DFA004 Concentric Flange Butterfly Valve Hand Lever PN16
DFA004 is a concentric flanged butterfly valve with a hand lever, designed for on-off and throttling service in water, low-pressure industrial lines, and heating systems. It connects to pipe flanges using bolts and is suitable for installations where a full bore and compact design are needed. The concentric disc aligns with the pipeline centreline, reducing turbulence and wear during operation.
| Model Code | DFA004 |
|---|---|
| Product Type | Concentric Flange Butterfly Valve[Hand Lever PN16] |
| 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 | DFA004 |
| Valve Type | Concentric flanged butterfly valve with hand lever |
| Nominal Diameter | Confirmed on request |
| Connection | Flanged, bolted to pipe flanges |
| Operation | Quarter-turn, hand lever |
| Series | DFA004 flanged butterfly valve series |
What This Model Gives You
- Concentric disc design reduces fluid turbulence and wear during operation
- Flanged connection allows secure bolted attachment to existing pipe flanges
- Compact size and lightweight body save space in tight installations
- Quarter-turn operation with hand lever enables quick manual control
- Bidirectional sealing with resilient seat ensures tight shut-off in both directions
- Part of a valve programme certified to ISO 9001 and ISO 14001
Problems It Removes
- Gate valves are too long and heavy for installations with limited space between flanges
- Lack of standardised manual valves leads to inconsistent operation and spare part issues
- Non-standard flange connections require custom fittings or rework on site
- Valves with poor alignment cause premature seat wear and leakage under cycling
- Buyers need a single supplier for both small and large diameters across the same valve family
Where It Is Installed
- Isolation of branch lines in municipal water distribution networks
- Control of flow in low-pressure heating and cooling circuits in commercial buildings
- Throttling duty on process water lines in chemical and pharmaceutical plants
- Maintenance isolation in power plant auxiliary systems with flanged piping
- Installation in retrofit projects where space between flanges is limited
Buyers It Suits
- Water utility engineers sourcing DN10 to DN2600 flanged butterfly valves for distribution systems
- HVAC contractors standardising on quarter-turn valves for heating and cooling loops
- Plant maintenance teams needing reliable manual isolation valves for low-pressure lines
- EPC buyers integrating flanged butterfly valves into water and heating packages
- Valve distributors stocking a range of flanged butterfly valves from DN10 upward
How It Is Built
- Concentric disc design aligned with pipeline centreline
- Flanged connection with bolt holes matching standard flange patterns
- Resilient seat for bidirectional sealing and low operating torque
- Quarter-turn operation via hand lever for manual control
- Body and disc made from materials confirmed per order against the medium and temperature
- Part of a DFA flanged butterfly series that continues through larger nominal diameters
Material Selection
- Body, disc, stem and seat materials are confirmed per order against the buyer's medium and temperature
- Seat and disc options follow the variants offered across the DFA flanged series
- Material certificates are issued with the order when the buyer requests them
How It Is Made
- Body casting inspected and machined on in-house fine machining equipment
- Disc and stem assembled with resilient seat and set for concentric travel
- Valve tested for tightness and full quarter-turn operation before packing
- Marked, wrapped and crated for container shipment from Tianjin
- All steps carried out under the ISO 9001 quality management system
How It Is Checked
- Dimensional check of flange bolt hole 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 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
- Seat and disc variant selected for the medium and temperature on the buyer's line
- Hand 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
| DN50 wafer butterfly valve | The flanged body allows installation in systems where the pipe flanges are not removable, unlike the wafer type |
|---|---|
| Lug type butterfly valve | The lug body allows end-of-line service without a second flange; the flanged body requires flanges on both sides |
| Gate valve at DN50 | The gate valve offers a full bore but is heavier and longer; the flanged butterfly is more compact and lighter |
| Ball valve at DN50 | A ball valve provides tighter sealing at higher pressure but costs more and requires more clearance for handle sweep |
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 connecting the valve to the flanges
- Tighten the flange bolts evenly in a cross pattern to avoid misalignment
- Open the disc fully after bolting and confirm free 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 long periods
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View SpecificationPower Generation
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.
DFA004 Concentric Flange Butterfly Valve Hand Lever PN16 FAQ
What size and pressure rating is DFA004?
It is a flanged butterfly valve with a PN16 rating. The nominal diameter is confirmed on request based on your line data, as the same model is offered across multiple sizes.
Can this valve be used at the end of a pipe run?
No. A flanged butterfly valve requires pipe flanges on both sides for secure attachment. For end-of-line service, consider a lug type body instead.
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 upon request.
Can it be supplied with an actuator instead of a hand lever?
Yes. The stem accepts a hand lever, gearbox, or pneumatic or electric actuator. The valve can be assembled and tested with the actuator fitted before shipment.
Do you supply the larger diameters in the same series?
Yes. The DFA flanged butterfly 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 will reply with a quotation and a confirmed specification sheet.
Get a Price for DFA004 Concentric Flange Butterfly Valve Hand Lever PN16
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.