Encyklopedia jachtów
Seacocks (through-hull valves)
Seacocks and through-hull valves on cruising yachts: seizure risk, bonding, survey checks and Nordic winter haul-out practice.
Co to jest
Seacocks are the valves on through-hull openings below the waterline (engine intakes, sinks, heads, transducers). FairHelm treats them as critical safety hardware: a seized valve is both a survey finding and an operational risk if you cannot stop flooding.
Survey language
Surveyors check operation, corrosion, hose clamps, and whether hoses are reinforced marine grade below the waterline. Bronze and composite bodies age differently. Bonding wires and sacrificial anodes belong in the same conversation as metal fittings in salt or brackish Baltic water.
Ownership practice
Cycle seacocks regularly in commission. On winter haul-out, confirm valves are accessible and not frozen with silt. Replace hoses on age, not only on visible cracks. FairHelm survey checklists put seacock operation on the first haul-out walkaround, not as an afterthought after engine hours.
Buying implications
A "recent refit" that ignored below-waterline valves is incomplete. Budget for seized bronze replacements on 1980s–90s Nordic hulls when operation is stiff. Do not accept "they all stick a bit" without a surveyor turning the handles.
Najczęściej zadawane pytania
Q: Are plastic seacocks unsafe?
A: Approved marine composites can be fine. Unapproved plumbing fittings below the waterline are not.
Q: Must every through-hull have a valve?
A: Critical openings should. Transducer fittings follow surveyor and class practice for the installation.
Q: Can I leave seacocks open ashore?
A: Follow yard winterisation practice. Accessibility and freeze risk matter more than a universal rule.