Commercial Pool and Spa Supplies
4" FVDP-XWB Double Arm Float Valve with Pivot &Extra Weighted Ball - Inline
4" FVDP-XWB Double Arm Float Valve with Pivot &Extra Weighted Ball - Inline
SKU:4FVDP-XMB
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The 4" FVDP-XWB Double Arm Float Valve with Pivot & Extra Weighted Ball – Inline (catalog part number 4FVDP-XWB-IL or 4FVDP-XWB) is a heavy-duty, balanced-leverage 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, a symmetrical twin-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 delivering balanced axial closing force and amplified downward opening torque to overcome line pressure and shaft seal friction.
| Parameter | Specification |
| Part / Model Reference | 4FVDP-XWB / 4FVDP-XWB-IL (4" Float Valve, Double-Arm, PVC Inline Body with Dual 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 Double-Arm Yoke Lever with Dual Clevis Pivot Hinges and Extra-Weighted Ballast Float (symmetrical dual-side arms providing balanced axial torque; no electricity or compressed air required) |
| Valve Body & Housing Material | Heavy-duty machined Schedule 80 PVC (non-corrosive, UV- and chlorine-resistant) |
| Pivot Arms, Hinges & Fasteners | 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 throttling disc / flapper with low-friction O-ring 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 Schedule 80 PVC 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
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Nomenclature Breakdown:
4= 4-inch nominal bore;FV= Float Valve;D= Double-Arm yoke lever mechanism;P= PVC body construction with articulated dual pivots;XWB= Extra Weighted Ball float assembly;Inline= dual-ended (inlet/outlet) inline housing. -
Dual-Pivot 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 deadweight to reliably crack the valve open when tank levels drop, while the twin Double-Arm 316 stainless steel yoke and matched clevis pivots distribute 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 into pump suction manifolds.
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Shipping Weight: Approx. 22 to 30 lbs (10.0 to 13.6 kg) complete with 4" Schedule 80 PVC inline valve body, dual 316 SS pivot arms and clevis assemblies, cross-yoke linkage hardware, and extra-weighted ballast float.
