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Double Offset Disc Butterfly Valve Series 300HD/310HD
Nil-Cor® Double-Offset Disc Butterfly Valve (3”-12” Series 300HD/310HD) is a double-offset wafer style full-face body or threaded lug body, high performance composite butterfly valve for corrosive chemical service used in construction of pressurized piping systems.

Product Features & Benefits
- COMPOSITE ADVANTAGE: Nil-Cor® uses premium epoxy novolac vinyl ester resin and a special blend of fillers, reinforcement and curing agents to produce an inherently corrosion resistant valve. Without the need for expensive liners that eventually swell or permeate, Nil-Cor® butterfly valves deliver a long, maintenance-free service life.
- DOUBLE-OFFSET DISC DESIGN: allows the disc to move off the seat with a “camming” action, reducing break-away torque and seat wear.
- 360° UNINTERRUPTED DISC SEAL: eliminates the leak path at the shaft hubs found on PTFE and rubber-lined valves.
- STAINLESS-STEEL SHAFT: the stainless-steel shaft encapsulated with graphite or fiberglass-reinforced vinyl ester resin eliminates corrosion and assures long trouble-free operation.
- CHEMICAL RESISTANCE TO CORROSIVE SOLUTIONS: the novolac epoxy resin and graphic fiber combination valve provides outstanding resistance to solvents organic acids, caustics and salt solutions in higher temperature applications.
- DURABLE AND LIGHT WEIGHT: Nil-Cor® butterfly valves weigh less than 1/3 that of similarly sized metal valves. This means reduced handling and shipping expenses and easier installation.
- VALVE TYPES AVAILABLE:
- 300 HD Series Full-Face (Graphite Reinforced Vinyl Ester)
- 300 HD Series Lug (Graphite Reinforced Vinyl Ester)
- 310 HD Full-Face (Fiberglass Reinforced Vinyl Ester)
- 310 HD Lug (Fiberglass Reinforced Vinyl Ester)
Technical Details
FULL-FACE BUTTERFLY VALVE: 3” – 12” Series 300HD/ LUG BUTTERFLY VALVE: 3” – 12” Series 300HD
Materials of Construction
- Body: Graphite Fiber-Reinforced Vinyl Ester
- Retainer Ring: Graphite Fiber-reinforced vinyl ester resin
- Seat: Viton GF or PTFE
- Disc: Vinyl ester resin reinforced with graphite fiber (3”-8”) or glass fiber (10”, 12”)
- Shaft: 17-4 PH stainless steel encapsulated with graphite fiber-reinforced vinyl ester on all wetted surfaces
- Shaft Retainer Pin: Graphite-filled PVDF
- Packing Follower: Hastelloy-C
- Packing Bolts: Hastelloy-C
- Shaft Seals: PTFE-V-Ring Packing
FULL-FACE BUTTERFLY VALVE: 3” – 12” Series 310HD/ LUG BUTTERFLY VALVE: 3” – 12” Series 310HD
Materials of Construction
- Body: Glass Fiber-reinforced vinyl ester resin
- Retainer Ring: Glass Fiber-reinforced vinyl ester resin
- Seat: Viton GF or PTFE
- Disc: Vinyl ester resin reinforced with graphite fiber (3”-8”) or glass fiber (10”, 12”)
- Shaft: 17-4 PH stainless steel encapsulated with graphite fiber-reinforced vinyl ester on all wetted surfaces
- Shaft Retainer Pin: Graphite-filled PVDF
- Packing Follower: Hastelloy-C
- Packing Bolts: Hastelloy-C
- Shaft Seals: PTFE-V-Ring Packing
Size Range
- • 3” – 12”
Flange Compatibility
- ANSI CL150 AND CL125
- DIN and JIS on application
Service Temperature
- Continuous temperature service from 0° to 250° F. Short term exposures to 300° F are acceptable.
Pressure Rating

Body Type
- Full faced Wafer
- Threaded Lug
Applications
- Oil Refinery
- Power Industry
- Paper and Pulp
- Chemical
- Mining
- Water and Wastewater
- Hydrogen
- Natural Gas Distribution
- Lithium
- Steel Processing
Literature
Technical Specifications
- Full-Face Butterfly Valve: 3” – 12” Series 300HD
- Lug Butterfly Valve: 3”-12” Series 300HD
- Full-Face Butterfly Valve: 3” – 12” Series 310HD
- Lug Butterfly Valve: 3”-12” Series 310HD
- Installation, Maintenance and Operating Instructions 3”-12” Series 300HD, 310HD Full Face & Lug
- Control Valve Specifications 300HD/310HD
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