DF3A002 Concentric Flange Butterfly Valve Pin Type and Gearbox
DF3A002 is a concentric flanged butterfly valve with a pin-fixed disc and gearbox, designed for on-off and throttling service in medium- and low-pressure water, heating, and industrial pipelines. It connects to pipe flanges via bolted flange ends, allowing for full isolation or flow control in fixed-position systems. The pin-fixed disc ensures consistent disc alignment during repeated cycling, reducing wear and leakage risk. The integrated gearbox enables manual operation with reduced effort, suitable for larger valves or frequent use.
| Model Code | DF3A002 |
|---|---|
| Product Type | Concentric Flange Butterfly Valve[Pin type and Gearbox] |
| Category | Concentric Flanged Butterfly Valves |
| Manufacturer | Tianjin MIC Valve Co., Ltd. |
| Size and Pressure Rating | Confirmed on quotation |
| Certification | ISO 9001 and ISO 14001 certified plant |
| Model | DF3A002 |
| Valve Type | Concentric flanged butterfly valve with pin and gearbox |
| Connection | Flanged, bolted to pipe flanges |
| Operation | Quarter-turn, manual with gearbox |
| Series | DF3A002 flanged butterfly valve series |
| Nominal Diameter Range | DN10 to DN2600 mm |
| Nominal Pressure Range | 0.05 to 4.0 MPa |
What This Model Gives You
- Pin-fixed disc maintains centred position under repeated cycling, reducing wear and leakage
- Gearbox reduces operating torque, enabling manual control on larger valves or high-pressure applications
- Flanged connection allows secure bolted attachment to pipe flanges without welding
- Concentric design provides a full bore flow path with minimal pressure drop
- Quarter-turn operation with gearbox allows precise control and position confirmation
- Part of a valve programme certified to ISO 9001 and ISO 14001
Problems It Removes
- Friction-fit discs in older valves loosen over time, causing misalignment and leakage after repeated use
- High operating torque on large valves makes manual operation difficult without a gearbox
- Lack of standardised manual operation options in flanged butterfly valves limits field usability
- Inconsistent disc alignment leads to uneven wear and reduced service life
- Buyers need a single supplier who can provide both manual and actuated options across the same valve series
Where It Is Installed
- Isolation of water and heating lines in district heating plants where manual operation is required
- Throttling control in power plant auxiliary systems with medium-pressure service
- Flow regulation in chemical and pharmaceutical process lines with low to medium pressure
- Valve operation in remote or high-access locations where actuator power is not available
- Replacement of older butterfly valves in retrofit projects requiring a reliable manual option
Buyers It Suits
- Procurement engineers sourcing manual-operated butterfly valves for water and heating systems
- EPC contractors standardising on flanged butterfly valves across multiple project sites
- Plant maintenance teams needing reliable, low-maintenance valves with reduced operating effort
- Valve distributors stocking flanged butterfly valves with gearbox options for larger diameters
- Facility operators requiring a manual control solution for valves beyond actuator reach
How It Is Built
- Flanged connection with bolted flange ends for secure pipe attachment
- Pin-fixed disc to stem for consistent centring and torque transfer
- Integrated gearbox for reduced manual operating effort
- Quarter-turn operation with lever or gearbox
- Concentric disc design for full bore flow and low pressure drop
- Part of a flanged butterfly valve series covering DN10 to DN2600
Material Selection
- Body, disc, stem, and seat materials are confirmed per order based on the medium and temperature
- Seat and disc variants follow the options available in the DF3A flanged butterfly series
- Material certificates are issued with the order upon request
How It Is Made
- Body castings inspected and machined on in-house fine machining equipment
- Disc and stem machined and pinned as a matched assembly
- Seat fitted and closure member set for concentric travel
- Gearbox assembled and tested for smooth operation
- Fully assembled valve cycled and pressure tested before packing
- Marked, wrapped, and crated for container shipment from Tianjin
How It Is Checked
- Dimensional check of flange bolt pattern and face-to-face length before assembly
- Seat and shell tightness testing on the assembled valve
- Operating torque and full quarter-turn travel verified on every unit
- Testing conducted on the 10 sets of imported inspection and testing equipment
- Records maintained under the ISO 9001 quality management system
Certificates Issued With This Valve
- ISO 9001 quality management system certification
- ISO 14001 environmental management system certification
Certification statements are limited to the management system certificates the factory actually holds. Product-level approvals for your market are confirmed before order.
What Can Be Changed
- Disc and seat variant selected based on the medium and temperature on the buyer's line
- Gearbox fitted with lever or extended handle as required
- Flange drilling matched to the standard used on the buyer's pipework
- Private label marking and packing available on OEM orders
- Mixed-diameter orders combined with other valves in one container
How It Compares With the Alternatives
| Concentric flanged butterfly valve with lever only | The gearbox reduces operating torque significantly, making it easier to operate on larger valves or in high-pressure applications |
|---|---|
| Lug type butterfly valve | The flanged body allows secure bolted connection to pipe flanges; the lug body is not suitable for full line isolation |
| Flanged butterfly valve with actuator | The gearbox provides manual operation at lower cost and without power requirements, suitable for backup or low-frequency use |
| Gate valve at DN150 and above | The flanged butterfly valve is lighter, shorter, and easier to install than a gate valve, with lower operating torque and better space efficiency |
Installing and Operating This Valve
- Confirm the flange standard and bolt pattern on both pipe flanges before ordering
- Ensure the disc is fully closed before installing the valve between flanges
- Tighten the flange bolts evenly in a cross pattern to avoid misalignment
- After installation, open the disc fully and confirm smooth quarter-turn travel
- Do not use the flanged body as a pipe end closure during pressure testing
- Cycle the valve periodically on lines that remain in one position for extended periods
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Cooling water circulating water and auxiliary system isolation for power station pipework.
Heat Supply
District heating primary and secondary circuit isolation balancing and expansion.
Preventing Seat Leakage in Butterfly Valves
Where butterfly valve seats actually fail and what to change in specification or installation.
DF3A002 Concentric Flange Butterfly Valve Pin Type and Gearbox FAQ
What size and pressure rating is DF3A002?
It is a flanged butterfly valve in the DF3A002 series. The nominal diameter and pressure rating are confirmed against your line data when we quote, as the same body is offered in multiple seat and flange variants.
Can this valve be used at the end of a pipe run?
No. A flanged butterfly valve requires flanges on both sides for secure attachment. For end-of-line service, consider a lug type or a different end connection.
Which materials are used for the body, disc, and seat?
Material selection depends on the medium and temperature on your line. We confirm the combination with the quotation and issue material certificates with the order on request.
Can it be supplied with a different gearbox or lever?
Yes. The gearbox and lever can be selected based on your operating requirements, and the valve is assembled and tested with the chosen option before shipment.
Do you supply the larger diameters in the same series?
Yes. The DF3A flanged butterfly valve series continues through the larger nominal diameters, and our valve programme covers DN10 to DN2600 across all families.
What certification does the factory hold?
Tianjin MIC Valve Co., Ltd. is certified to the ISO 9001 quality management system and the ISO 14001 environmental management system.
How do I get a quotation?
Send the model, quantity, flange standard, and medium by WhatsApp or email and our sales engineers reply with a quotation and a confirmed specification sheet.
Get a Price for DF3A002 Concentric Flange Butterfly Valve Pin Type and Gearbox
Tell us the quantity, flange standard and the medium on your line. You get a quotation with a confirmed specification sheet, not a catalogue page.