How does a plumbing ball valve work?
A ball valve is a shut off valve that controls the flow of a liquid or gas by means of a rotary ball having a bore. By rotating the ball a quarter turn (90 degrees) around its axis, the medium can flow through or is blocked. In special versions, ball valves are also used as a control valve.
Can a ball valve reduce water pressure?
A ball valve only controls flow and not pressure. A ball valve can be used to limit the pressure after water is flowing.
What kind of water shut off valve is a ball valve?
Ball Valve A ball valve is normally a rather large metal valve usually featuring a lever handle. It is designed for quick turn-off since the valve opens and closes full with a short 1/4 turn of the lever handle. This is the type of valve often seen at the main water shut-off for the home.
Why do you need a ball valve for a water main?
Therefore able to withstand much greater water pressure. Because there is no ‘stem’ inside a ball valve, raising or lowering a gate (such as in a gate type valve), it is very unlikely to ever fail or break. Most NYC water main contractors prefer to use a ball valve as the main control valve on all domestic water service lines up to 2″ in diameter.
How can you tell if a ball valve is open or closed?
You can tell by the handle placement whether the ball valve is opened or closed: when open, the handle lies flat, in alignment with the flow, and when closed, the handle is perpendicular to the flow. Gate valves tend to be less expensive than ball valves, but are more susceptible to corrosion.
How many turns does a brass ball valve need?
On the other hand, misuse routinely results in valve failure and an unexpected loss of water service. To open or close a brass ball valve on a water line requires only a quarter of one turn. Many times a brass ball valve is damaged by a person attempting to over-turn the valve. If it turns more than 1/4 of a turn you have broken the valve!
Can a ball valve be used on a water main?
The gate seats inside the valve body to make a water tight seal. Ball type valves are legal for domestic water supply in NYC, but they must be full port opening (the opening water flows through must be the full size indicated on the valve body).
When do you need to operate a brass ball valve?
When you need to operate a brass ball valve on a water main service line, observing a few simple rules can be very helpful. Opening and closing a brass ball valve correctly can prevent damage and unnecessary repair work. In addition, operating it correctly will add years of useful service life to this very dependable device.
Is it legal to use a ball valve in NYC?
Ball type valves are legal for domestic water supply in NYC, but they must be full port opening (the opening water flows through must be the full size indicated on the valve body). Ball valves are fully closed or opened by a 1/4 turn of the valve handle.
How is a butterfly valve like a ball valve?
Butterfly valves are designed with a disc inside of it that is the same size as the pipe. And like the ball valve, the disc turns inside the valve opening and closing off the flow of water. Also like the ball valve, the disc is attatched to a handle or lever.
