DF3A003 Concentric Flange Butterfly Valve Pin Type and Bare Shaft
DF3A003 is a concentric flanged butterfly valve with a pin-type disc and bare shaft, designed for on-off and throttling service in medium- and low-pressure water, heating, and industrial fluid lines. It connects via flanges to pipe ends, allowing direct bolt-up without additional flange pairs. The pin-fixed disc ensures consistent alignment during repeated cycling, reducing wear and leakage risk compared to friction-fit designs.
| Model Code | DF3A003 |
|---|---|
| Product Type | Concentric Flange Butterfly Valve[Pin type and Bare Shaft] |
| 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 | DF3A003 |
| Valve Type | Concentric flanged butterfly valve with pin type and bare shaft |
| Connection | Flanged, bolted to pipe flanges |
| Operation | Quarter-turn, lever, gearbox, or actuator |
| Series | DF3A003 concentric 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
- Flanged connection allows direct bolt-up to existing pipe flanges without extra flange pairs
- Pin-fixed disc maintains centred position under repeated cycling, reducing wear and leakage
- Bare shaft stem enables direct attachment of levers, gearboxes, or actuators
- Concentric design provides smooth flow path with minimal pressure drop in open position
- Part of a valve programme covering DN10 to DN2600 and 0.05 to 4.0 MPa, supporting project scalability
- Built under ISO 9001 and ISO 14001 certified systems for consistent quality and environmental control
Problems It Removes
- Friction-fit disc designs loosen over time, causing misalignment and leakage after repeated cycling
- Lack of standard flange connection forces extra flange purchases or welding work
- Valves with non-standard shafts complicate actuator integration and maintenance
- Small-diameter flanged valves are often treated as special-order items with long lead times
- Buyers need a single supplier who can cover both small and large flanged valves in the same series
Where It Is Installed
- Isolation of water supply lines in district heating systems where flanged connections are standard
- Throttling control in low-pressure cooling water circuits in power and industrial plants
- Zone shut-off in municipal water distribution networks using flanged pipe systems
- Process line isolation in chemical and pharmaceutical plants with flanged piping
- Retrofitting into existing flanged pipe runs where space and connection type are fixed
Buyers It Suits
- Water and heating system contractors sourcing flanged butterfly valves in project volumes
- Plant engineers specifying flanged valves for low- to medium-pressure service lines
- EPC firms standardising on flanged butterfly valves across multiple project types
- Valve distributors stocking flanged butterfly valves from DN10 upward
- Facility operators replacing older valves with a pin-type disc design for longer service life
How It Is Built
- Flanged connection to pipe ends using standard flange drilling
- Pin-fixed disc to stem for positive torque transfer and centred disc travel
- Bare shaft stem for direct lever, gearbox, or actuator mounting
- Concentric disc design for low turbulence and minimal pressure drop
- Quarter-turn operation for fast on-off and throttling control
- Part of a flanged butterfly valve series that continues through DN10 to DN2600
Material Selection
- Body, disc, stem, and seat materials are confirmed per order based on the operating medium and temperature
- Material options follow the variants available in the DF3A003 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 assembled with pin fixation as a matched unit
- Seat fitted and closure member set for concentric travel
- Valve assembled, 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 tested on the assembled valve
- Operating torque and full quarter-turn travel verified on every unit
- Testing performed 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
- Lever, gearbox, pneumatic or electric actuator fitted before shipment
- 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
| Flanged butterfly valve with half shaft | The half-shaft version reduces stem length but offers less direct torque transfer than the pin-fixed disc |
|---|---|
| Lug type butterfly valve | The lug body allows end-of-line service; the flanged version requires flanges on both sides |
| Gate valve with flanged ends | The gate valve provides full bore but is heavier, longer, and more expensive for the same duty |
| Wafer type butterfly valve | The wafer body clamps between flanges; the flanged body bolts directly to pipe flanges, allowing easier maintenance and end-of-line use |
Installing and Operating This Valve
- Confirm the flange standard and bolt pattern on both pipe flanges before ordering
- Ensure the disc is fully open before inserting the valve into the flange alignment
- Tighten flange bolts evenly in a cross pattern to avoid misalignment
- After tightening, open the disc fully and confirm free quarter-turn operation
- Do not use the flanged valve 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.
DF3A003 Concentric Flange Butterfly Valve Pin Type and Bare Shaft FAQ
What size and pressure rating is DF3A003?
It is a flanged butterfly valve in the DF3A003 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 connection. For end-of-line service, consider a lug type or a different body style.
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 during the quotation and issue material certificates with the order on request.
Can it be supplied with an actuator instead of a lever?
Yes. The bare shaft stem accepts a lever, gearbox, or pneumatic or electric actuator. The valve is assembled and tested with the actuator fitted before shipment.
Do you supply the larger diameters in the same series?
Yes. The DF3A003 flanged butterfly valve series continues through the larger nominal diameters, and our 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 DF3A003 Concentric Flange Butterfly Valve Pin Type and Bare Shaft
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.