Automatic recirculation valves – KM 9903.1 117 (Z40)

Flanged automatic recirculation valve (vertical lift-type check valve with automatic relief) – type KM 9903.1 117 (Z40) is designed to protect pumps against reverse flow of the pumped fluid. If the pressure of the fluid in the piping system after the pump exceeds the value of the pressure generated by the pump and the fluid starts flowing back, the disk closes the check valve automatically and the piston opens the flow to the bypass. The pumped fluid is then discharged through the bypass to the discharge pipe which mouths into the pump tank. In this way the pump can run with a minimum quantity of the fluid without the necessity of being put out of operation in order to protect it against damage by overloading. No external power source is required.





Technical specification

• nominal diameter from DN 50 to DN 400
• nominal pressure up to PN 100
• temperatures from −50°C to +550°C

Applications

• water with the exception of potable water
• fluids included in PED 97/23/EC Group 2 (all non dangerous fluids)

Connection types

• flanged automatic recirculation valves
• butt-welding automatic recirculation valves

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