Article written by David Gardellin of Onyx Valve Co A progressing, or progressive cavity pump consists of a single helix metal rotor that turns inside a double helix rubber stator. This forms a series of pockets that traverse the length of the pump, gently pushing fluid from the suction to the discharge in a smooth, [...]
Category Archives: White Papers
Mechanical vs. Solid State Pressure Switches
June 25, 2009 – 8:23 PM
Article written by David Gardellin of Onyx Valve Co Onyx Isolator Rings have traditionally been supplied with mechanical gauges and mechanical switches to monitor process pressure and pump performance. These do a fine job, but many users are changing over to solid state switches. This paper will discuss some of the advantages of each. Principle [...]
The Effects of Capillary Tubing on Pressure Measurement
June 24, 2009 – 9:47 PM
Article written by David Gardellin of Onyx Valve Co Capillary tubing introduces three effects on the performance of pressure-sensing instruments: 1. Temperature effects. Temperature changes cause the liquid inside the capillary tube to expand and contract, changing the volume of the fill fluid. The resulting error is a function of the total volume of the [...]
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