A ball valve is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball to control flow through it. It is open when the ball's hole is in line with the flow and closed when it is pivoted 90-degrees by the valve handle.The handle lies flat in alignment with the flow when open, and is perpendicular to it when closed, making for easy visual confirmation of the valve's status.
Ball valves ay matibay, mahusay na gumaganap matapos ang maraming mga cycles, at maaasahang, pagsasara nang ligtas kahit na matapos matagal na panahon ng hindi paggamit. Ang mga katangian gawin itong isang mahusay na pagpipilian para sa shutoff at kontrol ng mga aplikasyon, kung saan sila ay madalas ginustong sa pintuan at globo Valve, ngunit kakulangan nila ang kanilang mga pinong kontrol sa throttling aplikasyon.
The ball valve's ease of operation, repair, and versatility lend it to extensive industrial use, supporting pressures up to 1,000 bar (100 MPa; 15,000 psi) and temperatures up to 752 °F (400 °C), depending on design and materials used. Sizes typically range from 0.2 to 48 inches (5.1 to 1,219.2 mm). Valve bodies are made of metal, plastic, or metal with a ceramic; floating balls are often chrome plated for durability. One disadvantage of a ball valve is that they trap water in the center cavity while in the closed position. In the event of a freeze, the sides can crack due to expansion of ice forming. Some means of insulation or heat tape in this situation will usually prevent damage. Another option for cold climates is the "freeze tolerant ball valve". This style of ball valve incorporates a freeze plug in the side so in the event of a freeze up, the freeze plug ruptures (acts as a sacrificial disk), thus making for an easy repair. Now instead of replacing the whole valve, just screw in a new freeze plug.
Mga function MULA VALVES ARE:
Paghinto at pagsisimula ng daloy
Bawasan o dagdagan ang isang daloy
Pagkontrol sa direksyon ng daloy
Ipinaguutos ng isang daloy o presyon ng proseso
Mapawi ang isang pipe sistema ng isang tiyak na presyon
Pag-uuri ng mga Valve
Ang mga sumusunod ay ilan sa mga karaniwang ginagamit na balbula pag-uuri, batay sa makina na kilos:
Linear Motion Valves. The valves in which the closure member, as in gate, globe, diaphragm, pinch, and lift Check Valves, moves in a straight line to allow, stop, or throttle the flow.
Rotary Motion Valve. Kapag ang balbula-pagsasara miyembro naglalakbay sa kahabaan ng isang angular o bilog na daan, tulad ng sa paru-paro, bola, plug, eccentric- at indayog Check Valve, ang Valve ay tinatawag na rotary valves paggalaw.
Quarter Turn Valves. Some rotary motion valves require approximately a quarter turn, 0 through 90°, motion of the stem to go to fully open from a fully closed position or vice versa.
Pag-uuri ng VALVES BATAY SA MOTION
| Uri ng Valve | Linear motion | Rotary Motion | quarter Turn |
| gate | OO | HINDI | HINDI |
| globo | OO | HINDI | HINDI |
| plug | HINDI | OO | OO |
| bola | HINDI | OO | OO |
| paruparo | HINDI | OO | OO |
| swing Check | HINDI | OO | HINDI |
| dayapragm | OO | HINDI | HINDI |
| kurutin | OO | HINDI | HINDI |
| kaligtasan | OO | HINDI | HINDI |
| kaluwagan | OO | HINDI | HINDI |
| Uri ng Valve | Linear motion | Rotary Motion | quarter Turn |
klase Ratings
Presyon-temperatura rating ng valves ay itinalaga ng mga numero ng klase. ASME B16.34, Valves-Flange, may sinulid, at Welding End ay isa sa mga pinaka-tinatanggap na ginagamit na pamantayan balbula. Ito ay tumutukoy sa tatlong mga uri ng mga klase: standard, espesyal na, at limitado. ASME B16.34 sumasaklaw Class 150, 300, 400, 600, 900, 1500, 2500, at 4500 valves.
Light Oil, Itim Painting
