Commercial Pool and Spa Supplies
8" FVDP Double Arm Float Valve with Pivot - Open Pipe
8" FVDP Double Arm Float Valve with Pivot - Open Pipe
SKU:8FVDP-OP
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The 8" FVDP Double Arm Float Valve with Pivot – Open Pipe (catalog part number 8FVDP-OP) is a heavy-duty, balanced-leverage large-bore commercial mechanical water-level control valve engineered for high-volume aquatic surge tanks, collector pits, balance tanks, and open-channel gravity return systems. Constructed with a corrosion-proof Schedule 80 PVC body and a symmetrical twin-arm pivot linkage, it mounts directly onto an open-ended 8-inch gravity return pipe stub inside a surge pit to automatically modulate or shut off massive perimeter gutter and skimmer return flows as water levels rise—preventing surge tank overflow while maintaining positive flooded suction head for main circulation pumps.
| Parameter | Specification |
| Part / Model Reference | 8FVDP-OP (8" Float Valve, Double-Arm, PVC Body with Dual Pivot Linkage, Open-Pipe Mount) |
| 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 & Pivot Mechanism | Articulated Double-Arm Yoke Lever with Dual Clevis Pivot Hinges (symmetrical dual-side arms providing balanced axial closing force; 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 / Buoyancy Element | Seamless heavy-wall 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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Nomenclature Breakdown:
8= 8-inch nominal bore;FV= Float Valve;D= Double-Arm yoke lever mechanism;P= PVC body construction;OP= Open-Pipe slip/clamp mount (as opposed to-FLfor ANSI Class 150 flanged connections). -
Balanced Dual-Pivot Geometry: Across a 50.3 sq. in. orifice area, even modest gravity head generates substantial hydraulic seating resistance. Straddling both sides of the PVC housing with twin heavy-gauge 316 stainless steel arms and matched pivot hinges translates buoyancy from the 14"–16" float into uniform, perpendicular closing force against the EPDM seat—preventing disc cocking, binding, chatter, or uneven seal wear during rapid water-level surges.
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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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Shipping Weight: Approx. 38 to 52 lbs (17.2 to 23.6 kg) complete with 8" PVC valve body, dual heavy-duty 316 SS pivot arms and clevis assemblies, cross-yoke linkage hardware, and oversized float ball.
