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Series 20 Positive Displacement Rotary Pumps

Instruction Manual

 

BYPASS HEAD MODEL 20DX, 20CPX

This TriRotor pump model has an intergral dashpot relief valve-in-head. The standard spring can be set up to 60 PSI at which pressure it will bypass full volume; the heavy duty spring can be set up to 100 PSI.

TO ADJUST BYPASS RELIEF PRESSURE

Remove hexagonal cap (A) and loosen locknut. Turn adjusting screw (B) in to increase pressure and out to decrease pressure. With:
Standard Spring, #J941, (min. 5PSI/Max. 60 PSI). Each full turn represents approx. 2 PSI. Do not exceed 16 total turns.
Heavy Duty Spring, #J2010, (Min. 50 PSI/Max. 100 PSI). Each full turn represents approx. 7 PSI. Do not exceed 11 total turns.

Tighten locknut and replace the hexagonal cap, making sure J1014 gaskets are in place.

                

TO REVERSE DIRECTION OF ROTATION 20DX, 20CPX
The rotation of the 20DX, 20CPX pump may not be reversed in the field for extended periods of time. The pump may be run in reverse TEMPORARILY for such purposes as stripping the lines, etc.

  • To reverse direction of rotation, a bypass head pump of opposite rotation must be ordered from factory. See "putting pump into service" section on page 1.

SOLID HEAD MODEL 20D, 20CP

The model 20D, 20CP has a solid head with the shuttle pin set in a fixed position to give constant volume for simple transfer service. A RELIEF VALVE SHOULD BE INSTALLED IN THE DISCHARGE LINE FOR PROTECTION.

TO REVERSE DIRECTION OF ROTATION 20D, 20CP

The rotation of the 20D, 20CP pump may not be reversed in the field for extended periods of time. The pump may be run in reverse TEMPORARILY fo such purposes as stripping the lines, etc.

  • To reverse the direction of rotation, a solid head pump of opposite rotation must be ordered from the factory. See "putting pump into service" section on page 1.