Counterweight Butterfly Buffer Check Valve with Slow Closing Mechanism

The Dafugui Counterweight Butterfly Buffer Check Valve with Slow Closing Mechanism combines gravity-assisted closing force with hydraulic buffering technology to achieve stable non-slam closure without external power supply.

When pump operation stops unexpectedly, the counterweight generates initial closing torque to drive the valve disc toward the closed position. During the final closing stage, the hydraulic damping device controls the disc movement speed, reducing sudden flow interruption and helping minimize water hammer effects.

Manufactured in Dafugui's valve production facility, the valve supports ductile iron, cast steel, and stainless steel material configurations for different pipeline media and operating conditions.

Working Principle & Slow Closing Control

Gravity-Assisted Counterweight Closing

An external counterweight arm is installed on the valve shaft to provide continuous closing torque through gravitational force. Unlike electrically controlled actuators, the Counterweight Butterfly Buffer Check Valve with Slow Closing Mechanism operates automatically during power failure or emergency pump shutdown.

The counterweight position can be adjusted along the lever arm to modify closing characteristics according to pipeline pressure, flow velocity, and installation requirements.

Hydraulic Damping for Controlled Closure

During the initial closing stage, the valve disc moves rapidly under reverse flow force and counterweight action.

When the disc approaches the seating position, the hydraulic damping cylinder controls the final closing speed by regulating oil flow through the internal throttling system.

This two-stage closing process helps:

Reduce valve disc impact against the seat

Minimize pressure fluctuation

Improve sealing component service life

Reduce vibration in large pipeline systems

Dafugui Brand Advantage: Competitive Edge over Peers

• Industrial Cluster Synergy: Located in Longwan District, Wenzhou—China's Valve City—and just 3 km from Wenzhou Airport, Dafugui benefits from an unmatched local supply chain and efficient international shipping routes.

• Integrated 5,000 m² Manufacturing Facility: Housing casting machining, CNC finishing, automated welding, and pressure testing under one roof allows us to eliminate middleman markups and deliver competitive factory-direct pricing.

• Advanced Machinery Investment: Utilizing large-scale mold machining centers, high-precision CNC lathes, and automated welding lines, Dafugui maintains higher production precision and shorter lead times than regional assembly workshops.

Technical Specifications

Quality Inspection & Testing

Each Dafugui Counterweight Butterfly Buffer Check Valve with Slow Closing Mechanism undergoes inspection procedures before shipment:

Hydrostatic Pressure Test

Valve bodies are tested under hydrostatic pressure according to applicable standards to verify pressure resistance and structural integrity.

Seat Leakage Test

The sealing performance is checked under rated pressure conditions to confirm reliable shutoff performance.

Hydraulic Damping Performance Test

Closing stroke and damping characteristics are inspected to ensure smooth operation of the slow-closing mechanism.

Dimensional Inspection

Critical components including:

Valve shaft

Disc position

Flange dimensions

Counterweight linkage

are measured before final assembly.

Frequently Asked Questions

What happens if a power failure stops the main pumps unexpectedly?

The counterweight mechanism drops automatically under gravity as forward flow halts, initiating immediate closure without requiring external electricity or manual intervention.

Can the Counterweight Butterfly Buffer Check Valve with Slow Closing Mechanism be used in untreated raw water pipelines?

Yes, when outfitted with an epoxy-coated ductile iron body and stainless steel shaft, it handles raw river water and stormwater runoff containing mild suspended solids without sticking.

How do Dafugui's prices compare with European valve suppliers?

By leveraging Wenzhou's mature industrial ecosystem and integrated factory operations, Dafugui delivers CE and API compliant valve packages at significantly reduced procurement lead times and cost points.