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Hydro-S

Hydro-S butterfly valves and layflat hose for pool pipework

Here you will find the Hydro-S range as it is stocked at PoolParthub.com: lever-operated PVC-U butterfly valves in grey, built to the Type 7500 pattern with flange connection and a PN10 rating, plus flat layflat hose in 38 mm for backwash and drain work. Between them they cover the two jobs that come up most often on a larger pool installation — isolating a section of pipework so it can be worked on, and getting waste water away from the filter without laying permanent pipe.

The valves run from DN50 up to DN200, which spans everything from a modest commercial filter line to the main suction and return manifolds on a public pool. Because they are flanged rather than solvent-socketed, a valve can be removed from the line without cutting pipe, which matters when a wafer body eventually needs replacing after years of chlorinated water and UV exposure.

What the Hydro-S range covers

  • Butterfly valves DN50 to DN100: compact sizes for filter bypass, heat exchanger isolation and branch lines, including DN50, DN65 (listed with 75 mm flange), DN80 and DN100 (listed with 110 mm flange).
  • Butterfly valves DN140 to DN200: larger bodies for main circulation pipework, including DN140, DN150 (160 mm) and DN200 (225 mm) versions.
  • Type 7500 pattern: most of the valves are described as Type 7500, a grey PVC-U body with a hand lever and a PN10 / 10 bar rating.
  • PVC layflat hose 38 mm: a light 3 bar version on a 15 m length and a heavier 6 bar version on a 25 m roll, both in blue.

Choosing the right butterfly valve size

Start from the pipework, not from the pump. A butterfly valve is specified by its nominal diameter (DN) and by the flange standard it bolts to, so the figure to establish first is the DN of the flanges or stub flanges already on the line. Several of the listings quote both values — for example DN150 with 160 mm, DN100 with 110 mm and DN200 with 225 mm — because PVC pressure pipe is normally named by its outside diameter while the valve is named by its nominal bore. Measuring the outside diameter of the pipe with a tape or callipers is usually the quickest way to confirm which of the two numbers you are looking at.

Then check the bolt circle and the number of bolt holes on the existing flanges before ordering, and confirm that the system pressure stays within the PN10 rating of the valve. Leave room around the spindle for the lever to swing a full quarter turn; in a tight plant room this often decides which side of the pipe the valve is fitted on. Where a valve sits between two fixed flanges, remember that a wafer-pattern body is clamped in place by the bolts rather than bolted on one face only, so both flanges need to be in reasonable condition.

Layflat hose for backwash and draining

Flat hose rolls up to almost nothing when empty and fills out under pressure, which makes it the practical choice for running backwash water from a sand filter to a gully, drain or soakaway and then stowing it again. The 38 mm diameter suits the waste outlet of most multiport and side-mount valves on domestic and light commercial filters.

The difference between the two versions is duty. The 3 bar light hose in 15 m is intended for low-pressure, occasional draining where the run is short. The 6 bar hose in 25 m is heavier walled and better suited to longer runs, rougher ground and more frequent use. In both cases, keep the run as straight as possible — kinks in a flat hose choke the flow far more than they would in a rigid pipe — and secure the hose at the filter end with a proper clip so it cannot whip off when the pump starts.

Fitting, maintenance and what wears out

  • Seat and liner: the elastomer seat is the part that eventually hardens or takes a set, usually showing itself as a slow weep past a closed disc.
  • Spindle seals: check for damp around the stem after the valve has been left under pressure.
  • Flange gaskets and bolts: replace gaskets whenever a valve is taken out, and tighten bolts evenly in a cross pattern so the PVC body is not distorted.
  • Exercise the valve: a valve left in one position for a whole season is harder to shift; opening and closing it a few times a year keeps the seat free.

Hydro-S at PoolParthub.com

Here we list the Hydro-S items that are asked for most in pool plant rooms: the grey PVC-U butterfly valves across the DN50 to DN200 sizes, and the two 38 mm layflat hoses. Each listing carries its article number — such as 7014378 through 7014386 for the valves — so a replacement can be matched to an existing installation without guesswork.

If you are unsure which nominal diameter you need, note the outside diameter of the pipe and the flange details from the valve already fitted, and compare them against the figures given in the product titles. That single check prevents nearly all of the sizing errors on flanged pool pipework.