Bellows Type Valves - The "technically leakproof" solution

With very hazardous media even a minimal leak rate can be too great. In cases like these, you can use tried and tested AS-Schneider Bellows Sealed Valves.

To move the valve stem upwards and downwards without leaks, a multi-layer, metal bellow is used that is welded on the one side to the stem and on the other side to the valve bonnet. Therefore a leakage along the valve stem is not possible.

“Technically leak-proof” properties:

• Fully flushed, multi-layer stainless steel bellows secured against rotating, designed for 2,500 mechanical cycles
• Bellows welded on one side to stem and on other side to valve bonnet
• Non-rotating valve tip in Stellite 6 material
• Safety packing
• Available pressure classes: PN 100, PN 250, PN 400 on request

Shut-off Valves A4 Series

Standard Features:

• Orifice ø10
• Non - rotating valve tip
• Extended bonnet to maintain the stem packing and stem thread at low temperature
• Metal to metal back seat
• Compensation of thermal expansion between body and stem
• Electron beam welded bonnet

Available Materials:

• 1.4901 (F92) type approved by TÜV
• 1.4981
• 2.4663 (Alloy 617) type approved by TÜV

Monoflanges

The AS-Schneider Monoflanges are designed to overcome the problems of traditional assemblies on primary isolation duties. By combining piping and instrument valves in a single assembly, they provide weight and space savings, along with other benefits including reduced potential leak points and safer hook-up. This more compact and efficient arrangement reduces not only pipework vibration and associated stress but also installation and maintenance costs.