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Commercial Pool and Spa Supplies

8" FVS-XWB Single Arm Float Valve with Extra Weighted Ball - Inline

8" FVS-XWB Single Arm Float Valve with Extra Weighted Ball - Inline

8FVS-XMB

$2,797.00
$2,797.00
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Shipping calculated at checkout.

The 8" FVS-XWB Single Arm Float Valve with Extra Weighted Ball – Inline (also cataloged as 8FVSP-XWB-IL or 8FVS-XWB in commercial aquatic flow-control lines) is a heavy-duty, 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. Unlike Open-Pipe (-OP) models that discharge freely at the end of a pipe stub, the Inline configuration features both an inlet and an outlet connection to remain continuously plumbed within a closed or submerged 8-inch piping run. Equipped with an Extra Weighted Ball (-XWB), it provides amplified downward gravitational torque to ensure positive, reliable valve opening against upstream line pressure or internal shaft seal friction across a 50.3 sq. in. bore as surge tank water levels drop.

Parameter Specification
Equipment / Part Reference 8" FVS-XWB Single 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 Single-Arm Lever Linkage with Extra-Weighted Ballast Float (requires no electricity or compressed air)
Valve Body & Housing Material Heavy-duty machined Schedule 80 PVC, CPVC, or reinforced FRP composite
Pivot Arm & Linkage Hardware Heavy-gauge 316 Marine-Grade Stainless Steel arm, machined clevis pivot, hinge pins, and locknuts (eliminates galvanic corrosion and chlorine stress-cracking)
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 1,500 US gpm (170.3 to 340.7 m³/h) depending on available gravity or low-pressure line head
Maximum Operating Pressure 20 to 35 psi (1.38 to 2.41 bar) — reinforced inline housing withstands downstream piping containment and higher static line heads than open-discharge models
Operating Temperature Range 32°F to 120°F (0°C to 49°C)
Level Adjustment Range Indexed pivot clevis and adjustable float rod pitch allow 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

  • Function of the Extra Weighted Ball (XWB) 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 both hydraulic surface loading and shaft O-ring breakaway resistance. A standard hollow float can hang or open sluggishly when tank levels drop under differential line pressure. The internally ballasted Extra Weighted Ball adds high deadweight leverage on the downward stroke to forcefully crack the 8" valve open while retaining sufficient net buoyancy displacement to close drip-tight when submerged.

  • Inline Piping Integration: Installed directly in-series along submerged suction-equalizer headers, main-drain modulation lines, or enclosed gravity transfer pipes inside the surge tank, directing high-volume flow cleanly into downstream headers without surface splashing or air entrainment into pump suction manifolds.

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

  • Shipping Weight: Approx. 42 to 56 lbs (19.1 to 25.4 kg) complete with 8" inline valve body, heavy-duty 316 SS single pivot arm, adjustable linkage hardware, and oversized extra-weighted ballast float.

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