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Specialty Pump Types

Hollow Tube Two Stage: HWB, HHB

HWB and HHB are precision API insert pumps with either a cup or mechanical bottom anchor (hold-down). Recommended for deep wells with low fluid levels, these pump assemblies are installed in the well on the end of the sucker rod string and seated in the seating nipple installed in the tubing string at a predetermined depth.

The upper ball and seat in the traveling unit gives the pump a two stage effect. On the downstroke, the fluid load is taken by this ball and seal allowing the traveling valve to open sooner, preventing gas lock.

Pressure due to fluid load in the tubing acts on the 0.0. of the barrel and the 1.0. of the barrel above the plunger.

HWB – designed for use in shallow depth wells

HXB – designed for use in deeper depth wells

HHB – designed with heavy wall barrel and extension for stroke through configurations

Features

  • Effective gas-lock prevention where moderate to severe gas is present.
  • Two stage check valve prevents sediment settling during intermittent pumping.
  • Constructed with a more rugged hollow tube than API insert pumps, for heavy duty service.
  • Balanced pressure around the barrel overcomes the disadvantages of a top anchor pump. Fluid only passes through the anchor and standing valve to be in the producing chamber of the pump.
  • HHB pump uses a hollow tube in place of a valve rod.
John Crane Production Solutions HWB HHB