Isolation ball valves for lines that already use SAE flange porting: one quarter turn, and the joint seals on an O-ring in the flange face. Used on manifolds, power packs and heavy plant where the pipework cannot be turned to tighten a thread.
State flange pattern (3000 or 6000 psi), size, bolt type, fluid & temperature — quotes within 2 working hours.
| Flange patterns | ISO 6162-1 (3000 psi) · ISO 6162-2 (6000 psi) |
|---|---|
| Series | BKH/BKHP-SAE · MKHP-SAE · KH-SAE |
| Range | DN13–DN80 — 1/2″ to 3″ |
| Body pressure | 315–420 bar — by type & size |
| Body | Steel or stainless SS316 |
| Seats | POM across all ranges |
| Seals | NBR or FPM (Viton) |
| Bolts | M8 · M10 · M12 or 5/16″ · 3/8″ · 7/16″ |
Pressure by type and Kv/Cv flow capacity by size are on this page, as printed in the catalogue.
| At a glance | BKH/BKHP | MKHP | KH |
|---|---|---|---|
| Range | DN13–25 | DN32–50 | DN15–80 |
| Inches | 1/2–1″ | 1¼–2″ | 1/2–3″ |
| Stem | Steel | Steel | Duplex |
| Port | Standard | Standard | Full port |
| Type | Bore | Flange pattern | Valve body PN |
|---|---|---|---|
| BKH-DN13-SAE210 | 13 | ISO 6162-1 | 350 bar |
| BKH-DN20-SAE210 | 20 | ISO 6162-1 | 350 bar |
| BKH-DN25-SAE210 | 25 | ISO 6162-1 | 315 bar |
| BKH-DN13-SAE420 | 13 | ISO 6162-2 | 420 bar |
| BKH-DN20-SAE420 | 20 | ISO 6162-2 | 420 bar |
| BKH-DN25-SAE420 | 25 | ISO 6162-2 | 315 bar |
| BKHP-DN25-SAE420 | 25 | ISO 6162-2 | 420 bar |
⚠ The flange pattern and the body pressure are two different things. Look at DN25: the pattern is SAE420 (6000 psi interface) but the body is rated 315 bar. For a full 420 bar at DN25 the part is the reinforced BKHP-DN25-SAE420. Never read the number on the flange pattern as the valve's rating.
Kv & Cv flow capacity
| Size | Kv (m³/h) | Cv (US gal/min) |
|---|---|---|
| 1/2″ | 19.4 | 22.6 |
| 3/4″ | 45.6 | 53.0 |
| 1″ | 71.5 | 83.1 |
| 1¼″ | 105 | 122.1 |
| 1½″ | 170 | 197.7 |
| 2″ | 275 | 319.8 |
| 2½″ | 507 | 589.5 |
| 3″ | 905 | 1052.3 |
Capacity climbs far faster than size: from 1/2″ to 3″ the bore grows six times but Kv grows nearly 47 times. When a valve becomes the restriction in a line it is usually because the size was dropped one step — not because of the pattern.
| Pattern | What it means on site |
|---|---|
| ISO 6162-1 — 3000 psi interface (±210 bar) | The commonest SAE pattern on medium-pressure hydraulic lines. Smaller bolts on a tighter spacing. |
| ISO 6162-2 — 6000 psi interface (±420 bar) | For high pressure: bigger bolts, different hole spacing, thicker flange face. It cannot be bolted to a 3000 psi pattern even at the same nominal size. |
Bolt options
| Metric | UNC |
|---|---|
| M8 | 5/16″ |
| M10 | 3/8″ |
| M12 | 7/16″ |
State metric or UNC on the PO. This is the commonest reason an installation stops on site: the valve and flange are right, the bolts do not fit.
| Code | Body / ball | Stem | O-rings | Temperature |
|---|---|---|---|---|
| 112A | Steel | Steel | NBR | −20…+100 °C |
| 112A (variant) | Steel | Steel | FPM | −20…+100 °C |
| 442A | SS316 | SS316 | NBR | −30…+100 °C |
| 282A (KH) | Steel | Duplex | NBR | −10…+100 °C |
| 282A (variant) | Steel | Duplex | FPM | −10…+100 °C |
POM seats across all ranges — what changes is the O-ring. And watch the bottom of the range: 282A starts at −10 °C, not −20 °C like 112A. For cold duty the code decides, not the material family. The FPM seal codes are listed alongside the NBR ones in the catalogue — we confirm the exact code on the quote.
| Component | Per joint | Per valve (2 sides) |
|---|---|---|
| Ball valve with SAE flange adapter | — | 1 |
| SAE O-ring side flange | 1 | 2 |
| Allen cap screws | 4 | 8 |
| Spring washers | 1 | 8 |
| O-ring seals | 1 | 2 |
The spring washer count follows the bolt count in the complete assembly — as printed in the catalogue. If you order the valve alone without its flange and bolt set, the line cannot be connected: specify the complete set on the PO.
3000 psi or 6000 psi, and metric or UNC — before the valve leaves the box.
Always new O-rings; check the sealing faces for scoring and dirt. The seal lives on that face.
Evenly and alternately — not one bolt fully home before moving on.
Full open, full shut, and check the lever fouls nothing.
So vibration cannot operate the valve on its own — part-open is the condition that wire-draws a seat.
Dimensions, bolt-hole spacings and part numbers are in the catalogues, as printed; stock and price are not — send the list and we confirm both. The MHA range continues above the stocked series (the catalogue lists BKH/BKHP versions to 800 bar) on request; larger bores are quoted with a lead time.
SAE flange porting is already the standard here — the valve drops in without reworking the block.
A joint that survives vibration and can be broken without turning the pipework.
Isolating a line at full working pressure, with enough Kv not to restrict it.
SS316 bodies (442A), or the duplex stem on the KH series.
Both are SAE flange interface patterns. ISO 6162-1 = the 3000 psi interface (±210 bar); ISO 6162-2 = the 6000 psi interface (±420 bar). At the same nominal size the 6000 psi pattern uses larger bolts on a different spacing — the two do not interchange.
Because the valve body is the limit, not the flange. On a BKH-DN25-SAE420 the flange pattern is the 6000 psi interface but the body is rated 315 bar. For a full 420 bar at DN25, the part is the reinforced BKHP-DN25-SAE420.
Per joint: 1 SAE O-ring side flange, 4 Allen cap screws, 1 spring washer, 1 O-ring. A valve has two sides — so a fully fitted valve takes 8 screws, 8 spring washers and 2 O-rings, plus its own SAE flange adapter.
Metric M8, M10, M12 or UNC 5/16″, 3/8″, 7/16″. State which — the wrong bolt set stops the installation on site.
Flow capacity figures: Kv in m³/h, Cv in US gal/min. They climb steeply with size — 19.4 Kv at 1/2″ to 905 Kv at 3″. Use them to check the valve will not become the restriction in your line.
Size and construction. BKH/BKHP-SAE: DN13–DN25 (1/2–1″). MKHP-SAE: DN32–DN50 (1¼–2″). KH-SAE: the widest range DN15–DN80 (1/2–3″), full port, with a duplex stem.
Duplex is a two-phase stainless — higher strength and better stress-corrosion resistance than plain steel. The stem is the part that takes repeated torque. Note: the 282A code temperature range starts at −10 °C, not −20.
POM (polyoxymethylene) across all ranges. What changes is the O-ring: NBR standard, FPM (Viton) for demanding temperature or fluid. What limits fluid compatibility is the O-ring, not the metal — name your fluid and we pick the compound.
Yes — manual, electric or pneumatic, plus locking devices, position switches and a detent, all in the catalogue. State medium, temperature and pressure so it is sized correctly.
So vibration cannot operate the valve on its own. On a high-pressure line a lever that creeps a little leaves the valve part-open — and part-open is the condition that wire-draws the seat.
Yes — the MHA range continues above the series we stock; the catalogue lists BKH/BKHP versions to 800 bar, on request. The tables here are the stocked series, as printed. Larger bores are quoted with a lead time.
Yes — we hold this range in our regional warehouses in Singapore and Malaysia, out within 24 hours of your PO for the BKH range; quotes back within 2 working hours.
Related: threaded hydraulic ball valves · ISO 6164 ball valves · SAE flange check valves · SAE flanges · about the MHA Zentgraf brand · all high pressure valves · baca halaman ini dalam Bahasa Indonesia