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It specifies self-acting floater-and-cone operation requiring no auxiliary energy, outlines suitable materials and approvals, and includes pressure-temperature diagrams for 25-year service 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Ordering-Spigots  \n• Spare parts  \n• Accessories  \nTechnical Datasheet  \nType 591/595 Ventilating and Bleed Valve  \nVentilating and bleed valves enable the controlled release and intake of air in piping systems and tanks. They are used in water treatment, chemical processing, food and beverage, microelectronics, and cooling applications. The valves are suitable for gaseous and liquid media free of solid particles and are designed for defined pressure and temperature ranges.  \n• Type 591 (large-orifice): kinetic air discharge during filling and air admission during draining  \n• Type 595 (air inlet only): designed for reliable vacuum breaking  \n• Self-acting operation based on floater and cone mechanisms  \n• No auxiliary energy required for fully automatic operation  \n• Reliable vacuum protection through controlled air admission  \n• High operational safety during filling and draining processes  \n• Compact, maintenance-free design for easy system integration  \nImportant note: Not suitable for continuous air release during pressurized operation. Use Air Release Valves or Combination Air Valves for this function.  \n06/2026-A 1271497  \nThe information and technical data (altogether “Data”) herein are not binding, unless explicitly confirmed in writing. The Data neither constitutes any expressed, implied or warranted characteristics, nor guaranteed properties or a guaranteed durability. All Data is subject to modification. The General Terms and Conditions of Sale of Georg Fischer Piping Systems apply.  \n© Georg Fischer Piping Systems Ltd, 8201 Schaffhausen/Switzerland  \nTel. +41 52 631 11 11 • [www.gfps.com](www.gfps.com) • [E-Mail: info. ps@georgfischer.com](E-Mail: info. ps@georgfischer.com)  \nTechnical data  \nSpecifications Type 591 Type 595  \nFunction  \nDimensions Materials  \nPressure levels  \nFlow media  \nProduct standard Test standard  \nApprovals  \nValve body Gasket  \nFloater  \nSpring  \nPN16  \nPN10  \nAir release and intake Vacuum breaking (air inlet)(large-orifice)  \nd16/DN10 – d110/DN100, ⅜” – 4”  \nPVC-U, PVC-C, ABS, PP-H, PVDF  \nEPDM, FKM  \nPP-H, PVDF PVC-U, PVC-C, ABS, PP-H, PVDF  \n- Standard: Halar (ECTFE) coated Optional: Nimonic 90, Stainless steel V2A  \nPVC-U, PVC-C, PVDF  \nPP-H, ABS  \nMedia that are free of foreign particles, viscous, thick and gaseous media.  \nThe chemical resistance depends on the selected material (see online tool ChemRes   \nPLUS) .  \nEN ISO 16137  \nISO 9393-2, EN 12266-1  \nACS, FDA, DIBt, TA Luft, NAMSA  \nPressure-temperature diagrams  \nThe following pressure-temperature diagrams are based on a service life of 25 years and water or similar media. T Temperature (°C, °F)  \nP Permissible pressure (bar, psi)  \nPVC-U  \nT (°F)  \n-58 -38 -18 2 22 42 62 82 102 122 142 162 182  \n17  \n16  \n15  \n14  \n13  \n12  \n11  \n10  \nr)  \nP ( ba  \n9 8  \n7 6  \n5  \n4 3  \n2  \n1 0  \n\n|  | | | | | |  | |  | |  | |  |  |  |  |  | |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | PV |  | C-U |  |  |  |\n|  |  | P | N16 |  |  |  |  |  |  |  |  |  |  |  | Typ 59 |  | 1 595 |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | |\n| |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  | |  |  |  |  |  |  |  |  |  |  |  |\n|  |  | P | N10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  | |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  | |  |  |  |  |  |  |  |  |\n|  |  ","cbCainUMweO4NPxV","https://ap.wps.com/l/cbCainUMweO4NPxV","pdf",4086153,"English","# Quick navigation\n## Technical data\n## Installation notes\n## Dimensions and Ordering-Sockets\n## Dimensions and Ordering-Spigots\n## Spare parts\n## Accessories\n## Technical datasheet\n### Type 591/595 Ventilating and Bleed Valve\n### Specifications\n### Pressure-temperature diagrams","[{\"question\":\"What is the purpose of ventilating and bleed valves in piping systems and tanks?\",\"answer\":\"They enable controlled release and intake of air, supporting safe filling and draining and providing vacuum protection through controlled air admission.\"},{\"question\":\"How do Type 591 and Type 595 differ in function?\",\"answer\":\"Type 591 (large-orifice) performs kinetic air discharge during filling and air admission during draining, while Type 595 (air inlet only) is designed for reliable vacuum breaking.\"},{\"question\":\"What operating principle and energy requirement do these valves have?\",\"answer\":\"They operate self-acting using floater and cone mechanisms and require no auxiliary energy for fully automatic operation.\"}]","Technical Datasheet - Type 591/595 Ventilating and Bleed Valve | PDF",1792969952]