Ventilating and bleed valve Type 591 ABS PN10

  Datasheet (PDF)

The Georg Fischer Type 591 ABS ventilating and bleed valve provides reliable automatic deaeration and vacuum aeration for industrial thermoplastic piping systems. Designed for process installations, this valve releases entrapped air during system filling and continuous operation while drawing in atmospheric air during pipe drainage to prevent negative pressure collapse. BigWeld supplies this valve across Europe as an authorised Georg Fischer distributor for industrial piping systems, ensuring nominal pressure resistance up to PN10 at 20 degrees Celsius across metric dimensions d16 to d110.

Technical specifications

The Type 591 ventilating and bleed valve operates automatically using an internal floating mechanism engineered for exact buoyancy in liquid media. When fluid enters the valve chamber, the aerodynamically shaped floater rises to create a positive seal against the seat, preventing process fluid leakage while venting air, and drops instantly during system depressurisation or drainage to admit air.

• Body material: Acrylonitrile butadiene styrene (ABS)
• Floater material: Polypropylene homopolymer (PP-H)
• Protection hood: PP-GF (sizes DN10 to DN50) or POM (sizes DN65 to DN100)
• Nominal pressure rating: PN10 (10 bar at 20 degrees Celsius)
• Connection type: Metric solvent cement sockets from d16 to d110 (DN10 to DN100)
• Function: Continuous automatic venting, pipe filling deaeration, and vacuum relief

Applications

This ABS ventilating and bleed valve is engineered specifically for non-corrosive process pipelines, cooling systems, and water treatment infrastructure. Acrylonitrile butadiene styrene offers high impact strength even at low operating temperatures, making it a dependable choice across challenging process plant environments.

Typical system integrations include chilled water loops, industrial cooling installations, municipal and industrial water treatment plants, marine engineering systems, and potable water conveyance networks where air accumulation or vacuum events could damage pipe integrity.

Installation and jointing

Installation of the Georg Fischer Type 591 ABS valve requires metric solvent cement jointing into matching ABS pipelines using approved Tangit ABS solvent cement and cleaner. The valve must be mounted vertically at the highest points of the pipeline or directly at potential air entrapment locations to function properly.

The valve body design allows straightforward radial mounting and dismounting without extensive disassembly of surrounding pipework. The upper protective hood shields the venting orifice from environmental debris, dust, and external mechanical interference, ensuring uninterrupted automatic operation across the lifetime of the installation.