Internal Flush Line
The P31 Series offers an optional internal seal flush to extend
operating temperature to 250°F.
Integrated Relief Valve
P31 Pumps are available with or without a built-in relief valve*.
The relief valve temporarily protects against dangerous over-pressure.
All relief valves are preset at the factory to your specifications
(60 to 100 psi range available). At the specified relief valve
setting, the flow will fully by-pass from the outlet to the
inlet through the relief valve chamber. The specified relief
setting is an average; individual pumps will vary both above
and below the specified setting. The relief valve actually
cracks open and begins to by-pass flow at approximately 50
the relief valve setting. The standard relief valve is made
of a special high temperature plastic.
Optional Motor Capabilties
All P31 pumps can fit onto ultra compact 36 Frame UL and CE approved
motors, as well as Standard MTH dual face motors. Optional
motors with higher horsepowers, solid state starting, TEFC
and 3 phase capabilities are also available.