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.
katup bola yang tahan lama, berkinerja baik setelah banyak siklus, dan dapat diandalkan, menutup aman bahkan setelah lama tidak digunakan. Kualitas ini membuat mereka pilihan yang sangat baik untuk penutup dan kontrol aplikasi, di mana mereka sering lebih suka gerbang dan katup dunia, tetapi mereka tidak memiliki kendali mereka baik-baik saja di aplikasi throttling.
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.
FUNGSI DARI katup ADALAH:
Berhenti dan mulai aliran
Mengurangi atau meningkatkan aliran
Mengendalikan arah aliran
Mengatur aliran atau proses tekanan
Meringankan sistem pipa tekanan tertentu
Klasifikasi Katup
Berikut ini adalah beberapa klasifikasi katup umum digunakan, berdasarkan gerak mekanik:
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 Gerak Valves. Ketika anggota katup-penutupan perjalanan sepanjang jalur angular atau melingkar, seperti dalam kupu-kupu, bola, steker, eccentric- dan Swing Check Valves, katup disebut katup gerakan berputar.
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.
KLASIFIKASI katup BERDASARKAN MOTION
| Jenis katup | linear Gerak | Rotary Gerak | Quarter Hidupkan |
| Gerbang | IYA NIH | TIDAK | TIDAK |
| bola | IYA NIH | TIDAK | TIDAK |
| Steker | TIDAK | IYA NIH | IYA NIH |
| Bola | TIDAK | IYA NIH | IYA NIH |
| kupu-kupu | TIDAK | IYA NIH | IYA NIH |
| ayunan Periksa | TIDAK | IYA NIH | TIDAK |
| spiral | IYA NIH | TIDAK | TIDAK |
| Mencubit | IYA NIH | TIDAK | TIDAK |
| Keamanan | IYA NIH | TIDAK | TIDAK |
| Bantuan | IYA NIH | TIDAK | TIDAK |
| Jenis katup | linear Gerak | Rotary Gerak | Quarter Hidupkan |
Penilaian kelas
tekanan-suhu katup yang ditunjuk oleh nomor kelas. ASME B16.34, Valves-Flange, Threaded, dan Welding Akhir merupakan salah satu standar katup yang paling banyak digunakan. Ini mendefinisikan tiga jenis kelas: standar, khusus, dan terbatas. ASME B16.34 meliputi Kelas 150, 300, 400, 600, 900, 1500, 2500, dan 4500 katup.
Minyak light, Black Lukisan
