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  • Backing Ring Welding Procedure (.doc)
    Robvon Backing Rings are inserted into the beveled pipe end with the spacer nubs flush against the pipe land and the ring gap positioned in the area of first bead deposition. The beveled end of the adjoining pipe is slipped onto the Robvon backing ring until the edge of the pipe land is firmly
  • The Case for Vacuum Boosters, and the Case for Tuthill
    it is placed in series with another vacuum pump. The booster then provides higher pumping capacity and lower pressures typically at lower cost and power consumption. The backing pump can be an oil-sealed piston or vane pump, a liquid ring pump sealed with a variety of different sealants from water

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