Application
A check valve, or non return valve, is a valve that prevents the fluid from flowing backwards and ensures that it flows in only one direction. It can be used to prevent the loss of prime of the pump and water hammer.
The valve is widely used in water loops.
Operating principle
The check valve opens when the pressure of the fluid exceeds the pressure exerted by the spring. When the two pressures are compensated, the valve closes. A higher counterpressure will ensure the valve closes.
When there are two pumps operating alternately, the check valves are installed at the outlet of each pump to prevent the backflow when the pump is stopped. The obturation disc is provided with a perforation for a minimal circulation flow to avoid water stagnancy.
Certificates
Design and features
Available sizes: DN 25/1" to 100/4"
Easy assembly/disassembly with the clamp.
Reduced size design.
Connections: Clamp OD.
Traceability of components.
Options
Gaskets: NBR, FPM or PTFE.
Welding connections.
Perforation in the obturation disc.
Material and surface roughness certificates.
ATEX version.
Materials
Parts in contact with the product: AISI 316L (1.4404)
Other stainless steel parts: AISI 304 (1.4301)
Spring: AISI 302 (1.4319)
Gasket: EPDM according to FDA 177.2600
Internal surface finish: Ra ≤ 0,5 μm
External surface finish: Machined (turned)
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