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Pressure reducing valvesIndex

Pressure reducing valves and safety valves FA-001 page 505

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A Index and product compare

General informationpage

Introduction 506General introduction 507Installation instructions for a steam plant 509

Product informationBSP thread pageA Brass 510

Direct-acting; BSP female thread 511Direct-acting; BSP male thread 513

Stainless steelDirect-acting; BSP female thread; High pressure 514

DIN flanges pageA Bronze 515

Direct-acting; Flanges PN 25 516Direct-acting; Flanges PN 40 517

Cast ironDirect-acting; Flanges PN 16 518

A Ductile cast iron 519Direct-acting; Flanges PN 25; Max. 70 °C 520Direct-acting; Flanges PN 25; Max. 350 °C 521

SteelDirect-acting; Flanges PN 40 522

Stainless steelDirect-acting; Flanges PN 16-100; High pressure 523

Pressure reducing valves


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ConnectionFlanges: DIN or ASMEBSP or NPT thread

Material of bodybrassbronzeductile cast ironsteelstainless steel

Springsteelstainless steel

Controlsimple diaphragmbronze or SS bellowsservo valve setdiaphragm chamber

Condensate vessel

Impulse line

Bellows

Disc

Seat

Spring plate

Spring plate

Bellows

Tail piece

Venting plug

Pressure reducing valvesGeneral introduction


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Self-operating pressure reducing valves are fittings that can sufficiently restrict the medium (steam, compressed air, water,etc.) so that the secondary pressure is reduced, without the use of auxiliary energy. Pressure reducing valves are often used toprotect the downstream section of the installation from excessive pressure. The following process data is important whenselecting a pressure reducing valve:

• medium• temperature• capacity (*)• upstream pressure• downstream pressure(*) gases are compressible, so it is important with the capacity to indicate what pressure is present.

BackgroundA differential pressure produces a flow of a medium and the velocity depends on this differential pressure (dP). A highervelocity arises through a higher differential pressure and a higher pressure loss is the results of a higher velocity.

The relationship between differential pressure (loss) and velocity can be expressed as dP = v². Because velocity is squared inthis equation, it is clear that a small increase in velocity has a significant influence on the pressure drop.

When a medium flows through a pipe, the flow rate (Q) depends on the velocity (v) and surface (A) of the pipe cross-section:Q(m ) = A(m ) x v(m/s)

Should the same quantity flow also through a smaller bore, this means that the velocity at that point will be higher. The flowrate in a pressure reducing valve is increased or decreased by making the valve opening smaller or larger.

Velocity for gases, including steam, cannot be increased indefinitely. There is an upper limit, at which the velocity will nolonger increase. This velocity is referred to as critical velocity and occurs at the so-called critical pressure drop(p2 = 0.58 x p1). A further drop of the downstream pressure p2 can only be achieved by enlarging the pipe following thepressure reducing valve. Common practice with gases is for the pipe diameter after the pressure reducing valve to be greaterthan the diameter before it.

The self-operating pressure reducing valves can be divided into two variants, being:1) direct-acting2) indirect-acting

1) Direct-acting variantThis is usually a simple pressure reducing valve in which spring pressure produces the required downstream pressure directly.

2) Indirect-acting variantThis is a pressure reducing valve in which the spring pressure first actuates a servo valve. The servo valve subsequentlyactuates the main valve, which ensures that the required downstream pressure is achieved.

StrainerIt is recommended to install a strainer before each pressure reducing valve. This strainer will safeguard the pressure reducingvalve against contamination carried along in the pipe, such as rust particles, welding debris and mill skin of the pipe. Thestrainer element already built into some pressure reducing valves then functions as extra protection.

Globe valveIt is recommended to fit a globe valve before and after the pressure reducing valve. If required a pressure reducing valve canthen easily be replaced and/or overhauled. In exceptional circumstances the use of a bypass valve can ensure uninterruptedduty.

Pressure gaugeTo be able to adjust pressure reducing valves and check for the proper functioning it is recommended to fit a pressure gaugebefore and after each pressure reducing valve. The actual prevailing pressure can be read out using pressure gauges.

SafetyBecause pressure reducing valves are subject to wear and tear, it is recommended to fit a safety valve after each pressurereducing valve. This safety valve will safeguard the following system from excessive pressure. In some situations (e.g. steaminstallation), the installation of a safety device is even compulsory, if the equipment following the reduction cannot or may notbe subjected to the initial pressure.

Pressure reducing valvesGeneral introduction


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Capacity chart

30

20

108

6

4

2

1.5

10.8

0,6

0.4

0.2

0.1

0.10.5

108642

1 1008642

10008642

CAPACITY in m3/hour

DN 250

DN 200

DN 150

DN 125DN 1

00

DN 65

DN 80

DN 8 (1

/4")

DN 50

(2")

DN 40

(1 1/

2")

DN 32

(1 1/

4")

DN 25

(1")

DN 20

(3/4"

)

DN 10

(3/8"

)

DN 15

(1/2"

)

FLO

W V

ELO

CIT

Y in

m/s

Water

Compressed air

Figure142

143

148

141B

141GYP

141NOD

147

1535

1536

Calculation example for airA pressure reducing valve is required for compressed air from 8 to 2 bar, with a capacity of 30 m3 standard volume (volume at0 °C and 101.325 kPa).The 30 m3 standard volume should first be converted to m3, at the downstream pressure (in bar abs).In this case: 30/(2 + 1) = 10 m3/hour.For compressed air, from 10 m3/hour on the horizontal axis, go up to the intersection with the compressed air line for DN A",at a velocity of 15.7 m/sec.

Calculation example for waterA pressure reducing valve for water with a capacity of 10 m3/hour is required.From 10 m3/hour on the horizontal axis go upwards and from 1.5 m/sec. on the vertical axis, locate an intersection. Thisresults in the choice for a pressure reducing valve with a DN 50 connection.

Application indexFigure

142 152 143 1535 141B 147 141GYP 141NOD 1908 1909 1536148

MediumWater B B B B B B B B

Liquids B B B B B B B B

Steam B B

Compressed air B B B B B B B B B B

Nitrogen B B B B B B B B

Other B B B B B B B B B

Pressure reducing valvesInstallation instructions for a steam plant


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A steam installation:Below you will find a possible set-up of a pressure reducing valve in a steam installation. For the design of the so-calledpressure reducing installation the, following aspects are to be considered:

• A steam pipe should be installed on a fall of 3 - 5 mm per metre. Econosto recommends a dripleg every 25 - 30 meters, bymeans of a trap set.

• Econosto recommends branching the main steam pipe from the top of the pipe.• For pressure reducing valves and control valves Econosto recommends installing a water separator and a strainer. This

extra protection will extend the service life of a pressure reducing valve or control valve.• According to Stoomwezen/Lloyd's Register a spring-loaded safety valve should be fitted behind each pressure reducing

valve (in a steam installation). The method of determining the size of the spring-loaded safety valve is described in theNetherlands Steam Act.

• When ordering a spring-loaded safety valve, the set pressure is to be indicated. The set pressure should always be higherthan the normal operating pressure. Also refer to section safety valves.

• Econosto recommends using the Spiratec system to monitor steam traps in a steam installation.

G

A

BC

D E

I

F

J H

FILTER

SPIRATEC

STEAM TRAP

A Water separatorB Valve (fig. 430 or fig. 436)C Filter (fig. 1019 or fig. 1124)D Pressure gauge set (fig. 334 pressure gauge)

(fig. 1350 siphon)(fig. 862 pressure gauge valve)

E Pressure reducing valve (fig. 1908)F Valve (fig. 430 or fig. 436)G Bypass valve (fig. 430 or fig. 436)H Safety valve (fig. 567)I Valve in impulse line (fig. 251)J Pressure gauge set (fig. 334 pressure gauge)

(fig. 1350 siphon)(fig. 862 pressure gauge valve)

Remark• Besides these specified figure numbers, other figure numbers can be applied for other materials.

Pressure reducing valvesBSP threadBrass

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Direct-actingBSP female thread

Direct-actingBSP female thread

Direct-actingBSP male thread

• Compressed air and gases• B" - 2"• Max. 70 °C• Max. 40 bar• Range 1-10 bar• Max. pressure ratio 10: 1• B" pressure gauge connection

• Water• A" - C"• Max. 70 °C• Max. 16 bar• Range 1.5-6 bar• Max. pressure ratio 10: 1• B" pressure gauge connection• Brass dezincification resistant

• Water, compressed air andnitrogen

• A" - 2"• Max. 70 °C• Max. 25 bar• Range 0.5-6 bar• Max. pressure ratio 10: 1• B" pressure gauge connection• DVGW approval (fig. 143)• KIWA approval (fig. 143)



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Direct-actingBSP female thread• fig. 142

• Compressed air and gases• B" - 2"• Max. 70 °C• Max. 40 bar• Range 1-10 bar• Max. pressure ratio 10: 1• B" pressure gauge connection

Simple, efficient pressure reducing valve, in which the pressure spring does notcontact the medium.Purpose: compressed air and other non-hazardous gases.

Process data• Max. inlet pressure and temperature 40 bar - 70 °C• Minimum differential pressure 1 bar

Downstream pressure range• 1 - 10 bar

Connection• BSP female thread connection

Material specificationComponent Material

Body and cover BrassDisc guide BrassSpring cap PlasticDiaphragm NBRDisc sealing ring NBRO-ring NBR

Accessories• Pressure gauge with bottom connection (e.g. fig. 334, case diameter 63 mm)

Installation instructions• Install in a horizontal pipe, with spring cap underneath

Remark• The picture shows the execution for the sizes B" - C". The sizes 1" - 2" are without

knob.

CapacitySee capacity chart in the introduction of this section

Ordering informationOrdering code Reduced pressure range DN

[bar] ["]142 1 - 10 B - 2

DimensionsFig. DN L H h Weight Kvs-value

["] [mm] [kg] [m3/hour]142 B 50 90 34 0.3 0.9142 ˘ 50 90 34 0.3 1.0142 A 65 105 36 0.45 1.5142 C 80 105 42 0.6 2.5142 1 95 150 57 1.35 5.0142 1B 105 160 57 1.8 6.0142 1A 115 200 72 2.9 11.5142 2 130 210 72 3.8 12.5

L

H

h



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Direct-actingBSP female thread• fig. 152

• Water• A" - C"• Max. 70 °C• Max. 16 bar• Range 1.5-6 bar• Max. pressure ratio 10: 1• B" pressure gauge connection• Brass dezincification resistant

Compact pressure reducing valve designed for small installations (households). Due tothe design this pressure reducing valve is suitable for low capacities and the mediumdoes not contact the spring.Purpose: water.


Downstream pressure range• 1.5 - 6 bar



Body, disc and seat BrassSpring Stainless steelDiaphragm NBRO-ring NBR


Installation instructions• Install in a horizontal pipe, with spring cap above


[bar] ["]152 1.5 - 6 A - C

DimensionsFig. DN L H H1 Weight Kvs-value

["] [mm] [kg] [m3/hour]152 A 83 67.5 33.5 0.3 1.76152 C 90 67.5 33.5 0.4 1.76

H

H1

DN

L



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Direct-actingBSP male thread• fig. 143• fig. 148


• A" - 2"• Max. 70 °C• Max. 25 bar• Range 0.5-6 bar• Max. pressure ratio 10: 1• B" pressure gauge connection• DVGW approval (fig. 143)• KIWA approval (fig. 143)

Reliable pressure reducing valve, provided with strainer element (mesh size 0.16 mm).The valve is constructed as a single seat balanced disc. The synthetic trim makes thistype resistant to corrosion and cavitation. The construction gives especially low-noiseoperation. The spring cap is provided with a pressure indication.Purpose: water, other non-aggressive liquids, compressed air and nitrogen.


Downstream pressure range• 1.5 - 6 bar • 0.5 - 2 bar

Connection• Couplings with BSP male thread connection


Body and couplings BrassSpring cap, adjustment knob, disc and seat PlasticDiaphragm and gaskets NBRStrainer Stainless steel

Special variants• For higher downstream pressures: max. 12 bar.• Pressure reducing valve provided with an extra large add-on filter (perforation size

0.1 mm) for water application. The add-on filter is also separately.

Accessories• Pressure gauge with rear connection (e.g. fig. 1334, case diameter 63 mm)• Extra large add-on filter

Installation instructions• Install in a horizontal pipe, with spring cap on top

See capacity chart in the introduction

Ordering informationOrdering code Reduced pressure range Approval DN

[bar] ["]143 1.5 - 6 DVGW/KIWA A - 2148 0.5 - 2 A - 2

DimensionsFig. DN L l H h D Weight Kvs-value

["] [mm] [kg] [m3/hour]143 A 140 80 89 58 54 0.7 2.4143 C 160 90 89 58 54 0.85 3.1143 1 180 100 111 64 61 1.3 7.6143 1B 200 105 141 88 72 1.9 9.1143 1A 225 130 173 126 82 3 12.6143 2 255 140 173 126 82 4 12148 A 140 80 148 56 73 1.4 2.4148 C 160 90 148 56 73 1.6 3.1148 1 180 100 185 77 83 2.4 7.6148 1B 200 105 185 77 83 2.8 9.1148 1A 225 130 210 113 102 4.4 12.6148 2 255 140 210 113 102 5.6 12

H

DIL

h

Fig. 143

IL

DH

h

Fig. 148

Pressure reducing valvesBSP threadStainless steel


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Direct-actingBSP female threadHigh pressure• fig. 1535

• Vapour, gases and liquids• D" - 2"• Max. 200 °C• Max. 16 to 100 bar• Max. pressure ratio 40: 1• B" pressure gauge connection• Wetted parts : 1.4571

Entirely stainless steel pressure reducing valve, suitable for vapour, gases and liquids.Due to the applied materials and the high pressure ratio, this pressure reducing valveis suitable for many applications.

Process dataConnection Max. inlet pressure Downstream pressure range (*)D” 16 bar 0.8 – 7.7 barB” - ˘” 63 bar 0.35 – 14.4 barA” 100 bar 0.35 – 52 barC” 63 bar 0.25 – 52 bar

1 ” – 1B” 63 bar 0.25 – 23 bar1A” 63 bar 0.15 – 18.8 bar2 ” 40 bar 0.15 – 18.8 bar(*) Specified pressure ranges can only be attained by means of changing the spring and/or internals.

Pressure ratio• Max. pressure ratio = P upstream: P downstream = 40 : 1• Min. pressure ratio = P upstream: P downstream = 1.1: 1


Material specificationComponent Material EN and/or (DIN) W.nr.Wetted parts Stainless steel X6CrNiMoTi17-12-2 1.4571Other parts Stainless steel X5CrNi18-10 1.4301O-rings FPM (Viton)

Special variants• For lower downstream pressure range• For higher upstream pressures• With NPT female thread connection• With other materials for O-rings• Smaller connection size

Accessories• Pressure gauge with bottom connection (e.g. fig. 334)• Cast iron elbow B" BSP female thread/male thread (e.g. fig. 841)



Ordering informationOrdering code DN

["]1535 D - 2When ordering, specify the following data:- upstream pressure- required downstream pressure

DimensionsFig. DN L1 H H1 Weight Kvs-value

["] [mm] [kg] [m3/hour]1535 D 58 149 36 1.1 0.661535 B 58 149 36 1.1 0.661535 ˘ 70 185 48 1.8 21535 A 90 265 58 3.7 31535 C 90 265 58 3.7 3.51535 1 105 275 68 5.2 6.31535 1B 105 275 68 5.2 71535 1A 145 325 85 9.6 12.51535 2 145 325 85 9.6 13.5

~16

H

H1

L1

DN

Pressure reducing valvesDIN flangesBronze


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Direct-actingFlanges PN 25

Direct-actingFlanges PN 40

• Water and compressed air• DN 15 - 40• Max. 70 °C• Max. 25 bar• Range 1.5-12 bar• Max. pressure ratio 10: 1• B" pressure gauge connection

• Compressed air• DN 15 - 50• Max. 75 °C• Max. 30 bar• Setting range 1.5-20 bar• Max. pressure ratio 6: 1• B" pressure gauge connection



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Direct-actingFlanges PN 25• fig. 141B

• Water and compressed air• DN 15 - 40• Max. 70 °C• Max. 25 bar• Range 1.5-12 bar• Max. pressure ratio 10: 1• B" pressure gauge connection

Simple pressure reducing valve with built-in strainer element (mesh width 0.5 mm) forgeneral industrial applications, aboard ships and in the installation industry. The singleseated balanced disc guarantees a smooth, low-noise operation. The inlet flange andthe outlet flange are both fitted with a B" pressure gauge connection. Due to theconstruction the pressure spring does not contact the medium.Purpose: water, other non-aggressive liquids, compressed air and nitrogen.

Maximum upstream pressure• Max. inlet pressure and temperature 25 bar - 70 °C• Minimum differential pressure 1 bar


Connection• Flanges rated DIN PN 25

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

Body Bronze CuSn5Zn5Pb5-C (G-CuSn5ZnPb (Rg 5)) 2.1096.01Spring cap BrassDisc and seat PlasticDiaphragm NBRDisc sealing ring NBRSpring Spring steelStrainer Stainless steel

Special variants• For lower downstream pressure range: 0.5 - 2 bar (note: has different dimensions)





[bar] [mm]141B 1.5 - 12 DN 15 - DN 40

DimensionsFig. DN L A H h Weight Kvs-value

[mm] [kg] [m3/hour]141B 15 130 95 103 51.5 2.9 3141B 20 150 105 103 51.5 3.6 3.3141B 25 160 115 140.5 77 5.6 8.5141B 32 180 140 140.5 77 7.5 10.1141B 40 200 150 172 114.5 9.5 13.5

H

h

DN A

L



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Direct-actingFlanges PN 40• fig. 147

• Compressed air• DN 15 - 50• Max. 75 °C• Max. 30 bar• Setting range 1.5-20 bar• Max. pressure ratio 6: 1• B" pressure gauge connection

Reliable pressure reducing valve for general industrial applications, aboard ships andin the installation industry. The body is provided with a pressure gauge connection onboth sides. By means of pressure gauges the actual reduced pressure can be read.




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

Body and flanges Bronze CuSn5Zn5Pb5-C (G-CuSn5ZnPb (Rg 5)) 2.1096.01Spring cap (DN 15 - DN 25) BrassSpring cap (DN 32 - DN 50) Cast ironPoppet BrassO-rings NBR

Special variants• BSP threaded connection• BSP threaded connection and a setting range of 20 to 45 bar

Accessories• Pressure gauge with rear connection (e.g. fig. 1334, case diameter 63 mm)

Installation instructions• Install in a horizontal pipe, with spring cap on top. The sizes DN 15 through DN 25

can be installed in a vertical pipe, if required.



[bar] [mm]147 1.5 - 20 DN 15 – DN 50

DimensionsFig. DN L A H Weight Kvs-value

[mm] [kg] [m3/hour]147 15 130 95 188 3.4 1.2147 20 150 105 190 4.4 1.3147 25 160 115 205 5.9 1.6147 32 180 140 337 11.2 4.2147 40 200 150 335 12.1 4.5147 50 230 165 363 17 7.2 DN 15 - DN 25

DN

DN 32 - DN 50

DN A

H

H

A

L

L

Pressure reducing valvesDIN flangesCast iron


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Direct-actingFlanges PN 16• fig. 141GYP


• DN 50 - 200• Max. 16 bar• Range 1.5-8 bar• Max. pressure ratio 10: 1• B" pressure gauge connection

Simple pressure reducing valve for general industrial applications, aboard ships and inthe installation industry. The single seated balanced disc guarantees a smoothoperation. The body is provided with a powder coating and because of the type ofconstruction the spring does not contact the medium.


Downstream pressure range• 1.5 - 8 bar DN 50 - DN 150 pressure gauge connection on in- and outlet flange• 1.5 - 6 bar DN 200 pressure gauge connection on the body



Body Cast ironSpring cap Cast ironDisc (up to DN 150) BrassDisc (DN 200) SteelDisc sealing ring NBRSeat BronzeDiaphragm EPDMSpring Spring steel

Special type• Downstream pressure range: 0.2 - 2 bar (note: has different dimensions)

Accessories• DN 50 - DN 150 pressure gauge : inlet (M39M-A16), outlet (M39M-A10)• DN 200 pressure gauge M07M-A10




[bar] [mm]141GYP 1.5 - 8 ; 1.5 - 6 DN 50 - DN 200

DimensionsFig. DN A L H h Weight Kvs-value

[mm] [kg] [m3/hour]141GYP 50 165 230 282 106 16.2 28141GYP 65 185 290 315 126 28.2 47141GYP 80 200 310 356 154 41.5 70141GYP 100 220 350 418 183 67 110141GYP 125 250 400 487 210 103 180141GYP 150 285 480 573 248 150 250141GYP 200 340 600 1200 305 408 380

Pressure reducing valvesDIN flangesDuctile cast iron


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Direct-actingFlanges PN 25Max. 70 °C

Direct-actingFlanges PN 25Max. 350 °C


• DN 50 - 200• Max. 25 bar• Range 1.5-8 bar• Max. pressure ratio 10: 1• A" pressure gauge connection

• Steam, gases and liquids• DN 15 - 100• Max. 25 bar• Range 0.2-16 bar• Max. pressure ratio 25: 1



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Direct-actingFlanges PN 25Max. 70 °C• fig. 141NOD


• DN 50 - 200• Max. 25 bar• Range 1.5-8 bar• Max. pressure ratio 10: 1• A" pressure gauge connection

Simple pressure reducing valve for general industrial applications, aboard ships and inthe installation industry. The single seated balanced disc guarantees a smoothoperation. The body is provided with a powder coating and because of the type ofconstruction the spring does not contact the medium.


Downstream pressure range• 1.5 - 8 bar (DN 50 - DN 150)• 1.5 - 6 bar (DN 200)



Body Ductile cast ironSpring cap Cast ironDisc (up to DN 150) BrassDisc (DN 200) SteelDisc sealing ring NBRSeat BronzeDiaphragm EPDMSpring Spring steel

Accessories• Pressure gauge with bottom connection (e.g. fig. 334, case diameter 100 mm)• Cast iron elbow A" BSP female thread/male thread (e.g. fig. 841)




[bar] [mm]141NOD 1.5 - 8 ; 1.5 - 6 DN 50 - DN 200

DimensionsFig. DN A L H h Weight Kvs-value

[mm] [kg] [m3/hour]141NOD 50 165 230 282 106 16.2 28141NOD 65 185 290 315 126 28.2 47141NOD 80 200 310 356 154 41.5 70141NOD 100 220 350 418 183 67 110141NOD 125 250 400 487 210 103 180141NOD 150 285 480 573 248 150 250141NOD 200 340 600 1200 305 408 380



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Direct-actingFlanges PN 25Max. 350 °C• fig. 1908

• Steam, gases and liquids• DN 15 - 100• Max. 25 bar• Range 0.2-16 bar• Max. pressure ratio 25: 1

Precise and reliable pressure reducing valve, with pressure relief and sealing bystainless steel bellows, for various industrial applications. A great downstreampressure range is achievable thanks to 5 actuators and 3 springs. For applications witha temperature higher than 100 °C, the a water sealpot is required.Purpose: steam, gases and liquids.

Process dataTemperature (°C)

PN -10 120 200 250 300 35025 25 bar 25 bar 23 bar 21.8 bar 20 bar 17.5 bar

Pressure range Actuator Spring No.0.2 - 0.6 bar DMA 400 040.5 - 1.2 bar DMA 250 040.8 - 2.5 bar DMA 160 072.0 - 5.0 bar DMA 80 074.5 - 10 bar DMA 40 078.0 - 16 bar DMA 40 10


Body and flanges Ductile cast ironDisc, seat and bellows Stainless steelSpring SteelGaskets Graphite

ActuatorDMA 40 80 160 250 400M [mm] 140 170 210 250 300B [mm] 75 75 80 90 135

Condensate vesselActuator Size D [mm] L [mm] V [dm3]

DMA 40-160 1 102 83 0.6DMA 250-400 2 140 110 1.2

Installation instructions• Install in a horizontal pipe with the actuator directed downwards

CapacityCapacity chart on request


[bar] [mm]1908 1) DN 15 – DN 1001) Reduced pressure range

• 0.2 - 0.6 bar • 0.5 - 1.2 bar • 0.8 - 2.5 bar • 2 - 5 bar • 4.5 - 10 bar • 8 - 16 bar

DimensionsFig. DN A DMA 40 DMA 80 DMA 160 DMA 250 DMA 400 L Kvs-value Max.

H G H G H G H G H G dp[mm] [kg] [mm] [kg] [mm] [kg] [mm] [kg] [mm] [kg] [mm] [m3/hour] [bar]

1908 15 95 435 17 435 18 440 19 455 21 495 26 130 3.2 401908 20 105 435 18 435 19 440 20 455 22 495 27 150 5 401908 25 115 440 19 440 20 440 21 460 23 500 28 160 8 251908 32 140 440 21 440 22 440 23 460 25 500 30 180 12.5 251908 40 150 480 26 480 27 480 28 500 30 540 35 200 20 251908 50 165 480 32 480 33 480 34 500 36 540 41 230 32 251908 65 185 485 39 485 40 490 41 505 43 545 48 290 50 201908 80 200 530 61 530 62 530 63 545 65 585 70 310 80 201908 100 235 550 79 550 80 550 81 585 83 610 85 350 125 20G = weight

H

DN

M

L

A

B

Pressure reducing valvesDIN flangesSteel


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Direct-actingFlanges PN 40• fig. 1909

• Steam, gases and liquids• DN 15 - 100• Max. 350 °C• Max. 40 bar• Range 0.2-16 bar• Max. pressure ratio 25: 1

Precise and reliable pressure reducing valve, with pressure relief and sealing bystainless steel bellows, for various industrial applications. A great downstream range isachievable thanks to 5 actuators and 3 springs. For applications with a temperaturehigher than 100 °C, the use of a water sealpot is required.Purpose: steam, gases and liquids.

Process dataTemperature (°C)

PN -10 120 200 250 300 35040 40 bar 36.9 bar 30.2 bar 28.4 bar 25.8 bar 24 bar

Pressure range Actuator Spring No.0.2 - 0.6 bar DMA 400 040.5 - 1.2 bar DMA 250 040.8 - 2.5 bar DMA 160 072.0 - 5.0 bar DMA 80 074.5 - 10 bar DMA 40 078.0 - 16 bar DMA 40 10


Body and flanges SteelDisc, seat and bellows Stainless steelSpring SteelGaskets Graphite

ActuatorDMA 40 80 160 250 400M [mm] 140 170 210 250 300B [mm] 75 75 80 90 135

Condensate vesselActuator Size D [mm] L [mm] V [dm3]DMA 40-160 1 102 83 0.6DMA 250-400 2 140 110 1.2

Installation instructions• Install in a horizontal pipe with the actuator directed downwards

CapacityCapacity chart on request


[bar] [mm]1909 1) DN 15 – DN 1001) Reduced pressure range

• 0.2 - 0.6 bar • 0.5 - 1.2 bar • 0.8 - 2.5 bar • 2 - 5 bar • 4.5 - 10 bar • 8 - 16 bar

DimensionsFigure DN A DMA 40 DMA 80 DMA 160 DMA 250 DMA 400 L Kvs-value Max.

H G H G H G H G H G dp[mm] [kg] [mm] [kg] [mm] [kg] [mm] [kg] [mm] [kg] [mm] [m3/hour] [bar]

1909 15 95 435 17 435 18 440 19 455 21 495 26 130 3.2 401909 20 105 435 18 435 19 440 20 455 22 495 27 150 5 401909 25 115 440 19 440 20 440 21 460 23 500 28 160 8 251909 32 140 440 21 440 22 440 23 460 25 500 30 180 12.5 251909 40 150 480 26 480 27 480 28 500 30 540 35 200 20 251909 50 165 480 32 480 33 480 34 500 36 540 41 230 32 251909 65 185 485 39 485 40 490 41 505 43 545 48 290 50 201909 80 200 530 61 530 62 530 63 545 65 585 70 310 80 201909 100 235 550 79 550 80 550 81 585 83 610 85 350 125 20G = weight

H

DN

M

L

A

B

Pressure reducing valvesDIN flangesStainless steel


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Direct-actingFlanges PN 16-100High pressure• fig. 1536

• Vapour, gases and liquids• DN 15 - 100• Max. 200 °C• Max. 16 to 100 bar• Max. pressure ratio 40: 1• B" pressure gauge connection• Wetted parts : 1.4571

Entirely stainless steel pressure reducing valve, suitable for vapour, gases and liquids.Due to the applied materials and the high pressure ratio, this pressure reducing valveis suitable for many applications.

Process dataConnection Max. inlet pressure Downstream pressure range (*)DN 10 63 bar 0.35 – 14.4 barDN 15 100 bar 0.35 – 52 barDN 20 63 bar 0.35 – 52 barDN 25 – DN 32 63 bar 0.25 – 23 barDN 40 63 bar 0.15 – 18.8 barDN 50 40 bar 0.15 – 18.8 barDN 65 – DN 100 40 bar 0.25 – 12 bar(*) Specified pressure ranges can only be attained by means of changing the spring and/or internals.

Pressure ratio• Max. pressure ratio = P upstream: P downstream = 40 : 1• Min. pressure ratio = P upstream: P downstream = 1.1: 1

ConnectionFlanges rated DIN (*)(*) the applied pressure rating depends on the process data.

Material specificationComponent Material EN and/or (DIN) W.nr.Wetted parts Stainless steel X6CrNiMoTi17-12-2 1.4571Other parts Stainless steel X5CrNi18-10 1.4301O-rings FPM (Viton)

Special variants• For lower downstream pressure range• For higher upstream pressures• With ASME rated flanges• With other O-ring materials

Accessories• Pressure gauge with bottom connection (e.g. fig. 334)• Cast iron elbow B" BSP female thread/male thread (e.g. fig. 841)



Ordering informationOrdering code DN

[mm]1536 DN 10 - DN 100When ordering, specify the following data:- upstream pressure- required downstream pressure

DimensionsFig. DN L H H1 Weight Kvs-value

[mm] [kg] [m3/hour]1536 10 130 185 48 2.3 21536 15 130 265 58 5.8 31536 20 150 265 58 5.8 3.51536 25 160 275 68 7.4 6.31536 32 180 275 68 7.4 71536 40 200 325 85 13.5 12.51536 50 230 325 85 13.5 13.51536 65 290 520 155 34 581536 80 310 520 155 47 501536 100 350 520 155 47 54

~16

H

H1

DN

L

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