Commercial Pool and Spa Supplies
12" FVDP-XWB Double Arm Float Valve with Pivot &Extra Weighted Ball - Inline
12" FVDP-XWB Double Arm Float Valve with Pivot &Extra Weighted Ball - Inline
SKU:12FVDP-XMB
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The 12" FVDP-XWB Double Arm Float Valve with Pivot & Extra Weighted Ball – Inline (catalog part number 12FVDP-XWB-IL or 12FVDP-XWB) is an extra-heavy-duty, balanced-leverage, maximum-bore commercial mechanical water-level control valve engineered for pressurized or submerged inline piping inside mega-capacity aquatic surge tanks, collector pits, and balance tanks. Constructed with a corrosion-proof Schedule 80 PVC inline body, a symmetrical twin-arm clevis pivot linkage, and an internally ballasted Extra Weighted Ball (-XWB), it mounts directly in-series within a closed or submerged 12-inch piping run to modulate ultra-high-volume flow without air entrainment while delivering balanced axial closing force and amplified downward opening torque to overcome line pressure and shaft seal friction across a 113.1 sq. in. bore.
| Parameter | Specification |
| Part / Model Reference | 12FVDP-XWB / 12FVDP-XWB-IL (12" Float Valve, Double-Arm, PVC Inline Body with Dual Pivot Linkage & Extra Weighted Ball) |
| Nominal Pipe Size | 12.0 in (300 mm / DN300) |
| Connection Configuration | Inline (Inlet x Outlet): Female IPS Slip Sockets (Schedule 40/80 PVC, 12.750" ID) or ANSI Class 150 Flanged ends for continuous inline piping integration |
| Actuation & Pivot Mechanism | Articulated Double-Arm Yoke Lever with Dual Clevis Pivot Hinges and Extra-Weighted Ballast Float (symmetrical dual-side extra-heavy-duty arms providing balanced axial torque; no electricity or compressed air required) |
| Valve Body & Housing Material | Heavy-duty machined Schedule 80 PVC (non-corrosive, UV- and chlorine-resistant) |
| Pivot Arms, Hinges & Fasteners | Dual extra-heavy-gauge 316 Marine-Grade Stainless Steel arms, structural cross-yoke, machined pivot clevises, hinge pins, and locknuts (eliminates torsional deflection and galvanic corrosion) |
| Float Ball / Ballast Element | Extra Weighted Ball (XWB): Heavy-wall seamless HDPE, Polypropylene, or 316 Stainless Steel oversized spherical/cylindrical float (typically 18" to 20" diameter, or high-buoyancy dual-float assembly) internally ballasted / weighted for high downward breakaway torque on a 12" bore |
| Internal Seat & Disc Seal | Replaceable thick-wall EPDM or Neoprene elastomer throttling disc / flapper with low-friction O-ring shaft seals |
| Recommended Flow Capacity | Approx. 1,800 to 3,600+ US gpm (408.8 to 817.6+ m³/h) depending on available gravity or low-pressure line head |
| Maximum Operating Pressure | 25 to 35 psi (1.72 to 2.41 bar) — reinforced Schedule 80 PVC inline housing and dual-arm yoke withstand higher differential line pressures and downstream piping containment |
| Operating Temperature Range | 32°F to 120°F (0°C to 49°C) |
| Level Adjustment Range | Indexed dual-pivot clevises and adjustable float rod pitch allow precise field calibration of operating water elevation (+/- 4 to 8 in) |
| Compliance / Standards | NSF/ANSI Standard 50 compatible materials; meets Model Aquatic Health Code (MAHC) surge tank level control requirements |
Hydraulic & Mechanical Operating Details
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Nomenclature Breakdown:
12= 12-inch nominal bore;FV= Float Valve;D= Double-Arm yoke lever mechanism;P= PVC body construction with articulated dual pivots;XWB= Extra Weighted Ball float assembly;Inline= dual-ended (inlet/outlet) inline housing. -
Dual-Pivot Balance + Extra Weighted Ball (
XWB) Synergy on a 12" Bore: Scaling up to a 12-inch inline throttling disc (113.1 sq. in. cross-sectional area—44% larger than a 10" bore and more than double an 8" bore) generates extreme hydraulic surface loading and substantial shaft O-ring breakaway resistance. The internally ballasted Extra Weighted Ball supplies heavy downward gravitational deadweight to reliably crack the 12" valve open when tank levels drop under differential line pressure, while the twin Double-Arm 316 stainless steel yoke and matched clevis pivots distribute upward buoyancy evenly across both sides of the valve shaft—eliminating side-loading, torsional binding, and uneven seat wear during shutoff. -
Inline Piping Integration: Installed directly in-series along submerged main-drain modulation headers, suction-equalizer lines, or enclosed gravity transfer pipes inside maximum-capacity surge tanks (Olympic 50-meter competition complexes, multi-pool municipal aquatic centers, surf lagoons, and wave pools), keeping ultra-high-volume flow contained within the header without splashing or air entrainment into pump suction manifolds.
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Shipping Weight: Approx. 82 to 112 lbs (37.2 to 50.8 kg) complete with 12" Schedule 80 PVC inline valve body, dual extra-heavy-duty 316 SS pivot arms and clevis assemblies, cross-yoke linkage hardware, and oversized extra-weighted ballast float.
