Mecair VNP216 2 Inch Double Diaphragm Pulse Jet Valve Kv 78

The Mecair VNP216 is a high-flow, threaded pulse jet diaphragm valve developed for reverse-pulse cleaning systems in industrial dust collectors and baghouses.

Its defining configuration combines a G 2-inch female threaded connection, two diaphragms and an integrated solenoid pilot. With a flow coefficient of Kv 78 and Cv 90.7, it provides substantially greater compressed-air flow than smaller 1-inch and 1½-inch models.

The inlet is positioned at 90 degrees to the outlet, allowing the valve to connect directly between the compressed-air header and blowtube arrangement. This right-angle structure simplifies installation in conventional pulse-cleaning systems.

The double-diaphragm construction supports fast opening and closing for a concentrated cleaning pulse. This helps dislodge accumulated dust from filter bags, cartridges, envelope filters, ceramic elements and sintered-metal-fibre filters.

The body and cover use anodized die-cast aluminum for environmental and corrosion protection. Stainless-steel screws, diaphragm backing components and springs are used in the internal assembly.

Key Differentiating Features

• G 2-inch female threaded connection
• Double-diaphragm internal construction
• Integrated solenoid pilot
• High-flow Kv 78 and Cv 90.7 rating
• Operating pressure range of 0.5–7.5 bar
• Right-angle inlet and outlet arrangement
• Designed for reverse pulse-jet filter cleaning
• Anodized die-cast aluminum body
• Stainless-steel internal hardware
• Standard NBR diaphragm
• Class H coil insulation
• IP65 DIN electrical connector
• Multiple AC and DC coil-voltage options
• Approximately 2.5 kg valve weight

Why the Double-Diaphragm Design Matters

The VNP216 uses two diaphragms instead of the single diaphragm found in smaller models such as VNP206, VNP208 and VNP212.

The secondary diaphragm assists the main diaphragm during opening and closing. This arrangement is used in the larger 2-inch valve to provide a rapid response while controlling a greater volume of compressed air.

For dust collectors with larger blowtubes or more filter elements per pulse, the 2-inch double-diaphragm configuration can provide more suitable airflow than a smaller single-diaphragm valve.

Actual cleaning performance still depends on header pressure, tank volume, blowtube diameter, nozzle design, pulse duration and filter arrangement.

Integrated Solenoid Pilot

The VNP configuration includes a solenoid pilot mounted directly on the valve. It can receive an electrical pulse from a compatible dust-collector controller without requiring a separate remote pneumatic pilot enclosure.

This distinguishes the VNP216 from the corresponding VEM216, which uses a remote pneumatic pilot connection.

The complete order code must include the required coil voltage and frequency. Available coil configurations include selected DC and 50/60 Hz AC versions.

Do not order only by the basic VNP216 number when replacing an existing valve. Verify the coil label and complete suffix before purchase.

Model Comparison

The VNP216 is differentiated from the VNP214 by its larger 2-inch connection and substantially higher Kv 78 flow coefficient. Compared with the VNP220, it provides a smaller 2-inch connection and lower overall weight.

Typical Applications

• Baghouse filter cleaning
• Cartridge dust collectors
• Cement production dust extraction
• Mining ventilation filtration
• Silo and bulk-material handling
• Conveyor transfer-point dust control
• Powder processing equipment
• Ceramic filter cleaning
• Metalworking dust extraction
• Power plant dust collection
• General industrial air filtration
• Replacement of an existing VNP216 valve

Installation and Selection Notes

Use filtered, oil-free compressed air within the specified pressure range of 0.5–7.5 bar.

Confirm that the pipework has a G 2-inch female threaded interface. NPT and other thread standards should not be assumed to be interchangeable.

Install the valve in the permitted orientation and avoid mounting it upside down. Ensure that the compressed-air header and blowtube do not place excessive mechanical load on the valve body.

Check the complete coil code before wiring. Coil voltage, AC frequency and electrical power depend on the selected version.

The DIN connector provides IP65 protection when correctly assembled with the appropriate seal and cable entry.

When replacing the diaphragm, use the correct double-diaphragm repair kit for the VNP216. The standard repair assembly is identified as KIT DB 116/C; diaphragm material must match the required temperature and process conditions.

Frequently Asked Questions

1. What is the connection size of VNP216?

It uses a G 2-inch female threaded connection.

2. Is VNP216 a single- or double-diaphragm valve?

It is a double-diaphragm pulse jet valve.

3. Does it include a solenoid pilot?

Yes. The VNP configuration includes an integrated solenoid pilot.

4. What is its operating-pressure range?

The specified operating range is 0.5–7.5 bar.

5. What is the flow coefficient?

The VNP216 has a Kv value of 78 and a Cv value of 90.7.

6. What is the difference between VNP216 and VEM216?

Both use a 2-inch connection and double diaphragms. VNP216 includes an integrated solenoid pilot, while VEM216 uses remote pneumatic control.

7. What coil voltage does VNP216 use?

The voltage is determined by the complete order-code suffix. Selected AC and DC coil versions are available, so the existing coil label must be checked.

8. Is the valve suitable for lubricated compressed air?

The specified operating medium is filtered, oil-free compressed air.

9. Which diaphragm material is standard?

The standard diaphragm is NBR. Optional high-temperature material may be available for correctly specified versions.

10. Can VNP214 directly replace VNP216?

No. VNP214 has a smaller 1½-inch port and a lower Kv 44 flow coefficient.

11. What repair kit is used for the standard VNP216 diaphragm assembly?

The standard main-and-secondary diaphragm repair assembly is KIT DB 116/C. Confirm the diaphragm material before ordering.