💧 Butterfly Valve with Extension Feature

38 years of valve manufacturing experience | Specializing in water treatment | Large-diameter pipeline butterfly valves—easier to install and maintain

What is the most troublesome aspect after valve installation?

It’s not about opening or closing a valve, but rather… In the later stages, it cannot be dismantled or replaced, and there is insufficient space for maintenance. 。

In particular, at water treatment plants, pumping stations, municipal pipeline networks, and large-scale water‑treatment projects, valves are often connected to fixed pipelines on both sides.

After a standard butterfly valve is installed, disassembly may require relocating the piping or providing additional clearance for removal.

The advantage of a telescoping butterfly valve is that it incorporates a certain degree of axial expansion and contraction adjustment capability.

🔧 Adjustable length during installation
📏 Compensates for a certain amount of pipe length error
🔩 Convenient for valve installation and removal
🛠️ Facilitates subsequent maintenance and replacement
💧 Particularly suitable for large-scale water treatment pipeline systems

📏 1. Telescopic design for more flexible installation

The installation dimensions of standard butterfly valves are relatively fixed.

Meanwhile, the telescopic butterfly valve, thanks to its telescoping design, allows for adjustment of the pipeline installation length within a certain range.

During actual construction, if the following occurs:

📐 There is an error in the pipe length.
📐 The flange spacing on both sides is not exactly the same.
📐 Deviations exist in pipeline construction.
📐 Valve replacement requires adjusting the installation distance.

Telescopic structures can provide a certain degree of adjustability.

👉 No need to repeatedly adjust the piping for installation tolerances of just a few centimeters.

This is also one of the reasons why butterfly valves with a telescoping design are particularly practical on construction sites.

🔧 II. Easier Disassembly in the Later Stage

This may be the advantage of butterfly valves that customers most often overlook.

When dismantling a standard butterfly valve, if the pipelines on both sides are fixed, it is often necessary to consider:

“How do you take the valve out?”

Moreover, the butterfly valve with a telescoping design can create sufficient clearance for disassembly.

Therefore, it is particularly suitable for:

💧 Water Plant
💧 Wastewater Treatment Plant
💧 Pumping Station
💧 Municipal water supply network
💧 Underground Utility Tunnel
💧 Water Conservancy Project

🛠️ It’s convenient during installation, but even more so during maintenance.

For water treatment projects that require long-term operation, the cost of subsequent maintenance is equally important to consider.

💧 III. Providing tailored solutions for water treatment and water supply and drainage systems

The wafer butterfly valve is suitable for large-scale conventional water systems.

Common media:

🔹 Raw water
🔹 Clear water
🔹 Wastewater
🔹 Circulating water
🔹 Industrial Water Use

Common applications:

🏭 Water Treatment Plant
🏙️ Municipal Water Supply and Drainage
💧 Water Treatment Plant
♻️ Wastewater Treatment
⚙️ Industrial Circulating Water
🚰 Pumping Station
🌊 Water Conservancy Project

Especially suitable for Large-diameter pipelines and fixed piping systems requiring frequent maintenance 。

🔩 IV. Flanged connections ensure stable and reliable installation.

Butterfly valves with a telescoping design typically use flanged connections and are installed in conjunction with pipe flanges.

Having:

✔ Reliable connection
✔ Easy to install
✔ Easy to disassemble
✔ Easy to maintain
✔ Suitable for fixed piping

At the same time, the appropriate flange standard can be selected based on project requirements.

📌 If the customer already has a piping flange standard, they can send it to us directly, and we will match it according to that standard.

🛡️ 5. Reliable sealing to minimize operational leaks

For water treatment systems, valve sealing performance is of paramount importance.

Depending on the medium and operating conditions, an appropriate sealing material can be selected.

Common materials:

🔹 EPDM
🔹 NBR
🔹 PTFE
🔹 FKM (fluororubber)

Different media, temperatures, and pressures require the adoption of distinct sealing solutions.

💡 Not sure which seal to choose?

Tell us directly:

Medium + Temperature + Working Pressure

We’ll help you identify the appropriate sealing material.

⚙️ 6. Multiple drive options to meet diverse project requirements

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

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

For automated water treatment projects, additional configurations can be provided upon request:

✔ Switch control
✔ Adjustment Control
✔ Limit switch
✔ Switch position signal feedback
✔ Remote Control Accessories

From manual operation to automated control, configurations can be tailored to meet project requirements.

🏗️ VII. Particularly suitable for large-diameter pipelines

The advantages of butterfly valves with a telescoping design are even more pronounced in large-diameter piping systems.

Common application diameters:

DN200
DN300
DN500
DN800
DN1000
DN1200
DN1500
……

Larger diameters can also be designed and manufactured according to project requirements.

Especially suitable for:

💧 Large-scale water treatment plant
💧 Wastewater Treatment Plant
💧 Municipal water supply network
💧 Pumping Station
💧 Reservoir water conveyance
💧 Water Conservancy Project

📐 VIII. Common Product Specifications

📌 Specific expansion/contraction dimensions, nominal diameter, pressure rating, materials, and actuation method shall be determined in accordance with the technical requirements of the actual project.

🔧 9. How is the expansion amount determined?

This is a very important consideration when purchasing a wafer-type butterfly valve.

Greater expansion is not always better.

Needs to be combined with:

📌 Pipeline installation length
📌 Flange-to-flange spacing
📌 Pipeline construction errors
📌 Valve disassembly space
📌 On-site Installation Environment
📌 Actual valve dimensions

Comprehensively determined.

👉 If you have the on-site dimensions, we can help you confirm the appropriate expansion allowance.

If the full size is unavailable, you can also directly use:

Piping Drawings / Valve List / Technical Specifications

Send it to us.

🏆 10. Why Choose Zhongnan Valves?

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

Zhengzhou Zhongnan Valves originated in… 1988 。

For 38 years, we have been dedicated to valve manufacturing, with a focus on serving:

💧 Water Treatment
💧 Plumbing and Drainage
💧 Municipal Engineering
💧 Water Conservancy Project
💧 Pumping Station
💧 Industrial Water Systems

The main products include:

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

For 38 years, we’ve been dedicated to water treatment—going beyond valve manufacturing to truly understand the real-world operating conditions of water systems.

💬 11. Looking for a butterfly valve with a telescoping design?

No need to get hung up on the model first.

Please send us your existing materials:

📌 Caliber DN
📌 Pressure PN / Class
📌 Medium
📌 Work stress
📌 Operating temperature
📌 Flange spacing on both sides
📌 Required expansion amount
📌 Drive method
📌 Purchase Quantity

📩 It’s okay if the parameters are incomplete.

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:

✔ Product Structure
✔ Caliber and Pressure
✔ Sealing Solution
✔ Material Configuration
✔ Extension amount
✔ Drive Type
✔ Project Quotation

🔧 Installation errors?

📏 Will it need to be disassembled later?

💧 Do large-diameter water pipelines require a more convenient maintenance solution?

A butterfly valve with a telescoping design provides more installation clearance and reduces maintenance hassle.

38 years of valve manufacturing experience · Specializing in water treatment · Specializing in water supply and drainage valves

👉 Please send us your pipe diameter, pressure rating, and flange center-to-center distance, and we’ll help you select the appropriate expansion joint solution.