3-Piece Flanged Cast Steel Ball Valves
A three piece flanged cast ball valve is a full bore ball valve with a ductile or cast iron body, a removable centre section and flanged ends. It is used as the shut-off valve on large bore main lines for hot water, superheated water, compressed air and other industrial media.
Products are offered from DN15 to DN300 in PN16, PN25 and PN40 pressure classes. On models with an ISO 5211 compliant top flange an actuator mounts directly.
Main Applications
- Main lines in heating and cooling plants
- Superheated water and hot water distribution lines
- Auxiliary water and air lines in food plants
- Shipbuilding and paper mill installations
- Compressed air and industrial gas headers
- Actuated automatic shut-off stations
Technical Data
| Connection | Flanged |
|---|---|
| Bore range | DN15 – DN200 (PN16 type) · DN15 – DN300 (general purpose) |
| Pressure class | PN16 / PN25 / PN40 (depending on model) |
| Max. pressure (PN16 type) | 16 bar |
| Temperature | −10 °C … +180 °C (PN16 type) · up to +200 °C (general purpose, manufacturer data) |
| Body | Ductile iron (cast iron option on general purpose) |
| Ball | Stainless steel |
| Ball seat | R-PTFE (15%) |
| Top flange | ISO 5211, actuator ready |
| Operating torque | DN50: 25 N·m · DN100: 120 N·m · DN200: 770 N·m |
| Face-to-face length | DN15: 130 mm · DN25: 160 mm · DN50: 230 mm |
| Standards (general purpose) | TS 3148, PED 2014/68/EU |
Material Options
| Part | PN16 · ductile iron | PN40 · ductile iron (general purpose) |
|---|---|---|
| Body | Ductile iron GGG-40.3 | Cast iron / ductile iron |
| Cover | Grey cast iron GG25 | Depending on model |
| Ball | Stainless steel | Solid stainless steel |
| Ball seat | R-PTFE (15%) | Depending on model |
| Body gasket | PTFE | Depending on model |
| Stem | Stainless steel | Depending on model |
| Gland packing | PTFE | Depending on model |
| Bolts, nuts, washers | Carbon steel | Depending on model |
| Spring washer | SS301 | Depending on model |
| Handle | Carbon steel, plastic coated | Depending on model |
The PN16 column is from the manufacturer part list of a three piece full bore valve; the PN40 column is from the manufacturer page for general purpose ball valves. As the PN16 type datasheet also lists the body as grey cast iron GG25 in one place, this is confirmed before ordering.
Advantages
Full Bore on Large Sizes
- Full bore options are available up to DN300.
- Pressure loss stays equal to the pipeline.
Removable Centre
- The centre body is removed by undoing the bolts.
- Seals are changed without disturbing the flange joints.
Actuator Ready
- An ISO 5211 top flange is standard.
- The torque table simplifies actuator selection.
Cast Strength
- The ductile iron body withstands shock and vibration.
- The stainless ball gives long life against wear.
Construction and Design Features
- The body consists of two flanged end pieces and a centre body.
- The ball runs between R-PTFE seats; the stem is stainless steel.
- Stem sealing is protected by PTFE packing and a spring washer.
- The top flange is machined to ISO 5211 dimensions.
- On general purpose models from DN250 the ball is bottom supported.
Send us the DN, PN, medium and type of operation; we will select a handle, gearbox or actuator matching the torque together.
How to Choose?
- Define bore and pressure classFor lines above DN200 or requiring PN40, look at the general purpose series.
- Check the temperatureOn lines above 180 °C choose the model with the higher temperature limit.
- Allow for torqueManual operation becomes difficult above DN150; consider a gearbox or actuator.
- Match the flange drillingConfirm the drilling that matches the PN class of the mating flange.
- Define document needsOn pressure equipment projects request the PED conformity certificate in the quotation.
Complementary Products
Why ORFA?
Other Flanged Ball Valves
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Details →Our 3-Piece Flanged Cast Steel Ball Valves
ORFA supplies 3-piece flanged cast steel ball valves in a range of pressure classes, sizes and connection types to suit your application. Descriptions, technical specifications, materials and dimension tables are available on each detail page.
3-Piece Flanged Cast Iron Ball Valve
3-piece flanged cast iron ball valve: full bore, GG-25 / GGG40 body, stainless steel ball, PTFE seated, DN15–DN300, PN16 / PN40, max +180…+200 °C.
Details →Reducing Flanged Ductile Iron Ball Valve
3-piece flanged ductile iron ball valve with reducing bore: ductile iron body, stainless steel sphere, DN20–DN300, PN16/PN40. Compact, economical alternative to full bore.
Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.