This is perhaps the first line of defense in gas installations. As a safety, feature at the first sign that something is amiss shutting off the ball control valve or Fire safe and Meter Control Valve will render the gas appliance inoperable until the issue is sorted out. This gas-meter control valve is situated before the meter so that in the event that gas flow is needed to be shut down every appliance downstream of the meter is switched off.
Most if not all ball valves are manufactured out of brass, which is a zinc alloy. The chief characteristic of brass is that the metal is non-sparking. Even if another metal strikes the ball valve, no spark will occur, as brass is a soft and ductile material. Being friction less accidental sparks are eliminated. LP gas or natural gas is flammable materials. An accidental rubbing of the ring (worn by both female and male users) on brass will have zero effect of sparking.
Ball valves and fire safe meter control valves are designed and manufactured to British Gas specification T/SP/V7 Part 3 and complying withBS 1552:1995. They have a wide temperature range of operation that can function between minus 20 degrees centigrade to 60 degrees centigrade. Domestic gas installations the fire control valves are rated for 0.5 bars.
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