Commercial Pool and Spa Supplies
4" FVDP Double Arm Float Valve with Pivot - Open Pipe
4" FVDP Double Arm Float Valve with Pivot - Open Pipe
SKU:4FVDP-OP
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The 4FVDP-OP (4” Float Valve Double-arm PVC – Open Pipe) is the catalog part number designation for a 4-inch commercial double-arm PVC mechanical water-level control valve engineered for open-pipe discharge inside aquatic surge tanks, collector pits, and balance tanks. Manufactured for non-corrosive commercial pool service (standard across aquatic flow-control lines such as Mer-Made, AquaStar, and Hayward commercial series), it mounts directly onto an open-ended 4-inch gravity return pipe stub and utilizes a balanced dual-arm yoke linkage to prevent side-loading and binding under elevated static heads or turbulent surge conditions.
| Parameter | Specification |
| Part / Model Number | 4FVDP-OP (4" Float Valve, Double-Arm, PVC Body, Open-Pipe Mount) |
| Nominal Pipe Size | 4.0 in (100 mm / DN100) |
| Inlet Connection Type | Open-Pipe Mount: Female Slip Socket (Schedule 40/80 IPS, 4.50" ID socket) or Slide-On Locking Hub for bare 4.0" nominal pipe ends |
| Discharge Configuration | Open-Discharge / Free-Fall Port (zero downstream backpressure) |
| Body & Housing Material | Heavy-duty machined Schedule 80 PVC (non-corrosive, UV- and chlorine-resistant) |
| Actuation Mechanism | Mechanical Double-Arm Yoke Lever Linkage (symmetrical dual-side arms providing balanced axial closing force; no electricity or compressed air required) |
| Pivot Arms & Fasteners | Dual 316 Marine-Grade Stainless Steel arms, cross-yoke, clevis pins, and locknuts |
| Float Ball / Buoyancy Element | Seamless heavy-wall HDPE or Polypropylene spherical/cylindrical float (typically 10" to 12" diameter) |
| Valve Disc & Seat Seal | 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 1 to 4 ft gravity head |
| Maximum Operating Pressure | 25 to 35 psi (1.72 to 2.41 bar) — increased shutoff rating compared to single-arm (4FVSP-OP) designs |
| Operating Temperature Range | 32°F to 120°F (0°C to 49°C) |
| Shutoff Level Adjustment | Slotted / indexed dual-arm linkage allows 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 requirements |
Application & Installation Notes
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Nomenclature Breakdown:
4= 4-inch pipe size;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). -
Structural & Hydraulic Advantage: Straddling both sides of the 4" PVC body with twin stainless steel arms applies uniform, axial seating pressure against the EPDM disc, preventing cocking, chatter, or uneven seal wear in turbulent balance pits.
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Shipping Weight: Approx. 15 to 22 lbs (6.8 to 10.0 kg) complete with 4" PVC valve body, dual 316 SS pivot arms, cross-yoke linkage hardware, and float ball.
