Grooved/Wafer Butterfly Valve with Integrated Supervisory Tamper Switch A high-performance, quarter-turn fluid isolation valve engineered explicitly for active fire protection grids. Available in grooved or wafer connection styles, this resilient-seated valve features a low-torque gearbox operator, a fusion-bonded epoxy-coated ductile iron body, and a pre-wired internal supervisory tamper switch to prevent unauthorized system closure and ensure unhindered water flow to critical sprinkler grids.
Code-Compliant Isolation for Main Sprinkler and Standpipe Riser Systems
In high-density commercial towers and industrial facilities, fire suppression systems must be kept continuously open and ready to deliver massive water volume at a moment's notice. Because a closed valve can cause a catastrophic failure of the entire life-safety network, fire codes demand that isolation valves on main feed lines be physically supervised. The Fire Protection Butterfly Valve is the modern industry standard for this application, replacing bulky gate valves with a compact, lightweight, and high-security isolation solution.
Operating on a quarter-turn mechanism ($90^{\circ}$ rotation), the valve utilizes a central disc that rotates on a heavy-duty stainless steel shaft. When turned open, the disc aligns parallel to the water stream, maximizing fluid dynamics and minimizing pressure drops. The valve is driven by a slow-closing, handwheel-operated worm gearbox. This slow mechanical action is a critical safety feature: it prevents field technicians from slamming the valve shut too quickly, which would generate destructive hydraulic shock (water hammer) capable of rupturing overhead pipe fittings or tripping pressure switches.
The Critical Role of the Supervisory Tamper Switch
Per NFPA 13 and NFPA 24 compliance regulations, any valve controlling the water supply to a fire sprinkler network must be electronically monitored. Our fire-fighting butterfly valves feature a dual-switch Supervisory Tamper Module integrated directly inside the weatherproof gearbox housing.
Dual-Signal Protection: Features two sets of internal SPDT (Single Pole Double Throw) micro-switches. One switch interfaces with the main Fire Alarm Control Panel (FACP) to trigger a supervisory trouble signal if the valve is turned even a fraction out of the fully open position. The second switch is reserved for localized auxiliary alarm systems or security loops.
Weatherproof Enclosure: The electrical components are sealed inside an IP65/NEMA 4X rated housing, shielding the switches from mechanical room water spray, humidity, and dust accumulation.
Key Performance Features
Resilient-Seated EPDM Disc Wrap: The ductile iron disc is entirely encapsulated in a high-durability, vulcanized EPDM rubber compound, creating a bubble-tight compression seal against the smooth internal body wall when closed.
Rapid-Install Grooved Ends: Available with precision-machined grooved end joints (compliant with AWWA C606), allowing split-second mechanical coupling installation without the weight, alignment struggles, and bolt welding required by traditional flanges.
Anti-Corrosive Fusion-Bonded Epoxy (FBE): The valve body is fully coated inside and out with an electrostatically applied, non-toxic fusion-bonded epoxy finish, shielding the metallurgy from oxidation and mineral scale buildup over long standing periods.
Low-Profile, Compact Footprint: Weighs significantly less and requires a fraction of the structural installation space compared to an equivalent Outside Screw & Yoke (OS&Y) gate valve, minimizing pipe hangar strain.
Strict Fire Certifications: Fully engineered, tested, and validated to bear official UL Listing and FM Approval marks for maximum insurance and fire marshal compliance.
Ideal Infrastructure Applications
Fire Sprinkler Riser Manifolds: Serving as the primary sectional control valve isolating individual floor networks or specific building zones.
Fire Pump Discharge Mains: Positioned directly on the downstream output manifold of electric or diesel fire pumps to isolate the pump house from the rest of the facility during maintenance.
Deluge and Pre-Action Control Systems: Functioning as the reliable master supply valve for high-hazard chemical storage rooms or data center pre-action systems.
Technical Performance MatrixEngineering MetricGrooved Butterfly Valve ProfileWafer Butterfly Valve ProfileNominal Diameter RangeDN50 ($2"$) up to DN300 ($12"$) standardDN50 ($2"$) up to DN300 ($12"$) standardEnd Connection StyleGrooved Ends (AWWA C606 / ISO 6182)Wafer Type (Sandwiches between PN16/Class 150 flanges)Maximum Working Pressure12.0 bar to 20.7 bar (175 PSI to 300 PSI)12.0 bar to 20.7 bar (175 PSI to 300 PSI)Factory Shell Test PressureHydrostatic testing validated up to 2.0$\times$ WorkingHydrostatic testing validated up to 2.0$\times$ WorkingTamper Switch WiringDual SPDT Switches (Form C), 10A @ 125/250V ACDual SPDT Switches (Form C), 10A @ 125/250V ACBody Shell MetallurgyDuctile Iron (ASTM A536 Grade 65-45-12)Ductile Iron (ASTM A536 Grade 65-45-12)Shaft / Stem ConfigurationTwo-Piece Stub Shaft, Stainless Steel (Grade 416/304)Two-Piece Stub Shaft, Stainless Steel (Grade 416/304)Standard Procurement Package Components
Complete Fire Protection Butterfly Valve Assembly with Integrated Worm Gearbox
Factory Pre-wired Internal Dual-Switch Supervisory Tamper Module with Flying Leads
Cast Iron Handwheel Drive Operator with Visual Open/Closed Position Indicator Flag
Technical Pressure Alignment, UL/FM Certification, and Field Wiring Schematic Sheets
Optional System Add-ons: Mechanical Grooved Pipe Couplings, Flange Bolt/Gasket Core Kits, and External Locking Cable Seals (Sold Separately)