The Dual Diaphragm Water Pump 12V 7.9L/Min is a heavy-duty, high-flow positive displacement diaphragm pump engineered for efficient fluid transfer, high-pressure agricultural spraying, marine washdown systems, off-grid water circulation, and automated misting installations. Driven by an efficient 12V DC permanent magnet motor and an integrated dual-chamber santoprene diaphragm assembly, it produces smooth, pulsation-damped liquid delivery up to a rated flow rate of 7.9 liters per minute (approx. 2.1 GPM). Featuring an integrated automatic pressure cutoff switch and self-priming capability up to several meters, this versatile pump operates safely even in dry-run scenarios without structural damage, delivering stable hydraulic pressure across diverse DIY, vehicle, and industrial watering applications.

Specifications

• Operating Voltage: 12.0 V DC (Nominal)
• Operating Voltage Range: 10.5 V to 14.4 V DC
• Rated Current Consumption: Approx. 4.0 A to 6.5 A (Load and pressure dependent)
• Maximum Peak Current: Up to 8.0 A to 10.0 A (Under peak cutoff pressure)
• Maximum Open Flow Rate: 7.9 L/min (Approx. 2.1 Gallons/min)
• Working Pressure / Cutoff Threshold: Approx. 0.6 MPa to 0.9 MPa (6.0 bar to 9.0 bar / ~85 to 130 PSI)
• Pump Chamber Design: 2-Chamber Positive Displacement Dual Diaphragm
• Diaphragm Material: High-Durability Santoprene (Chemical, acid, and tear resistant)
• Valve Material: Viton / EPDM Synthetic Elastomer (High chemical stability)
• Self-Priming Lift Capability: Approx. 2.0 m to 3.0 m vertical suction head
• Maximum Discharge Head: Approx. 30 m to 50 m
• Automatic Pressure Switch: Integrated Pressure Sensing Switch (Auto shutoff when outlet closes, auto restart on valve open)
• Inlet / Outlet Port Dimensions: 10 mm (3/8 Inch) Hose Barb or 1/2-Inch NPT Threaded Ports
• Allowed Fluid Temperature: 0°C to +60°C (32°F to 140°F)
• Duty Cycle: Intermittent Working Cycle (Recommended continuous run time ≤ 60 to 90 minutes per session)
• Mounting Base: Anti-Vibration Heavy-Duty Rubber Mounting Feet
• Net Weight: Approx. 1.1 kg to 1.3 kg

Features

• Dual Diaphragm High-Flow Geometry: Dual-chamber displacement smooths hydraulic flow, decreases line pulsing, and pushes high volumes up to 7.9 L/min compared to standard single-head micro pumps.
• Integrated Pressure Demand Switch: Automatically powers off the electric motor when downstream line pressure reaches the cutoff threshold (e.g., closing a spray gun or ball valve) and restarts instantly upon opening.
• Reliable Self-Priming & Dry-Running: Capable of lifting liquid above tank levels without pre-flooding the line; withstands extended dry-running intervals without scoring or mechanical seizure.
• Vibration-Damping Mounting Feet: Soft elastomeric mounting tabs isolate motor resonance from vehicle frames, wooden decking, and plastic water tanks to keep operational noise low.
• Corrosion-Resistant Fluid Path: Built with high-grade synthetic polymer diaphragms and viton check valves compatible with water, agricultural pesticides, liquid fertilizers, and mild chemical washes.

Common Applications

• Agricultural & Garden Spraying: Backpack or ATV/tractor-mounted pesticide spray rigs, boom sprayers, and automated crop misting systems.
• RV, Camper & Marine Water Systems: Pressurized domestic freshwater distribution for sinks, onboard showers, and deck washdown setups.
• Solar & Off-Grid Irrigation: Drip-irrigation lines, hydroponics nutrient feeding, and small greenhouse watering systems driven by 12V battery banks.
• High-Pressure Cleaning & Washing: Portable vehicle washing kits, outdoor solar panel cleaning wands, and mobile HVAC coil wash equipment.
• Bulk Liquid Transfer: Rapid water transfer between storage barrels, IBC totes, and rainwater harvesting cisterns.

Usage Tips

• Inlet Filtration Requirement (CRITICAL):
  • Diaphragm pumps rely on internal one-way check valves to create displacement suction. Always install an in-line sediment strainer/filter (50 to 80 mesh) on the water inlet line.
  • Silt, sand, or plant particulates drawn from open tanks will lodge under the check valves, causing loss of prime, lower flow rates, or continuous cycling when the outlet is closed.
• Power Supply Sizing:
  • When running from an AC-to-DC converter or benchtop power supply, use a regulated 12V DC power supply capable of at least 10A output.
  • Diaphragm pump motors draw substantial inductive starting surge current (up to 8A–10A) when building maximum line pressure. Undersized power adapters (<6A>
• Hose & Fitting Installation:
  • Use reinforced, thick-walled flexible PVC or braided tubing on the suction side to prevent hose collapse under strong negative vacuum.
  • Secure all barb connections with stainless steel hose clamps to prevent air leaks, which can degrade self-priming performance.
• Pressure Switch Fine-Tuning: The central Allen bolt on the front pressure switch cover adjusts the cutoff threshold. Turn clockwise to increase cut-in/cut-out pressure or counterclockwise to lower it. Avoid over-tightening, as setting the cutoff beyond the motor's capability will prevent automatic shutoff and overheat the motor.
• Freeze Protection: Drain the pump chamber thoroughly before storing in freezing ambient temperatures. Trapped residual water will expand into ice, cracking the plastic pump head assembly.