Low-Pressure Volumetric Dosing System for Chilled Water 1

Low-Pressure Volumetric Dosing System for Chilled Water 2

Low-Pressure Volumetric Dosing System for Chilled Water 3

Low-Pressure Volumetric Dosing System for Chilled Water 4

Low-Pressure Volumetric Dosing System for Chilled Water 5

Low-Pressure Volumetric Dosing System for Chilled Water 6

Low-Pressure Volumetric Dosing System for Chilled Water

A low-pressure volumetric dosing system for chilled water gently and precisely adds small amounts of treatment chemicals into HVAC chilled-water loops to control corrosion, scale, and biological growth. It keeps the system clean and efficient, reducing energy use and protecting chillers and pipes. Key selling points: accurate volumetric dosing, safe low-pressure operation, simple install and low maintenance, less chemical waste, remote monitoring/control options, and longer equipment life with lower downtime and costs.

brand name:

QILEE

Shipping:

Support Sea freight

Payments:

L/C,D/A,D/P,T/T,Western Union,MoneyGram,OA

Lead Time:

1-1(sets):60(days),>1(sets):To be negotiated(days)

Place of Origin:

China

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size

2000*1000*1700

Suitable for medicament

Electronic control

0,1

Maximum number of instruments

Pump type

Diaphragm pump

Pump qty

4sets

Maximum flow rate

1000LPH

Processing Type

desalination

Power(W)

2 kW

Product name

Chemical Dosing System For Chilled Water

Voltage

220 V, 380 V

weight (kg)

100

productivity

500L/Hour

warranty

1 Year

place of origin

Shanghai, China

core components

Motor

machinery test report

Provided

video outgoing-inspection

Provided

Precise Compact Reliable Dosing

Engineered for chilled-water treatment, this low-pressure volumetric dosing solution delivers precise, automatic addition of coagulants, polymers and pH adjusters to optimize coagulation, sludge dewatering and process control while linking to on-site DCS and online sensors for real-time adjustment. Built as a compact, skid-mounted unit with choice of screw or diaphragm metering pumps, stainless-steel framing, safety and back-pressure valves, filters and easy-clean piping, it combines high-quality modular construction with secure standard export carton packing for fast, damage-free delivery. The QWDS Polymer dosing system offers scalable models with automatic pump switching and flow-based dosing to minimize chemical use, simplify maintenance and ensure reliable, cost-saving operation.

Precise Volumetric Chilled Dosing

The QWDS Polymer dosing system is a low-pressure volumetric unit for chilled water treatment that delivers automatic, metered addition of acids, alkalis, PAC, PAM and other coagulants or polymers to support regulation, coagulation and sludge dewatering processes. Core and extended attributes include selectable screw or diaphragm pumps in modular multi-pump layouts, integrated online sensors for pH, residual chlorine, DO and suspended solids, and standard safety/maintenance fittings such as back-pressure and safety valves, filters, pressure gauges and cleaning pipelines. Functionally engineered for automatic pump switching and DCS linkage with dosage calculated by total flow and concentration, it provides stable, safe and efficient chemical management that reduces operator intervention and optimizes treatment performance.

Low Pressure Chilled Dosing

The QWDS Polymer dosing system is a low-pressure volumetric chemical dosing unit designed for chilled water applications, providing automatic metering of acids, alkalis, PAC, PAM and other reagents for coagulation, regulation and sludge dewatering. Equipped with screw or diaphragm metering pumps, safety valves, back-pressure valve, filters and online monitoring options (pH, residual chlorine, DO, suspended solids and sludge concentration), it ensures stable, safe and accurate dosing. Models support multiple pump configurations up to 2000 LPH per pump and can be integrated with onsite DCS for automatic dosage matching to flow and process concentration.

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Precise Low-Pressure Chilled-Water Dosing

Backed by a heritage of water-treatment innovation and rigorous process engineering, the QWDS Polymer dosing system was developed to provide reliable low-pressure volumetric polymer addition for chilled water applications. It combines precise volumetric metering, digital flow control, corrosion-resistant wetted components, and modular compact construction to ensure stable polymer concentration, easy integration into HVAC loops, and simple field servicing. Key features and advantages include low-pressure operation to minimize system stress, energy-saving dosing algorithms, self-priming capability, low-maintenance consumables, and clear diagnostics that reduce chemical waste, extend equipment life, and lower total cost of ownership.

Material introduction

The QWDS Polymer dosing system employs corrosion-resistant stainless steel frames and chemical-resistant plastics such as polypropylene and PVDF for tanks and piping to withstand acids, alkalis, PAC and PAM. Wetted parts and seals use PTFE and EPDM diaphragms with high-performance polymer linings, while pumps are selectable as imported screw or diaphragm units with robust metallic and polymer components suited for polymer dosing. Standard safety components — back-pressure and safety valves, filters, diaphragm pressure gauges and cleaning pipelines — are made from durable materials to ensure stable, low-pressure volumetric dosing for chilled water.

◎ Corrosion-Resistant Stainless Steel

◎ Chemically-Inert Tank Materials

◎ Wear-Resistant Wetted Components

FAQ

What is a low-pressure volumetric dosing system and how is it used in chilled water applications?

A low-pressure volumetric dosing system meters a precise, repeatable volume of treatment chemical into a chilled water loop each stroke or cycle. It’s specifically designed to operate against the relatively low backpressures found in HVAC chilled-water systems. Typical uses include injecting corrosion inhibitors, scale inhibitors, antifreeze/glycol make-up, and biocides to protect chillers, cooling coils, piping and heat exchangers in commercial buildings, data centers, hospitals and light industrial cooling circuits.

Which chemicals can be dosed with this type of system and what limitations should I consider?

These systems commonly dose corrosion inhibitors, passivators, scale preventatives, non-oxidizing biocides and glycol-based antifreeze. Limitations depend on the pump construction and wetted materials—strong oxidizers, abrasive slurries, high-viscosity fluids or solvents may be unsuitable. Always check chemical compatibility with the pump’s seals, diaphragms and housing and consult the manufacturer for corrosive or reactive chemistries.

What are the typical installation and operating requirements for integrating the dosing system into a chilled water loop?

Install the dosing unit near the chemical supply (drum/tank) with a short suction line and a proper suction strainer. The injection point should be downstream of a bypass or mixing point where good dispersion into the chilled-water flow is achieved, and include a non-return check valve on the injection line. These pumps are intended for low backpressure service—verify system backpressure against manufacturer limits. Provide electrical power and, if needed, a control signal (analog, pulse or remote start/stop) from the BMS or controller. Ensure safe access for maintenance and adequate secondary containment for the chemical supply.

What advantages does a low-pressure volumetric dosing system offer compared with higher-pressure or proportional pumps?

Advantages include very consistent volumetric accuracy per stroke (good for low-flow chilled water loops), simpler mechanical design, lower energy use and reduced stress on piping and fittings. They are easier to install in systems with low head, can be gentler on shear-sensitive chemistries, and often require less maintenance than high-pressure pumps. They are particularly cost-effective when treating closed chilled-water circuits where only modest injection pressure is needed.

How should I maintain, calibrate and troubleshoot the dosing system to ensure reliable performance?

Perform periodic inspections—check for leaks, worn diaphragms/seals, clogged suction strainers and air entrainment in suction lines. Calibrate by collecting the output over a known number of cycles and comparing to the expected volumetric output; adjust stroke or cycle rate as required. Common issues: air locks (bleed suction line and ensure proper priming), under-dosing (check for worn seals or partially blocked injection/check valve), and erratic dosing (verify consistent suction supply, electrical control signals and that the pump speed control is functioning). Follow the manufacturer’s recommended service intervals and spare-parts lists.

What safety, environmental and regulatory precautions should be followed when using the system?

Store and handle chemicals per their Safety Data Sheets—use appropriate PPE, chemical-resistant hoses and proper labeling. Provide secondary containment for drums and the dosing unit to catch spills. Ensure the injection point and dosing quantities comply with water quality and discharge regulations for your facility (particularly for biocides). Train staff on safe handling, emergency procedures and waste disposal. Keep records of dosing rates and maintenance for regulatory compliance and water-treatment audits.

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