For liquid nitrogen, LNG, and ethylene services at -196°C, standard carbon steel (WCB) and low‑temperature steel (LCB/LCC) become brittle. Austenitic stainless steel (304/316L) is mandatory.The main gate valves product names of China gate Valve Network include:,High Temperature & pressure Power Station Gate Valve,Inside Screw Non-rising Stem Wedge Gate Valve,Insulation Jacket Gate Valve,Lined Gate Valve,MZ44W Rising Stem Gas Quick Open&close ParallelMZ48W Manual Non-rising Stem City Gas Quick Gate Valve,Manual Knife-shaped Gate Valve

Key Design Features for -196°C

Extended bonnet – Isolates packing from cold media, prevents freezing. Height ≥200mm for DN50.

Drip plate – Stops condensate from dripping onto insulation.

Stellite hardfaced seat – Gall‑resistant, retains hardness at cryogenic temperatures.

Pressure relief hole – At body bottom to prevent trapped liquid vaporisation from locking the valve.

2026 Direct Factory Price (RMB, incl. tax)

Material Size Pressure Connection Price (RMB)

SS304 DN50 PN16 Flanged 2,800–3,600

SS304 DN80 Class 150 Flanged 4,500–5,800

SS316L DN50 PN16 Flanged 3,600–4,500

SS316L DN100 Class 300 Flanged 8,500–11,000

Forged F304 DN50 150LB Butt‑weld 4,200–5,500

Bulk orders (3+ pcs) save 10–15%. Extended bonnet customisation, NACE, or class society certification add 20–30%.

Selection Parameters

Size: DN15–DN600, DN50/DN80 common for liquid nitrogen branches.

Pressure: PN16–PN63 or Class 150–Class 600 (LNG saturated vapour pressure usually ≤1.6MPa).

Material: SS304 (CF8) for general cryogenic; SS316L (CF3M) for chloride or more corrosive services. Do not use LCB (only -46°C).

End connection: Flanged (RF/MFM) or butt‑weld (preferred for -196°C).

Bonnet height: Must exceed insulation thickness (typically 200–300mm).

Installation Tips

Pre‑cool: Purge with dry nitrogen, then slowly introduce liquid nitrogen to avoid thermal shock.

Insulation: Cover body and below extended bonnet, but never cover packing or handwheel.

Bolting: Use SS304/SS316 bolts with anti‑seize.

Operation: Packing resistance increases at low temperature – operate slowly, never use a cheater bar.

Why Buy Direct from Factory

Full material traceability with -196°C impact test report.

Custom bonnet height to match site insulation.

Shorter lead time (15–25 days).

Free technical support.

Bottom Line

For -196°C liquid nitrogen service, choose austenitic stainless steel + extended bonnet + Stellite seat. DN50 direct factory price: RMB 2,800–4,500. Proper selection ensures 20+ years of trouble‑free cryogenic service.

SEO Keywords: -196℃ cryogenic gate valve, liquid nitrogen valve direct price, extended bonnet gate valve, stainless steel cryogenic valve, LNG valve factory

Do you still need to know or purchase the following gate valve products: