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Commercial Pool and Spa Supplies

8" FVD-XWB Double Arm Float Valve with Extra Weighted Ball - Inline

8" FVD-XWB Double Arm Float Valve with Extra Weighted Ball - Inline

8FVD-XMB

$4,240.00
$4,240.00
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Shipping calculated at checkout.

The 8" FVD-XWB Double Arm Float Valve with Extra Weighted Ball – Inline (also cataloged as 8FVDP-XWB-IL or 8FVD-XWB in commercial aquatic flow-control lines) is a heavy-duty, balanced-leverage, large-bore mechanical water-level control valve engineered for pressurized or submerged inline piping inside high-volume commercial aquatic surge tanks, collector pits, and balance tanks. Combining a dual-ended Inline housing with a symmetrical Double-Arm yoke linkage and an internally ballasted Extra Weighted Ball (-XWB), it delivers balanced axial closing force and amplified downward opening torque—preventing shaft binding, side-loading, or sluggish actuation under elevated line pressures, turbulent surge conditions, or high internal seal friction across a 50.3 sq. in. bore.

Parameter Specification
Equipment / Part Reference 8" FVD-XWB Double Arm Float Valve with Extra Weighted Ball – Inline
Nominal Pipe Size 8.0 in (200 mm / DN200)
Connection Configuration Inline (Inlet x Outlet): Female IPS Slip Sockets (Schedule 40/80 PVC, 8.625" ID) or ANSI Class 150 Flanged ends for continuous inline piping integration
Actuation Mechanism Mechanical Double-Arm Yoke Lever Linkage with Extra-Weighted Ballast Float (symmetrical dual-side arms providing balanced axial torque; requires no electricity or compressed air)
Valve Body & Housing Material Heavy-duty machined Schedule 80 PVC, CPVC, or reinforced FRP composite
Pivot Arms & Linkage Hardware Dual heavy-gauge 316 Marine-Grade Stainless Steel arms, structural cross-yoke, machined pivot clevises, hinge pins, and locknuts (eliminates torsional twisting 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 14" to 16" diameter) internally ballasted / weighted for high downward breakaway torque on an 8" 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. 750 to 1,600 US gpm (170.3 to 363.4 m³/h) depending on available gravity or low-pressure line head
Maximum Operating Pressure 25 to 40 psi (1.72 to 2.76 bar) — reinforced 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

  • Dual-Arm Balance + Extra Weighted Ball (XWB) Synergy on an 8" Bore: Scaling up to an 8-inch inline throttling disc (50.3 sq. in. cross-sectional area—nearly double a 6" bore) substantially increases hydraulic surface loading and shaft O-ring breakaway resistance. The internally ballasted Extra Weighted Ball supplies high downward gravitational deadweight to reliably crack the 8" valve open when tank levels drop under differential line pressure, while the twin Double-Arm 316 stainless steel yoke distributes 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 the surge tank, keeping high-volume flow contained within the header without splashing or air entrainment into pump suction manifolds.

  • Nomenclature Breakdown: 8 = 8-inch nominal bore; FV = Float Valve; D = Double-Arm yoke lever mechanism; XWB = Extra Weighted Ball float assembly; Inline = dual-ended (inlet/outlet) inline body.

  • Shipping Weight: Approx. 48 to 64 lbs (21.8 to 29.0 kg) complete with 8" inline valve body, dual heavy-duty 316 SS pivot arms, cross-yoke linkage hardware, and oversized extra-weighted ballast float.

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