Marine valves in Dubai cover seacocks, ball and gate valves, sea strainers, skin fittings, hose tails and manifolds in DZR bronze, stainless and composite. Valves are safety-critical below the waterline and are usually renewed at haul-out. Specify size, thread standard, material and pressure rating when requesting a quote.
There is no fixed interval, but they should be exercised at least twice a year and inspected at every haul-out. Any valve that is stiff, weeping, pink-tinged (dezincified) or won't fully close should be replaced immediately.
No. Standard brass dezincifies in sea water and can fail without warning. Use DZR bronze or an approved composite seacock designed for below-waterline marine service.
They are different standards with different taper and pitch. They can start to engage and then leak or crack under load. Confirm which standard your existing fittings use before ordering.
Approved composite seacocks are corrosion-proof and widely accepted, which is an advantage in Gulf conditions. They must be correctly supported and torqued, and not exposed to high heat. Both are valid choices when properly installed.
Below-waterline valves, yes — the yacht must be out of the water or the hull opening plugged by a diver. Above-waterline valves can be changed alongside.
For engine, generator and AC inlets, yes. Gulf waters carry sediment, weed and plastic debris, and a strainer is far cheaper than an impeller failure or a blocked heat exchanger.