Commercial Pool and Spa Supplies
8" FVD Double Arm Float Valve - Open Pipe
8" FVD Double Arm Float Valve - Open Pipe
SKU:8FVD-OP
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The 8" FVD Double Arm Float Valve – Open Pipe (also cataloged as 8FVDP-OP in standard commercial PVC aquatic flow-control lines) is a heavy-duty, balanced-leverage large-bore mechanical water-level control valve engineered for high-volume commercial aquatic surge tanks, collector pits, balance tanks, and open-channel gravity return systems. Installed directly onto an open-ended 8-inch horizontal or downward-turned gravity return pipe stub inside a surge pit, the dual-arm yoke architecture distributes massive closing forces symmetrically across the 8-inch valve disc—preventing side-loading, torsional twisting, and premature seat wear under elevated gravity static heads or turbulent surge conditions.
| Parameter | Specification |
| Equipment / Part Reference | 8" FVD Double Arm Float Valve – Open Pipe (8FVDP-OP) |
| Nominal Pipe Size | 8.0 in (200 mm / DN200) |
| Inlet Connection Type | Open-Pipe Mount: Female Slip Socket (Schedule 40/80 IPS, 8.625" ID socket) or Slide-On Locking Hub for bare 8.0" nominal (8.625" actual OD) open pipe end |
| Discharge Configuration | Unobstructed Open-Discharge / Free-Fall Port (zero downstream backpressure) |
| Actuation Mechanism | Mechanical Double-Arm Yoke Lever Linkage (symmetrical dual-side arms providing balanced axial closing force; requires no electricity or compressed air) |
| Valve Body & Housing Material | Heavy-duty machined Schedule 80 PVC, CPVC, or molded high-impact ABS / 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 / Buoyancy Element | Heavy-wall seamless Polyethylene (HDPE), Polypropylene, or 316 Stainless Steel oversized spherical/cylindrical float (typically 14" to 16" diameter) |
| Seat & Disc Seal Material | Replaceable thick-wall EPDM or Neoprene elastomer disc / flapper seal for drip-tight shutoff |
| Recommended Gravity Flow Capacity | Approx. 750 to 1,600 US gpm (170.3 to 363.4 m³/h) at standard gravity head (1 to 4 ft water column) |
| Maximum Operating Pressure | 15 to 25 psi (1.03 to 1.72 bar) — significantly higher shutoff stability and pressure tolerance than single-arm 8" (8FVSP-OP) designs due to balanced double-arm leverage |
| 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 shutoff water elevation (+/- 4 to 8 in) |
| Compliance / Standards | NSF/ANSI Standard 50 compatible materials; meets Model Aquatic Health Code (MAHC) surge tank overflow protection guidelines |
Hydraulic & Mechanical Operating Details
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Balanced Dual-Arm Seating on 8-Inch Bores: Across a 50.3 sq. in. orifice area, even modest gravity head generates substantial hydraulic seating resistance. The 8" FVD Double Arm straddles both sides of the valve housing with twin heavy-gauge 316 stainless steel arms tied into a rigid cross-yoke, translating buoyancy from the 14"–16" float into uniform, perpendicular closing force against the EPDM seat—preventing disc cocking, chatter, or uneven seal wear.
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Open-Pipe Installation: Built specifically for installations where the 8" perimeter gutter or main-drain gravity line terminates cleanly inside the surge tank wall without a bolted ANSI flange. The female PVC hub slips directly onto the 8" pipe stub and is secured via PVC solvent cement or stainless steel mechanical locking screws.
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Surge & Turbulence Stability: The twin-arm structural yoke resists lateral deflection caused by splashing, wave action, or cascading gutter discharge inside turbulent balance pits on Olympic 50-meter pools, wave lagoons, and water parks.
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Shipping Weight: Approx. 38 to 52 lbs (17.2 to 23.6 kg) complete with 8" valve body, dual heavy-duty 316 SS pivot arms, cross-yoke linkage hardware, and oversized float ball.
