Commercial Pool and Spa Supplies
6" FVDP Double Arm Float Valve with Pivot - Open Pipe
6" FVDP Double Arm Float Valve with Pivot - Open Pipe
SKU:8FVS-OP
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The 8" FVS Single Arm Float Valve – Open Pipe (also cataloged as 8FVSP-OP in standard commercial PVC aquatic flow-control lines) is a heavy-duty, 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 valve automatically modulates or shuts off massive gravity return flows from perimeter gutters, skimmers, and main drains as water levels rise—preventing surge tank overflow during heavy bather surges while maintaining positive flooded suction head for main circulation pumps.
| Parameter | Specification |
| Equipment / Part Reference | 8" FVS Single Arm Float Valve – Open Pipe (8FVSP-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 Single-Arm Lever Linkage (direct proportional buoyancy actuation; 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 Arm & Linkage Hardware | Heavy-gauge 316 Marine-Grade Stainless Steel arm, machined clevis pivot, hinge pins, and locknuts (eliminates galvanic corrosion and chlorine stress-cracking) |
| Float Ball / Buoyancy Element | Heavy-wall seamless Polyethylene (HDPE), Polypropylene, or 316 Stainless Steel oversized spherical/cylindrical float (typically 14" to 16" diameter to generate sufficient closing torque on an 8" bore) |
| 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 1,500 US gpm (170.3 to 340.7 m³/h) at standard gravity head (1 to 3 ft water column) |
| Maximum Operating Pressure | 10 to 15 psi (0.69 to 1.03 bar) — engineered strictly for low-head gravity gutter and collector lines |
| 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 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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Large-Bore Gravity Throughput: With an 8-inch nominal bore (50.3 sq. in. cross-sectional flow area—nearly double that of a 6" valve), this unit handles high-volume perimeter overflow gutter systems on Olympic 50-meter pools, competition diving wells, and leisure wave pools without creating hydraulic backup in deck channels.
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Proportional Float Modulation: As surge tank water levels drop during pump startup or backwash drawdowns, the oversized 14"–16" float descends, swinging the single pivot arm downward to open the 8" bore completely. As pool return water refills the pit, buoyancy lifts the arm to progressively throttle and close the EPDM disc against the machined valve seat.
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Open-Pipe Installation: Built specifically for installations where the 8" gravity return pipe terminates cleanly inside the surge tank wall without a bolted ANSI flange. The female PVC hub slips directly over the 8" pipe stub and is secured via PVC solvent cement or stainless steel mechanical locking screws.
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Shipping Weight: Approx. 32 to 44 lbs (14.5 to 20.0 kg) complete with 8" valve body, heavy-duty 316 SS single pivot arm, adjustable linkage hardware, and oversized float ball.
