Commercial Pool and Spa Supplies
4" FVD Double Arm Float Valve - Open Pipe
4" FVD Double Arm Float Valve - Open Pipe
SKU:4FVD-OP
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The 4" FVD Double Arm Float Valve – Open Pipe (Float Valve Double-arm, 4-inch nominal pipe size) is a heavy-duty, balanced-leverage mechanical water-level control valve engineered for commercial aquatic surge tanks, collector pits, balance tanks, and open-channel gravity return systems. Installed directly onto an open-ended 4-inch horizontal or downward-turned gravity return pipe inside a surge pit, the dual-arm yoke architecture distributes closing forces evenly across the valve disc—preventing side-loading, binding, and premature seat wear under higher gravity static heads or turbulent surge conditions.
| Parameter | Specification |
| Equipment Reference | 4" FVD Double Arm Float Valve – Open Pipe (Commercial Surge Tank Level Control) |
| Nominal Pipe Size | 4.0 in (100 mm / DN100) |
| Inlet Connection Type | Open-Pipe Mount: Female Slip Socket (Schedule 40/80 IPS) or Clamp-On / Locking Sleeve for direct mounting onto bare 4.0" nominal (4.50" 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 seating 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 10" to 12" diameter) |
| Seat & Disc Seal Material | Replaceable thick-wall EPDM or Neoprene elastomer disc / flapper seal for drip-tight shutoff |
| Recommended Gravity Flow Capacity | Approx. 180 to 380 US gpm (40.9 to 86.3 m³/h) at standard gravity head (1 to 4 ft water column) |
| Maximum Operating Pressure | 25 to 35 psi (1.72 to 2.41 bar) — enhanced shutoff capability over single-arm 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: Unlike single-arm float valves where buoyancy lifts from one side of the valve body, the FVD Double Arm utilizes two parallel stainless steel arms straddling both sides of the 4" valve housing and tying into a central yoke. This applies uniform, perpendicular closing pressure against the EPDM seat, eliminating cocking or uneven wear when closing against elevated gravity return heads.
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Open-Pipe Installation: Built specifically for installations where the 4" gutter or main-drain gravity line terminates cleanly inside the surge tank wall without a bolted flange. The valve hub slips directly over the 4" PVC pipe stub and is secured via solvent welding 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 cascading gutter water inside turbulent balance pits, ensuring consistent shutoff elevation without chatter.
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Shipping Weight: Approx. 15 to 22 lbs (6.8 to 10.0 kg) complete with 4" valve body, dual 316 SS pivot arms, cross-yoke linkage hardware, and float ball.
