Commercial Pool and Spa Supplies
6" FVD Double Arm Float Valve - Open Pipe
6" FVD Double Arm Float Valve - Open Pipe
SKU:6FVS-OP
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The 6" FVD Double Arm Float Valve – Open Pipe (also cataloged as 6FVDP-OP in standard commercial PVC aquatic flow-control lines) is a heavy-duty, balanced-leverage mechanical water-level control valve engineered for high-flow commercial aquatic surge tanks, collector pits, balance tanks, and open-channel gravity return systems. Installed directly onto an open-ended 6-inch horizontal or downward-turned gravity return pipe inside a surge pit, the dual-arm yoke architecture distributes closing forces symmetrically across the large 6-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 | 6" FVD Double Arm Float Valve – Open Pipe (6FVDP-OP) |
| Nominal Pipe Size | 6.0 in (150 mm / DN150) |
| Inlet Connection Type | Open-Pipe Mount: Female Slip Socket (Schedule 40/80 IPS, 6.625" ID socket) or Slide-On Locking Hub for bare 6.0" nominal (6.625" 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 316 Marine-Grade Stainless Steel arms, cross-yoke, clevis pins, and locknuts (eliminates torsional twisting and galvanic corrosion) |
| Float Ball / Buoyancy Element | Heavy-wall seamless Polyethylene (HDPE), Polypropylene, or 316 Stainless Steel spherical/cylindrical float (typically 12" to 14" diameter) |
| Seat & Disc Seal Material | Replaceable thick-wall EPDM or Neoprene elastomer disc / flapper seal for drip-tight shutoff |
| Recommended Gravity Flow Capacity | Approx. 400 to 850 US gpm (90.8 to 193.1 m³/h) at standard gravity head (1 to 4 ft water column) |
| Maximum Operating Pressure | 20 to 30 psi (1.38 to 2.07 bar) — enhanced shutoff capability over single-arm 6" (6FVSP-OP) designs due to balanced double-arm mechanical advantage |
| Operating Temperature Range | 32°F to 120°F (0°C to 49°C) |
| Level Adjustment Range | Adjustable dual-arm pitch / float rod indexing allows 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 Large Bores: On a 6-inch orifice, the hydraulic force acting against the closing disc is more than double that of a 4-inch valve. The 6" FVD Double Arm straddles both sides of the valve housing with twin 316 stainless steel arms tied into a central cross-yoke, applying uniform, perpendicular closing pressure against the EPDM seat to prevent cocking, chatter, or uneven seal wear.
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Open-Pipe Installation: Built specifically for installations where the 6" gravity gutter or main-drain line terminates cleanly inside the surge tank wall without a bolted flange. The valve hub slips directly onto the 6" PVC pipe stub and is secured via solvent cement or stainless steel mechanical locking screws.
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Surge & Turbulence Stability: The rigid dual-arm frame resists lateral deflection caused by splashing, wave action, or heavy cascading gutter discharge inside turbulent balance pits, maintaining consistent shutoff elevation.
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Shipping Weight: Approx. 24 to 34 lbs (10.9 to 15.4 kg) complete with 6" valve body, dual 316 SS pivot arms, cross-yoke linkage hardware, and oversized float ball.
