Air intake prevention on a D8IL3000 EX ATEX-certified water-powered proportional dosing pump is primarily achieved by ensuring suction-side tightness and matching suction conditions to the chemical properties. Below is a professional technical checklist to stabilize priming and maintain accurate proportional dosing.
1) Suction line tightness and fittings (highest priority)
Verify all clamps and fittings are fully tightened and correctly seated; check the PTFE suction hose and connectors for any micro-cracks or imperfect sealing that can allow air ingress under vacuum.
Inspect and renew sealing elements (O-rings, gaskets) on the suction strainer, foot valve, and unions with seal materials compatible with the dosed chemical.
Keep the foot valve fully submerged and avoid vortex formation in the chemical tank (use an anti-vortex device or position the foot valve away from agitation and tank walls).
2) Suction lift and hydraulic optimization (1.75 m lift)
Minimize suction lift whenever possible; a 1.75 m lift increases vacuum level and requires careful reduction of suction losses to maintain prime with demanding fluids.
Reduce pressure losses by using adequately sized suction tubing, limiting hose length, and ensuring the suction strainer and foot valve remain clean and unobstructed.
Maintain stable motive water conditions (sufficient inlet pressure and flow stability) to support consistent pump cycling and prime retention.
3) Check valves and compatibility selections (for consistent priming)
Keep suction check valves clean and in good condition; deposits or contamination can prevent proper closure and affect priming stability.
Select the appropriate seal set according to the additive (acidic, alkaline, oxidizing, or highly concentrated chemicals). Using the correct wetted materials supports long-term tightness and dosing reliability.
4) Recommended best practices for robust field performance
Perform a suction-side tightness check (vacuum or pressure test as per site procedures) and implement preventive replacement of seals on critical suction assemblies.
For viscous or cold liquids, reduce viscosity impact by optimizing installation (shorter suction line, larger diameter) and, where acceptable for the process, conditioning the product (temperature management or dilution in line with the chemical supplier recommendations).
Result: With a properly sealed suction line, optimized suction hydraulics, and correct material compatibility, the D8IL3000 EX provides stable priming and reliable non-electric proportional dosing for demanding water treatment applications, including sites requiring ATEX compliance.
