ANSI 150 cast iron globe valve, 2" to 6"

A rising‑stem globe valve for throttling and isolation, in 2" to 6" (DN50 to DN150), with ANSI 150# flange ends and a body in Cast iron ASTM A126 B. Rated 150#, designed and manufactured to ASME B16.10, inspected and tested to API 598.

Inside, flow turns up through a seat opening, past a disc that lifts squarely off the seat, and turns down again. The stem moves the disc towards or away from the seat, so the gap changes smoothly with stem position and a flow can be set and held. That is the job a gate valve cannot do — a gate parked part open vibrates and wears its seat. The cost is pressure drop even fully open, because the path turns twice. Globe against gate.

• ⚠ Cast iron is brittle. It has no useful ductility, so it will crack rather than bend under a bending load or a sharp blow. The valve must be independently supported, never used to pull a misaligned flange together, and never struck. On anything that moves, vibrates or gets hit, use cast steel.
• The 6" row prints 241.5 mm for both flange OD and bolt circle, as the catalogue has it; ASME B16.5 Class 150 at 6" is 279.4 mm OD on a 241.3 mm bolt circle. We confirm the 6" flange dimensions on enquiry.
• Rated 429 °C, as published. The JIS 10K version of the same cast iron valve is rated 230 °C — each figure governs its own valve. The whole set of figures.
• The two size bands are not the same valve inside. The 2"–4" band lists a plain A126 B seat and disc; the 5"–6" band lists A126 B + SS304, a stainless facing on the seating surfaces. The larger band is better protected where it matters.
• Nothing in the pressure boundary is stainless. Body, seat, disc, bonnet and gland flange are all cast iron; the stem and gland are 410 stainless. On corrosive duty use SS316.

Three angles on the same valve. Photographs of the stocked item, not renders.

2" to 4" (DN50 to DN100) — 19 parts

5" and 6" (DN125 to DN150) — 19 parts

The manufacturer’s sectional drawings, one for each size band. Callout numbers correspond to the matching parts list.

• The item numbers are the manufacturer’s. They are the callout numbers from the sectional drawing, which is why a number can repeat a part name at a different position. We have left them exactly as published so a spares order matches the drawing.
• The seating surfaces are what wear. On a valve that runs part open, flow through the gap is fast, and the disc face and seat take that. They are the parts to ask about first.
• Everything here is published, not on request. If you need to know what touches your fluid, the whole list is above.

2" to 4" (DN50 to DN100)

5" and 6" (DN125 to DN150)

• ⚠ Do not design to these figures. They are manufacturing proof tests well above the working rating — the shell test proves the body, the seal test proves the disc against its seat. The valve is not intended to operate there.
• Gas tightness is 0.6 MPa, the same figure across all ten variants in this range. It is the one number that does not move with class, size or material.
• The temperature ceiling is the material, not a seat insert. A globe valve seals metal to metal and packs the stem with graphite, which is why the steel variants here reach 425 °C where a PTFE‑seated ball valve stops at 150. All ten compared.

All ten, side by side: the comparison table. Other variants: ANSI 150 cast steel · ANSI 150 forged steel · ANSI 150 SS316 · JIS 10K cast iron · JIS 10K SS316 · Threaded forged steel · Threaded SS316 200 PSI · Threaded SS316 800 PSI · Weld end forged steel.

All globe valves · gate valves for straight‑through isolation · ball valves for quarter‑turn · flange end ball valves · swing check valves · Y‑strainers to keep grit off the seat · needle valves for fine control at pressure · all low pressure valves.