Commercial Pool and Spa Supplies
8" FVDP-XWB Double Arm Float Valve with Pivot &Extra Weighted Ball - Inline
8" FVDP-XWB Double Arm Float Valve with Pivot &Extra Weighted Ball - Inline
SKU:8FVDP-XMB
Couldn't load pickup availability
The 8" FVDP-XWB Double Arm Float Valve with Pivot & Extra Weighted Ball – Inline (catalog part number 8FVDP-XWB-IL or 8FVDP-XWB) is a heavy-duty, balanced-leverage, 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, 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 8-inch piping run to modulate high-volume flow without air entrainment while delivering balanced axial closing force and amplified downward opening torque to overcome line pressure and shaft seal friction across a 50.3 sq. in. bore.
| Parameter | Specification |
| Part / Model Reference | 8FVDP-XWB / 8FVDP-XWB-IL (8" Float Valve, Double-Arm, PVC Inline Body with Dual 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 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 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 1,600 US gpm (170.3 to 363.4 m³/h) depending on available gravity or low-pressure line head |
| Maximum Operating Pressure | 25 to 40 psi (1.72 to 2.76 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
-
Nomenclature Breakdown:
8= 8-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 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 internally ballasted Extra Weighted Ball supplies high downward gravitational deadweight to reliably crack the 8" valve open when tank levels drop under differential line pressure, 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 high-volume flow contained within the header without splashing or air entrainment into pump suction manifolds.
-
Shipping Weight: Approx. 48 to 64 lbs (21.8 to 29.0 kg) complete with 8" Schedule 80 PVC inline valve body, dual heavy-duty 316 SS pivot arms and clevis assemblies, cross-yoke linkage hardware, and oversized extra-weighted ballast float.
