Commercial Pool and Spa Supplies
4" FVSP Single Arm Float Valve With Pivot - Open Pipe
4" FVSP Single Arm Float Valve With Pivot - Open Pipe
SKU:4FVSP-OP
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The 4FVSP-OP (4” Float Valve Single-arm PVC – Open Pipe) is the catalog part number designation for a 4-inch commercial single-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 to modulate pool gutter/skimmer return flow and prevent surge tank overflow.
| Parameter | Specification |
| Part / Model Number | 4FVSP-OP (4" Float Valve, Single-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 Single-Arm Lever Linkage (direct buoyancy actuation; no electrical power or pneumatic air required) |
| Pivot Arm & Fasteners | 316 Marine-Grade Stainless Steel arm, pivot pin, and locking hardware |
| Float Ball / Buoyancy Element | Seamless heavy-wall HDPE or Polypropylene spherical/cylindrical float (typically 8" to 12" diameter) |
| Valve Disc & Seat Seal | Replaceable thick-wall EPDM or Neoprene elastomer disc / flapper seal |
| Recommended Gravity Flow Capacity | Approx. 180 to 350 US gpm (40.9 to 79.5 m³/h) at 1 to 3 ft gravity head |
| Maximum Operating Pressure | 15 to 25 psi (1.03 to 1.72 bar) — rated for low-head gravity return lines |
| Operating Temperature Range | 32°F to 120°F (0°C to 49°C) |
| Shutoff Level Adjustment | Slotted / indexed float 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;S= Single-Arm lever mechanism;P= PVC body construction;OP= Open-Pipe slip/clamp mount (as opposed to-FLfor ANSI flanged connections). -
Mounting Orientation: Designed to slip directly onto a horizontal or downward-turned 4" Schedule 40/80 PVC gravity pipe stub protruding through the surge tank wall, secured via PVC solvent cement or stainless steel set screws.
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Shipping Weight: Approx. 12 to 18 lbs (5.4 to 8.2 kg) complete with 4" PVC valve body, 316 SS single pivot arm, adjustable linkage hardware, and float ball.
