Blackmer adds to DEF transfer pump line

Blackmer is providing the STX2A-DEF sliding vane pump, designed specifically for use in applications that require the handling of diesel exhaust fluid (DEF).

DEF became an increasingly important part of the motor-fuel supply chain in January 2010, when the US Environmental Protection Agency's Tier 2, Stage IV Emission Standards for Light-Duty and Heavy-Duty Vehicles went into effect. One technology chosen by vehicle and engine manufacturers to facilitate this nitrogen oxide (NOx) reduction is called selective catalytic reduction (SCR), which injects DEF — a mixture of 32.5% chemical urea and 67.5% deionized water — into the vehicle's exhaust system where the NOx is then converted into harmless nitrogen and water vapor.

Blackmer designed its new STX2A-DEF pump to be compatible with DEF similar to its STX3-DEF and STX1220-DEF predecessors, but at lower flow rates end-users require — from 15 to 60 gpm (60 to 227 lpm).

Other features of the STX2A-DEF pump include:

  • Meets ISO 22241 material standards and cleanliness specifications required for DEF applications

  • 316 stainless steel construction

  • Push rods allow for slower pump speeds of 350-780 rpm

  • Maximum viscosities of 4,600 SSU (970 cSt)

  • PTFE elastomers

  • 90-degree porting with weld flanges

  • Dimensional interchangeability with Blackmer TXD2, TXD1220, and STX1220A pump models

  • Standard Duravanes

  • Ball-bearing construction with PTFE chemical mechanical seals

  • Internal adjustable relief valve

  • Three drain ports for draining in any mounting position

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