Name: TANGGONG Ammonia Valve Series
Brand: TANGGONG VALVE GROUP
Availability: InStock
Rating: 4.8 (38 reviews)

Question 1

What materials are used for ammonia valves?

Accepted Answer

Ammonia valves require materials compatible with NH3 (ammonia) and its low-temperature liquid phase (-33°C for liquefied ammonia at atmospheric pressure). TANGGONG manufactures ammonia valves from: (1) LCB/LCC — low-temperature carbon steel for liquefied ammonia service down to -46°C; (2) CF8/CF8M (SS304/SS316) — austenitic stainless steel for corrosive ammonia solutions and gaseous ammonia; (3) WCB — carbon steel for gaseous ammonia above -29°C (with NACE compliance for trace impurities). All soft goods (seals, gaskets) are ammonia-compatible: PTFE, graphite, or specialized ammonia-resistant elastomers.

Question 2

Why do ammonia valves require low-temperature rated steel (LCB/LCC)?

Accepted Answer

Liquefied ammonia (NH3) has a boiling point of -33.34°C at atmospheric pressure. When liquefied ammonia expands through a valve or experiences pressure drop, it can cause severe local cooling (Joule-Thomson effect) down to -46°C. Standard carbon steel (WCB) undergoes ductile-to-brittle transition at approximately -29°C, risking catastrophic brittle fracture. LCB (low-temperature carbon steel, impact tested at -46°C) and LCC (low-temperature carbon steel, impact tested at -46°C) maintain ductility and toughness at these temperatures, preventing valve body rupture.

Question 3

What is the difference between an ammonia valve and a standard industrial valve?

Accepted Answer

Ammonia valves differ from standard valves in: (1) Body material — LCB/LCC low-temperature steel vs. WCB for standard valves; (2) Soft goods — ammonia-compatible seals (PTFE, graphite) vs. standard NBR/EPDM; (3) Design pressure/temperature — based on NH3 phase diagram (liquefied vs. gas); (4) Cleaning — ammonia valves require degreasing and ammonia-compatibility certification; (5) Testing — additional low-temperature operability test and ammonia leakage test; (6) Seat design — frequently renewable seat for easy maintenance in fertilizer plant service.

Question 4

Can TANGGONG supply ammonia valves for refrigeration systems?

Accepted Answer

Yes. TANGGONG manufactures ammonia valves specifically for industrial refrigeration systems using NH3 as refrigerant. These include: (1) Ammonia gate valves for main liquid ammonia lines; (2) Ammonia globe valves for refrigerant flow regulation and expansion control; (3) Ammonia check valves for compressor discharge and pump protection; (4) Ammonia safety relief valves for overpressure protection of receivers and condensers. All refrigeration-grade ammonia valves are supplied with LCB/LCC bodies and ammonia-compatible seals, certified for -46°C service.

Question 5

What are the testing requirements for ammonia valves?

Accepted Answer

TANGGONG ammonia valves are tested per: (1) Shell test — 1.5× pressure rating, helium or air soak test; (2) Seat leakage test — ISO 5208 Rate A (bubble-tight) or Rate B; (3) Low-temperature operability test — at -46°C with liquefied ammonia simulant; (4) Ammonia compatibility test — seal/gasket material immersion test in NH3; (5) Fire-safe test (for applicable designs) — API 607; (6) MTR (Material Test Report) — impact test results at -46°C for LCB/LCC. Third-party inspection (TUV, SGS, BV) is available on request.

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