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Safety Valve AT 4546

Full lift safety valve. Flanged connections. Grey iron. Soft seated (EPDM) disc. DN25/40-150/2500, PN16-40. Bellows of EPDM-rubber.

Dimensionsområde25-100
PN16
Temperaturområde-10 till +150°C
MaterialGråjärn

Variations

Article number Amount
AT 4546

Product information

Main facts

Dimension rangePNTemperature rangeMaterial

DN 15-150

16-10°C to +150 ºC Grey iron/EPDM

Range of Application

Safety valve for e.g. low pressure steam boilers and steam vessels.
Also suitable for water system when large discharging capacity is required.

Quality Assurance

Approved by TÜV and several other classification authorities.
Fulfils the requirements according to ISO 4126.
Certificate SS-EN 10204, type 2, 3 and from most of the classification authorities.
Valve of grey iron can not be obtained with material certificate type 3 (3.1 certificate)
Type of certificate has to be specified upon ordering.

CE-marking
Meets the requirements in AFS 2016:1 and 2014/68/EU (Pressure Equipment Directive) according to category IV, fluids group 1 and 2.


Material Specification

1 Body0.6025/grey iron GG-25
2 Seat 1.4404/316L
3 Disc1.4122 + EPDM /hardened stainless steel + EPDM
4 Spindle1.4021/420
5 Spring 1.1200, 1.8159, 1.7102, 1.4310/carbon steel
6 Guide 0.7040, 1.0501, 1.4104/
ductile iron Gr.60-40-18, SA 216 WCB
7 Bonnet0.7040/ductile iron Gr.60-40-18l
8 Spring plate (2)1.0718/steel
9 Adjusting srew 1.4104 PTFE/chrome steel PTFE
10Lever (3) 0.7040/nodular iron Gr.60-40-18
11Soft sealingEPDM
12Rubber bellow EPDM

Dimension and Weight

DN Inlet253240506580100
DN Outlet40506580100125150
Flow diameter23293746607492
A max234331372419529606663
B100110115120140160180
C105115140150170195220
D150200250300350400450
Weight9121622325675
Measurements in mm, weight in kg, (3) = open lifting device.
For measurements DN125-150 see AT4541-series

Function and Design

Spring loaded and directly acting safety valve for air, gases and steam with full lift opening characteristics.
For liquids, the safety valve has normal opening characteristics.
Large discharging capacity.
Open lifting device, closed bonnet.
Rubber bellow of EPDM to protect moving parts and spring against dirt and corrosion.

Technical Information

Overpressure
The safety valve is fully open at an overpressure exceeding the set pressure with a maximum of 5 %.
Max 10 % for liquids, when the valve has standard opening characteristics.
For set pressure lower than 1,0 bar, the overpressure is set pressure + 0,1 bar.
If lower overpressure is requested please contact Armatec.

Blowdown

Blowdown

Blowdown

Steam/air/gases:Max 10% at set preassure ≥3,0 bar
Max 0,3 bar at set preassure<3,0 bar
Liquids:Max 20% at set preassure ≥3,0 bar
Max 0,6 bar at set preassure <3,0 bar
If lower blowdown pressures are required please contact Armatec

Pressure and temperature

Max. set pressureTemperature range
DNbar °C
25-15010-10°C to +150

Soft sealing + rubber bellows

Ethylen (EPDM), max 150°C, for e.g. hot water and low temperature steam.

The disc can be obtained with soft sealing of other elastomers, see How to order

Additional information

Sizing based on submitted data can be performed on request.
Please state: Fluid, density (for liquids), capacity/power, maximum temperature and set pressure
Bar implies bar gauge: bar(ö), bar(g), bar(e), atö or kg/cm2 if nothing else is stated.
Nm3/h implies "free" capacity air/gas (N=normal) and is equal with m3/h if other is not stated.

Coefficient of discharge steam/gasαd D/G
0,7

Flow diameter Do, see table Dimension and Weight.

Sizing DN20-40

DN 20 25 32 40
Seat 18 mm 23 mm 29 mm 37 mm
Pset
barSteam AirWaterSteam WaterSteam Air WaterSteam Air WaterSteam
0,2 93 1103544 152 5789 241 2879200393 46615000608
0,5 144 1775011 236 8189 374 46013000610 74821222943
1 210 2636789 342 11078 544 68417667887 1111286671367
2 336 4279600 548 15667 870 1108248891411 1800405562189
3 451 58011778 737 19222 1167 1500305561900 2444496672944
4 72813556 22111 188935222306757333
5 87615222 24778 226739444370064111
6 102416667 27111 265643111432270222
7 116718000 29333 303346667494475889
8 131119222 31333 342249778557881111
9 146720333 33222 381152889620086000
10 161121444 35000 418955667683390667
12 191123556 38444 496761000807899333
14 220025444 41444 5733658899333107333
16 250027111 44333 65007044410589114444
Pset = set pressure
According to applied standards the value above should be multiplied with the safety factor 0,9.
Saturated steam in kg/h. Air in Nm3/h (free air) at 0ºC and atmospheric pressure 1013 mbar(a). Water in kg/h at 20ºC.
Capacities are given for an overpressure of 10% of set pressure.
Contact Armatec for sizing with other fluids etc.

Sizing DN50-100

DN 5065 80 100
Seat 46 mm60 mm 74 mm 92 mm
Pset
barSteamAirWaterSteam Air WaterAir WaterAir Water
0,2 60872023111033 122239333185659889287892556
0,5 9431156327781600 1967556672989847784622131111
1 13671711443332322 29227544444441144446878177778
2 21892778626673722 4733106667721116222211111251111
3 29443778767885011 6433131111978919888915111306667
4 47448866780781511111222222888919000354444
5 57119911197331688891477825666722778396667
6 6689108556113331844441722228111126667434444
7 7656117778130002000001977830333330556468889
8 8622125556146672133332222232444434444501111
9 9589133333162222266672477834444438333532222
10 10556140000178892388892733336222242222561111
12 12444153333212222611113233339777849889614444
14 14333165556245562822223733342888957667663333
16 16333177778277783011114233345888965444708889
Pset = set pressure
According to applied standards the value above should be multiplied with the safety factor 0,9.
Saturated steam in kg/h. Air in Nm3/h (free air) at 0ºC and atmospheric pressure 1013 mbar(a). Water in kg/h at 20ºC.
Capacities are given for an overpressure of 10% of set pressure.
Contact Armatec for sizing with other fluids etc.

Sizing DN125-150

DN 125 150
Säte 98 mm 125 mm
Pset
barSteam Air Water Steam Air Water
0,2 2756 3267 105111 44785311 171111
0,5 4278 5244 148889 69568533 242222
1 6211 7811 201111 1011112667 327778
2 9933 12556 284444 1611120556 463333
3 13333 17111 348889 2166727889 566667
4 21556 402222 35000 654444
5 25889 450000 42222 732222
6 30333 493333 49333 802222
7 34667 532222 56444 865556
8 39111 568889 63667 925556
9 43444 603333 70778 982222
10 47889 636667 77889 1035556
12 56667 696667 92222 1133333
14 65444 753333 106556 1222222
16 74222 804444 120000 1300000
Pset = set pressure
According to applied standards the value above should be multiplied with the safety factor 0,9.
Saturated steam in kg/h. Air in Nm3/h (free air) at 0ºC and atmospheric pressure 1013 mbar(a). Water in kg/h at 20ºC.
Capacities are given for an overpressure of 10% of set pressure.
Contact Armatec for sizing with other fluids etc.

Accessories and Options

Test Gag for blocking the safety valve
Lift stopper
Valve of different materials without rubber bellow, see series AT 4541
Valve of different materials with stainless steel bellow, see series AT 4547

Installation

ConnectionFlanges drilled acc. to
InletDIN EN 1092-1, PN16
OutletDIN EN 1092-1, PN16
See separate installation instruction. The valve should be mounted with the bonnet in vertical position.

Maintenance and Spare parts

See separate installation and maintenance instruction.

Marking

Manufacturer, Armatec article number, DN, PN, CE-marking, material and arrow showing the flow direction.
TÜV approval label with manufacturer fig. no. 440 mounted on body.
Set pressure is punched on the outlet flange and on the TÜV approval label.
The valve is painted red, unlike other the non stainless valves which are painted blue.

How to order

Soeft seated safety valve with EPDM rubber bellows
Example: AT 4546D3-5,0-25
AT 4546D3-5,0 -25
Fig. no.O-ringDesignSet pressure (barg)DN
AT 4546=grey ironD=EPDM2=gas tight cap

N=Nitrile3=open lifting device
L=Viton
K=Neoprene