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AT 2311

Butterfly valve

High quality tight butterfly valve, SEMI-LUG performance with a fixed vulcanized rubber lining in the body. Also suitable for vacuum and as a end valve with lever, worm gear or actuators. With a long neck for insulation.

Dimension rangeDN50 to DN2200
PN16/10
Temperature range-20ºC to 110ºC
MaterialCast iron

Product information

Main facts

Dimension rangePNTemperature rangeMaterial

DN 50-1400

10/16-20 ºC to +200 ºCCast iron

Range of Application

Soft seal , butterfly valve for shut-off and control of hot and cold water, air and other neutral gases. For example, tap water, wastewater, sea water, oils and glycol mixtures. See also: "Selection of Butterfly Valves".

 
NBR-lining:0°C to +90°CHydrocarbon compounds with up to 30% aromatics at +20 ° C, water, powder, air and neutral gases.
EPDM-lining:-20°C to +110°CTap water, some alcohols (max 30%), certain diluted inorganic acids.
EPDM Hightemp: -20°C to +130°CHot or cold water with extended temperature range.
Viton-lining:0°C to +200°CHydrocarbon compounds, oils and hot air.

The valves are corrossion protection painted according to EN12944 class C3 as a standard. Other classes on demand.

Product Range

PSB.2 Butterfly valve
Butterfly valve AT 231x with body of gray iron, fixed vulcanized rubber liner of NBR/EPDM and disc of stainless steel.
Butterfly valve AT 2314 with body of gray iron, fixed vulcanized rubber liner of NBR and disc of alubronze.
Butterfly valve AT 2319 with body of nodular iron, fixed vulcanized rubber liner of Viton and disc of stainless steel.
With long stem neck (up to DN200) for insulation and mounting wholes for one sided flange mounting.
AT 231xS with standard shaft up to DN150,
AT 231xV with standard gear from DN200.

Quality Assurance

Testing is performed according to SS-ISO 5208 edition 2, leakage rate A, applies to the valve type.
Certificate SS-EN 10204 2.2 from most of the classification authorities can be delivered.
Certificate SS-EN 10204 3.1 can be supplied on special order.
Type of certificate has to be specified upon ordering.
End valve DN 50–200 max. 10 bar, DN 250–300 max. 6 bar.

CE-marking.
AT 2310-2319 are in compliance with PED 2014/68/EU category 1 as a standard.
Other categories are available on request.

Material Specification

AT 2310AT 2311AT 2312AT 2313AT 2314AT 2319
1BodyJL1040JL1040

JL1040

JL1040JL1040JS1030
2Disk
(DN 50-600)1.40571.40571.4462 Duplex1.4462 DuplexG-CuAl10Ni1.4462 Duplex
(DN 700-1600)1.40571.40571.4517 Duplex1.4517 DuplexG-CuAl10Ni1.4517 Duplex
3Shafts1.40571.40571.44621.4462CuAl10Ni5Fe41.4462
4LinigNBREPDMNBREPDMNBRViton®
5BushingSteel-PTFESteel-PTFESteel-PTFESteel-PTFESteel-PTFESteel-PTFE
seal ringCopperCopperCopperCopperCopperCopper
PluggSteelSteelSteelSteelSteelSteel
6Standard corrosion protection (SS-EN 12944)C3C3C3C3C3C3

Dimension and Weight

DNABB*CDEFGWeight
5043118152341070100633,1
6546126160341070115713,9
8046133167341070130784,2
10052147189341270150965,5
125561602023412701821097
1505618022434167021013310
2006020424834167026215814
25068245452410231519422
30078270452410237121932
35078315452410240525640
400102363503014047030875
450114388503014052233490
5001274135030140576360120
6001545105040140672426180
7001655606046165776480295
8001906106046165880525345
9002036907060254980635475
100021674070602541085685635

B* AT 2310-11 with long steam neck for insulation. DN 50-200.
Measurments in mm, weight in kg.

Function and Design

Fully tight, maintenance-free butterfly valve with centrically placed disc , split stem, one-piece body with fixed vulcanized rubber lining, eliminating risk of contact corrosion and protecting body internally against corrosion and also serving as flange packing. The manufacturing process ensures excellent seal and increased longevity because the abrasion of the liner is eliminated. Disc profile is crucial for achieving good flow characteristics which ultimately leads to energy losses are minimized. The valve is sealed regardless of flow direction.

Body with SEMI-LUG mounting wholes for one sided mounting.
AT 2310 and AT 2311 are equipped with mounting holes up to DN 300. Porting pattern acc. to PN16 up to DN 200 and PN10 for DN250-300.
AT 2312, AT 2313 and AT 2314 are equipped with mounting holes up to DN 200.
Due to this design, the valve will keep its seal function even with one sided flange mounting, as an example end valve.

Disc and shaft are connected by one or more strong conical pins.
Butterfly valve AT 2310-11 DN 50–200 is delivered with long stem neck as standard for insulation.

Face to face dimension acc. to SS-EN 558.
Top flange acc. to ISO 5211.

Standard corrosion class C3 acc. to ISO 12944.
When the installation is done outdoors without rain cover, class C4 is recommended.

Technical Information

Pressure and temperature
Fig. NoDNWorking pressureWorking temperature.
Max barMax °C
AT 231050-20016*90
AT 231150-20016*120
AT 231350-30016*120
AT 2314/231250-30016*90
AT 2310250-160010**90
AT 2311250-160010**120
AT 2313350-160010120
AT 2312/2314350-16001090
AT 231950-160010**200
* End of the line valve DN 50-200 Max. 10 bar (e).
**End of the line valve DN 250-300 Max. 6 bar (e).

Kvs-Torque

KVs-value and Torque
DNKvs-valueTorque (Nm), Differential pressure (bar)
AT 2310/2311AT 2312/2313AT 23142,561016
509595959101011
6523123123113131415
8049149149117181921
10069069069028303236
12514501450145039424652
15019451945194560677586
200409540954095120130140160
250608560854260300320350400
300957095706360420450490560
35013500135008975310360410660
4001635016350101304605406401020
4502155021550127306307408501400
50017000170001700084097011201800
600248102481024810910110019003100
7003447034470344701500190032005200
8004554045540455402100260044007000
90058290582905829029003800640010200
100073510735107351038004900810013000
1200108400108400108400590079001300021000
14001514001514001514009000120002000032000
1600203200-20320012000170002900046000
The torque applies for standard valves:
- Temperature 0≤80 °C
- Liquids
- Gases always at diff.pressure 6 bar or specially finished disc PN6
- Viton®-lining always at Dp 10 bar
- Manoeuvering min. 10 times/year.

Kv A

Kvs-value
Opening angle°
DN20405060708090
503132444729095
657224479136212231
80154282135231378491
1002182148246414660690
1254412523237065011101450
15058225383592101616911945

200

123352599967161528784095
25018362611511939328951546085
30028798418093050517281059570
35040513882553430372961143413500
40049116813091521188371384816350
450647221640756868116471825221550
Applies for AT2310/2311/2312/2313/2319 DN50-450 and AT2314 DN50-200

Kv B

Kvs-value
Opening angle°
DN2030405060708090
2501712995549381493247436254265
30025444576312722099343455336360
35026935971811671885314155658975
4004057171271222238765774878610130
45050981014782497421167161038012730
500680106919433283545287301367717000

600

9921560283647917956127411996124810
700137921673941665611054177012773334470
800182228635206879414604233863663945540
9002332366566641125618693299334689758290
10002940462284041419523574377495914273510
110037185844106251794729804477277477592940
1200433668161239220933347625566687213108400
14006056951917308292374855277748121808151400
15007044110722013234006564739043214681176100
1600812812776232303924065163104348163484203200
Applies for AT3210/2311/2312/2313/2319 DN500-1400 and AT2314 DN250-500

Accessories and Options

- Body of nodular iron
- Body with monoflange for end of line mounting DN250-1000
- Disc of nodular iron – epoxy coated
- Polished disc Ra 0,1
- Maschined disc PN 6 (undercut disc)
- Rubber-lining by EPDM special (-30°C to +120°C)
- Rubber-lining by FPM (-0°C to +200°C)
- Rubber-lining by NBR for natural gases according to DVGW-gas
- Surface finish, corrosion class C4, C5
- Alternative pressure class
- Extended stem in different performances
- Flanged valves, see series AT 2340

- Hand manoeuvring

The valves are delivered as standard with lever for DN 50–150 (AT 2390) or with worm gear (AT 2394) in all DN. or with worm gearAT 2394SPRwith internal limit switches.

Accessories
AT 2390R
blockable and lockable fine-slip with 20 positions, for lever
AT 2390Llockable plate with 10 positions, for lever
AT 2390KONTplate with 2 mechanical Honeywell limit switches, for lever
AT 2395limit position open/closed for worm gear,
Proxymatly sensors erected on worm gear, type of sensors to be stated in the order. Lock chain mounted on the worm gear.

- Automatic manoeuvering
The valves can be supplied withATactuators program adapted for compact direct mounting, for pneumatic, hydraulic or electrical operation.

Installation

The valve shall be mounted between flanges,without gasketsand if possible with the shaft in horizontal position and min. measurement for the disc movement acc.to table below. End of line mounting, bults and nuts are not allowed to be tightened with more than:

Flanges

DNFlanges according toDNMax torque Nm
50-200SS-EN 1092 PN1650-125100
250-300SS-EN 1092 PN10/16150-300250
350-1600SS-EN 1092 PN10

Disc diameter

Disc placement in the system
DNXY
50263,5
65469,5
806617
1008624
12511234,5
15014047
20019170
25024192
300290114
350327130
400373142
450421161
500470180

How to order

Example: AT 2310V200-1014
Butterfly valve, NBR lining, stainless disc with worm gear and extra surface coating C4
ValveLiningManoeuvringDNFlangeSurface coating
231X0= NBR/stainless steel- = Free shaft end200= DNPN101014= C4
1= EPDM/stainless steelS= warm gearPN161015= C5
2= NBR/acidproof steelV= lever
3= EPDM/acidproof steel
4=NBR/alu-bronze
9= Viton®/acidproof steel