Home › Products › Low pressure valves › Gate valves › ANSI 150 cast iron
ANSI 150# flange ASME B16.10ANSI 150 cast iron gate valve, 2" to 6"
A rising‑stem gate valve for isolation, with ANSI 150# flange ends, 2" to 6" (DN50 to DN150), in Cast iron ASTM A126 B. Rated 150#, built to ASME B16.10 and tested to API 598. Graphite packed — isolation duty only, never throttling.
The ANSI 150 cast iron gate valve
Isolation duty, ANSI 150# flange ends, built to ASME B16.10.
A rising‑stem gate valve for isolation, with ANSI 150# flange ends, in 2" to 6" (DN50 to DN150). The body is Cast iron ASTM A126 B, rated 150#, designed and manufactured to ASME B16.10 with ends to ASME B16.1 and inspection and testing to API 598.
Fully open, the gate lifts clear of the bore and the valve presents almost no restriction and almost no pressure drop. That is what a gate valve is for. It is not a throttling valve: held part‑open, flow across the partly‑raised gate vibrates it and erodes both gate and seat, and the damage is permanent. To regulate flow, use a globe valve.
- ⚠ Isolation only. Fully open or fully shut — never throttle a gate valve. A throttled gate eventually will not shut off at all.
- ⚠ Cast iron is brittle. It does not tolerate impact, bending load or thermal shock. Support the pipework properly and do not specify it where the line moves or vibrates. For hot or mechanically demanding service use cast steel.
- No working temperature is published for this variant. For any hot service ask us to confirm a figure with the factory, or specify cast steel, which states 425 °C.
- Lowest test pressures in the range — 2.06 MPa body and 1.57 MPa seal against 3.0–3.1 for the steel variants. That is the material, not a defect.
- Tested to 2.06 MPa shell and 1.57 MPa seal, with gas tightness at 0.6 MPa. Proof tests, not working pressures. The figures.
Three angles on the same valve. All photographs of the stocked item, not renders.
Specification
Everything that goes on a purchase order.
| Size range | 2" to 6" (DN50 to DN150) |
| End type | ANSI 150# flange — to ASME B16.1 |
| Body material | Cast iron ASTM A126 B |
| Working pressure | 150# |
| Maximum working temperature | not stated in the published specification |
| Design and manufacture | ASME B16.10 |
| Inspection and test | API 598 |
| Shell or body test | 2.06 MPa |
| Seal test | 1.57 MPa |
| Gas tightness test | 0.6 MPa |
| Stem | Rising stem, handwheel operated, multi‑turn |
| Packing | Graphite |
| Duty | Isolation only — never for throttling. For throttling use globe valves |
| Stock | Held in Malaysia or Singapore |
Bill of materials
All 17 parts, with the manufacturer’s own item numbers.
| No | Part name | Material |
|---|---|---|
| 1 | Body | A126 B Cast Iron |
| 2 | Wedge | A126 B Cast Iron |
| 3 | Stem | A276 SS304 |
| 4 | Bolts | A29 1035 |
| 5 | Nuts | A29 1025 |
| 6 | Gasket | SS304 + Graphite |
| 7 | Bonnet | A126 B Cast Iron |
| 8 | Packing | Flexible Graphite |
| 9 | Pin | A29 1045 |
| 10 | Packing Gland | A276 SS304 |
| 11 | Gland Flange | A126 B Cast Iron |
| 12 | Eye Bolts | A29 1035 |
| 13 | Nuts | A29 1025 |
| 14 | Stem Nut | A276 SUS410 |
| 15 | Cover | A29 1025 |
| 16 | Handwheel | A47 32510 Malleable Iron |
| 17 | Nut | A29 1025 |
- The item numbers are the manufacturer’s, taken from the sectional drawing rather than renumbered 1 to 17. We publish them as printed so a spares order matches the drawing.
- Graphite packing is what allows the temperature rating. A gate valve seats metal to metal and packs the stem with graphite — no PTFE in the pressure boundary, which is why this range goes far past a ball valve.
Sizes and dimensions
6 sizes. Dimensions in millimetres.
Letters follow the manufacturer’s drawing. L is the face‑to‑face length and the figure that decides whether the valve drops into your run; H is the height with the stem risen. Where a letter is ambiguous we have left it exactly as published rather than guess at it.
| Size | Part no | Bore d | Face‑to‑face L | O | Handwheel W | R | Bolts n‑z | Flange thk t | RF height f |
|---|---|---|---|---|---|---|---|---|---|
| 2" | VL-CI-GA-F-150-32 | 50 | 178 | 152 | 120 | 92.1 | 4- 19 | 15.5 | 2 |
| 2 1/2" | VL-CI-GA-F-150-40 | 65 | 190 | 178 | 139 | 104.8 | 4- 19 | 16.6 | 2 |
| 3" | VL-CI-GA-F-150-48 | 80 | 204 | 190 | 150 | 127 | 4- 19 | 18 | 2 |
| 4" | VL-CI-GA-F-150-64 | 100 | 229 | 227 | 190 | 157.2 | 8- 19 | 22.5 | 2 |
| 5" | VL-CI-GA-F-150-80 | 125 | 254 | 254 | 216 | – | 8- 22 | 23.9 | 2 |
| 6" | VL-CI-GA-F-150-96 | 150 | 270 | 279 | 241.5 | – | 8- 22 | 25.4 | 2 |
- ⚠ Allow headroom above the height figure. This is a rising stem valve — the stem and handwheel travel up as it opens, and you need clearance above that plus room to turn the wheel.
- Measure the gap in the run against L, and on a replacement measure the valve coming out rather than trusting a drawing.
Test pressures
Factory proof tests. Not working pressures.
| Normal Pressure | 150# |
| Hydraulic Body Test | 2.06 MPa |
| Seal Test | 1.57 MPa |
| Hermetical Seal Test | 0.6 MPa |
- ⚠ Do not design to these. They are proof tests well above the working rating — the body or shell test proves the casting or forging, the seal test proves the gate against its seat.
- Inspected and tested to API 598, the standard common to all ten gate valve variants, which is what makes these figures comparable across the range. All ten.
Not sure this is the right one?
End type first, then material, then pressure.
Choose this one when
- Your pipework is ANSI 150# flange — checked, not assumed.
- The duty suits Cast iron ASTM A126 B.
- 150# covers the working pressure.
- Your specification names ASME B16.10.
- You need to isolate, not regulate.
Choose something else when
- You need to throttle → globe valves. A gate valve will be damaged doing it.
- You need fast, frequent isolation → ball valves, a quarter turn instead of many.
- Your pipework is a different end type or flange standard → pick by end type.
- You need more pressure at small bore → the threaded or socket weld forged valves at 800 PSI.
- You need corrosion resistance → an SS316 variant.
- You need larger than 6" → butterfly valves.
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.
Questions we get asked
The ones that come up on the phone.
What is the ANSI 150 cast iron gate valve?
A rising‑stem gate valve for isolation duty with ANSI 150# flange ends, 2" to 6" (DN50 to DN150), in Cast iron ASTM A126 B, rated 150#. Designed and manufactured to ASME B16.10, ends to ASME B16.1, inspected and tested to API 598. Tested at 2.06 MPa shell and 1.57 MPa seal.
Can I use it to control flow?
No. It is an isolation valve — fully open or fully shut. Held part‑open, flow across the partly‑raised gate makes it vibrate and erodes both the gate and its seat, and that damage is permanent: a throttled gate valve eventually will not shut off at all. To regulate flow use a globe valve.
What temperature will it take?
No figure is published for this variant. The other flanged gate valves state 425 °C and the JIS 10K cast iron version states 429 °C, but we do not carry a figure across from a different valve. For hot service ask us to confirm, or specify cast steel, where the rating is unambiguous.
Will it fit my pipework?
Only if your pipework is ANSI 150# flange. ANSI 150 and JIS 10K are rated similarly and will not bolt to one another — the bolt circles differ. Count the bolt holes and measure the bolt circle on the mating flange, or send us a photo. You also need the face‑to‑face L to match the gap in the run.
What is it made of?
Cast iron ASTM A126 B. The full numbered parts list is on this page, with the manufacturer’s own item numbers preserved so a spares order matches the drawing. ⚠ Cast iron is brittle — no impact, bending load or thermal shock, and it must not carry pipe load.
Why is it rated 150#?
The ANSI 150# flange rating sets it, not the body. A flanged Class 150 or 10K joint is the limiting element — which is why the threaded and socket weld valves in the same range reach 800 PSI from a similar body.
Do I need extra height above the valve?
Yes. This is a rising stem valve — the stem and handwheel travel up as it opens. Allow clearance above the published height plus room to turn the wheel. It is the dimension most often forgotten when replacing a valve in a tight space.
Gate valve or ball valve?
Temperature and speed decide it. Gate valves in this range work to 425 °C because they seal metal‑to‑metal with graphite packing; the PTFE‑seated ball valves stop at 150 °C. But a ball valve is a quarter turn and a gate valve is many turns. For hot service, gate. For fast or frequent isolation, ball.
What sizes do you hold in stock?
2" to 6" (DN50 to DN150), held in Malaysia or Singapore. Send the size and the end type and we will confirm availability and a landed price — transport, currency, duties and taxes already inside the figure.
Catalogue
Direct PDF download — no form, no email address.
Send the end type, the size and the temperature
We will confirm the ANSI 150# flange actually matches your pipework, check the temperature against this variant, tell you if a globe valve is the right tool instead, and quote a landed price. Stock in Malaysia and Singapore.