Mecair VNP220 2.5 Inch Double Diaphragm Pulse Jet Valve Kv 96

The Mecair VNP220 is a high-flow pulse jet diaphragm valve designed for reverse-pulse filter cleaning in large dust collectors and baghouse systems.

Its main distinguishing features are the G 2.5-inch female threaded connection, double-diaphragm construction, integrated solenoid pilot and Kv 96 flow coefficient. These characteristics make it suitable for cleaning systems that require a larger compressed-air pulse than smaller 1.5-inch or 2-inch valve configurations.

The inlet is positioned at 90 degrees to the outlet, allowing the valve to connect between a compressed-air header and the corresponding blowtube. The right-angle arrangement supports straightforward installation in conventional baghouse and cartridge-filter cleaning systems.

The valve operates with filtered, oil-free compressed air over a pressure range of 0.6–7.5 bar. Its double-diaphragm mechanism supports rapid opening and closing, allowing stored compressed air to be released as a concentrated cleaning pulse.

An anodized die-cast aluminum body provides environmental and corrosion protection. Stainless-steel fasteners, pilot components, diaphragm backing discs and springs are used in the valve assembly.

Key Differentiating Features

• G 2.5-inch female threaded connection
• Double-diaphragm valve mechanism
• Integrated electrical solenoid pilot
• High-flow Kv 96 and Cv 112 rating
• 0.6–7.5 bar operating-pressure range
• 90-degree inlet-to-outlet geometry
• Designed for reverse pulse-jet filter cleaning
• Anodized die-cast aluminum body
• Stainless-steel internal hardware
• Standard NBR diaphragm
• Optional high-temperature diaphragm material
• Class H solenoid-coil insulation
• IP65 DIN electrical connector
• Multiple AC and DC coil options
• Approximately 3.3 kg weight

High-Flow 2.5-Inch Configuration

The VNP220 has the largest threaded connection and highest flow coefficient among the VNP206–VNP220 models listed in the standard threaded-valve range.

Its Kv value of 96 is higher than the Kv 78 rating of the 2-inch VNP216. This additional flow capacity can be useful in dust collectors with larger blowtubes, greater header volume or more filter elements assigned to each cleaning pulse.

A larger valve does not automatically guarantee better filter cleaning. Header pressure, compressed-air volume, pulse duration, nozzle design, blowtube dimensions and filter spacing must all be correctly matched.

The minimum specified operating pressure is 0.6 bar, compared with 0.5 bar for most smaller models in the range.

Double-Diaphragm Operation

The VNP220 uses a main diaphragm and a secondary diaphragm. This construction is used to control the larger airflow associated with its 2.5-inch port.

The coordinated diaphragm movement supports rapid valve opening and closing. A short, concentrated air pulse helps remove accumulated dust from filter bags, cartridges and other filter elements while limiting unnecessary compressed-air discharge.

Both diaphragms, the spring and their associated sealing surfaces must be inspected during maintenance. Replacing only one damaged diaphragm may not restore correct valve operation.

Integrated Solenoid Pilot

The VNP configuration includes a solenoid pilot mounted directly on the valve. It accepts an electrical pulse from a compatible dust-collector controller and initiates the diaphragm opening sequence.

This design eliminates the need for a separate remote pneumatic pilot enclosure beside the valve.

The basic model number does not identify the coil voltage. The complete order code must specify the required voltage and frequency, such as an appropriate DC or 50/60 Hz AC coil version.

Always compare the complete coil label before ordering a replacement.

Model Comparison

The VNP220 differs from the VNP216 through its larger connection, higher flow coefficient, higher minimum pressure and greater body weight.

The corresponding VEM220 has the same 2.5-inch connection and flow coefficient but uses a remote pneumatic pilot instead of an integrated solenoid pilot.

Typical Applications

• Large baghouse dust collectors
• Cartridge-filter cleaning systems
• Cement plant dust extraction
• Mining and mineral processing
• Silo ventilation systems
• Bulk-material transfer points
• Conveyor dust-control systems
• Power plant filtration
• Foundry dust collection
• Metal-processing ventilation
• Ceramic filter cleaning
• Industrial powder-processing equipment
• Replacement of an existing VNP220 valve

Installation and Selection Notes

The VNP220 is a pneumatic pulse-cleaning valve and is not intended for hydraulic-pump circuits or liquid service.

Use filtered, oil-free compressed air within the specified 0.6–7.5 bar pressure range.

Confirm that the pipework uses a compatible G 2.5-inch female threaded connection. Do not assume that NPT or another thread standard is interchangeable.

Because of the valve’s 3.3 kg weight and larger pipe connection, support the header and blowtube correctly. Do not use the valve body to compensate for misaligned piping.

The valve can be installed in permitted orientations but should not be mounted upside down. Position the solenoid to reduce the risk of dirt or moisture entering the pilot assembly.

Verify the complete coil voltage and frequency suffix before wiring. The IP65 protection rating applies when the correct DIN connector, seal and cable entry are properly assembled.

For standard double-diaphragm maintenance, the corresponding main-and-secondary diaphragm assembly is KIT DB 120/C. KIT DB 120V is used for the appropriate Viton configuration.

Frequently Asked Questions

1. What is the port size of VNP220?

It uses a G 2.5-inch female threaded connection.

2. Is VNP220 a hydraulic valve?

No. It is a pneumatic pulse jet valve for dust-collector filter-cleaning systems.

3. How many diaphragms does it contain?

The VNP220 uses two diaphragms.

4. What is its operating-pressure range?

The specified operating range is 0.6–7.5 bar.

5. What are the flow coefficients?

The valve is rated at Kv 96 and Cv 112.

6. Does it include a solenoid pilot?

Yes. The VNP configuration includes an integrated solenoid pilot.

7. What is the difference between VNP220 and VNP216?

VNP220 has a 2.5-inch port and Kv 96 flow coefficient. VNP216 has a 2-inch port and Kv 78 flow coefficient.

8. What is the difference between VNP220 and VEM220?

VNP220 includes an integrated electrical solenoid pilot. VEM220 requires remote pneumatic pilot control.

9. Which coil voltage is supplied?

The coil voltage is determined by the complete order-code suffix. The valve label must be checked before ordering.

10. What compressed-air quality is required?

Use filtered, oil-free compressed air.

11. Which standard diaphragm repair kit is used?

The standard double-diaphragm assembly is KIT DB 120/C. Confirm the diaphragm material and valve version before ordering.

12. Can VNP216 directly replace VNP220?

No. The port size, flow coefficient, minimum operating pressure, pipework and cleaning-system airflow requirements are different.