Dixon RZL-400, Operating And Maintenance Manual, Page: 14 / 78

14 Rotary Lobe Pumps - RZL-400 Series 800.789.1718
Installation & Start Up
Proper Installation (continued)
Relief Loop:
• Relief Valve – To protect the pump and piping system against excessive pressure, a relief valve should be installed. An integral
relief valve, designed to bypass the fluid internally from the pump outlet to the inlet, should not be used on applications where the
discharge must be closed for more than a few minutes. Prolonged operation of the pump with closed discharge with cause heating
of the fluid circulating through the relief valve.