EV-2 and EV-3 Metering Pumps

The EV-2 and EV-3 metering pumps feature a special, heavy-duty design capable of handling all of your high-pressure chemical, viscous and slurry services. Features include a sealless, single-flat diaphragm and simplex, duplex or multiplex feeds. A variety of metallic and non-metallic liquid end cartridge materials are also available.

Operating Specifications

• Flow range: 14 gph (53 l/h) to 2,000 gph (7,570 l/h) with independent flow control for each feed
• Pressure range: to 3500 psig (241 bar)
• Maximum temperatures:
  Metallic to 250°F (121°C)
  Non-metallic to 150°F (66°C)
  
• Steady state: ± 0.5% of flow setting
• Linearity: ± 1% of full flow
• Repeatability: ± 2% of full flow
• Turn down ratio: 10:1 (optional 100:1)

Options

• Flat double diaphragm with three levels of DURAlert leak detection.
• DURAmatic electronic actuation.
• Variable speed drive.

Drivecase Cartridge

• Amplitude modulation design offers smoother flow transfer at lower stroke settings, especially in high-pressure/high-flow services.
• Two drivecase sizes of identical design.
• Multiplexing allows as many as eight feeds with one motor.
• Fully isolated drivecase provides superior bearing and gearset life.
• Maximum power transfer provides efficient operation.
• Accepts standard four-pole squirrel cage induction motors.

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Stroke Adjuster Cartridge

• Spin handle, 0% to 100% digital readout manual stroke adjustment.
• Available with DURAmatic electronic stroke control.

Hydraulic Cartridge

• Utilizes enhanced Evolution Series hydraulic system for superior resistance to system and operational upset. Multiple fluids handling capability and long, trouble-free service.
• Eight EV-2 plunger sizes with 1-3/8" (35 mm) stroke length; eleven EV-3 plunger sizes with 2" (51 mm) stroke length.
• Hydraulic plunger seal offers better process control through improved accuracy, especially at low stroke settings.
• Integral air bleed valve assures accuracy by venting captured air. Internal porting eliminates potential oil leakage.
• Mechanical refill valve provides excellent suction lift capability. Pumps high vapor pressure liquids without modification to existing systems.

Liquid End Cartridge

• Hydraulically balanced single diaphragm design, without process side contour plate, permits use in almost any service condition.
• Pumping action is developed by positive sealing ball check valves.
• Optional check valve arrangements (double ball, soft or hardened seats) for special applications.
• Handles viscous or slurry streams with low-cost, single diaphragm.
• Offset check valves eliminate "settling in" operations and maintenance problems.
• Flow-through porting positively vents all air from liquid end upon start-up or when pumping air-entrained materials.
• Check valve assembly may be rebuilt for economical maintenance.
• Standard wet end materials include 316SS, Alloy 20, Hastelloy®, PVC and Kynar®. Most machineable metallic and non-metallic materials are available.

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