Seat SS304 Lift Check Valve Anti-Korosi & Zero Leakage Class a

Kata Kunci Utama: seat SS304 lift check valve, SS304 seat material, stainless steel seat anti korosi Kata Kunci Turunan: SS304 vs brass seat, metal seat vs SS304, surface finish seat valve, zero leakage seat, seat valve tahan korosi

Seat SS304 Austenitic Stainless untuk Zero Leakage

Seat SS304 adalah sealing surface di lift check valve yang contact dengan disc untuk prevent backflow. SS304 (austenitic stainless 18% Cr, 8% Ni) memberikan: (1) corrosion resistance (passive layer), (2) smooth surface (Ra 0.8μm achievable), (3) zero leakage (Class A per API 598). Cocok untuk water, mild chemicals, condensate — tahan korosi, long lifespan 7-12 years.

Properties Table SS304 Seat Material

Key advantage: Passive layer (Cr₂O₃) = self-healing corrosion protection.

SS304 vs Brass vs CF8 vs Metal Seat Comparison

Buyer sering bertanya: "SS304, brass, CF8, atau metal seat?" Berikut comparison:

Kapan Pilih SS304 Seat?

Kapan Pilih Alternatives?

Brass: ❌ NOT recommended (korosi risk — dezincification in water)

CF8: ✅ High-temp cast applications (body & seat sama-sama cast)

Metal Seat (Stellite): ✅ Steam (>200°C), high-cycle (wear critical), severe service — tapi 3-5× cost vs SS304

Kesimpulan: For water & mild chemicals, SS304 = optimal (corrosion resistant + economical). For steam >200°C atau severe wear, upgrade ke metal seat.

Surface Finish Critical untuk Zero Leakage

Leakage terjadi di micro-gaps antara disc-seat contact surface.

Surface Finish Specs

SS304 seat typically: Ra 0.8μm (grinding) = Class A zero leakage.

Metal seat (Stellite): Ra 0.4μm (lapping) = Class A+ absolute zero.

Leakage Rate Data

Per API 598 testing (water @ room temp, 1.1× rated pressure):

SS304 = Class A zero leakage — adequate untuk 90% applications.

Corrosion Resistance Passive Layer Protection

Mechanism

SS304 contains 18% Chromium → reacts dengan oxygen:

4Cr + 3O₂ → 2Cr₂O₃ (passive layer)

Passive layer (Cr₂O₃ film, ~2-5 nanometers):

• ✅ Self-healing (re-forms if scratched)

• ✅ Prevent corrosion (barrier layer)

• ✅ Stable in water & mild chemicals

Corrosion Resistance Table

SS304 limitation: Chloride >200 ppm → pitting risk. For seawater, use SS316 (add 2% Mo).

Lifespan SS304 Seat vs Alternatives

Example application: Pump discharge check valve DN 50, 10 bar, clean water, 8 hours/day.

Seat Material Failure Mode Lifespan Replacement Cost (10 years) SS304 Gradual wear 7-12 years 1× = Rp 800,000 Brass Corrosion + wear 3-5 years 3× = Rp 2,400,000 CF8 Gradual wear 8-12 years 1× = Rp 1,000,000 Metal Seat Minimal wear 10-20 years 0-1× = Rp 3,000,000 (but expensive initial)

SS304 = best TCO untuk water/mild chem applications.

Aplikasi SS304 Seat Lift Check Valve

NOT recommended for:

• ❌ Seawater → use SS316

• ❌ High-chloride (>200 ppm) → use SS316

• ❌ Steam >200°C + high-cycle → use metal seat

• ❌ Slurry/abrasive → use metal seat (hard)

Troubleshooting SS304 Seat Issues

FAQ Pertanyaan Umum

Q: Apa itu seat SS304 dan kenapa penting untuk lift check valve?

A: Seat SS304 adalah sealing surface di valve yang contact dengan disc untuk prevent backflow. SS304 (austenitic stainless 18% Cr) punya: (1) corrosion resistance excellent untuk water/mild chem, (2) smooth surface (Ra 0.8μm) untuk zero leakage Class A, (3) lifespan 7-12 tahun. Seat adalah critical sealing point — material quality determine leak rate.

Q: SS304 atau brass untuk seat check valve?

A: SS304 adalah far superior. Brass punya dezincification problem (Zn loss dalam water) → korosi, leak, short life (3-5 years). SS304 = corrosion resistant, 7-12 years lifespan, zero leakage. For water systems, ALWAYS choose SS304 over brass — TCO lebih rendah.

Q: Berapa surface finish optimal seat SS304?

A: Ra 0.8μm (grinding) adalah optimal — achieve Class A zero visible leakage (API 598). Lebih halus (Ra 0.4μm lapping) = Class A+ tapi cost naik. Lebih kasar (Ra 1.6μm) = Class C minor leak. For industrial check valve, Ra 0.8μm = sweet spot (performance vs cost).

Q: Apakah SS304 seat cocok untuk steam?

A: Yes, cocok untuk saturated steam ≤200°C (SS304 stable hingga 400°C). Tapi untuk high-cycle steam atau superheated >200°C, metal seat (Stellite) lebih baik — harder (wear resistant), better at high-temp. SS304 = adequate for normal steam, metal seat = optimal for severe steam.

Q: Kenapa SS304 seat zero leakage?

A: Smooth surface (Ra 0.8μm) + elastic matching dengan disc (2Cr13 HRC 40-50) = tight contact, zero micro-gaps. Per API 598 testing, SS304 seat ground finish = 0 mL/h leakage (Class A). Brass seat (rougher surface) = 10-40 mL/h leak.

Q: Berapa lifespan seat SS304 vs metal seat?

A: SS304: 7-12 tahun (water/mild chem, normal cycle). Metal seat (Stellite): 10-20 tahun (high-cycle, high-temp, abrasive). For cost vs lifespan: SS304 = best TCO untuk 90% applications. Metal seat = worth it untuk severe service only (3-5× cost).

Konsultasi & Pembelian

Butuh lift check valve dengan seat SS304 untuk water atau mild chemical system?

📱 WhatsApp: +62 812-8530-8088

☎️ Telepon: +62 61 420-85666

📧 Email: sales@mitrasahabat.co.id

🌐 Website: www.mitrasahabat.co.id

📍 Lokasi: Komp. Makro Bisnis Center D-11, Medan Sunggal, Sumatera Utara

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Produk Lift Check Valve dengan Seat SS304

• CETO Lift Check Valve PN16 — disc 2Cr13 + seat SS304

• Body: Cast iron atau cast steel

• Seat: SS304 ground finish Ra 0.8μm

• Disc: 2Cr13 HRC 42-46

• Leakage: Class A zero visible per API 598

• Pressure: PN16, PN25, PN40

• Size: DN 15 – DN 100

• Application: Water, mild chemicals, condensate

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Keywords: seat SS304 lift check valve, SS304 seat material, stainless steel seat anti korosi, SS304 vs brass seat, metal seat vs SS304, surface finish seat valve, zero leakage seat, seat valve tahan korosi, austenitic stainless seat

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