By Application · 06
Cryogenic, Vacuum and Seawater Valves for Desalination and LNG
Two duties share this page because they share the same problem — a line that must stay tight where the medium or the temperature is hostile. Cryogenic gate and globe valves use an extended bonnet to keep the stem packing at ambient temperature down to −196 °C; a vacuum isolation gate valve uses double packing with sealing-water injection to keep air out of a condenser; and the seawater side needs forged and lined bodies that do not pit in brine. Feed pumps for the RO train are on the same page.
All 11 SKUs for this application
Materials & standards
What each series is cast or lined in, and the standards and data its dimensions come from.
Cryogenic Gate & Globe
Read from Cryogenic Gate Valve, Extended Bonnet — NPS 1/2" – 8" · Class 150 / 300 · −46 °C to −196 °C
| Body / Bonnet | ASTM A352 LF2, LF3, or CF8M |
|---|---|
| Disc | Solid wedge, cryogenic-treated |
| Seat | Integral or welded seat rings, anti-extrusion |
| Packing | Graphite or PTFE, low-temperature |
| Cleaning | Degreased for oxygen service on request |
Standards / data basis: ASME B16.34 / BS 6364 · BS 6364
Vacuum & Condenser Isolation
Read from Vacuum Isolation Gate Valve (NKZ41H) — DN50 – DN600 · PN10 / PN16 · double packing with sealing water
| Body / Bonnet | WCB cast steel |
|---|---|
| Wedge | Flexible wedge, 13Cr faced |
| Seat | 13Cr overlay |
| Gasket | Spiral wound, graphite filled |
| Packing | Graphite, two rings with water seal between |
Standards / data basis: GB/T 12234 / ASME B16.34
High-Pressure Forged Valves
Read from API Flange Gate Valve, Class 1500 — NPS 1/2" – 4" · Class 1500 · API 602 / ASME B16.34
| Body / Bonnet | A105, F5, F11, F22, F304(L), F316(L), F321, F347 |
|---|---|
| Wedge | Solid or flexible wedge, hard-faced |
| Seat / Trim | 13Cr or Stellite overlay on request |
| Gasket | Spiral wound, graphite filled |
| Packing | Graphite, high temperature |
| Bonnet Type | Bolted bonnet — pressure-seal available on request |
Standards / data basis: API 602 / ASME B16.34
Seawater & Brine Isolation
Read from Wafer Butterfly Valve with Lever Handle (D71X) — D71X · DN50–600 · PN10/16
| Body | Ductile iron QT450, epoxy coated; duplex 2205 / 2507 available on request |
|---|---|
| Disc | SS304 |
| Seat | EPDM resilient |
RO Feed & Booster Pumps
Read from Vertical Multistage Pump (CDL / CDLF) — CDL / CDLF · Q1–150 m³/h
| Wetted Parts | Stainless steel 304 or 316L (CDLF); CDL all-stainless for non-corrosive liquid |
|---|---|
| Shaft Seal | Mechanical seal |
| Connection | DIN flange, threaded flange, compression coupling or clamp, per size |
| Protection | Optional intelligent protector for dry run, phase loss and overload |
| Body | SS304 / SS316 (CDLF) |
Series ranges are for preliminary selection; the final model is selected against the duty point and the printed curve.
What we need to quote
A pump or a lined valve is quoted against the duty point, not off a catalogue page. Send these and the reply is a model with its curve, not a range.
- 01Service temperature and medium — LNG, nitrogen, CO₂, brine or permeate decide the body and packing
- 02Line size, pressure class and the standard you specify (ASME B16.34, EN, or project spec)
- 03For cryogenic service: whether the valve has to be fire-safe, anti-static and certified to BS 6364
- 04For the RO train: flow (m³/h), head (m), recovery and the chloride level the wetted parts see