Automatic Backwash Valve, Starway exploded view & spare parts

Automatic Backwash Valve, Starway — exploded view & spare parts

This page covers the complete exploded-view diagram and bill of materials for the Starway Automatic Backwash Valve in the D.63 pipe size, factory reference 7038736. The Starway is a motorised 5-way valve designed for the automatic reverse flushing of sand filters. It automates the backwashing cycle of swimming pool filters, managing both the service/filtration phase and the backwash phase. The valve is equipped with an electric actuator with a closing function that always returns it to the filter position in the event of a power cut. Use the diagram and the numbered parts list below to identify the exact component you need and match it to its SKU in a matter of minutes.

Comment utiliser le schéma numéroté pour trouver votre pièce

Every numbered call-out on the diagram corresponds directly to a row in the bill of materials table below it — locate the area of the valve that concerns you (motor end, body, seals, fasteners) and then read off the position number closest to the component you need. Once you have the position number, find the matching row in the parts list and note its SKU; that SKU is what you add to your basket. Bear in mind that some position numbers appear more than once on the diagram because the same part is used in multiple locations — fasteners such as the M6 hex nut at position 7 and the M6 washer at position 13 are a typical example, fitted at several points around the valve body. Always count all instances before deciding on the quantity you require. Similarly, if a position number carries a letter suffix (for example 10a or 10b), that suffix distinguishes between variants that may differ in size, thread pitch, or material, so confirm the suffix before ordering. Where a row in the parts list shows no SKU, the component is not currently sold individually through this listing; if you need clarification on availability, please contact us directly. The position numbers in this diagram run from 1 through to 20 and cover every sub-assembly, from the main ABS tee body down to individual O-rings and fasteners.

Main replaceable assemblies on the Starway D.63 Automatic Backwash Valve

The valve body itself is formed by the ABS printed tee at position 1 (SKU 7039420) and the ABS tee joint at position 17 (SKU 7039422), which together form the main hydraulic passages through which pool water and backwash water are routed. The lower ABS valve cap at position 20 (SKU 7039425) closes the bottom of the valve body and is one of the more frequently disturbed components during a strip-down. The internal piston relies on the piston seal at position 11 (SKU 7039421) to maintain separation between the filtration and backwash ports; this is typically the first seal to show wear in service. Two Viton O-rings complete the sealing circuit: the O-ring at position 12 (6.07 × 1.78 mm, SKU 7039416) and the larger O-ring at position 18 (66.26 × 3.53 mm, SKU 7039423), with a further Viton O-ring at position 19 (46.04 × 3.53 mm, SKU 7039424) sealing the lower cap interface. The valve spindle and tie-rod components are manufactured in AISI 316L stainless steel — represented here by the central tie rod at position 2 and the lower pin at position 3, both of which resist the corrosive pool-water environment over the long term. The motor drive train is served by the worm screw at position 16 (SKU 7039419), which transmits rotary motion from the actuator to the valve mechanism. The electronic control board at position 14 (SKU 7039417) governs the automated switching sequence, operating at 24 V DC. The engine closing cover at position 8 (SKU 7039412) protects the motor and board assembly from moisture ingress and is shared with the D.50 variant of the Starway range.

Choosing between variants and pack sizes

The Starway valve family is available in both D.50 and D.63 pipe diameters; the parts listed on this page are specific to the D.63 / centre-distance 140 mm variant (factory reference 7038736), so confirm your pipe size before ordering body components, caps, and seals. Several fasteners in this BOM — notably the closure tie rod at position 5, the washers at positions 6 and 13, and the nuts at positions 7 and 10 — are standard metric hardware (M6 thread); if you are sourcing these locally, verify both thread pitch and material grade, as the originals are AISI 304 or AISI 316L stainless steel to prevent corrosion. The Viton O-rings at positions 12, 18, and 19 each carry distinct cross-section and inside-diameter dimensions, so always cross-reference the dimension printed in the parts description (for example 66.26 × 3.53 mm for position 18 versus 46.04 × 3.53 mm for position 19) rather than relying on visual size alone — fitting an O-ring of the wrong cross-section will result in an immediate seal failure under pressure. Where a BOM row carries no SKU, the part is a semi-finished or structural component (such as the semi-finished top cap at position 4) that is not sold separately; if you are unsure whether a non-stocked item is the root cause of your fault, our technical team can advise on the correct repair path.