Keterangan
Linear-motion flow control and isolation valve
Katup Bola Baja Tahan Karat
A stainless steel globe valve for controlled throttling and positive isolation, with body pattern, trim contour, materials and operator selected for the process duty.
What is a stainless steel globe valve?
A globe valve moves a disc or plug perpendicular to a stationary seat. Its internal flow path creates more pressure drop than a gate valve, but the arrangement provides better flow regulation and more controlled shutoff during frequent operation.
Standard T-pattern bodies are common for general process service. Y-pattern and angle-pattern designs can be selected when lower pressure loss, drainage or piping layout is important. Throttling performance depends on plug contour, seat design, travel, actuator and process conditions.
Globe valve specifications
| Produk | Stainless steel globe valve |
|---|---|
| Pola tubuh | T-pattern; Y-pattern or angle pattern as separate design options |
| Konstruksi | Bolted bonnet; pressure seal or bellows seal only when separately designed and ordered |
| Anggota penutupan | Plug, composition disc or engineered regulating contour according to duty |
| Bahan tubuh | ASTM A351 CF8/CF8M/CF3/CF3M; dupleks atau paduan nikel berdasarkan spesifikasi |
| Rapikan dan tempat duduk | Stainless/alloy trim with renewable, integral or hardfaced seats as ordered |
| Peringkat tekanan | Peringkat Kelas ASME atau PN diverifikasi berdasarkan material dan suhu |
| Akhiri koneksi | Federasi Rusia, RTJ atau butt-weld sesuai desain |
| Flow direction | Specified by valve design and operating duty |
| Operasi | roda tangan, kotak roda gigi, aktuator pneumatik atau listrik |
| Dokumentasi | Catatan materi, laporan uji tekanan, flow/GA data and inspection dossier as ordered |
Tabel ini menjelaskan opsi pasokan rekayasa yang umum, bukan kisaran stok universal. Ukuran akhir, peringkat tekanan-suhu, memangkas, kursi, operator dan koneksi akhir harus dikonfirmasi terhadap spesifikasi pembelian dan edisi kode yang berlaku.
Pilihan bahan stainless steel dan paduan
| Keluarga materi | Penunjukan pemeran umum | Dasar seleksi yang khas |
|---|---|---|
| Baja tahan karat austenitik | ASTM A351 CF8, CF8M, CF3 dan CF3M | Ketahanan korosi secara umum; CF8M/CF3M menambahkan molibdenum untuk meningkatkan ketahanan terhadap klorida. |
| Baja tahan karat dupleks | ASTM A995/A890 4A dan terkait 2205 nilai | Kekuatan yang lebih tinggi dan ketahanan korosi tegangan klorida yang lebih baik bila ditentukan dengan benar. |
| Baja tahan karat super dupleks | ASTM A995/A890 5A atau 6A | Air laut, layanan lepas pantai dan klorida tinggi tunduk pada kontrol suhu dan fabrikasi. |
| Paduan nikel | ASTM A494 nilai yang cocok dengan C276, Paduan 20, Monel atau kimia terurut lainnya | Dipilih dari proses kimia yang sebenarnya, konsentrasi, data suhu dan kontaminasi. |
Desain, pengujian dan kepatuhan proyek
API 623
Dasar desain umum untuk katup globe baja dengan ujung bergelang atau las butt. State the required edition and valve pattern.
ASME B16.34
Memberikan tekanan-suhu, bahan, desain, penyelidikan, persyaratan pengujian dan penandaan dalam ruang lingkup.
API 598
Common basis for shell, backseat and closure pressure tests when specified.
IEC 60534
Relevant to engineered control-valve sizing and performance when the product is configured as a control valve, not automatically to every manual globe valve.
Standar diberikan hanya bila dinyatakan dalam kutipan dan pesanan pembelian. Aman dari kebakaran, emisi buronan, layanan asam, Persyaratan kriogenik dan PED memerlukan desain yang pasti dan kualifikasi atau dokumentasi pendukung.
Aplikasi yang umum
| Industri | Tugas khas | Fokus seleksi |
|---|---|---|
| Pemrosesan kimia | Dosing, bypass and process regulation | Trim compatibility, leakage and controllability |
| Pembangkit listrik | Feedwater, drains and auxiliary services | Penurunan tekanan, cavitation and temperature rating |
| Petrokimia | Unit isolation and controlled letdown | Emissions packing, erosion and fire-safe philosophy |
| Pengolahan air | Flow regulation and chemical injection | Seat material, operating frequency and actuator sizing |
Contoh aplikasi bukan merupakan persetujuan layanan. Pengguna akhir atau insinyur material perpipaan harus memverifikasi kompatibilitas korosi, batas tekanan-suhu, kelas emisi, frekuensi pengoperasian dan peraturan yang berlaku.
Dokumentasi inspeksi dan pasokan
EN 10204 3.1 catatan material dan ketertelusuran nomor panas saat dipesan.
Pengujian cangkang dan penutup/dudukan sesuai standar yang dipesan dengan kriteria penerimaan yang terdokumentasi.
Identifikasi material positif dan ruang lingkup PT/RT/UT diatur bila ditentukan dalam rencana pemeriksaan.
Ukuran, menandai, operasi, pelapisan/kebersihan, pengepakan dan berkas dokumen diperiksa sebelum pengiriman.
Daftar periksa RFQ
- Design standard and body pattern
- Nominal size and pressure class or PN
- Tubuh, bonnet, tangkai, plug/disc, kursi, packing and bolting materials
- Isolation or throttling duty
- Required flow coefficient or process flow data when applicable
- End connection and facing
- Cairan, design pressure, temperature and differential pressure
- Actuation, emissions, NACE dan persyaratan inspeksi
Pertanyaan yang sering diajukan
Bisakah katup globe digunakan untuk pelambatan?
Ya. Globe valves are commonly selected for regulated flow, but plug contour, allowable pressure drop, kavitasi, kebisingan, velocity and actuator requirements must be checked for the actual duty.
What is the difference between a globe valve and a gate valve?
A globe valve uses a disc moving onto a seat and is suitable for regulation, but has higher pressure drop. A gate valve provides a straighter flow path and is mainly used for full-open or full-closed isolation.
Which flow direction should be used?
Flow direction depends on the valve pattern, disc design, tekanan, temperature and operating objective. Follow the approved drawing and body flow arrow rather than applying one rule to every globe valve.
When is a bellows seal required?
A bellows seal may be selected where stem leakage must be minimized for hazardous, toxic, high-purity or vacuum service. Bellows material, cycle life and secondary packing arrangement must be specified.
Can hardfaced seating be supplied?
Ya, when required for temperature, erosion, wear or leakage performance. The hardfacing alloy and deposition procedure must remain compatible with the body, trim and service fluid.
Request a stainless steel globe valve quotation
Send the valve pattern, ukuran, kelas, bahan, throttling duty, process conditions, ends and operator requirements.
