Butterfly Buffer Check Valve with Hydraulic Damping Cylinder

Supplied directly by China manufacturer Dafugui, the Butterfly Buffer Check Valve with Hydraulic Damping Cylinder provides reliable backflow control for heavy-duty municipal and industrial pipelines. Operating seamlessly across DN50–DN1400 sizes, it utilizes dual-stage hydraulic buffering to manage pressure surges without compromising system efficiency.

Manufactured with ductile iron, cast steel, or stainless steel body options, the valve is suitable for water transmission pipelines, sewage systems, cooling water circulation networks, and industrial fluid applications. Dafugui provides customized hydraulic adjustment based on pipeline pressure, pump characteristics, and operating requirements.

Operating Principle of Hydraulic Buffer Control

Two-Stage Closing Design

When the Butterfly Buffer Check Valve with Hydraulic Damping Cylinder stops or flow direction changes, the valve disc begins closing automatically under reverse flow force.

During the first stage, approximately 70–80% of the disc travel is completed quickly to prevent excessive reverse flow.

During the second stage, the external hydraulic damping cylinder controls the final closing movement, allowing the disc to approach the valve seat gradually.

Hydraulic Cylinder Damping Mechanism

The hydraulic cylinder works through controlled oil displacement. As the valve shaft rotates toward the closing position, the piston movement forces hydraulic oil through an adjustable throttling channel.

This creates adjustable resistance, slowing the final closing speed and helping reduce pressure fluctuations inside the pipeline system.

Water Hammer Reduction Performance

By controlling the final closing phase, the hydraulic damping mechanism helps minimize sudden flow interruption and reduces the risk of damaging pressure surges in long-distance pipelines.

Design Standards and Compliance

Key Features

Adjustable Hydraulic Closing Control

The side-mounted hydraulic cylinder allows engineers to adjust the closing speed according to pipeline length, pump shutdown characteristics, and operating pressure.

This makes the valve suitable for different water supply networks and industrial fluid systems requiring customized closing performance.

Non-Slam Backflow Protection

The controlled closing mechanism reduces sudden disc impact against the valve seat, helping extend service life and maintain stable pipeline operation.

Heavy-Duty Butterfly Valve Structure

The butterfly disc design provides compact dimensions, lower installation space requirements, and reliable operation in large-diameter pipeline systems.

Multiple Material Options

Dafugui supplies different body and internal component materials according to application conditions:

• Ductile Iron GGG40/GGG50 for general water applications
• Cast Steel WCB for higher pressure industrial systems
• Stainless Steel CF8/CF8M for corrosive media environments

Quality Control and Testing

Every Dafugui Butterfly Buffer Check Valve undergoes inspection procedures before shipment:

Hydrostatic Shell Test

Valve bodies are tested under hydraulic pressure according to API 598 requirements to verify structural strength and pressure resistance.

Seat Leakage Test

Bi-directional sealing tests are performed to confirm valve tightness and prevent unwanted backflow.

Dimensional Inspection

Critical components including valve shafts, disc sealing surfaces, and flange dimensions are inspected using precision measuring equipment.

Coating Inspection

Internal and external epoxy coating thickness is measured to ensure corrosion protection performance.

Industrial Applications

Municipal Water Supply Systems

Installed after pump stations and along transmission pipelines, the valve helps control reverse flow and reduce pressure fluctuations during pump shutdown.

Sewage Treatment and Transfer Pipelines

Suitable for wastewater systems where reliable backflow prevention and corrosion-resistant protection are required.

Power Plant Cooling Water Systems

Used in cooling water circulation pipelines to protect pumps and maintain stable flow direction.

Industrial Process Pipelines

Applicable for industrial water, treated wastewater, and other non-aggressive liquid systems requiring controlled valve closure.

Dafugui Manufacturing Advantages

Precision Machining Capability

Dafugui uses CNC machining equipment to process valve bodies, shafts, discs, and sealing components, maintaining dimensional accuracy and assembly consistency.

Customized Hydraulic Adjustment

The hydraulic cylinder parameters can be configured according to:

• Pipeline length
• Pump capacity
• Static pressure
• Flow velocity
• Required closing time

Integrated Manufacturing and Quality Control

Valve casting, machining, assembly inspection, pressure testing, and coating inspection are controlled through an integrated manufacturing process.

Technical Specifications

Frequently Asked Questions

How does a hydraulic damping cylinder improve a butterfly check valve?

A Butterfly Buffer Check Valve with Hydraulic Damping Cylinder controls the final closing speed of the valve disc. Compared with conventional mechanical closing methods, it provides adjustable resistance during the final stroke, helping reduce sudden pressure changes caused by rapid valve closure.

Can the hydraulic closing speed be adjusted after installation?

Yes. The hydraulic system can be equipped with adjustable throttling components, allowing maintenance personnel to modify closing characteristics according to actual pipeline operating conditions.

What materials are available for corrosive applications?

Dafugui offers stainless steel CF8/CF8M components and corrosion-resistant coating options for applications involving wastewater, industrial fluids, or environments requiring enhanced corrosion protection.

What inspection documents are available for export orders?

Dafugui can provide inspection records, pressure test reports, material documentation, and third-party inspection support according to customer project requirements.