Pressure relief valve DHV 716 set 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 remains unaffected • 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 keeping preset working pressures constant on the primary side. • The pressure relief valve can also be used as an overflow valve to prevent pressure peaks. In this case, the pressure relief valve is 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, when it is available. When the working or inlet pressure (primary side) rises above the set value, the diaphragm is lifted against the spring force. The valve opens and a pressure relief on the secondary side takes place. • The ribbed diaphragm, dimensioned for full valve lift, separates the medium in the valve body from the bonnet and the atmosphere. The hermetic seal - especially in the higher temperature 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 (ASV diaphragm pressure gauge guard, type MDM 902) in the pipe system after removing the protection cap. The adjustment screw is secured by a counter nut and can be sealed against unauthorized adjustment, if necessary. Flow Media • Technically pure, neutral and aggressive fluids, provided that the selected valve materials coming into contact with the media are resistant at the operating temperature according to the ASV-resistance guide. • For nitric acid or sulfuric acid please specify the precise operating conditions of the application. Fluid Temperature • see pressure-/temperature diagram Operating Pressure • see pressure-/temperature diagram Set Range • 0.5 - 10.0 bar Nominal Pressure (H 2 O, 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 www.hydramet.com.au www.hydramet.com.au WA SA & NT VIC & TAS NSW & ACT QLD (08) 9412 6100 (08) 8374 7800 (03) 9325 3900 (02) 4350 8200 (07) 3802 9500 [email protected][email protected][email protected][email protected][email protected]07/2012
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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,
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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
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
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
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..
Applications for Pressure Relief ValveExample 4: Pressure relief valve as overflow valve:The containerpressure or system must not exceed the max. pressure value
X = valve opensY = valve closedpA = working pressurepP = pump pressurepÖ = opening pressure
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).
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