🔥 Triple-Eccentric Extended-Stroke Butterfly Valve

38 years of valve manufacturing experience | Specializing in water treatment valves | Suitable for large-diameter, deeply buried, and special‑condition pipelines

Some butterfly valves on pipelines are far from as simple as “a standard butterfly valve with an extended stem.”

When the valve is installed at a deep location, the piping requires thermal insulation, or site space constraints prevent the actuator from being mounted directly adjacent to the valve body, Extended-rod butterfly valve It thus becomes a more suitable solution.

As for operating conditions involving high temperature, high pressure, frequent cycling, and stringent requirements for sealing life, Triple-eccentric structure + extended rod design It can further enhance the valve’s versatility and ease of on-site operation.

⚙️ 1. Triple-eccentric design, effectively reducing sealing friction.

The core advantage of a triple-eccentric butterfly valve lies in its ability to achieve nearly frictionless opening and closing throughout the valve disc’s travel.

The valve disc rapidly disengages from the sealing surface upon opening:

✔ Reduces friction on the sealing surface
✔ Reduces opening and closing torque
✔ Reduces seal wear
✔ Enhances the stability of repeated opening and closing operations
✔ Extends valve service life

Especially suitable for… Sealing reliability and service life High‑requirement engineering projects.

🔧 Why do many high‑demand projects choose triple‑eccentric designs?

This is because, for conventional butterfly valves, prolonged friction on the sealing surfaces can easily lead to wear.

Meanwhile, the triple-eccentric design, with its unique geometric configuration, enables the valve disc to swiftly disengage from the sealing surface during the opening process.

It features low friction when opening and reliable sealing when closing.

📏 II. Extended rod design addresses the issue of “inaccessible valves”

When the valve is installed in the following locations:

⬇️ Deep-buried pipeline
⬇️ Underground Utility Tunnel
⬇️ Insulated piping
⬇️ High-Temperature Piping
⬇️ Locations with limited operating space
⬇️ The deeper section of the valve chamber

A standard-length valve stem may not meet the requirements of field operations.

At this point, you can Extended rod design Extend the operating position to a more convenient location.

👉 Where the valve is installed does not necessarily determine where it is operated.

The valve stem length can be designed to suit the on-site installation height and available operating space.

🔥 III. Suitable for High-Temperature and Special Operating Conditions

The triple-eccentric butterfly valve employs a metal-seated design, offering excellent resistance to high temperatures and harsh operating conditions.

Applicable to:

🔥 High-temperature medium
🔥 Steam System
🔥 Hot Water System
🔥 Heat transfer oil
🔥 Industrial Media
🔥 Flue Gas System
🔥 Special Industrial Piping

Meanwhile, the appropriate option can also be selected based on the specific operating conditions:

Valve body material, valve disc material, valve stem material, sealing materials, and surface treatment options.

📌 The specific temperature range and material configuration must be determined based on the actual operating conditions, including the process fluid, temperature, pressure, and other relevant factors.

🛡️ IV. Metal hard-sealed design for enhanced reliability over long-term operation

Unlike conventional soft-sealed butterfly valves, triple-eccentric butterfly valves typically employ Metallic hard-sealed structure 。

Its features include:

✔ High-temperature resistant
✔ Wear-resistant
✔ Long sealing life
✔ Suitable for more demanding operating conditions
✔ Suitable for applications involving frequent opening and closing

For certain high-temperature or special-media systems where soft-seal materials are limited by temperature, a triple-eccentric metal‑sealed butterfly valve offers an alternative solution.

🔩 5. The extension rod length can be customized to meet on-site requirements.

Not all projects have the same “extension rod” length.

We can configure it based on the on-site installation conditions.

For example:

📐 Distance from the valve body center to the operating position
📐 Pipe burial depth
📐 Insulation layer thickness
📐 Valve well depth
📐 Actuator mounting height
📐 On-site operating space

Determine the appropriate extension rod length based on the actual dimensions.

📌 If you already have the on-site installation dimensions, simply send us the drawings.

We can confirm the extended rod solution based on the drawings.

⚡ VI. Multiple drive options available

According to the on-site control requirements, the following can be configured:

🔘 Manual
🔘 Worm gear and worm shaft
🔘 Electric
🔘 Pneumatic
🔘 Hydraulic

For projects that require remote control, you can also configure the corresponding:

✔ On-off actuator
✔ Regulating actuator
✔ Limit switch
✔ Position signal feedback
✔ Control Accessories

Enable the valve to be integrated with the field automation control system.

🏗️ VII. Also suitable for large-diameter pipelines

The triple-eccentric extended‑stem butterfly valve is particularly well suited for large‑diameter pipelines and applications where space is limited.

Common applications include:

💧 Municipal Water Supply and Drainage
💧 Water Treatment
💧 Industrial Water Systems
💧 Heating Pipeline Network
💧 Steam System
💧 Recirculating Water System
💧 Pumping Station
💧 Underground Utility Tunnel
💧 Large-diameter transmission pipeline

If your valve is installed in a particularly unusual location, Don’t rush to set the standard length.

Please send us the on-site dimensions, and we’ll first determine whether an extension pole is needed and, if so, how long it should be.

📐 VIII. Common Product Specifications

📌 Specific specifications regarding caliber, pressure, materials, temperature, stem length, and actuator configuration shall be determined based on the project’s operating conditions.

🏆 9. 38 years of valve manufacturing experience, specializing in water treatment.

Zhengzhou Zhongnan Valves originated in… 1988 。

For the past 38 years, we have remained committed to valve manufacturing and have long served:

💧 Water Treatment Engineering
💧 Municipal Water Supply and Drainage
💧 Industrial Water Systems
💧 Pumping Station
💧 Water Conservancy Project
💧 Large-diameter pipeline system

The main products include:

🔹 Double-eccentric butterfly valve
🔹 Triple-eccentric butterfly valve
🔹 Extended-Handle Butterfly Valve
🔹 Seawater butterfly valve
🔹 Eccentric Hemisphere Valve
🔹 Rotary ball valve
🔹 Flow and pressure regulating valve
🔹 Hydraulic Check Valve

We are concerned not only with whether “the valve can be manufactured,” but rather:

What kind of structure is actually suitable for your operating conditions?

💬 10. Need an extension rod? Don’t rush to decide on the length just yet.

If you are sourcing triple-eccentric extended-stem butterfly valves, please feel free to send us the following information:

📌 Caliber: DN?
📌 Pressure: PN / Class?
📌 Medium: What medium?
📌 Temperature: How many °C?
📌 Installation method: aboveground / underground / in a utility tunnel?
📌 Extension rod length: Are there any requirements?
📌 Actuation method: manual / electric / pneumatic?
📌 Quantity: How many units?

📩 It’s okay even if the parameters aren’t complete.

You can just send it directly:

① Project Drawings
② Valve List
③ Technical Specification Document
④ On-site photos

We’ll help you confirm it together.

🔥 Triple eccentricity—more than just for “high temperatures”

📏 Extension rods aren’t just for “extending”

What really matters is:

Select the appropriate valve design based on your installation environment and operating conditions.

38 years of valve manufacturing experience · Focused on water treatment

👉 Please send us your bore size, pressure rating, and on-site installation dimensions, and we’ll help you confirm the solution first.