Overflow valvesIndex

Pressure reducing valves and safety valves FD-001 page 567

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A Index and product compare

General informationpage

General information 568

Product informationBSP thread pageA Brass, Bronze and Stainless steel 569

Free outlet; Soft seal; Central heating application 570Angle type; Soft seal 571Differential pressure relief; Disc type; Central heatingapplication

572

Plunger type; Especially suitable for oil 573

DIN flanges pageBronze

Globe type 574Ductile cast iron

Regulating plug type; Bellows seal 575

Overflow valvesGeneral information

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Overflow valves are among the features that must prevent the accumulation of higher pressures in installations than they weredesigned for. Characteristic for an overflow valve in comparison to a safety valve is the fact that an overflow valve regularlyoverflows, whereas a safety valve actually should never blow off.

As an example, the situation with certain pumps can be used where the outlet pressure of the pump should not increase toomuch when the demand falls off. An overflow valve in the bypass pipe of the relevant pump could then discharge thepressure increase to the inlet or suction side of the pump. Contrary to a safety valve, where the excess pressure is alwaysdischarged from the system, the overflow valve generally keeps all media within the system.

Terms such as overflow, upstream pressure regulator, expansion valve and safety valve are confused. Please review theguideline below to be sure of e correct selection:

Term Function Features SelectionOverflow Prevention of pressure increase Opens regularly as a result of

a decreased demandin the system

Overflow valve, reliefvalvesand safety relief valves

Upstream pressureregulator

Maintains pressure on the inlet side Keeps pressure on the inlet sideconstant, functions as a pressure reducing valvein inverted form

Upstream pressure regulator (on request)

Expansion valve Prevention of pressure increase Sometimes opens due to expansion ofthe medium as a result of temperaturechanges, here it concerns smallquantities

reliefvalves andsafety relief valves

Safety Safeguards against prohibited pressure increase Only opens if all othersafeguards have failed toprevent a hazardous situation

Relief, safety reliefand full lift safety valves

It is apparent from the table that safety valves with a low-lifting opening characteristic can be used as an overflow orexpansion valve as well. Should a high degree of pressure fluctuations be expected with the application of a safety valve, it isrecommended to contact one of our product specialists. In such situations, the determination of the type and size is ofimportance for the correct functioning of the valve.

General and technical information regarding safety valves are specified in the section Safety valves.

Important data when determining type of bore• Medium• Phase (gas, vapour or liquid)• Temperature (°C)• Density (kg/m3)• Viscosity (cSt)• Quantity (kg/hour or m3/hour)• Set pressure (bar)• Back pressure, if applicable (bar)

Overflow valvesBSP threadBrass, Bronze and Stainless steel

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Ind

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epage 570 page 571 page 572

Free outletSoft sealCentral heatingapplication

Angle typeSoft seal

Differential pressurereliefDisc typeCentral heatingapplication

• B" - A"• 0.4 - 65 bar• Brass• Compact design• EPDM ball to 3.3 bar• Viton o-ring from 3.3 bar

• B" - A"• 0.4 - 65 bar• Brass or stainless steel• Compact design• EPDM ball to 3.3 bar• Viton o-ring from 3.3 bar

• C" - 1B"• Range 50 - 500 mbar• Max. 10 bar• Locking possibilities• Bronze• EPDM disc sealing

page 573

Plunger typeEspecially suitable foroil• A" - 2"• Max. 10 bar• Plunger shaped valve• Closed bonnet• Bronze

Overflow valvesBSP threadBrass, Bronze and Stainless steel

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Free outletSoft sealCentral heatingapplication• fig. 510C• fig. 510D

• B" - A"• 0.4 - 65 bar• Brass• Compact design• EPDM ball to 3.3 bar• Viton o-ring from 3.3 bar

ApplicationsCompact overflow valve with free outlet. Suitable for small compressed air systems.

DesignFor set pressure up to 3.3 bar this overflow valve has a disc with EDPM ball, for higherset pressures the disc has a Viton o-ring.

Prcoess data• Set pressure min. 04, bar max. 65 bar (with standard design)• Temperature -10 °C tot 130 °C

ConnectionInlet BSP maleOutlet free

Material specificationComponent Material

Body and bonnet BrassSpring Stainless steelValve sealing ring to 3.3 bar EPDMValve sealing ring from 3.3 bar FPM (Viton)

Special variants• Setpressure up to 120 bar for ˘" and A" design

CapacityCapacity chart on request

Ordering informationOrdering code Material Type Spring range DN

[bar] ["]510C Brass Free outlet, without lifting lever 1) B - A510D Brass Free outlet, with lifting lever 1) B - A1) Spring range [bar]

• 0.4 - 0.5 • 0.6 - 1.6 • 1.7 - 3.2 • 3.3 - 7 • 7.1 - 15 • 15.1 - 20 • 21 - 35 • 36 - 54 • 55 - 65Attention: should the overflow valve need a set pressure, specify this when ordering.

DimensionsFig. DN do A A1 B E SW Weight

["] [mm] [kg]510C B 6 64 12 18 22 0.12510C ˘ 8 64 12 22 22 0.14510C A 8 64 14 24 24 0.16510D B 6 72 12 18 22 0.12510D ˘ 8 72 12 22 22 0.14510D A 8 72 14 24 24 0.16

A

B

do

C

E

SW

Overflow valvesBSP threadBrass, Bronze and Stainless steel

Pressure reducing valves and safety valves FD-01-003 page 571

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Angle typeSoft seal• fig. 511C• fig. 511D• fig. 511RVS

• B" - A"• 0.4 - 65 bar• Brass or stainless steel• Compact design• EPDM ball to 3.3 bar• Viton o-ring from 3.3 bar

ApplicationsSimple, compact overflow valve for low capacities. Suitable for gasses and fluids.

DesignFor set pressure up to 3.3 bar this overflow valve has a disc with EDPM ball, for higherset pressures the disc has a Viton o-ring.

Prcoess data• Set pressure max. 65 bar (with standard design)• Temperatuur -10 °C tot 130 °C

Connection• Inlet BSP male• Outlet BSP female

Material specificationComponent Material

Fig. 511C/DBody and bonnet BrassSpring Stainless steelValve sealing ring to 3.3 bar EPDMValve sealing ring from 3.3 bar FPM (Viton)

Fig. 511RVSBody and bonnet Stainless steelSpring Stainless steelValve sealing ring to 3.3 bar EPDMValve sealing ring from 3.3 bar FPM (Viton)

Special variants• Fig. 511C/D, ˘" connection with setpressure up to 120 bar• Fig. 511RVS, B" en ˘" connection with setpressure up to 200 bar• Fig. 511RVS with NPT connection on inlet

CapacityCapacity chart on request

Ordering informationOrdering code Material Type Spring range DN

[bar] ["]511C Brass Without disc lever 1) B - ˘511D Brass With disc lever 1) B - ˘511RVS Stainless steel Without disc lever 1) B - ˘1) Spring range [bar]

• 0.4 - 0.5 • 0.6 - 1.6 • 1.7 - 3.2 • 3.3 - 7 • 7.1 - 15 • 15.1 - 20 • 21 - 35 • 36 - 54 • 55 - 65Attention: should the overflow valve need a set pressure, specify this when ordering.

DimensionsFig. DN DN 1 do A A1 B E F G I SW Weight

["] [mm] [kg]511C B ˘ 6 55 12 18 26 9.5 11.5 22 0.15511C ˘ ˘ 6 55 12 22 26 9.5 11.5 22 0.15511D B ˘ 6 72 12 18 26 9.5 11.5 22 0.15511D ˘ ˘ 6 72 12 22 26 9.5 11.5 22 0.15511SS B ˘ 6 55 12 18 26 9.5 11.5 22 0.15511SS ˘ ˘ 6 55 12 22 26 9.5 11.5 22 0.15

A

B

do

C

E

F

G

HI

SW

Overflow valvesBSP threadBrass, Bronze and Stainless steel

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Differential pressurereliefDisc typeCentral heatingapplication• fig. 3494• fig. 3495

• C" - 1B"• Range 50 - 500 mbar• Max. 10 bar• Locking possibilities• Bronze• EPDM disc sealing

In hot water central heating installations (mainly during spring and autumn when theheat demand is low), irritating flow noise could occur as a result of the increased pumppressure, which arises due to the closing of the radiator valves.Due to the installation of a differential overflow valve, these irritating noises can besignificantly reduced.In installations with a gas fired boiler, the minimum circulation flow is maintained, evenif the radiator valves are closed.

OperationThe bypass will open if the differential pressure is higher than the set value for theoverflow valve.

Features• Variable setting from 50 to 500 mbar• Default setting 200 mbar• Factory locking possibilities at each set position• Indication of the actual set differential pressure (fig. 3495 only)

Maximum operating pressure and temperature• 10 bar - 120 °C

Material specificationComponent Material

Fig. 3494Body BronzeBonnet BrassValve disc and sealing ring EPDMSpring Stainless steel

Fig. 3495Body BronzeBonnet PlasticValve disc and sealing ring EPDMSpring Stainless steel

Installation example

Installation of a bypass pipe between supply and return pipe.

Ordering informationOrdering code Material Type Adjustment range DN

[mbar] ["]3494 Bronze Standard 50 - 500 C - 1B3495 Bronze With indicator 50 - 500 C - 1BAttention: should the overflow valve need a set pressure, specify this when ordering.

DimensionsDN L1 L2 H["] [mm]C 40 34.5 119.5

1 48.5 40 128.51B 46.5 46 135.5 L1

DN

H

L2

Overflow valvesBSP threadBrass, Bronze and Stainless steel

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Plunger typeEspecially suitable foroil• fig. 1520

• A" - 2"• Max. 10 bar• Plunger shaped valve• Closed bonnet• Bronze

ApplicationEcon® overflow valve fig. 1520 is especially developed for use in closed systems, suchas oil burners. This type of overflow valve never fully closes.

RemarkApart from these specific overflow valve, in some situations safety valves can be usedas well. For further information, refer to the introductory pages of this section.

Standard variants• Materials Bronze• Connections A" - 2" BSP female thread• Pressure rating Max. 10 bar• Temperature Max. 200 °C

Material specificationComponent Material EN and/or (DIN) W.nr.Body Bronze CuSn5Zn5Pb5-C (G-CuSn5ZnPb (Rg 5)) 2.1096.01Cover Brass CuZn39Pb3 2.0401Plunger Stainless steel X14CrMoS17 (X12CrMoS17) 1.4104Spring Stainless steel

Ordering informationOrdering code Material Spring range Colour code, spring DN

[bar] ["]1520 Bronze 0.5 – 1 Green A - 21520 Bronze 1 – 6 Yellow A - 21520 Bronze 6 – 10 Red A - 2Attention: should an overflow valve need to be preset by Econosto, the set pressure should be specified whenordering.

DimensionsDN D L H Weight["] [mm] [kg]A 10 40 115 0.8C 15 46 120 1

1 20 53 130 1.71B 25 55 165 31A 32 60 170 52 40 80 225 8.2

H

DNInlet

DNOutlet

D

L

L

Overflow valvesDIN flangesBronze

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Globe type• fig. 523• fig. 524

• DN 15 - 125• Maritime applications etc.• Flat faced flanges• Closed bonnet• Angle pattern• Straight pattern• Bronze

ApplicationEcon® bronze overflow valves fig. 523 and 524 are primarily applied in the maritimesegment for pressure regulation in liquid systems. Suitable for salt and fresh water, oil,steam and air.

RemarkThis valve may also be used as a safety valve aboard ships. In connection with the PEDguidelines, this is not permitted for installations on land, if the set pressure is >0,5 bar.

Temperature range120 °C

Material specificationComponent Material EN and/or (DIN) W.nr.

Body Bronze CuSn5Zn5Pb5-C (G-CuSn5ZnPb (Rg 5)) 2.1096.01Disc, stem, guide bush Brass CuZn39Pb3 2.0401Spring Spring steelGasket GraphiteBonnet DN 15-20 Brass CuZn39Pb3 2.0401Bonnet DN 25-125 Bronze CuSn5Zn5Pb5-C (G-CuSn5ZnPb (Rg 5)) 2.1096.01

Other variants• Other type of bronze (for parts in contact with the medium)• Higher pressures for DN 65 thru DN 125• Disc with soft seal• Lifting lever

Ordering informationOrdering code Model Max pressure setting DN

[bar] [mm]523 Straight See dimensions tabel 15 – 125524 Angle See dimensions tabel 15 – 125Attention: indicate the set pressure when ordering.

Capacities for water in kg/hour at 20 °CP DN

[bar] [mm]15 20 25 32 40 50 65 80 100 125

0.5 341 607 948 1553 2427 3792 6408 9706 15166 236971 483 858 1341 2196 3432 5362 9062 13727 21448 335131.5 591 1051 1642 2690 4203 6567 11098 16812 26268 410442 682 1213 1896 3106 4853 7583 12815 19412 30332 473943 836 1486 2322 3804 5944 9287 15695 23775 37148 580444 965 1716 2681 4393 6863 10724 18124 27453 42896 670255 1079 1918 2997 4911 7673 11990 20262 30693 479586 1182 2101 3284 5380 8406 13134 22196 33623 525367 1277 2270 3547 5811 9079 14187 23975 363178 1365 2427 3792 6212 9706 15166 25631 388259 1448 2574 4021 6589 10295 16086 27184

10 1526 2713 4239 6945 10852 16956 2865611 1601 2845 4446 7284 11381 1778412 1672 2972 4644 7608 11887 1857413 1740 3093 4833 7919 12373 1933314 1806 3210 5016 8218 12840 2006315 1869 3323 5192 8506 13291 2076716 1930 3432 5362

DimensionsDN Max pressure setting A L L1 H H1 Weight

[mm] [bar] [mm] [kg]15 0 – 16 bar 95 120 65 185 175 420 0 – 16 bar 105 120 65 185 175 4.125 0 – 16 bar 115 140 70 200 185 5.532 0 – 15 bar 140 150 90 200 185 7.840 0 – 15 bar 150 155 90 235 220 9.850 0 – 15 bar 165 180 105 245 225 1465 0 – 10 bar 185 200 115 330 320 1880 0 – 8 bar 200 240 125 345 335 23.2

100 0 – 6 bar 220 270 145 435 395 35.5125 0 – 4 bar 250 32 174 450 490 50

L1

ADN

L1

H1

L

DN A

H

Fig. 523

Fig. 524

Overflow valvesDIN flangesDuctile cast iron

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Regulating plug typeBellows seal• fig. 1911

• DN 25 - 100• Spring loaded• Closed bonnet• Straight pattern

ApplicationDuctile cast iron overflow valves are primarily applied parallel to a pump to secure aminimum flow.Suitable for water and oil.

Temperature range-10/120 °C 150 °C 200 °C 250 °C 300 °C 350 °C

PN 16 16 15.5 14.7 13.9 12.8 11.2 [bar]

Pressure range0.5 - 1.5 bar; 1 - 3 bar; 2 - 5 bar; 4 - 10 bar

Selection of pressure rangeThe differential pressure gives the pressure range. Please observe the max.permissible back pressure. If two pressure ranges are possible, you should choose thelower range.

Material specificationComponent Material EN and/or (DIN) W.nr.

Body and bonnet Ductile cast iron GJS-400-18-LT (GGG-40.3) 0.7043Bellows and stem Stainless steel X6CrNiMoTi17-12-2 1.4571Plug Stainless steel X20Cr13 1.4021Spring Spring steelGasket Graphite

Special variants• Body material cast iron, steel or stainless steel

SizingFor sizing please contact Econosto.

Ordering informationOrdering code Model Pressure range DN

[bar] [mm]1911 Straight 1) 25 – 1001) Pressure range [bar]

• 0.5-1.5 bar • 1-3 bar • 2-5 bar • 4-10 barAttention: indicate the set pressure when ordering.

Max. permissible back pressureDN [mm]

25 32 40 50 65 80 100Pressure range[bar]

differential pressure[bar]

Max. permissible back pressure[bar]

0.5- 1.5 0.5 6.9 6.4 6.6 9.5 4.9 6.7 5.90.5- 1.5 1 5.4 4.4 4.7 6.5 3.3 4.9 4.20.5- 1.5 1.5 3.9 2.4 2.7 3.5 1.7 3.1 2.51 - 3 1 10.9 11.2 9.9 14 7 7.7 6.81 - 3 2 7.6 7.2 6 10.4 3.8 4.2 3.51 - 3 3 4.6 3.2 2 6.8 0.5 0.6 0.12 - 5 2 12 12 12 12 11.3 10.8 10.22 - 5 3 9.3 9.2 8.4 9.8 8.1 7.2 6.82 - 5 4 6.6 6.5 4.9 7.7 4.8 3.7 3.52 - 5 5 3.9 3.7 1.3 5.5 1.6 0.1 0.14 -10 4 8 8 8 8 8 8 84 -10 6 5.7 5.7 5.7 5.7 5.7 5.7 5.74 -10 8 3.3 3.3 3.3 3.3 3.3 3.3 3.34 -10 10 1 1 1 1 1 1 1

DimensionsDN L H Weight Kvs-value

[mm] [kg] [m3/hour]25 160 290 6.6 332 180 300 7.7 540 200 325 10.4 1050 230 330 12.9 2065 290 400 20.2 2280 310 440 28.9 29

100 350 500 43.7 45

H

L

DN