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Commercial Pool and Spa Supplies

8" FVSP-XWB Single Arm Float Valve with Pivot & Extra Weighted Ball - Inline

8" FVSP-XWB Single Arm Float Valve with Pivot & Extra Weighted Ball - Inline

8FVSP-XMB

$3,851.00
$3,851.00
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Shipping calculated at checkout.

The 8" FVSP-XWB Single Arm Float Valve with Pivot & Extra Weighted Ball – Inline (catalog part number 8FVSP-XWB-IL or 8FVSP-XWB) is a heavy-duty, large-bore commercial mechanical water-level control valve engineered for pressurized or submerged inline piping inside high-volume aquatic surge tanks, collector pits, and balance tanks. Constructed with a corrosion-proof Schedule 80 PVC inline body, an articulated single-arm clevis pivot linkage, and an internally ballasted Extra Weighted Ball (-XWB), it mounts directly in-series within a closed or submerged 8-inch piping run to modulate high-volume flow without air entrainment while providing amplified downward gravitational torque to overcome line pressure and shaft seal friction across a 50.3 sq. in. bore as tank levels drop.

Parameter Specification
Part / Model Reference 8FVSP-XWB / 8FVSP-XWB-IL (8" Float Valve, Single-Arm, PVC Inline Body with Pivot Linkage & Extra Weighted Ball)
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 & Pivot Mechanism Articulated Single-Arm Lever with Clevis Pivot Hinge and Extra-Weighted Ballast Float (direct mechanical actuation; no electricity or compressed air required)
Valve Body & Housing Material Heavy-duty machined Schedule 80 PVC (non-corrosive, UV- and chlorine-resistant)
Pivot Arm, Hinge & Fasteners Heavy-gauge 316 Marine-Grade Stainless Steel arm, machined pivot clevis, 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 Schedule 80 PVC 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

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

  • Pivot & Extra Weighted Ball (XWB) Mechanics 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 articulated 316 stainless steel clevis pivot hinge translates the deadweight of the internally ballasted Extra Weighted Ball into smooth, high-torque downward opening force when water levels drop under differential line pressure, while retaining sufficient net buoyancy displacement to close drip-tight when submerged.

  • 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 surface splashing or air entrainment into pump suction manifolds.

  • Shipping Weight: Approx. 42 to 56 lbs (19.1 to 25.4 kg) complete with 8" Schedule 80 PVC inline valve body, heavy-duty 316 SS single pivot arm and clevis assembly, adjustable linkage hardware, and oversized extra-weighted ballast float.

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