Steam Stop Valves (AVW Type)


Steam Stop Valves of AVW type are applied for highest values of pressure, temperature and mass flow capacities. Steam control valves are used as pressure isolating valves in all types of the industry where piping has to be 100 % free of steam.

Design and Function

The valve body has horizontal inlet connections firmly welded, whereas the seat and the joined conical widening are removable. The valve stem with its plug as well as the cone are made in one piece. The stem is pivoted vibration-free between a bush in the valve cover and another bush in the valve seat. Cover and valve are fastened together by a clamping device which facilitates assembly.
The noise level is kept low by the special design of the internal parts. The pulse from the control unit causes the valve drive to change position of valve cone. The gap between the seat and the cone allows the medium to flow. The valve opens against the pressure of the medium. A complete seal in the closed position is secured.

Technical Data

– Throttling plug for low differential pressure
– Single- or multi-stage trim
– customised
– acc. to DIN / EN Standard; other on request

Nominal size: DN50 – DN600 / NPS 2″ – 24″, other on request

Pressure rating: PN160 – 720 / Class 900 – 4500, other on request

Pressure difference: all pressure differences, high pressure difference with multi-stage valve type

Characteristic: on – off; regulating on request

Flow direction: flow to close; flow to open on request

Design: forged steel-welding construction, angle-, globe-, z-type

Connections: welding ends, flanges

Actuators: manual, electric, pneumatic, hydraulic


All materials are according to DIN or ANSI / ASTM. For the main parts of our valves we use standard material as listed below or according to our customer specifications.

1.0460 C22.8 A105
1.4541 X6CrNiTi18-10
1.4571 X6CrNiMoTi17-12-2
1.4903 X10CrMoVNb9-1 A182 F91
1.4922 X20CrMoV12-1
1.5415 16Mo3 a182 F1
1.7335 13CrMo4-5 A182 F1
1.7380 10CrMo9-10 A182 F22

Contact Us


Armaturen Union GmbH
Erkrather Straße 401
D-40231 Düsseldorf


Phone & Fax

Tel: +49 211 5455 92 30
Fax: +49 211 5455 92 39