1/2 2thread NPT (inch) - 3/8 1/2 3/4 1 1 1/4 1 1/2 2PVDF/PVC-U/PP D 50,0 81,0 81,0 107,0 107,0 147,0 147,0 147,0
H 120,0 177,0 177,0 207,0 207,0 277,0 277,0 277,0PVDF/PVC-U/PP h 20,0 25,0 25,0 37,0 37,0 57,0 57,0 57,0PVC-U L1 119,0 144±1,0 144±1,0 174±1,0 174±1,0 224±1,1 224±1,1 244±1,2PP L1 119,0 144±2,1 144±2,1 174±2,6 174±2,6 224±3,3 224±3,3 244±3,6PVDF L1 119,0PVC-U/PP/PVDF L2 85,0 - - - - - - -PVC-U/PP/PVDF L3 91,0 - - - - - - -PVC-U/PP L4 - 94±1,0 94±1,0 130±1,0 130±1,0 162±1,0 176±1,0 188±1,0PVC-U/PP l - 14,0 16,0 19,0 22,0 26,0 31,0 38,0PVC-U/PP l1 - 16,0 18,0 20,0 22,0 24,0 26,0 30,0
M M 5 M 6 M 6 M 6 M 6 M 8 M 8 M 8v 32,0 40,0 40,0 46,0 46,0 65,0 65,0 65,0
View A View A View A
Housing: PVC-U, PP, PVDF
Weight (kg)
d (mm) 12 16 20 25 32 40 50 63
PVC-U socket/spigot 0,3 0,6 0,6 1,3 1,3 3,4 3,4 3,4PP socket/spigot 0,2 0,5 0,5 1,1 1,1 2,9 2,9 2,9PVDF socket 0,3 - - - - - - -PVC-U threaded socket - 0,6 0,6 1,3 1,3 3,3 3,3 3,3PP threaded socket - 0,5 0,5 1,1 1,1 2,9 2,9 2,9
Dimension
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Pressure Relief Valve DHV 718
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Housing: SS 1.4571
Dimension
d (mm) - 16 20 25 32 40 50 63DN (mm) - 10 15 20 25 32 40 50DN (inch) - 3/8 1/2 3/4 1 1 1/4 1 1/2 2
pipe thread G (inch) - 3/8 1/2 3/4 1 1 1/4 1 1/2 2thread NPT (inch) - 3/8 1/2 3/4 1 1 1/4 1 1/2 2threaded socket D - 81,5 81,5 108,0 108,0 148,0 148,0 148,0threaded socket H - 152,0 152,0 175,0 175,0 217,0 219,5 227,5
h - 16,0 16,0 24,0 24,0 27,5 30,0 35,0L4 - 79,0 79,0 103,0 103,0 142,0 140,0 136,0
NPT-thread l2 - 11,0 15,0 16,0 18,0 20,0 22,0 25,0pipe thread G l2 - 16,0 18,0 20,0 22,0 25,0 25,0 25,0
M - M 6 M 6 M 6 M 6 M 8 M 8 M 8v - 40 40 46 46 65 65 65
Weight (kg)
d (mm) - 16 20 25 32 40 50 63
Inox female thread - 1,7 1,7 4,4 4,4 9,4 9,9 11,1
View A
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Pressure Relief Valve DHV 718
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flow (l/h) for H2O 20 °C
work
ing p
ress
ure
(bar)
flow (l/h) for H2O 20 °C
work
ing p
ress
ure
(bar)
flow (l/h) for H2O 20 °C
work
ing p
ress
ure
(bar)
DN 15
DN 20
DN 25
Characteristic curves DHV 718 for H2O, 20°C
flow (l/h) for H2O 20 °C
work
ing p
ress
ure
(bar)
DN 10
The valve curves show the working or primarypressure pA (bar) in relation to flow Q (l/h).The parameter is the set pressure pE, the valve isclosed (Q = 0 l/h).The curve shows the progression of the openingpressure.
Example: Size DN 10The valve is set tight at 5 bar.At a pressure increase of 1 bar a flow ofappr. 940 l/h is reached.According to the curve following values arise:Set pressure pE appr. 5,0 barWorking pressure pA appr. 6,0 barOpening pressure pÖ appr. 5,4 barClosing pressure pS appr. 4,5 barHysteresis (pÖ-pS) appr. 1,0 bar
flow (l/h) for H2O 20 °C
work
ing p
ress
ure
(bar)
DN 8
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Pressure Relief Valve DHV 718
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flow (l/h) for H2O 20 °C
work
ing p
ress
ure
(bar)
DN 32
flow (l/h) for H2O 20 °C
work
ing p
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(bar)
DN 40
flow (l/h) for H2O 20 °C
work
ing p
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(bar)
DN 50
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Pressure Relief Valve DHV 718
Pos. Piece Description1 1 valve housing2 1 bonnet3 - -4 1 pressure plate5 1 spring plate6.1 1 spring6.2 1 spring7 1 steel ball8 - -9 1 flat diaphragm*10 4 socket head cap screw11 - -12 1 hexagonal nut13 4 hexagonal nut14 4 U-washer15 - -16 1 hexagonal srew17 - -18 2 O-ring19 2 union nut insert20 2 union nut
Pos. Piece Description1 1 valve housing2 1 bonnet3 1 diaphragm plate4 1 pressure plate5 1 spring plate6 1 spring7 1 steel ball8 1 steel ball9 1 flat diaphragm*10 2 hexagonal screw11 4 hexagonal screw12 1 hexagonal nut13 6 hexagonal nut14 6 U-washer15 6 U-washer16 1 hexagonal screw17 1 protection cap18 - -19 - -20 - -
Exploded view
* spare part* spare part
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Pressure Relief Valve DHV 718
330451 2007/06/26
1. Constant system pressure 2. Consumer 1 and/or 2 opens,pressure relief valve closes
Applications of pressure relief valves
<<<< <
∧∧∧∧∧1
∧∧ ∧∧∧
pÖ
pA
<<<< <
∧∧∧∧∧1
∧∧ ∧∧∧
pA ∧∧∧∧∧ pA
2
pÖ
3. Pressure relief valve as overflow valvePressure of container or plant system may notexceed the max. pressure value.
<<<< <
1 pA
pÖ
pP
pP ≥ pA
pP ≥ pÖ ⇒ valve openspP ≤ pÖ ⇒ valve closed
pP ≥ pÖ ⇒ valve openspP ≤ pÖ ⇒ valve closed
pÖ ≤ pA
pP ≥ pÖ ⇒ valve openspP ≤ pÖ ⇒ valve closed
pPpP
∧∧ ∧∧∧
pA = working pressurepP = pump pressurepÖ = opening pressure
Failure Cause RepairValve leaking at diaphragm. Diaphragm clamping pressure Fasten housing screws.
too low.
Pressure drops below set pressure. Diaphragm in the range of Replace diaphragm, if necessary, rectify sealseal seat defective. seat.High degree of pollution. Clean valve body.
Pressure rises above set value. Secondary area is blocked. Clean valve.
Valve is leaking at adjustment Diaphragm defective. Replace diaphragm.screw.
Failures, possible causes and repair
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330451 2007/06/26
Pressure Relief Valve DHV 718
330451 - 2006/10/25
connection spigot socket socket G thread NPT threadsealing - EPDM FPM - -
d DN DN Id.-No. Id.-No. Id.-No. Id.-No. Id.-No.(mm) (mm) (inch)12 8 1/4 - 127839 127840 - -16 10 3/8 135269 - - 135262 13633120 15 1/2 135270 - - 135263 13633225 20 3/4 135271 - - 135264 13633332 25 1 135272 - - 135265 13633440 32 1 1/4 135273 - - 135266 13633550 40 1 1/2 135274 - - 135267 13633663 50 2 135275 - - 135268 136337
Housing: PVC-U
Housung: PVDF
connection socket socketsealing EPDM FPM
d DN DN Id.-No. Id.-No.(mm) (mm) (inch)12 8 1/4 127843 127844
Housing: Inox
connection G thread NPT threadsealing - -
d DN DN Id.-No. Id.-No.(mm) (mm) (inch)16 10 3/8 137134 13628620 15 1/2 137135 13628725 20 3/4 137136 13628832 25 1 137137 13628940 32 1/4 137138 13629050 40 1 1/2 137139 13629163 50 2 137140 136292
Diaphragm: EPDM/PTFE
Housing: PP
connection spigot socket socket G thread NPT threadsealing - EPDM FPM - -
d DN DN Id.-No. Id.-No. Id.-No. Id.-No. Id.-No.(mm) (mm) (inch)12 8 1/4 - 127841 127842 - -16 10 3/8 135283 - - 135276 13633820 15 1/2 135284 - - 135277 13633925 20 3/4 135285 - - 135278 13634032 25 1 135286 - - 135279 13634140 32 1 1/4 135287 - - 135280 13634250 40 1 1/2 135288 - - 135281 13634363 50 2 135289 - - 135282 136344
Diaphragm: EPDM/PTFE
Diaphragm: EPDM/PTFE
Diaphragm: EPDM/PTFE
Technical alterations expected
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330451 2007/06/26
