The Watts DBF-03-121-2G-M2 is a 8" full-lug butterfly valve with an aluminum bronze disc, operated by a gear operator. It features a ductile iron body and a buna-n seat. Rated to 200 psi and 14°F to 176°F.
This 8" domestic full lug style butterfly valve, model DBF-03-121-2G-M2, is used in HVAC, irrigation, OEM, commercial, and institutional applications and wherever positive shutoff is required to control the flow of liquids, gases, and slurries. It features cast iron body construction, aluminum bronze disc, Buna-N seat, a stainless steel shaft, mounting pad for gear operator.
Features
- Gear operator
- Ductile iron body
- Aluminum bronze disc
- Buna-N seat
- Includes: Gear Operator
Common Questions
- Can I use this valve at the end of a line or for dead-end service?
- Yes. This is a full-lug body, so it is rated for bidirectional dead-end service to the full pressure rating (200 psi). The threaded lugs let you unbolt and remove downstream piping while the valve holds pressure, so it can terminate a line or isolate equipment for service.
- What temperature range does this valve handle?
- 14°F to 176°F. On a resilient-seated butterfly valve the temperature limit is set by the seat elastomer, and this valve uses a Buna-N seat. If you need a wider range, the same body is offered with other seat compounds: Buna-N (14°F to 176°F), EPDM (5°F to 248°F), or Viton (-4°F to 302°F).
- Can I mount an actuator on this valve?
- Yes. The valve has an integral ISO 5211 mounting pad, so it accepts electric or pneumatic actuators without an adapter kit. This model ships with a gear operator, which can be removed and replaced with an actuator later.
- Is this valve approved for potable water?
- Yes. It is NSF/ANSI 61-G listed for potable-water service, and also meets MSS SP-67 and API 609 for face-to-face dimensions and construction.
- Will this bolt up to my existing flanges?
- Yes, on ANSI 125/150 flanges — this valve is dimensioned to API 609 and MSS SP-67 and mates to ANSI Class 125 and Class 150 flanges in 8" pipe. Use the correct lug/wafer bolting for your body style and check that the disc has room to swing clear of the mating pipe ID.
- Why does this model use a gear operator instead of a lever?
- At 8" the torque needed to unseat the disc is more than a hand lever can comfortably deliver, so this model ships with an enclosed gear operator and handwheel. The gearing also lets you throttle precisely and holds the disc position against flow, rather than relying on a detent plate.
Specifications
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Type: Butterfly
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Size: 8"
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Connection: Lug
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Body Material: Ductile Iron
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Seat / Seal Material: Buna-N
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Max Pressure (psi): 200
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Application: Domestic Water
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Operation: Manual
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: DBF-03-121-2G-M2 8
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Temperature: 14°F to 176°F
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Certifications: NSF 61-G, MSS SP-67, API 609
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Disc Material: Aluminum Bronze
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Stem Material: 416 Stainless Steel
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Operator Type: Gear Operator
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Dead-End (End-of-Line) Service: Yes
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Flange Class: ANSI 125/150
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Actuator Mounting Pad: ISO 5211
