The Jandy Slide Backwash Valve is a two-position valve designed for use with sand or diatomaceous earth (DE) filters, facilitating both normal filtration and backwash modes for pool and spa systems. Its primary function is to control water flow, allowing for efficient filtration and the necessary backwashing process to clean the filter media.
Function Description:
The valve operates by moving a piston, which is controlled by a handle that can be either fully extended (pulled up) or fully depressed (pushed down). This two-position design means the valve cannot be throttled, ensuring clear distinction between filtration and backwash modes.
In normal filtration mode:
- For Jandy DEL, DEV, and JS series filters, the handle must be fully depressed (pushed down), and the stainless steel pin on the piston locks into the position bracket. Water flows from the pump into PORT B, through the filter, and out PORT A to the heater or pool return lines. Waste water exits PORT E as needed.
- For other manufacturers' filters with the filter top port as the inlet, the handle must be fully extended (pulled up). Water flows from the pump into PORT B, through the filter, and out PORT E to the heater or pool return lines. Waste water exits PORT A as needed.
In backwash mode:
- For Jandy DEL, DEV, and JS series filters, the handle must be fully extended (pulled up).
- For other manufacturers' filters with the filter top port as the inlet, the handle must be fully depressed (pushed down), and the stainless steel pin on the piston locks into the position bracket.
The valve is designed to be installed and serviced by authorized personnel qualified in pool/spa installation and maintenance. Improper installation or operation will void the warranty and could lead to electrical hazards, serious injury, or property damage. It is crucial to turn off all electrical power to the system before inspecting or troubleshooting any leaking valves or performing any maintenance.
Important Technical Specifications:
- Center-to-Center Dimension: The SVLV8 model is designed for filters with an 8-inch center-to-center dimension (distance between the center of the inlet port and the center of the outlet port).
- Versa-Coupler Compatibility: When combined with the Jandy Versa-Coupler (p/n 8044), the valve can be used on filters with center-to-center dimensions ranging from 7 to 9 inches.
- Model Numbers:
- SVLV8 (with unions): Mounts to Jandy DEL48 or DEL60 model filters (filter outlet is the top port).
- BWVL-SLD: Mounts to Jandy DEV48, DEV60, or JS series model filters.
- SVLV2 (without unions): Used with the Versa-Coupler Kit (p/n 8044) for Pentair® or Sta-Rite® filters.
- Head Loss Curve: The manual includes a "Slide Valve Head Loss Curve" (Figure 10) which illustrates the relationship between flow rate (GPM) and design head loss (Feet Head) or design pressure drop (psi) when the valve is used with a DE filter. For example, at 50 GPM, the design head loss is approximately 4.6 feet, and the design pressure drop is about 2.0 psi. At 100 GPM, these values increase to approximately 9.2 feet and 4.0 psi, respectively.
- Materials: The valve utilizes o-rings for sealing, including a lid o-ring, a top shaft o-ring (black), a bottom shaft o-ring (purple), and union tail piece o-rings. Roll pins are used for the handle (1" long) and shaft (13/16" long).
Usage Features:
- Ease of Installation: The SVLV8 model comes with unions for direct mounting to compatible Jandy filters. For other filter types, the SVLV2 model is used in conjunction with Versa-Couplers, which are glued onto the valve and filter ports.
- Clear Port Labeling: The valve has molded labels on each port (PORT A, B, C, D, E) to guide plumbing connections for different filter types and modes.
- PORT A: To Pool / To Waste (depending on filter type and mode)
- PORT B: From Pump
- PORT C: Filter Outlet / Filter Inlet (depending on filter type)
- PORT D: Filter Inlet / Filter Outlet (depending on filter type)
- PORT E: To Waste / To Pool (depending on filter type and mode)
- Safety Warnings: The manual emphasizes critical safety warnings, particularly regarding turning off power and releasing pressure before any servicing or adjustments to prevent serious injury or equipment damage.
- Flushing System: Before normal operation, it is recommended to flush the system using backwash mode until the waste water runs clean, to avoid costly equipment damage.
Maintenance Features:
- Servicing:
- Turn off the system pump(s).
- Open the air release valve on the filter tank to release all pressure.
- Loosen the lid union nut.
- Pull the shaft assembly out of the valve by grabbing the handle.
- Inspect the shaft and o-rings (lid o-ring, top shaft o-ring, bottom shaft o-ring) for wear, cuts, cracks, and debris.
- Replace damaged o-rings with the Jandy o-ring and Roll Pin Replacement Kit (P/N R0442100).
- Wash the shaft, o-rings, and lid surface with clean water and dry with a lint-free cloth, ensuring all debris is removed.
- Lubricate o-rings with 100% silicone grease lubricant (e.g., Magic Lube® II); petroleum-based lubricants should not be used.
- Place the shaft back into the valve and tighten the lid union nut.
- Return the handle to the normal operating position and check for proper water flow.
- Winterizing:
- Turn off the system pump(s).
- Open the air release valve on the filter tank to release all pressure.
- Loosen the lid union nut.
- Pull the shaft assembly out of the valve.
- Allow all water to drain out of the valve.
- Once all water is drained, place the shaft back into the valve and tighten the lid union nut.
- Position the Slide Valve in backwash mode (handle fully extended for Jandy filters, or fully depressed with pin locked for other manufacturers' filters with top inlet). This helps prevent damage from freezing.
- Replacement Parts: An exploded view and a replacement parts list are provided, including rebuild kits (o-rings, roll pins, index plate/lid) for different models (SVLV8, SVLV2, BWVL-SLD), shaft replacement kits, and handle replacement kits. This facilitates easy identification and ordering of necessary components for repairs.
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