Butterfly Valve With Bypass
for High Differential Pressure Pipelines
Ensure Safe Valve Opening, Maintain Minimum Flow, and Protect System Operation — Even During Power Failure
Maintain Minimum Flow
Prevent water stagnation and ensure water quality through continuous bypass circulation
Safe Manual Operation
Equalize pressure across the disc for safe manual override when power is unavailable
Large Diameter Ready
Designed for DN500–DN1800 pipelines where high differential pressure demands bypass protection
Engineered with an integrated bypass line, this butterfly valve enables pressure equalization before main valve operation — preventing water hammer, reducing actuator torque, and ensuring safe manual override when power is unavailable.
Explore the Complete Bypass Butterfly Valve Solution
Application Scenarios for Butterfly Valves With Bypass
Designed for large-diameter pipelines and systems where high pressure differential makes valve operation difficult or unsafe.
Water Transmission & Distribution
High pressure difference across valves in long-distance pipelines
Maintains minimum flow to prevent water stagnation and ensures water quality, while enabling safe valve opening under high differential pressure.
Pump Discharge Systems
Sudden pressure buildup after pump shutdown or restart
Gradually equalizes pressure before opening the main valve, reducing actuator load and preventing mechanical damage to the system.
Hydropower Plants
Extremely high pressure differential in penstock systems
Ensures controlled pressure balancing and avoids dangerous water hammer during valve operation in high-head penstock pipelines.
Cooling Water Circulation
Continuous flow systems requiring stable operation and periodic valve control
Maintains minimum flow and prevents system interruption or pressure shock during routine valve cycling in closed-loop cooling circuits.
Oil & Gas Pipelines
High-pressure pipelines with strict operational safety requirements
Provides safe pressure equalization and reduces risk during valve opening, especially in critical operations where uncontrolled flow could cause hazardous conditions.
Not Sure If You Need a Bypass?
Our engineers can evaluate your working conditions and recommend the right bypass configuration for your system.
Talk to an EngineerChallenges of Operating Butterfly Valves Without a Bypass
In high differential pressure systems, operating a butterfly valve directly can lead to serious operational risks, equipment damage, and safety concerns.
| Operating Condition | Without Bypass | With Bypass |
|---|---|---|
| Opening Torque | High opening torque required due to full pressure acting on disc | Reduced torque through pressure equalization before opening |
| Manual Operation | Difficult or impossible to open manually under pressure | Smooth and controlled valve opening, even by hand |
| Equipment Safety | Risk of actuator overload or mechanical failure | Extended actuator and valve service life |
| Pressure Surge | Sudden pressure surge causes water hammer | Gradual pressure balancing prevents shock |
| System Flow | Flow stagnation when valve is fully closed | Maintains minimum flow for system stability |
Need help selecting the right bypass configuration for your pipeline system?
How the Bypass System Works
A simple and effective method to equalize pressure before opening the main valve.
Open the Bypass Valve
A small bypass valve is opened first, allowing a controlled flow between upstream and downstream sides of the main valve.
Pressure Equalization
The pressure on both sides of the main butterfly valve disc gradually becomes balanced through the bypass line.
Open the Main Valve
With reduced differential pressure, the main butterfly valve can be opened safely with much lower torque — even by hand.
The bypass system allows safe, smooth, and controlled valve operation — especially in high differential pressure conditions where direct opening would be dangerous or impossible.
System Components Overview
A complete bypass butterfly valve system includes more than just the main valve — each component plays a critical role in safe operation.
Main Butterfly Valve
Primary Shut-offThe core shut-off component in the pipeline system
Available in DN500–DN1800 with PN10–PN40 ratings
Bypass Valve
Pressure ControlEnables gradual pressure equalization before main valve operation
Bypass valve type selected based on system requirements
Bypass Piping & Connections
Flow PathConnects upstream and downstream sides around the main valve
Piping configuration engineered per project specification
Actuation System
OptionalManual, electric, or pneumatic control for the valve system
Actuator sizing and selection included with quotation
Key Features of Butterfly Valve With Bypass
Engineered to ensure safe, reliable operation in high differential pressure pipeline systems.
Pressure Equalization for Safe Operation
The integrated bypass system allows gradual pressure equalization between the upstream and downstream sides of the main valve before operation. This significantly reduces the force acting on the valve disc, ensuring a smooth and controlled opening process. It is particularly critical in high differential pressure conditions where direct operation may be unsafe or impractical.
Reduced Operating Torque
By equalizing pressure before opening, the required operating torque is significantly reduced. This enables easier manual operation and allows the use of smaller, more cost-effective actuators. It also minimizes mechanical stress on the valve components, improving long-term operational reliability.
Prevention of Water Hammer
The bypass system enables gradual pressure balancing, preventing sudden fluid acceleration when the main valve is opened. This effectively reduces the risk of water hammer, which can cause pipeline vibration, equipment damage, and safety hazards in critical systems.
Maintain Minimum Flow & Water Quality
Even when the main valve is fully closed, the bypass line can maintain a controlled minimum flow within the pipeline. This helps prevent water stagnation, reduces the risk of bacterial growth, and supports consistent water quality, especially in municipal and water treatment systems.
Reliable Operation During Power Failure
In the event of power failure, the bypass system allows pressure equalization before manual operation of the main valve. This makes it possible to open the valve safely without relying on powered actuators, ensuring operational continuity and improving system safety in emergency situations.
Customizable Bypass Configuration
The bypass system can be fully customized based on project requirements, including bypass valve type, size, and piping configuration. Design considerations are based on actual working conditions such as pressure differential, flow rate, and pipeline layout, ensuring optimal performance for each application.
Technical Specifications
Complete specification overview for butterfly valve with integrated bypass system.
| Parameter | Specification |
|---|---|
| Valve Type | Butterfly Valve with Bypass |
| Design Type | Double Eccentric / Triple Offset (Optional) |
| Size Range | DN500 – DN1800 |
| Pressure Rating | PN10 / PN16 / PN25 / PN40 |
| Temperature Range | -10℃ to 200℃ (depending on material) |
| Body Material | WCB / LCB / CF8 / CF8M / Duplex Stainless Steel |
| Disc Material | WCB / CF8 / CF8M / Duplex |
| Seat Type | PTFE / EPDM / Metal Seat |
| Leakage Class | ISO 5208 Rate A / EN 12266-1 |
| Connection Type | Flanged (EN 1092-2 / ASME B16.5) |
| Face-to-Face | EN 558 Series 13 / API 609 |
| Operation Type | Manual / Gearbox / Electric / Pneumatic |
| Bypass Valve Type | Ball Valve / Globe Valve |
| Bypass Size | Customized based on pressure & flow conditions |
| Applicable Medium | Water / Seawater / Oil / Gas |
| Design Standards | EN 593 / API 609 / ASME B16.34 |
| Inspection & Testing | API 598 / EN 12266 |
| Certification | ISO 9001 / CE / API (optional) |
Specifications above represent standard configurations. All parameters can be customized to your project requirements including special materials, coatings, and non-standard dimensions.
Bypass size and configuration are designed based on actual working conditions such as pressure differential, flow rate, and pipeline layout.
Why Choose Our Bypass Butterfly Valve Solution
You need more than just a valve — you need a reliable solution that works in your actual pipeline conditions.
A Solution, Not Just a Valve
You are not simply buying a butterfly valve. You get a complete bypass solution tailored to your system, including valve selection, bypass configuration, and engineering support based on your working conditions.
Reduce Risk in High Pressure Systems
You avoid common operational risks such as excessive torque, actuator overload, and water hammer. Your system operates more safely and reliably, especially in large-diameter and high-pressure pipelines.
Engineering Support Before You Order
You receive technical support before production, including bypass sizing recommendations, torque calculation, and GA drawings. This helps you confirm the solution is correct before placing an order.
Compliance with International Standards
You get products manufactured and tested according to international standards such as API, EN, and ISO. Full documentation is available to support your project requirements and inspections.
Reliable Delivery for Project Schedules
You can rely on stable production and delivery timelines, especially for large-diameter valves and project orders, helping you stay on schedule without delays.
Ready to Discuss Your Project?
Share your pipeline conditions and our engineers will propose the right bypass solution for your system.
Talk to an EngineerCertifications & Quality Assurance
Certified manufacturing and testing to meet international project requirements.
Every Pipeline Is Different — We Engineer Your Bypass Solution
From bypass valve type and size to piping layout and actuation, every detail is designed based on your actual working conditions. Tell us your project parameters and we'll handle the rest.
Frequently Asked Questions
Get clear answers to common technical questions before selecting your bypass butterfly valve solution.
What Our Customers Say
Real feedback from engineers and project contractors using our bypass butterfly valve solutions.
"We had a serious issue opening a DN1200 butterfly valve due to high pressure difference in our transmission line. The actuator was overloaded and manual operation was almost impossible.
After using their bypass solution, the pressure could be equalized before opening, and the valve operation became much smoother. It also helped us avoid water hammer during startup."
Project Engineer
Water Treatment Project, Southeast Asia
"In our pump discharge system, we were concerned about sudden pressure surges and potential damage to the valves.
Their team recommended a bypass configuration and provided torque calculation before we placed the order. The solution worked exactly as expected, and we reduced the actuator size compared to our initial design."
Mechanical Engineer
Pump Station Project, Middle East
"We required a reliable solution for high differential pressure conditions in a hydropower project.
What we appreciated most was the technical support before production — including drawings and bypass sizing recommendations. This made our approval process much easier and reduced risk during installation."
EPC Contractor
Hydropower Project, International
Request a Technical Solution or Quote
Tell us your pipeline conditions including valve size, pressure differential, and application. Our engineering team will respond with a bypass configuration proposal and quotation within 24 hours.
Response within 24 hours with technical proposal
Free bypass sizing and torque calculation
GA drawings provided before production
Custom bypass configuration for DN500–DN1800
Send Your Inquiry
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