Water Stop Valves (AVW Type)


Water Stop Valves of AVW type presented here are suitable for use under conditions of highest pressures, temperatures and outputs. Water stop valves are used in all branches of industry where piping has to be 100 % sealed against high pressure differentials.

Design and Function

The valve body has a lateral inlet connection and is fitted with a seat welded in place which can be exchanged, and has a close fitting expansion cone. The valve stem and cone are made in one piece. The stem is mounted to be free from vibration and is guided in a bush in the valve cover and another bush in the valve core. Cover and valve are fastened together by a clamping device which facilitates assembly.

The noise level is kept low because of a special design of 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 can be opened 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
1.4922 X20CrMoV12-1
1.5415 16Mo3 A182 F1
1.6368 15NiCuMoNb5-6-4
1.7335 13CrMo4-5 A182 F1

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