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Commercial Pool and Spa Supplies

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

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

4FVD-XMB

$3,756.00
$3,756.00
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Shipping calculated at checkout.

The 4" FVD-XWB Double Arm Float Valve with Extra Weighted Ball – Inline (also cataloged as 4FVDP-XWB-IL or 4FVD-XWB in commercial aquatic flow-control lines) is a heavy-duty, balanced-leverage mechanical water-level control valve engineered for pressurized or submerged inline piping inside commercial aquatic surge tanks, collector pits, and balance tanks. Combining a dual-ended Inline housing with a symmetrical Double-Arm yoke linkage and an 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.

Parameter Specification
Equipment / Part Reference 4" FVD-XWB Double Arm Float Valve with Extra Weighted Ball – Inline
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 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 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 disc / butterfly-style internal throttling element with low-friction shaft seals
Recommended Flow Capacity Approx. 180 to 400 US gpm (40.9 to 90.8 m³/h) depending on available gravity or low-pressure line head
Maximum Operating Pressure 35 to 50 psi (2.41 to 3.45 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: Inline valve bodies rely on sealed internal shafts and throttling discs that experience both hydraulic pressure differentials and O-ring seal friction. The internally ballasted Extra Weighted Ball supplies high downward gravitational force to reliably crack the valve open when tank levels drop, 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 flow contained within the header without splashing or air entrainment.

  • Nomenclature Breakdown: 4 = 4-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. 22 to 30 lbs (10.0 to 13.6 kg) complete with 4" inline valve body, dual 316 SS pivot arms, cross-yoke linkage hardware, and extra-weighted ballast float.

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