Walchem EZB11D1-VCA Metering Pump → Now the EWP-035BVC07A-USL
Original price was: $614.00.$465.20Current price is: $465.20.24% OFF
This model has been upgraded. The Walchem EZB11D1-VCA has been discontinued and replaced with the EWP-035BVC07A-USL, its direct 1:1 equivalent — same PVC wet end, same connection size, and fully compatible spare parts.
Purpose-built for off-gassing chemicals like sodium hypochlorite, this pump’s Auto Degassing Valve automatically vents trapped gas from the pump head, preventing vapor lock and maintaining consistent output. It delivers 0.6 GPH at up to 150 PSI, with durable PVC construction for excellent chemical resistance.
The upgraded model now features an 1800:1 turndown ratio (up from 360:1) for finer dosing control and an IP66-rated housing for added protection. Already have an EZB11D1-VCA installed? Your spare parts kit (N11VCA-PK) remains fully compatible — no need to requalify your stock.
Technical Specifications
| Specification | Details |
|---|---|
| Model | EWP-035BVC07A-USL (replaces EZB11D1-VCA) |
| Flow Rate | 0.6 GPH (35 mL/min) |
| Pressure Rating | Up to 150 PSI (1.0 MPa) |
| Pump Type | Diaphragm metering pump with Auto Degassing Valve |
| Wet End Material | PVC pump head |
| Valve Balls / Seat | FKM |
| Connection Size | ⅜” OD x ¼” ID |
| Power Supply | 100–240V AC (universal) |
| Control Type | Manual dials (Stroke Rate / Stroke Length) |
| Turndown Ratio | 1800:1 |
| Ingress Protection | IP66 (water/dust-proof) |
| Special Feature | Auto Degassing Valve — for off-gassing chemicals |
| Recommended For | Sodium hypochlorite, chlorine, hydrogen peroxide |
| Included | Foot valve, injection valve, 20 ft. polyethylene tubing, ceramic weight |
| Spare Kit | N11VCA-PK |
Out of stock
Precision Dosing with the Walchem EZB11D1-VCA Metering Pump
The Walchem EZB11D1-VCA Metering Pump delivers smooth and consistent chemical dosing through high-speed 360 SPM solenoid operation. As a result, it eliminates slug feeding, improves accuracy, and reduces diaphragm wear compared to slower-stroke pumps.
In addition, the PVC degas head prevents gas buildup and maintains reliable dosing when handling volatile or off-gassing chemicals. At the same time, the dual-bearing armature support stabilizes internal movement, which reduces vibration and extends diaphragm life.
Operators can easily adjust output using manual stroke controls. This allows flow regulation from zero to 100% of rated capacity. Consequently, chemical usage is optimized, maintenance needs are reduced, and overall system efficiency improves.
Available through Water Treatment Supply, the Walchem EZB11D1-VCA combines durability, precision, and ease of use, making it an excellent choice for water treatment and industrial chemical feed applications.
Specifications and Applications of the Walchem EZB11D1-VCA Metering Pump
Now shipping as the EWP-035BVC07A-USL, the direct, factory-authorized replacement for the EZB11D1-VCA.
The Walchem EZB11D1-VCA Metering Pump is a compact, high-performance dosing pump built for accuracy, reliability, and ease of use. The manufacturer has upgraded this model to the EWP-035BVC07A-USL. It now delivers a maximum output of 0.6 gallons per hour (GPH), or 35 mL/min, at up to 150 PSI. That makes it a chemical metering pump designed for precision in water treatment, cooling tower, and industrial process systems.
What sets this model apart is its built-in Auto Degassing Valve. Off-gassing chemicals such as sodium hypochlorite release gas inside the pump head, which can cause vapor lock and loss of prime. However, the auto degassing valve vents this gas continuously. As a result, the pump keeps dosing accurately with minimal operator attention. In addition, a very high compression ratio further improves priming and venting.
The Walchem EZB11D1-VCA lineage also ensures excellent chemical compatibility. Its liquid end combines a PVC pump head, alumina ceramic valve balls, FKM seats and seals, and a PCTFE diaphragm bonded to EPDM. Therefore, it handles chlorine-based disinfectants and a wide range of other treatment chemicals, even in demanding environments.
The pump runs on 115V single-phase power with a standard US power cord; a 230V version is also available. Its solenoid-driven diaphragm design provides leak-free dosing for continuous or intermittent operation. Moreover, dual bearing support on the armature and shaft extends the life of the diaphragm and mechanics.
Operators can fine-tune performance with two simple physical dials for stroke rate and stroke length. At up to 360 strokes per minute, the pump reaches an 1800:1 turndown ratio for precise chemical feed. It also accepts external proportional control by analog or pulse input. Combined with its IP66-rated housing and optional wall-mount base, the EWP-035BVC07A-USL is easy to install and built to last. Walchem also backs the entire pump with a 2-year warranty.
Every pump ships with 3/8″ OD x 1/4″ ID connections, a foot valve, an injection valve, 20 ft of LLDPE tubing, and a ceramic weight.
Whether used in disinfection systems, cooling tower treatment, or industrial water conditioning, the Walchem EZB11D1-VCA Metering Pump, now the EWP-035BVC07A-USL, delivers the accuracy and durability that maintenance professionals and engineers rely on.
Already have an EZB11D1-VCA installed? Your existing N11VCA-PK spare parts kit remains fully compatible with the new model, so there is no need to requalify maintenance stock.
Use Cases & Industry Applications
- Disinfection & Chlorination Systems: The Walchem EZB11D1-VCA (EWP-035BVC07A-USL) is ideal for dosing sodium hypochlorite. Its auto degassing valve prevents vapor lock, so chlorine feed stays consistent in water treatment and potable water systems.
- Water Treatment Systems: It provides precise, consistent chemical dosing for pH control, disinfection, and corrosion prevention in treatment plants.
- Cooling Towers: It works well for oxidizing biocide feed in cooling tower systems, helping prevent biofilm growth and keeping system efficiency high.
- Boilers & Closed-Loop Systems: The EZB11D1-VCA, rated at 0.6 GPH and 150 PSI, maintains accurate chemical feed for water conditioning and helps protect equipment.
- Commercial & Institutional Facilities: From HVAC systems to pools and building water management, this Walchem metering pump supports safe, reliable dosing of off-gassing chemicals.
No replacement parts listed for this item yet.
FAQs
Q1. What is the Walchem EZB11D1-VCA used for?
The Walchem EZB11D1-VCA metering pump provides precise chemical dosing in water treatment, cooling tower, and disinfection systems. Its auto degassing valve makes it especially well suited for off-gassing chemicals such as sodium hypochlorite. This model now ships as the EWP-035BVC07A-USL, its direct factory replacement, with the same applications and PVC construction.
Q2. Has the Walchem EZB11D1-VCA been discontinued?
Yes. The manufacturer has replaced the EZB11D1-VCA with the EWP-035BVC07A-USL, a confirmed 1:1 equivalent per Walchem’s official EWP Series crossover matrix. All orders for the EZB11D1-VCA now ship as this upgraded model. It keeps the same PVC liquid end, the same auto degassing configuration, and a fully compatible spare parts kit.
Q3. What is the flow rate and pressure capacity of this pump?
The EWP-035BVC07A-USL delivers up to 0.6 gallons per hour (GPH), or 35 mL/min, at a maximum pressure of 150 PSI. That is an increase from the original 0.5 GPH (30 mL/min) rating, while the 150 PSI pressure capacity stays the same.
Q4. What does the auto degassing valve do?
Chemicals like sodium hypochlorite release gas inside the pump head. Over time, this gas can cause vapor lock and loss of prime. The auto degassing valve vents the gas continuously, so the pump keeps dosing accurately without manual bleeding. In addition, the pump’s high compression ratio further improves priming with off-gassing products.
Q5. Can this pump handle corrosive or aggressive chemicals?
Yes. The liquid end combines a PVC pump head, alumina ceramic valve balls, FKM seats and seals, and a PCTFE diaphragm bonded to EPDM. As a result, the EZB11D1-VCA / EWP-035BVC07A-USL is compatible with sodium hypochlorite and a wide range of other water treatment chemicals. Always confirm compatibility for your specific chemical and concentration.
Q6. Is the Walchem EZB11D1-VCA suitable for continuous operation?
Yes. Dual bearing support on the armature and shaft extends diaphragm and mechanical life at up to 360 strokes per minute. The pump also offers an 1800:1 turndown ratio for fine, consistent chemical feed. Moreover, Walchem backs the entire pump with a 2-year warranty.
Q7. What are the power requirements for this pump?
The EWP-035BVC07A-USL runs on 115V single-phase power and includes a standard US power cord. A 230V version is also available: replace “US” with “UH” in the model code (EWP-035BVC07A-UHL).
Q8. Will my existing EZB11D1-VCA spare parts still work?
Yes. Both models use the same N11VCA-PK spare parts kit, so there is no need to requalify your maintenance stock.
Q9. What comes included with the pump?
Every pump ships with a foot valve, an injection valve, 20 ft of LLDPE polyethylene tubing, and a ceramic weight. Connections are 3/8″ OD x 1/4″ ID.
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