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Commercial Pool and Spa Supplies

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

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

4FVSP-XMB

$3,282.00
$3,282.00
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Shipping calculated at checkout.

The 4" FVSP-XWB Single Arm Float Valve with Pivot & Extra Weighted Ball – Inline (catalog part number 4FVSP-XWB-IL or 4FVSP-XWB) is a heavy-duty commercial mechanical water-level control valve engineered for pressurized or submerged inline piping inside 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 4-inch piping run to modulate flow without air entrainment while providing amplified downward gravitational torque to overcome line pressure and shaft seal friction as tank levels drop.

Parameter Specification
Part / Model Reference 4FVSP-XWB / 4FVSP-XWB-IL (4" Float Valve, Single-Arm, PVC Inline Body with Pivot Linkage & Extra Weighted Ball)
Nominal Pipe Size 4.0 in (100 mm / DN100)
Connection Configuration Inline (Inlet x Outlet): Female IPS Slip Sockets (Schedule 40/80 PVC, 4.50" 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 spherical/cylindrical float (typically 10" to 12" diameter) internally ballasted / weighted for high downward breakaway torque
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. 180 to 380 US gpm (40.9 to 86.3 m³/h) depending on available gravity or low-pressure line head
Maximum Operating Pressure 25 to 50 psi (1.72 to 3.45 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: 4 = 4-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: Because inline float valves enclose the throttling disc within a pressurized or submerged pipe run, internal shaft O-rings and differential line pressure create higher breakaway resistance than open-pipe flappers. The articulated 316 stainless steel pivot hinge translates the deadweight of the internally ballasted Extra Weighted Ball into crisp, high-torque downward opening force when water levels drop, while retaining sufficient net buoyancy displacement to close drip-tight when submerged.

  • Inline Piping Integration: Installed directly in-series along submerged main-drain modulation lines, suction-equalizer headers, or enclosed gravity transfer pipes inside the surge tank, eliminating surface splashing and air entrainment into pump suction headers.

  • Shipping Weight: Approx. 18 to 26 lbs (8.2 to 11.8 kg) complete with 4" Schedule 80 PVC inline valve body, 316 SS single pivot arm and clevis assembly, adjustable linkage hardware, and extra-weighted ballast float.

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