ARI-STEVI® 425 / 426 (DN300-500)

Control valve – straight through with flanges

ARI-STEVI® 425 / 426 (DN300-500) Control valve - straight through with flanges
Application: Selection criteria: complex control task, critical operating conditions, specific requirements Application: process technology, (heavy-) industrial complex, plant construction, chemical industry, power plant technology
Medium: Refrigerant, cooling water, warm water, hot water, thermal oil, steam, gas, etc.

Scope of applications
Valves are used for „controlling the flow of liquids, gases and vapours in chemical and other processing plants and for plant engineering“.

The information complies to the Pressure Equipment Directive 2014/68/EU.
It is the responsibility of the machine planner to ensure compliance.
The special markings on the valve must be taken into account.
Refer to the catalogue sheet to see which materials are used in standard versions.
Please contact the supplier or the manufacturer if you have any questions.

The control valves are especially suitable for actuation by pneumatic or electrical actuators.
Three plug types are available to suit the various applications:
V-port plug (standard pattern)
perforated plug
pressure balanced plug

The flow through control valves is always against the closing direction.
In the case of control valves with perforated plugs, gases and vapours flow against the closing directions, but liquids flow through in the closing direction.

If a pneumatic actuator is to be used on a straight-way valve with a perforated plug with the fluid moving in the closing direction, a higher closing force will be needed. This is to prevent vibration as the plug approaches the closed position.
If the forces generated by the actuators are too low, arrangements should be made to relieve the pressure as far as this is compatible with service conditions.

Figure Nominal pressure Material Nominal diameter Information / restriction of technical rules need to be observed! A production permission acc. to TRB 801 No. 45 is available.

The engineer, designing a system or a plant, is responsible for the selection of the correct valve.

Resistance and fitness must be verified, contact manufacturer for information (refer to Product overview and Resistance list).

22.425 / 22.426 PN16 EN-JS1049 DN300
34.425 / 34.426 PN25 1.0619+N DN300-500
35.425 / 35.426 PN40 1.0619+N DN300-500
Other materials and versions on request.
Figure Nominal pressure Material Nominal diameter Information / restriction of technical rules need to be observed! A production permission acc. to TRB 801 No. 45 is available.

The engineer, designing a system or a plant, is responsible for the selection of the correct valve.

Resistance and fitness must be verified, contact manufacturer for information (refer to Product overview and Resistance list).

22.425 / 22.426 PN16 EN-JS1049 DN300
34.425 / 34.426 PN25 1.0619+N DN300-500
35.425 / 35.426 PN40 1.0619+N DN300-500
Other materials and versions on request.
acc. to DIN EN 1092-2 -60°C to <-10°C 1) -10°C to 120°C 150°C 200°C 250°C 300°C 350°C 400°C 450°C
EN-JS1049 PN16 (bar) on request 16 15,5 14,7 13,9 12,8 11,2
acc. to manufacturers standard -60°C to <-10°C 1) -10°C to 120°C 150°C 200°C 250°C 300°C 350°C 400°C 450°C
1.0619+N PN25 (bar) 18,7 25 23,9 22 20 17,2 16 14,8 8,2
1.0619+N PN40 (bar) 30 40 38,1 35 32 28 25,7 23,8 13,1

Valve with extended bonnet, studs and nuts made of A4-70 (at temperatures below -10°C)

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