Hayward Suction Cleaner Flow Adjustment: Setting Up the Flow Valve

Why Flow Adjustment Matters

Hayward's own manual opens the installation section with a clear statement: the majority of issues with suction cleaners are due to improper installation or expectations. Of those installation problems, incorrect flow is the leading cause by a wide margin. Too much flow causes the cleaner to move erratically, flip over, or ride up walls uncontrollably. Too little flow causes the cleaner to stall, fail to climb walls, or miss large areas of the pool.

The good news is that flow adjustment is simple once you understand the tools involved. This guide walks through every scenario a technician will encounter on a real installation.

The Flow Gauge: Your Primary Tool

The Hayward Flow Gauge is a clear cylindrical device that ships with every new Navigator Pro and PoolVac XL. It contains a floating black disk and two marked lines — MIN and MAX. To use it:

1. Thread the Flow Gauge onto the leader hose at the cleaner connection point.
2. Clip the gauge body to the first hose section so it stays visible during testing.
3. Turn on the pool pump and allow it to reach full operating speed.
4. Submerge the cleaner head completely and hold the assembly at approximately 12 inches below the water surface.
5. Observe the black disk. It must sit between the MIN and MAX lines.
6. If in range, remove the gauge and store it — it should be re-checked periodically, especially after filter service.

Skimmer Installation: Adjusting Flow

Single-port skimmer

Many older skimmers have only one port. When you use this port for the cleaner, the main drain suction is cut off from the filtration circuit, which can reduce total flow. If the skimmer has one port:

1. Close or disable the main drain valve at the equipment pad.
2. Direct all suction through the skimmer to the cleaner.
3. Check the Flow Gauge. If flow is above MAX, install the V094 regulator valve.

Two-port skimmer

With a two-port skimmer (separate ports for the skimmer basket and for the main drain or cleaner line), you have more flexibility:

1. Connect the cleaner hose to the cleaner-dedicated port.
2. Adjust the main drain valve at the equipment pad to balance suction — partially closing the main drain diverts more suction to the cleaner port.
3. Check the Flow Gauge after every valve adjustment.

Installing the V094 regulator valve (skimmer installations)

When system suction is too strong (disk above MAX), the V094 regulator valve is installed between the hose and the skimmer inlet:

1. Turn off the pump.
2. Connect the V093C cone adapter to the bottom of the V094 regulator valve.
3. Insert the cone adapter into the skimmer suction inlet. The cone creates a seal and channels suction to the cleaner hose.
4. Connect the leader hose to the top of the V094 regulator valve.
5. Turn on the pump and check the Flow Gauge.
6. Turn the V094 adjustment ring until the disk sits midway between MIN and MAX.
7. For very large pumps where a single V094 provides insufficient restriction, two regulator valves can be stacked: connect the second regulator to the outlet of the first.

Dedicated Suction Line Installation: Adjusting Flow

A dedicated suction line is a cleaner-only port plumbed directly from the pool to the equipment pad. This is the preferred installation for performance and safety.

1. The dedicated line must be at least 1.5 inches in diameter. Smaller pipe restricts flow below usable levels.
2. A Vac-Lock safety device must be installed at the pool end of the dedicated line. This prevents entrapment if the cleaner head is removed while the pump is running.
3. Connect the leader hose directly to the Vac-Lock fitting — no cone adapter is needed on a dedicated line.
4. Adjust suction using the dedicated line valve at the equipment pad. Do not use a regulator valve on a dedicated line — use the in-line valve instead.
5. Check the Flow Gauge after adjustment. The dedicated line valve allows precise control and can handle a full range of pump sizes.

What the Flow Gauge Tells You

• Disk at or above MAX: Excessive suction. The cleaner will move too fast, flip, or ride up walls aggressively. Install or adjust the regulator valve to reduce flow. Do not operate the cleaner above MAX — excessive suction causes premature wear on shoes, wings, and turbine bearings.
• Disk between MIN and MAX: Correct flow. The exact midpoint is ideal; anywhere in range is acceptable.
• Disk at or below MIN: Insufficient suction. The cleaner will move slowly or not at all. Clean the filter, empty baskets, verify valve positions, and check pool water level. The regulator valve cannot fix this — it can only reduce flow, not increase it.
• Disk oscillating up and down: Air is being ingested somewhere in the suction line. Check for a loose hose connection, a worn gasket at the skimmer, or a suction-side air leak at the pump or plumbing. Air ingestion dramatically reduces effective suction and causes erratic cleaner behavior.

Operational Tips After Setup

• Disconnect the cleaner from the suction source before backwashing. Backwashing reverses flow and can suck the hose into the plumbing.
• Re-check the Flow Gauge periodically — especially after filter cleaning. A newly cleaned filter may allow more flow than before, pushing the disk above MAX.
• Never operate the cleaner with the pump below minimum operating speed on variable speed installations. Set the pump speed such that the Flow Gauge disk is in range.
• All return fittings should point downward. Returns that aim horizontally or upward create surface current that interferes with hose position and cleaner navigation.

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