Download pdf - Pressure relief valve DHV 716 - Hydramet 716 Stubbe Pressure Relief... · Pressure relief valve DHV 716 set range: 0,5 - 10,0 bar Advantage • pressure setting possible at any time,

Pressure relief valve DHV 716set range: 0,5 - 10,0 bar

Advantage• pressure setting possible at any time, also during operation• optimum monitoring valves• high reproducibility of the set pressure• high level of operating safety and long service life• constant, low vibration control• low-maintenance• can be easily connected to the pipework by proven technologies

- solvent or fusion welding• metal inserts in the valve body allow the valves to be directly

fitted to mounting sets, the movability of the union nuts remainsunaffected

• reliable diaphragm fastening with standard stainless steel screws• hermetically sealed by valve diaphragm with formed sealing

rings• short face-to-face dimension of the threaded variant

Application• chemical plants• industrial plants• water treatment

Intended Use• The pressure relief valve which is directly controlled by the

medium, is used in technical processing plants for keepingpreset working pressures constant on the primary side.

• The pressure relief valve can also be used as an overflow valveto prevent pressure peaks. In this case, the pressure relief valveis fitted in a bypass line.

Valve Function• When the valve is closed in the position of rest, the piston and/or

valve seat is only impinged with the secondary pressure, whenit is available. When the working or inlet pressure (primary side)rises above the set value, the diaphragm is lifted against thespring force. The valve opens and a pressure relief on thesecondary side takes place.

• The ribbed diaphragm, dimensioned for full valve lift, separatesthe medium in the valve body from the bonnet and theatmosphere. The hermetic seal - especially in the highertemperature range - is ensured by formed sealing rings.

Valve Setting• Set or adjust the desired or permissible working pressure at the

adjustment screw with the aid of pressure gauges (ASVdiaphragm pressure gauge guard, type MDM 902) in the pipesystem after removing the protection cap. The adjustment screwis secured by a counter nut and can be sealed againstunauthorized adjustment, if necessary.

Flow Media• Technically pure, neutral and aggressive fluids, provided that

the selected valve materials coming into contact with the mediaare resistant at the operating temperature according to theASV-resistance guide.

• For nitric acid or sulfuric acid please specify the precise operatingconditions of the application.

Fluid Temperature• see pressure-/temperature diagram

Operating Pressure• see pressure-/temperature diagram

Set Range• 0.5 - 10.0 bar

Nominal Pressure (H2O, 20°C)• PN 10

Working Pressure• set pressure plus flow dependent pressure increase (see

characteristic curves).

Opening Pressure Difference• ca. 0.4 bar

Hysteresis• Difference between opening and closing pressure approx. 0.3

bar

Valve Body• PVC-U• PP• PVDF

Bonnet• PP, glass fibre reinforced

Diaphragm• PTFE (EPDM diaphragm with PTFE coating on the surfaces coming

into contact with the medium)

Sealing• FPM• EPDM

Screws• stainless steel (1.4301)

Actuation• medium controlled

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Connection• union DIN 8063• union socket end for solvent welding DIN ISO (PVC-U)• union socket end for fusion welding DIN ISO (PP)• union socket end for fusion welding DIN ISO (PVDF)• spigot end for solvent welding DIN ISO (PVC-U)• fusion spigot end DIN ISO (PP)• fusion spigot end DIN ISO (PVDF)• union socket end for fusion welding DIN ISO (PP) on request• union socket end for fusion welding DIN ISO (PE) on request

Flow Direction• always in the direction of the arrow

Mounting Position• as required

Fastening• via threaded inserts (metal inserts) in the valve body

Colour• body: PVC-U, grey, RAL 7011• body: PP, grey, RAL 7032• body: PVDF, opaque, yellowish-white• bonnet: orange, RAL 2004• bottom section: PVC-U, grey, RAL 7011• bottom section: PP, grey, RAL 7032• bottom section: PVDF, opaque, yellowish-white

Pressure Gauge Connection• The pressure relief valve can be factory fitted with a pressure

gauge for neutral media. The resistance of the pressure gaugematerial has to be taken into consideration for other media.

• The pressure gauge is normally connected to the primary side.



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Pressure/temperature diagram

P = operating pressureT = temperatureThe pressure/temperature limits are applicable for the statednominal pressures and a computed operating life factor of 25 years.These are standard values for harmless media (DIN 2403), to whichthe valve material is resistant.For other media please refer to the ASV resistance guide.The durability of wear parts depends on the operating conditionsof the application.For temperatures below 0°C (PP < +10°C) please specify the preciseoperating conditions of the application.The rated pressure depends on the valve size and material. Forthe corresponding rated pressure value of the valve, please referto the »Order table«.

Pressure loss curve (standard values for H2O, 20°C)

∆P = pressure lossQ = flowpressure loss and kv valueThe diagram shows the pressure loss ∆P in relation to the flow Q.Conversion aid:cv = kv x 0.07; fv = kv x 0.0585Units:kv [l/min]; cv [gal/min] US; fv [gal/min] GBOperating behaviour

pE = set PressurepA = working pressurepÖ = opening pressurepS = closing pressurepÖ - pS = hystersispE - pA = flow dependent pressure reductionQ = flow

Pressure relief valves, Pressure relief valve DHV 716



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Sectional drawing DHV 716

A = primary sideB = secondary side1 = protection cap2 = adjustment screw3 = counter nut4 = piston5= diaphragm6 = flat sealing ring7 = valve seat

DHV 716 with pressure gauge

The pressure relief valve can be factory fitted with a pressure gaugefor neutral media. The resistance of the pressure gauge materialhas to be taken into consideration for other media..




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Applications for Pressure Relief ValveExample 1: Constant system pressure

X = valve opensY = valve closedpA = working pressurepP = pump pressurepÖ = opening pressure

Applications for Pressure Relief ValveExample 2: Consumer 1 and/or 2 opens, pressure relief valve closes


Applications for Pressure Relief ValveExample 3: Pressure relief valve as backflow preventer

X = valve opensY = valve closedpmax = max. pressurepP = pump pressurepÖ = opening pressure

Applications for Pressure Relief ValveExample 4: Pressure relief valve as overflow valve:The containerpressure or system must not exceed the max. pressure value





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Malfunctions, possible causes, rectification

Maintenance noteScrew tightening torque (Nm)

The specified values apply to lubricated screws.Check the tightening torque of the body screws at certain intervalsin case of setting of the diaphragms and/or temperaturefluctuations.

Operating noteSafe operation of the valve can only be ensured if it is properlyinstalled, operated, serviced or repaired by qualified personnelaccording to its intended use while observing the accidentprevention regulations, safety regulations, relevant standards,directives/technical regulations or codes of practice such as e.g.DIN, DIN EN, DIN ISO and DVS*. *DVS = German Welding SocietyThe intended use includes adhering to specified limit values forpressure and temperature, as well as checking the resistance. Thisrequires all components coming into contact with the medium tobe "resistant" in accordance with the ASV resistance guide.Pressure gauge versionIf the valve body is equipped with a pressure gauge, do not tightenthe pressure gauge with more than max. 3 Nm.Please take into account that the material PTFE is classified asresistant against many media, however, PTFE is not diffusion tightwhen used as a film, e.g. for the ASV membranes. Please contactus for limit cases (nitric acid or sulfuric acid).




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body PVC-U

63504032252016d(mm)sizepressure range 50403225201510DN(mm)

21 1/21 1/413/41/23/8DN(inch)10101010101010PN(bar)

0.5-100.5-100.5-100.5-100.5-100.5-100.5-10setting range (bar)

ident No.sealingConnection

119048119047119046119045119044119043119042EPDMPVC-Usocket end DIN ISO 119055

4.28 kg1190544.18 kg

1190534.10 kg

1190521.61 kg

1190511.57 kg

1190500.72 kg

1190490.67 kg

FPMweight

121970121969121968121967121966121965121964EPDMPVC-Uspigot end DIN ISO 121977

5.20 kg1219765.10 kg

1219755.00 kg

1219741.90 kg

1219731.86 kg

1219720.85 kg

1219710.80 kg

FPMweight

body PP


21 1/21 1/413/41/23/8DN(inch)10101010101010PN(bar)



119062119061119060119059119058119057119056EPDMPPsocket end DIN ISO 119069

5.65 kg1190685.55 kg

1190675.45 kg

1190662.15 kg

1190652.11 kg

1190641.07 kg

1190631.02 kg

FPMweight

121984121983121982121981121980121979121978EPDMPPspigot end DIN ISO 121991

4.28 kg1219904.18 kg

1219894.10 kg

1219881.61 kg

1219871.57 kg

1219860.72 kg

1219850.67 kg

FPMweight




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body PVDF


21 1/21 1/413/41/23/8DN(inch)10101010101010PN(bar)



1190835.65 kg

1190825.55 kg

1190815.45 kg

1190802.15 kg

1190792.11 kg

1190781.07 kg

1190771.02 kg

FPMweight

PVDFsocket end DIN ISO

122005122004122003122002122001122000121999FPMPVDFspigot end DIN ISO




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dimensions

63504032252016d(mm)50403225201510DN(mm)

21 1/21 1/413/41/23/8DN(inch)

dimensions(mm)

63504032252016d57575737372525hPP/PVC-U54545436362424hPVDF

244224224174174144144L1205205205150150120120L2PP/PVC-U200200200147147118118L2PVDF211211211156156126126L3PP/PVC-U207207207153153124124L3PVDF

38312622191614t262262262202202174174H1471471471071078181N65656546464040V




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Item Overview

designationquantitypositionvalve body11bonnet12separating disc13pressure disc14diaphragm15pressure plate16spring plate17pressure spring18steel ball19piston110piston point111disc112hexagon bolt113steel ball114hexagon bolt115hexagon nut116O-ring217protection cap118hexagon bolt419hexagon nut421disc422union end223union nut224protection cap425protection cap426disc427Plug229

designationquantitypositionvalve body11bonnet12separating disc13pressure disc14diaphragm15pressure plate16spring plate17pressure spring18steel ball19piston110piston point111disc112hexagon bolt113steel ball114hexagon bolt115hexagon nut116O-ring217protection cap118hexagon bolt419hexagon bolt220hexagon nut621disc622union end223union nut224protection cap625protection cap626disc627Plug229




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Characteristic curvesConfiguration example

The valve is set tight at 5 bar.A flow of approx. 2000 l/h is reached at a pressure increase of 1 bar.According to the curve, this results in the following values:set pressure pE: 5 bar; working pressure pA: 6 bar; opening pressure pÖ: 5.4 bar; closing pressure pS: 5.1 barDN 10

pA = working pressureQ = flow

DN 15


DN 20


DN 25





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DN 32


DN 40


DN 50





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