Georg Fischer 561 Specifications
Type 561/562 Cone Check Valve
Standard Features
• Size
3/8”–4”
• Material
» Body: PVC, CPVC, PROGEF Standard,
Polypropylene, SYGEF PVDF, ABS
» Spring (562 only): Stainless Steel
» Optional: Nimonic C/Hastelloy C,
Halar coated Nimonic C
• Connection
Socket, Threaded,
Spigot (PVDF and PP only)
• Seals
EPDM or FPM
• Sealing Pressure
Type 561: 2.9 PSI
Type 562: 1.45 PSI
General
The Type 561/562 Cone Check Valve family is used to automatically stop flow in the back direction when the fluid in the
line reverses. The valve closes when vertically mounted with (561) 2.9 PSI or (562) 1.45 PSI. The new check valve Type 562
(horizontal) closes absolutely leak-tight with the built-in spring, even in the de-energized state — without water column as
well as in a horizontal position. The union design (3/8” to 4”) allows for easy replacement or repair in the field. The valve is
available in PVC, CPVC, Polypropylene, PVDF, and ABS, matching easily with most plastic piping systems.
New generation check valve types
561, 562
Technical features
Types
All types are available in the dimension DN10 up to
DN100.
Type 561 (without spring)
FPM (fluoro rubber)
• High temperature resistance
• Better chemical resistancethan EPDM, except for
bases
• Very good diffusion properties
Exploded drawing
Type 562 (with spring)
Materials
Additional chapters of the "Georg Fischer Planning Fundamentals" contain the material properties as well as
chemical resistances for the different types of materials.
Please take this into consideration.
The valve body is available in the following materials:
• PVC, CPVC, ABS
• PROGEF Standard
• SYGEF Standard, SYGEF Plus
Below are the offered sealing materials and a short explanation of their properties:
EPDM (ethylene propylene diene)
• Standard / All-round sealing material
• Good chemical resistance except foroil
• Very good at hot water
• High temperature resistance
• Conform to FDA
• Miscellaneous drinking water approvals
1 Coupling nut
2 Connecting part
3 O-ring
4 Screw-in ring
5 Sealing ring
6 Back-up ring
7 Cone
8 Spring (type 562)
9 Housing
2
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